Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2018	Apr. 23, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Trading Symbol	LOGM
Entity Registrant Name	LogMeIn, Inc.
Entity Central Index Key	0001420302
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		52,212,074

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 365,180	$ 252,402
Accounts receivable (net of allowance of $2,031 and $3,057 as of December 31, 2017 and March 31, 2018, respectively)	84,369	93,949
Prepaid expenses and other current assets	56,735	52,473
Total current assets	506,284	398,824
Property and equipment, net	90,826	92,154
Restricted cash, net of current portion	1,844	1,795
Intangibles, net	1,099,795	1,149,597
Goodwill	2,194,554	2,208,725
Other assets	33,810	6,483
Deferred tax assets	256	530
Total assets	3,927,369	3,858,108
Current liabilities:
Accounts payable	30,675	22,232
Accrued liabilities	109,672	82,426
Deferred revenue, current portion	380,144	340,570
Total current liabilities	520,491	445,228
Long-term debt	0	0
Deferred revenue, net of current portion	4,777	6,735
Deferred tax liabilities	218,507	221,407
Other long-term liabilities	23,232	20,997
Total liabilities	767,007	694,367
Commitments and contingencies (Note 11)
Preferred stock, $0.01 par value - 5,000 shares authorized, 0 shares outstanding as of December 31, 2017 and March 31, 2018
Equity:
Common stock, $0.01 par value - 150,000 shares authorized; 56,043 and 56,230 shares issued; and 52,564 and 52,347 outstanding as of December 31, 2017 and March 31, 2018, respectively	562	560
Additional paid-in capital	3,281,688	3,276,891
Retained Earnings	85,849	50,445
Accumulated other comprehensive income	21,027	15,570
Treasury stock, at cost - 3,479 and 3,883 shares as of December 31, 2017 and March 31, 2018, respectively	(228,764)	(179,725)
Total equity	3,160,362	3,163,741
Total liabilities and equity	$ 3,927,369	$ 3,858,108

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 3,057	$ 2,031
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	56,230,000	56,043,000
Common stock, shares outstanding	52,347,000	52,564,000
Treasury stock, shares	3,883,000	3,479,000

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Revenue	$ 279,217	$ 187,458
Cost of revenue	62,942	38,939
Gross profit	216,275	148,519
Operating expenses
Research and development	43,116	33,122
Sales and marketing	88,215	75,768
General and administrative	35,443	49,391
Gain on disposition of assets	(33,910)
Amortization of acquired intangibles	41,083	24,420
Total operating expenses	173,947	182,701
Income (loss) from operations	42,328	(34,182)
Interest income	673	146
Interest expense	(326)	(449)
Other income (expense), net	(240)	50
Income (loss) before income taxes	42,435	(34,435)
(Provision for) benefit from income taxes	(12,723)	15,871
Net income (loss)	$ 29,712	$ (18,564)
Net income (loss) per share:
Basic	$ 0.57	$ (0.43)
Diluted	$ 0.56	$ (0.43)
Weighted average shares outstanding:
Basic	52,457	43,570
Diluted	53,415	43,570
Cash dividend declared per common share	$ 0.30	$ 0.75

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 29,712	$ (18,564)
Other comprehensive gain (loss):
Net unrealized loss on marketable securities, (net of tax benefit of $3 for the three months ended March 31, 2017)		(5)
Net translation gains (losses)	5,457	(96)
Total other comprehensive gain (loss)	5,457	(101)
Comprehensive income (loss)	$ 35,169	$ (18,665)

Condensed Consolidated Statements of Comprehensive Income (Parenthetical) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)
Statement of Comprehensive Income [Abstract]
Net unrealized gains on marketable securities, tax provision (benefit)	$ (3)

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities
Net income (loss)	$ 29,712	$ (18,564)
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation	15,966	14,194
Depreciation and amortization	71,290	40,284
Gain on disposition of assets, net of transaction costs	(36,281)
Benefit from deferred income taxes	(9,353)	(16,456)
Other, net	464	239
Changes in assets and liabilities, excluding effect of acquisitions and dispositions:
Accounts receivable	9,820	3,127
Prepaid expenses and other current assets	4,767	(6,898)
Other assets	(2,767)	88
Accounts payable	9,646	3,887
Accrued liabilities	19,812	40,536
Deferred revenue	38,685	44,329
Other long-term liabilities	2,212	1,104
Net cash provided by operating activities	153,973	105,870
Cash flows from investing activities
Proceeds from sale or disposal or maturity of marketable securities		26,253
Purchases of property and equipment	(7,249)	(3,694)
Intangible asset additions	(7,096)	(6,031)
Cash paid for acquisition, net of cash acquired		24,215
Restricted cash acquired through acquisitions		917
Proceeds from disposition of assets	42,394
Net cash provided by investing activities	28,049	41,660
Cash flows from financing activities
Proceeds from issuance of common stock upon option exercises	63	4,485
Payments of withholding taxes in connection with restricted stock unit vesting	(9,230)	(7,621)
Payment of debt issuance costs		(1,793)
Dividends paid on common stock	(15,738)	(12,780)
Purchase of treasury stock	(46,901)	(7,465)
Net cash used in financing activities	(71,806)	(25,174)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	2,657	2,551
Net increase in cash, cash equivalents and restricted cash	112,873	124,907
Cash, cash equivalents and restricted cash, beginning of period	254,209	143,335
Cash, cash equivalents and restricted cash, end of period	367,082	268,242
Supplemental disclosure of cash flow information
Cash paid for interest		105
Cash paid for income taxes	4,738	1,043
Noncash investing and financing activities
GoTo Business purchase consideration paid in equity		2,921,179
Purchases of property and equipment included in accounts payable and accrued liabilities	2,657	2,168
Withholding taxes in connection with restricted stock unit vesting in accrued liabilities	1,999	$ 3,060
Purchases of treasury stock included in accrued liabilities	2,137
Purchases of intangible assets included in accrued liabilities	$ 2,500

Nature of the Business	3 Months Ended
Nature of the Business	Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of the Business	1. Nature of the Business LogMeIn, Inc., which we refer to herein as LogMeIn or the Company, provides a portfolio of cloud-based communication and collaboration, identity and access, and customer engagement and support solutions designed to simplify how people connect with each other and the world around them to drive meaningful interactions, deepen relationships, and create better outcomes for individuals and businesses. The Company is headquartered in Boston, Massachusetts with additional locations in North America, South America, Europe, Asia and Australia. On January 31, 2017, the Company completed a merger with a wholly-owned subsidiary of Citrix Systems, Inc., or Citrix, pursuant to which the Company combined with Citrix’s GoTo family of service offerings known as the GoTo Business in a Reverse Morris Trust transaction which we refer to herein as the Merger. For additional information regarding the Merger, see Note 4 below.

Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

2. Summary of Significant Accounting Policies

Principles of Consolidation — The accompanying condensed consolidated financial statements include the results of operations of the Company and its wholly-owned subsidiaries. All intercompany transactions and balances have been eliminated in consolidation. The Company has prepared the accompanying condensed consolidated financial statements in conformity with accounting principles generally accepted in the United States of America, or GAAP.

Unaudited Interim Condensed Consolidated Financial Statements — The accompanying condensed consolidated financial statements and the related interim information contained within the notes to the condensed consolidated financial statements are unaudited and have been prepared in accordance with GAAP and applicable rules and regulations of the Securities and Exchange Commission for interim financial information. Accordingly, they do not include all of the information and notes required by GAAP for complete financial statements. The accompanying unaudited condensed consolidated financial statements should be read along with the Company’s audited financial statements included in the Company’s Annual Report on Form 10-K, filed with the Securities and Exchange Commission on February 20, 2018. The unaudited interim condensed consolidated financial statements have been prepared on the same basis as the audited financial statements and in the opinion of management, reflect all adjustments, consisting of normal and recurring adjustments, necessary for the fair presentation of the Company’s financial position, results of operations and cash flows for the interim periods presented. The results for the interim periods presented are not necessarily indicative of future results. The Company considers events or transactions that occur after the balance sheet date but before the financial statements are issued to provide additional evidence relative to certain estimates or to identify matters that require additional disclosure.

Use of Estimates — The preparation of condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. By their nature, estimates are subject to an inherent degree of uncertainty. Actual results could differ from those estimates.

Recently Adopted Accounting Pronouncements

On January 1, 2018, the Company adopted ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash (a consensus of the FASB’s EITF), referred to herein as ASU 2016-18, which requires restricted cash to be included with cash and cash equivalents when reconciling the beginning and ending amounts on the statement of cash flows. The adoption of ASU 2016-18 impacted the presentation of the condensed consolidated statement of cash flows with the inclusion of restricted cash for each of the presented periods.

Cash and cash equivalents subject to contractual restrictions and not readily available for use are classified as restricted cash. The Company’s restricted cash balances are primarily made up of cash posted as collateral for its worldwide facility leases. The following table provides a reconciliation of cash, cash equivalents and restricted cash as reported in the condensed consolidated balance sheet as of December 31, 2015, 2016 and 2017 and March 31, 2017 and 2018, to the total of the amounts reported in the condensed consolidated statement of cash flows included herein (in thousands):


	As of December 31,						As of March 31,
	2015		2016		2017		2017		2018
Cash and cash equivalents	$	123,143	$	140,756	$	252,402	$	266,723	$	365,180
Restricted cash, current, included in prepaid expenses and other current assets		—		98		12		151		58
Restricted cash, net of current portion		2,468		2,481		1,795		1,368		1,844

Cash, cash equivalents and restricted cash	$	125,611	$	143,335	$	254,209	$	268,242	$	367,082

In May 2014, the Financial Accounting Standards Board, or FASB, issued ASU 2014-09, Revenue from Contracts with Customers, and has since issued several additional amendments thereto (collectively referred to herein as ASC 606) which became effective for the Company on January 1, 2018. ASC 606 outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes Accounting Standards Codification Topic 605, Revenue Recognition, or ASC 605, including industry-specific guidance. The new standard requires entities to apportion consideration from contracts to performance obligations on a relative standalone selling price basis, based on a five-step model. Under ASC 606, revenue is recognized when a customer obtains control of a promised good or service and is recognized in an amount that reflects the consideration that the entity expects to receive in exchange for the good or service. In addition, ASC 606 also includes subtopic ASC 340-40, Other Assets and Deferred Costs- Contracts with Customers, referred to herein as ASC 340-40, which provides guidance on accounting for certain revenue related costs including costs associated with obtaining and fulfilling a contract, discussed further below.

Revenue recognition from the Company’s primary revenue streams remained substantially unchanged following adoption of ASC 606 and therefore did not have a material impact on its revenues. The Company also considered the impact of ASC 606 subtopic ASC 340-40. Prior to the adoption of ASC 606, the Company expensed commission costs and related fringe benefits as incurred. Under ASC 340-40, the Company is required to capitalize and amortize incremental costs of obtaining a contract, such as sales commissions and related fringe benefits, over the period of benefit, which the Company has calculated to be three years. Incremental costs of obtaining a contract are recognized as an asset if the costs are expected to be recovered. The period of benefit was determined based on an average customer contract term, technology changes, and the company’s ability to retain customers. Sales commissions for renewal contracts are deferred and amortized on a straight-line basis over the related contractual renewal period. Amortization expense is included in sales and marketing expense on the condensed consolidated statements of operations.

On January 1, 2018, the Company adopted ASC 606 using the modified retrospective transition method which resulted in an adjustment to retained earnings for the cumulative effect of applying the standard to all contracts not completed as of the adoption date. Upon adoption, prepaid expenses and other current assets increased by $10.7 million due to the capitalization of the current portion of sales commissions and other assets increased by $17.3 million due to the capitalization of the noncurrent portion of sales commissions. Deferred tax liabilities increased by $6.6 million due to temporary differences between the accounting and tax carrying values of the capitalized commissions. Retained earnings increased by $21.4 million as a net result of these adjustments. The comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods.

The Company has elected the use of practical expedients in its adoption of the new standard, which includes continuing to record revenue reported net of applicable taxes imposed on the related transaction and the application of the standard to all contracts not completed as of the adoption date.

The following tables summarize the impact of adopting ASC 606 on the Company’s condensed consolidated financial statements during the three months ended and as of March 31, 2018 (in thousands):


	As of March 31, 2018
	As Reported		Adjustments			Balance Without Adoption of ASC 606
Condensed Consolidated Balance Sheet
Assets
Prepaid expenses and other current assets	$	56,735	$	(14,051	)	$	42,684
Other assets		33,810		(20,003	)		13,807
Liabilities
Deferred tax liabilities	$	218,507	$	(7,955	)	$	210,552
Equity
Retained earnings	$	85,849	$	(26,098	)	$	59,751


	Three Months Ended March 31, 2018
	As Reported			Adjustments			Balance Without Adoption of ASC 606
Condensed Consolidated Statement of Operations
Sales and marketing	$	88,215		$	5,967		$	94,182
(Provision for) benefit from income taxes	$	(12,723	)	$	1,391		$	(11,332	)
Net income (loss)	$	29,712		$	(4,576	)	$	25,136
Net income (loss) per share
Basic	$	0.57		$	(0.09	)	$	0.48
Diluted	$	0.56		$	(0.09	)	$	0.47

	Three Months Ended March 31, 2018
	As Reported			Adjustments			Balance Without Adoption of ASC 606
Condensed Consolidated Statement of Cash Flows
Cash flows from operating activities
Net income	$	29,712		$	(4,576	)	$	25,136
Benefit from deferred income taxes		(9,353	)		(1,391	)		(10,744	)
Prepaid expenses and other current assets		4,767			3,362			8,129
Other assets		(2,767	)		2,605			(162	)
Net cash provided by operating activities		153,973			—			153,973

Costs to Obtain and Fulfill a Contract — The Company’s incremental costs of obtaining a contract consist of sales commissions and their related fringe benefits. Sales commissions and fringe benefits paid on renewals are not commensurate with sales commissions paid on the initial contract, but they are commensurate with each other. Sales commissions and fringe benefits are deferred and amortized on a straight-line basis over the period of benefit, which the Company has estimated to be three years, for initial contracts and are amortized over the renewal period for renewal contracts, typically one year. The period of benefit was determined based on an average customer contract term, expected contract renewals, changes in technology and the Company’s ability to retain customers. Deferred commissions are classified as current or noncurrent assets based on the timing the expense will be recognized. The current and noncurrent portions of deferred commissions are included in prepaid expenses and other current assets and other assets, respectively, in the Company’s condensed consolidated balance sheets. As of March 31, 2018, the Company had $14.1 million of current deferred commissions and $20.0 million of noncurrent deferred commissions. Commissions expense is primarily included in sales and marketing expense on the condensed consolidated statements of operations. The Company had amortization expense of $3.3 million related to deferred commissions during the three months ended March 31, 2018. Other costs incurred to fulfill contracts have been immaterial to date.

Revenue Recognition — The Company derives its revenue primarily from subscription fees for its premium subscription software services and, to a lesser extent, usage fees from audio services. Revenue is reported net of applicable sales and use tax, value-added tax and other transaction taxes imposed on the related transaction including mandatory government charges that are passed through to the Company’s customers. Revenue is recognized when control of these services is transferred to the Company’s customers, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those services.

The Company determines revenue recognition through the following five steps:

•

Identification of the contract, or contracts, with a customer

•

Identification of the performance obligations in the contract

•

Determination of the transaction price

•

Allocation of the transaction price to the performance obligations in the contract

•

Recognition of revenue when, or as, performance obligations are satisfied

The Company accounts for a contract when it has approval and commitment from both parties, the rights of the parties are identified, payment terms are identified, the contract has commercial substance and collectability of consideration is probable.

Disaggregated Revenue — The Company disaggregates revenue from contracts with customers by geography and product grouping, as it believes it best depicts how the nature, amount, timing and uncertainty of revenue and cash flows are affected by economic factors.

The Company’s revenue by geography (based on customer address) is as follows (in thousands):


	Three Months Ended March 31,
	2017		2018
Revenues:
United States	$	141,178	$	211,754
United Kingdom		11,496		14,066
International—all other		34,784		53,397

Total revenue	$	187,458	$	279,217

The Company’s revenue by product grouping is as follows (in thousands):


	Three Months Ended March 31,
	2017		2018
Revenues:
Communications and collaboration	$	89,733	$	149,907
Identity and access		60,546		84,670
Customer engagement and support		37,179		44,640

Total revenue	$	187,458	$	279,217

Performance Obligations

Premium Subscription Services — Revenue from the Company’s premium subscription services represent a single promise to provide continuous access (i.e. a stand-ready obligation) to its software solutions and their processing capabilities in the form of a service through one of the Company’s data centers. The Company’s software cannot be run on another entity’s hardware and customers do not have the right to take possession of the software and use it on their own or another entity’s hardware.

As each day of providing access to the software is substantially the same and the customer simultaneously receives and consumes the benefits as access is provided, the Company has determined that its premium subscription services arrangements include a single performance obligation comprised of a series of distinct services. Revenue from the Company’s premium subscription services is recognized over time on a ratable basis over the contract term beginning on the date that our service is made available to the customer. Subscription periods range from monthly to multi-year, with the majority of contracts being one year, billed annually in advance, and non-cancelable.

Audio Services — Revenue from the Company’s audio services represent a single promise to stand-ready to provide access to the Company’s platform. As each day of providing audio services is substantially the same and the customer simultaneously receives and consumes the benefits as access is provided, the Company has determined that its audio services arrangements include a single performance obligation comprised of a series of distinct services. These audio services may include fixed consideration, variable consideration or a combination of the two. Variable consideration in these arrangements is typically a function of the corresponding rate per minute. The Company allocates the variable amount to each distinct service period within the series and recognize revenue as each distinct service period is performed (i.e., recognized as incurred).

Accounts Receivable, Net — Accounts receivable, net, are amounts due from customers where there is an unconditional right to consideration. Unbilled receivables of $5.1 million and $3.0 million are included in this balance at December 31, 2017 and March 31, 2018, respectively. The payment of consideration related to these unbilled receivables is subjected only to the passage of time.

Contract Assets and Contract Liabilities — Contract assets and contract liabilities (deferred revenue) are reported net at the contract level for each reporting period.

Contract Assets — Contract assets primarily relate to unbilled amounts typically resulting from sales contracts when revenue recognized exceeds the amount billed to the customer, and right to payment is not just subject to the passage of time. The contract assets are transferred to accounts receivable when the rights become unconditional. There are no contract assets as of December 31, 2017 and March 31, 2018.

Contract Liabilities (Deferred Revenue) — Deferred revenue primarily consists of billings and payments received in advance of revenue recognition. The Company primarily bills and collects payments from customers for its services in advance on a monthly and annual basis. The Company initially records subscription fees as deferred revenue and then recognizes revenue as performance obligations are satisfied, over the subscription period. Typically, subscriptions automatically renew at the end of the subscription period unless the customer specifically terminates it prior to the end of the period. Deferred revenue to be recognized within the next twelve months is included in current deferred revenue, and the remaining is included in long-term deferred revenue in the condensed consolidated balance sheets.

For the three months ended March 31, 2018, revenue recognized related to deferred revenue at January 1, 2018 was approximately $154 million. Approximately $503 million of revenue is expected to be recognized from remaining performance obligations as of March 31, 2018.

Changes in contract balances for the three months ended March 31, 2018 are as follows (in thousands):


	Deferred Revenue
	Current		Non-Current
Balance as of January 1, 2018	$	340,570	$	6,735
Increase (decrease), net		39,574		(1,958	)

Balance as of March 31, 2018	$	380,144	$	4,777

Concentrations of Credit Risk and Significant Customers — The Company’s principal credit risk relates to its cash, cash equivalents, restricted cash and accounts receivable. Cash, cash equivalents and restricted cash are deposited primarily with financial institutions that management believes to be of high-credit quality. To manage accounts receivable credit risk, the Company regularly evaluates the creditworthiness of its customers and maintains allowances for potential credit losses. To date, losses resulting from uncollected receivables have not exceeded management’s expectations.

For the three months ended March 31, 2017 and 2018, no customer accounted for more than 10% of revenue. As of December 31, 2017 and March 31, 2018, no customer accounted for more than 10% of accounts receivable.

Segment Data — Operating segments are identified as components of an enterprise for which separate discrete financial information is available for evaluation by the chief operating decision-maker or decision-making group when making decisions regarding resource allocation and assessing performance. The Company’s chief operating decision maker is its Chief Executive Officer. The Company, whose management uses consolidated financial information in determining how to allocate resources and assess performance, has determined that it operates in one segment.

Marketable Securities — The Company’s marketable securities are classified as available-for-sale and are carried at fair value with the unrealized gains and losses, net of tax, reported as a component of accumulated other comprehensive loss in equity. Realized gains and losses and declines in value judged to be other than temporary are included as a component of earnings based on the specific identification method. Fair value is determined based on quoted market prices. At March 31, 2017, marketable securities consisted of U.S. government agency securities and corporate bonds that had remaining maturities within two years and have an aggregate amortized cost of $29.4 million and an aggregate fair value of $29.4 million, including $1,000 of unrealized gains and $34,000 of unrealized losses. The Company did not have any marketable securities as of December 31, 2017 or March 31, 2018.

Goodwill — Goodwill is the excess of the acquisition price over the fair value of the tangible and identifiable intangible net assets acquired. The Company does not amortize goodwill but performs an impairment test of goodwill annually or whenever events and circumstances indicate that the carrying amount of goodwill may exceed its fair value. The Company operates as a single operating segment with one reporting unit and consequently evaluates goodwill for impairment based on an evaluation of the fair value of the Company as a whole. As of November 30, 2017, our measurement date, the fair value of the Company as a whole exceeded the carrying amount of the Company. Through March 31, 2018, no events have been identified indicating an impairment.

Long-Lived Assets and Intangible Assets — The Company records intangible assets at their respective estimated fair values at the date of acquisition. Intangible assets are being amortized based upon the pattern in which their economic benefit will be realized, or if this pattern cannot be reliably determined, using the straight-line method over their estimated useful lives, which range up to eleven years.

The Company reviews long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of the assets, including intangible assets, may not be recoverable. When such events occur, the Company compares the carrying amounts of the assets to their undiscounted expected future cash flows. If this comparison indicates that there is impairment, the amount of the impairment is calculated as the difference between the carrying value and fair value. Through March 31, 2018, the Company recorded no material impairments.

Foreign Currency Translation — The functional currency of operations outside the United States of America is deemed to be the currency of the local country, unless it is otherwise determined that the United States dollar would serve as a more appropriate functional currency given the economic operations of the entity. Accordingly, the assets and liabilities of the Company’s foreign subsidiaries are translated into United States dollars using the period-end exchange rate, and income and expense items are translated using the average exchange rate during the period. Cumulative translation adjustments are reflected as a separate component of equity. Foreign currency transaction gains and losses are charged to operations.

Derivative Financial Instruments — The Company’s earnings and cash flows are subject to fluctuations due to changes in foreign currency exchange rates. The Company uses foreign currency forward contracts to manage exposure to fluctuations in foreign exchange rates that arise from receivables and payables denominated in foreign currencies. The Company does not designate foreign currency forward contracts as hedges for accounting purposes, and changes in the fair value of these instruments are recognized immediately in earnings. Because the Company enters into forward contracts only as an economic hedge, any gain or loss on the underlying foreign-denominated balance would be offset by the loss or gain on the forward contract. Gains and losses on forward contracts and foreign denominated receivables and payables are included in net foreign currency gains and losses.

As of December 31, 2017 and March 31, 2018, the Company had outstanding forward contracts with notional amounts equivalent to the following (in thousands):


Currency Hedged	December 31, 2017		March 31, 2018
Euro / Canadian Dollar	$	556	$	654
Euro / U.S. Dollar		4,208		4,961
Euro / British Pound		5,926		5,336
Israeli Shekel / Hungarian Forint		8,008		—

Total	$	18,698	$	10,951

The Company had a net foreign currency gain of $0.1 million for the three months ended March 31, 2017 and a net foreign currency loss of $0.2 million for the three months ended March 31, 2018, respectively, which are included in other income (expense), net in the condensed consolidated statements of operations.

Stock-Based Compensation — The Company values all stock-based compensation, including grants of stock options and restricted stock units, at fair value on the date of grant and recognizes the expense over the requisite service period, which is generally the vesting period of the award, for those awards expected to vest, on a straight-line basis.

Income Taxes — Deferred income taxes are provided for the tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes and operating loss carryforwards and credits using enacted tax rates expected to be in effect in the years in which the differences are expected to reverse. At each balance sheet date, the Company assesses the likelihood that deferred tax assets will be realized and recognizes a valuation allowance if it is more likely than not that some portion of the deferred tax assets will not be realized. This assessment requires judgment as to the likelihood and amounts of future taxable income by tax jurisdiction.

The Company evaluates its uncertain tax positions based on a determination of whether and how much of a tax benefit taken by the Company in its tax filings is more likely than not to be realized. Potential interest and penalties associated with any uncertain tax positions are recorded as a component of income tax expense.

Guarantees and Indemnification Obligations — As permitted under Delaware law, the Company has agreements whereby the Company indemnifies certain of its officers and directors for certain events or occurrences while the officer or director is, or was, serving at the Company’s request in such capacity. The term of the indemnification period is for the officer’s or director’s lifetime. As permitted under Delaware law, the Company also has similar indemnification obligations under its certificate of incorporation and by-laws. The maximum potential amount of future payments the Company could be required to make under these indemnification agreements is unlimited; however, the Company has directors’ and officers’ insurance coverage that the Company believes limits its exposure and enables it to recover a portion of any future amounts paid.

In the ordinary course of business, the Company enters into agreements with certain customers that contractually obligate the Company to provide indemnifications of varying scope and terms with respect to certain matters including, but not limited to, losses arising out of the breach of such agreements, from the services provided by the Company or claims alleging that the Company’s products infringe third-party patents, copyrights, or trademarks. The term of these indemnification obligations is generally perpetual. The maximum potential amount of future payments the Company could be required to make under these indemnification obligations is, in many cases, unlimited. Through March 31, 2018, the Company has not experienced any losses related to these indemnification obligations.

Net Income (Loss) Per Share — Basic net income (loss) per share is computed by dividing net income (loss) by the weighted average number of common shares outstanding for the period. Diluted net income (loss) per share is computed by dividing net income (loss) by the sum of the weighted average number of common shares outstanding during the period and, if dilutive, the weighted average number of potential common shares outstanding from the assumed exercise of stock options and the vesting of restricted stock units. For the three months ended March 31, 2017, the Company incurred a net loss and therefore, the effect of the Company’s outstanding common stock equivalents was not included in the calculation of diluted loss per share as they were anti-dilutive. Accordingly, basic and dilutive net loss per share for the period were identical.

The Company excluded the following options to purchase common shares and restricted stock units from the computation of diluted net loss per share because they had an anti-dilutive impact (in thousands):


	Three Months Ended March 31,
	2017		2018
Options to purchase common shares		234		—
Restricted stock units		1,806		—

Total options and restricted stock units		2,040		—

Basic and diluted net income (loss) per share was calculated as follows (in thousands, except per share data):


	Three months ended March 31,
	2017			2018
Net income (loss)	$	(18,564	)	$	29,712

Basic:
Weighted average common shares outstanding, basic		43,570			52,457

Net income (loss) per share, basic	$	(0.43	)	$	0.57

Diluted:
Weighted average common shares outstanding		43,570			52,457
Add: Common stock equivalents		—			958

Weighted average common shares outstanding, diluted		43,570			53,415

Net income (loss) per share, diluted	$	(0.43	)	$	0.56

Recently Issued Accounting Pronouncements

On February 25, 2016, the FASB issued ASU 2016-02, Leases, or ASU 2016-02, which will require lessees to recognize most leases on their balance sheet as a right-of-use asset and a lease liability. Leases will be classified as either operating or finance, and classification will be based on criteria similar to current lease accounting, but without explicit bright lines. The guidance is effective for annual reporting periods beginning after December 15, 2018 and interim periods within those fiscal years, and early adoption is permitted. Although the Company is currently assessing the impact of adoption of ASU 2016-02 on its consolidated financial statements, the Company currently believes the most significant changes will be related to the recognition of new right-of-use assets and lease liabilities on the Company’s balance sheet for operating leases.

On January 26, 2017, the FASB issued ASU 2017-04, Intangibles—Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment, or ASU 2017-04, which simplifies the accounting for goodwill impairments by eliminating step two from the goodwill impairment test. Instead, if the carrying amount of a reporting unit exceeds its fair value, an impairment loss shall be recognized in an amount equal to that excess, limited to the total amount of goodwill allocated to that reporting unit. ASU 2017-04 also clarifies the requirements for excluding and allocating foreign currency translation adjustments to reporting units related to an entity’s testing of reporting units for goodwill impairment, and that an entity should consider income tax effects from any tax-deductible goodwill on the carrying amount of the reporting unit when measuring the goodwill impairment loss, if applicable. The guidance is effective for annual reporting periods beginning after January 1, 2020 and interim periods within those fiscal years. The Company is currently assessing the potential impact of the adoption of ASU 2017-04 on its condensed consolidated financial statements.

On February 15, 2018, the FASB issued ASU 2018-02, Income Statement—Reporting Comprehensive Income—Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income (Topic 220), or ASU 2018-02, which allows for a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act of 2017, or the U.S. Tax Act. The guidance is effective for annual reporting periods beginning after December 15, 2018 and interim periods within those fiscal years, and early adoption is permitted. The Company is currently assessing the potential impact of adoption of ASU 2018-02 on its condensed consolidated financial statements.

Fair Value of Financial Instruments

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Fair Value of Financial Instruments

3. Fair Value of Financial Instruments

The carrying value of the Company’s financial instruments, including cash equivalents, restricted cash, accounts receivable and accounts payable, approximate their fair values due to their short maturities. The Company’s financial assets and liabilities are measured using inputs from the three levels of the fair value hierarchy. A financial asset or liability’s classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement. The three levels are as follows:

•

Level 1: Unadjusted quoted prices for identical assets or liabilities in active markets accessible by the Company at the measurement date.

•

Level 2: Inputs include quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets and liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability and inputs that are derived principally from or corroborated by observable market data by correlation or other means.

•

Level 3: Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

A financial instrument’s level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement.

Money market funds and time deposits are classified within Level 1 of the fair value hierarchy because they are valued based on quoted market prices in active markets.

Certificates of deposit, commercial paper and certain U.S. government agency securities are classified within Level 2 of the fair value hierarchy. These instruments are valued based on quoted prices in markets that are not active or based on other observable inputs consisting of market yields, reported trades and broker/dealer quotes.

The principal market in which the Company executes foreign currency contracts is the institutional market in an over-the-counter environment with a relatively high level of price transparency. The market participants are usually large financial institutions. The Company’s foreign currency contracts’ valuation inputs are based on quoted prices and quoted pricing intervals from public data sources and do not involve management judgment. These contracts are typically classified within Level 2 of the fair value hierarchy.

The Company’s significant financial assets and liabilities measured at fair value on a recurring basis were as follows (in thousands):


	Fair Value Measurements at December 31, 2017
	Level 1		Level 2		Level 3		Total
Financial assets:
Cash equivalents — money market funds	$	148,120	$	10,000	$	—	$	158,120
Financial liabilities:
Forward contracts ($18.7 million notional amount)		—		29		—		29

	Fair Value Measurements at March 31, 2018
	Level 1		Level 2		Level 3		Total
Financial assets:
Cash equivalents — money market funds	$	230,287	$	—	$	—	$	230,287
Forward contracts ($11.0 million notional amount)		—		34		—		34

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Acquisitions

3 Months Ended

Mar. 31, 2018

Business Combinations [Abstract]

Acquisitions

4. Acquisitions

Acquisition-Related Costs

Acquisition-related costs were $31.9 million and $5.1 million for the three months ended March 31, 2017 and 2018, respectively. Acquisition-related costs are associated with the acquisitions of businesses and intellectual property and include transaction, transition and integration-related charges (including legal, accounting and other professional fees, severance, and retention bonuses) and subsequent adjustments to the Company’s initial estimated amount of contingent consideration associated with acquisitions. Acquisition-related costs for the three months ended March 31, 2017 were primarily related to the Merger and included $17.1 million in transaction, transition and integration-related expenses, $7.9 million in integration-related severance costs and $6.9 million of retention-based bonuses as well as $1.6 million related to the Company’s 2015 and 2016 acquisitions. Acquisition-related costs for the three months ended March 31, 2018 were primarily related to $0.5 million of Merger-related transition and integration-related expenses, $2.1 million in integration-related severance costs as well as $1.5 million of transaction and integration-related expenses for the acquisition of Jive Communications, Inc., which closed on April 3, 2018, and $1.0 million of retention-based bonuses primarily related to the Nanorep acquisition described below.

2017 Acquisitions

Nanorep Technologies Ltd.

On July 31, 2017, the Company, through its wholly-owned Hungarian subsidiary, acquired all of the outstanding equity interests in Nanorep Technologies Ltd., or Nanorep, an Israeli provider of artificial intelligence, chatbot and virtual assistant services, for $43.2 million, net of cash acquired. Additionally, the Company expects to pay up to $5 million in cash to certain employees of Nanorep contingent upon their continued service over the two-year period following the closing of the acquisition and, in some cases, the achievement of specified performance conditions. At the time of the acquisition, Nanorep had approximately 55 employees and annualized revenue of approximately $5 million. The operating results of Nanorep, which have been included in the Company’s results since the date of the acquisition are not material. Accordingly, pro forma financial information for the business combination has not been presented.

GetGo Merger

On January 31, 2017, the Company completed its Merger with a wholly-owned subsidiary of Citrix, pursuant to which the Company acquired Citrix’s GoTo Business. In connection with the Merger, the Company issued 26.9 million shares of its common stock to Citrix stockholders and an additional 0.4 million of the Company’s restricted stock units in substitution for certain outstanding Citrix restricted stock units held by the GoTo Business employees. Based on the Company’s closing stock price of $108.10 on January 31, 2017 as reported by the NASDAQ Global Select Market, the total value of the shares of LogMeIn common stock issued to Citrix stockholders in connection with the Merger was $2.9 billion. In October 2017, pursuant to the terms of the merger agreement, the Company paid $3.3 million of additional purchase price for final adjustments related to defined targets for cash and cash equivalents and non-cash working capital.

The operations of the GoTo Business are included in the Company’s operating results since the date of acquisition. Since the Merger, the operating costs of the GoTo Business have been integrated with the operating costs of the Company and therefore, the Company has not provided operating income for the GoTo Business. Further, in 2018, stand-alone GoTo Business revenue will not be reported as the Company’s continued integration of its go-to-market strategy has made this metric not comparable to prior periods. During the three months ended March 31, 2017 and 2018, the Company recorded amortization of acquired intangibles of $31.0 million and $56.2 million, respectively, and acquisition-related transaction, transition and integration costs directly attributable to the Merger of $30.3 million and $2.7 million, respectively, within its condensed consolidated financial statements.

The unaudited financial information in the table below summarizes the combined results of operations for the Company and the GoTo Business, on a pro forma basis, as though the Merger had been consummated as of the beginning of 2016, including amortization charges from acquired intangible assets, the effect of acquisition accounting on the fair value of acquired deferred revenue, the inclusion of expense related to retention-based bonuses assuming full achievement of the retention requirements, the reclassification of all acquisition-related costs incurred by the Company and the GoTo Business as of the beginning of 2016 through the first quarter of 2017 (the quarter the Merger was completed), and the related tax effects. The pro forma financial information is presented for comparative purposes only and is not necessarily indicative of the results of operations that would have been achieved if the acquisition had taken place at the beginning of 2016.

Unaudited Pro Forma Financial Information (in millions)


	Three Months Ended March 31, 2017 (unaudited)
	As Reported			Pro Forma
Revenue	$	187.5		$	258.4
Net income (loss)	$	(18.6	)	$	11.2
Net income (loss) per share:
Basic	$	(0.43	)	$	0.21
Diluted	$	(0.43	)	$	0.21
Weighted average shares outstanding:
Basic		43.6			52.5
Diluted		43.6			53.7

Divestitures	3 Months Ended
Divestitures	Mar. 31, 2018
Text Block [Abstract]
Divestitures	5. Divestitures Divestiture of Xively On February 9, 2018, the Company and certain of its subsidiaries entered into an agreement to sell its Xively business. On March 20, 2018, the Company completed the sale for consideration of $49.9 million, comprised of $42.4 million of cash received in the first quarter of 2018 and $7.5 million of receivables held back as an escrow by the buyer as an exclusive security in the event of the Company’s breach of any of the representations and warranties in the definitive agreement. The $7.5 million receivable, due in September 2019, was recorded at a net present value of $7.2 million in other assets on the condensed consolidated balance sheet. The Xively disposition resulted in a gain of $33.9 million recorded in the first quarter of 2018, comprised of the present value of the $49.6 million received as consideration less net assets disposed of $13.3 million and transaction costs of $2.4 million. The net assets disposed are primarily comprised of $14.0 million of goodwill allocated to the Xively business. In fiscal year 2017, the Company recorded approximately $3 million of revenue and $13 million of operating expense directly related to its Xively business. The sale of the Xively business does not constitute a significant strategic shift that will have a material impact on the Company’s ongoing operations and financial results.

Goodwill and Intangible Assets

3 Months Ended

Mar. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

6. Goodwill and Intangible Assets

The changes in the carrying amounts of goodwill during the three months ended March 31, 2018 are primarily due to the reduction of goodwill resulting from the divestiture of the Xively business. For additional information regarding the Xively divestiture, see Note 5 to the condensed consolidated financial statements.

Changes in goodwill for the three months ended March 31, 2018 are as follows (in thousands):


Balance, January 1, 2018	$	2,208,725
Goodwill resulting from the divestiture of Xively business		(14,000	)
Foreign currency translation adjustments		(171	)

Balance, March 31, 2018	$	2,194,554

Intangible assets consist of the following (in thousands):


	December 31, 2017						March 31, 2018
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Weighted Average Life Remaining (in years)
Identifiable intangible assets:
Customer relationships	$	810,779	$	135,715	$	675,064	$	813,125	$	173,781	$	639,344		6.8
Technology		453,372		64,021		389,351		452,109		78,973		373,136		7.6
Trade names and trademarks		70,630		10,073		60,557		70,950		12,656		58,294		7.8
Other		1,360		1,323		37		3,581		1,081		2,500		7.8
Internally developed software		38,153		13,565		24,588		41,961		15,440		26,521		1.5

	$1,374,294		$224,697		$1,149,597		$1,381,726		$281,931		$1,099,795

During the three months ended March 31, 2018, the Company entered into an agreement to acquire a domain name for $2.5 million, which was paid in April 2018. The Company also capitalized $6.0 million and $7.1 million during the three months ended March 31, 2017 and 2018, respectively, of costs related to internally developed software to be sold as a service incurred during the application development stage and is amortizing these costs over the expected lives of the related services.

The Company is amortizing its intangible assets based upon the pattern in which their economic benefit will be realized, or if this pattern cannot be reliably determined, using the straight-line method over their estimated useful lives. Amortization relating to technology and internally developed software is recorded within cost of revenues and the amortization of trade names and trademarks, customer relationships, and domain names (other) is recorded within operating expenses. Amortization expense for intangible assets consisted of the following (in thousands):


	Three Months Ended March 31,
	2017		2018
Cost of revenue:
Amortization of internally developed software	$	778	$	4,394
Amortization of acquired intangibles ⁽¹⁾		9,140		17,885

Sub-Total amortization of intangibles in cost of revenue		9,918		22,279
Amortization of acquired intangibles ⁽¹⁾		24,420		41,083

Total amortization of intangibles	$	34,338	$	63,362

(1)	Total amortization of acquired intangibles was $33.6 million and $59.0 million for the three months ended March 31, 2017 and 2018, respectively.

Future estimated amortization expense for intangible assets at March 31, 2018 is as follows (in thousands):


Amortization Expense (Years Ending December 31)	Amount
2018 (nine months ending December 31)	$	191,887
2019		237,123
2020		198,025
2021		161,944
2022		126,319
Thereafter		184,497

Total	$	1,099,795

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

Accrued Liabilities

3 Months Ended

Mar. 31, 2018

Payables and Accruals [Abstract]

Accrued Liabilities

7. Accrued Liabilities

Accrued liabilities consisted of the following (in thousands):


	December 31, 2017		March 31, 2018
Marketing programs	$	6,883	$	11,067
Payroll and payroll-related		30,204		36,599
Professional fees		5,353		5,520
Acquisition-related		6,783		5,808
Other accrued liabilities		33,203		50,678

Total accrued liabilities	$	82,426	$	109,672

Acquisition-related costs include transaction, transition and integration-related fees and expenses and contingent retention-based bonus costs.

Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	8. Income Taxes The Company recorded a benefit for federal, state, and foreign taxes of $15.9 million on a loss before income taxes of $34.4 million (46% effective tax rate) and a provision of $12.7 million on a profit before income taxes of $42.4 million (30% effective tax rate) for the three months ended March 31, 2017 and 2018, respectively. The effective income tax rates for the three months ended March 31, 2017 and 2018 were impacted by profits earned in certain foreign jurisdictions, primarily the Company’s Irish subsidiaries, which are subject to significantly lower tax rates than the U.S. federal statutory rate. The effective income tax rate for the three months ended March 31, 2017 and 2018 was also impacted by $2.3 million and $1.7 million, respectively, of excess tax deductions on stock compensation recorded as discrete tax benefits and a $2.3 million tax benefit and a $1.4 million tax provision, respectively, related to discrete integration activities. During the three months ended March 31, 2018, the Company recorded a discrete income tax provision of $9.2 million on a pre-tax gain on disposition of assets of $33.9 million as a result of the divestiture of the Xively business. As a result of the Tax Cuts and Jobs Act of 2017, or the U.S. Tax Act, in the fourth quarter of 2017, the Company calculated its best estimation of the impact of the U.S. Tax Act and recognized a one-time mandatory transition tax of $14.8 million on cumulative foreign subsidiary earnings, remeasured the Company’s U.S. deferred tax assets and liabilities, which resulted in a benefit from income taxes of $105.1 million, and reassessed the net realizability of the Company’s deferred tax assets and liabilities, which resulted in a tax provision of $4.7 million. On December 22, 2017, Staff Accounting Bulletin No. 118, or SAB 118, was issued to address the application of GAAP in situations when a registrant does not have the necessary information available, prepared, or analyzed (including computations) in reasonable detail to complete the accounting for certain income tax effects of the U.S. Tax Act. The ultimate impact of the U.S. Tax Act may differ from this estimate, possibly materially, due to changes in interpretations and assumptions, guidance that may be issued and actions the Company may take in response to the U.S. Tax Act. The U.S. Tax Act is highly complex and the Company will continue to assess the impact that various provisions will have on its business. Any subsequent adjustment to these amounts will be recorded to current tax expense in the quarter of 2018 when the analysis is complete. For the three months ended March 31, 2018, the Company recorded a $0.7 million tax provision to increase its one-time mandatory transition tax estimate to $15.5 million (from $14.8 million recorded in the fourth quarter of 2017). Deferred tax assets, related valuation allowances, current tax liabilities and deferred tax liabilities are determined separately by tax jurisdiction. In making these determinations, the Company estimates deferred tax assets, current tax liabilities and deferred tax liabilities, and the Company assesses temporary differences resulting from differing treatment of items for tax and accounting purposes. As of March 31, 2018, the Company maintained a full valuation allowance against the deferred tax assets of its Hungarian subsidiary (this entity has historical tax losses) and for a portion of its California and Massachusetts state net operating losses. The Company concluded it was not more likely than not that these deferred tax assets are realizable. The Company files income tax returns in the U.S. federal jurisdiction and various state and foreign jurisdictions. The Company’s income tax returns are open to examination by federal, state, and/or foreign tax authorities. The United States federal income tax returns are open to examination from 2014. In the normal course of business, the Company and its subsidiaries are examined by various taxing authorities. The Company regularly assesses the likelihood of additional assessments by tax authorities and provides for these matters as appropriate. Audits by tax authorities typically involve examination of the deductibility of certain permanent items, limitations on net operating losses and tax credits. Although the Company believes its tax estimates are appropriate, the final determination of tax audits could result in material changes in its estimates. The Company has recorded a liability related to uncertain tax positions of $5.1 million and $5.6 million as of December 31, 2017 and March 31, 2018, respectively. The Company’s policy is to record estimated interest and penalties related to the underpayment of income taxes or unrecognized tax benefits as a component of its income tax provision, which was $14,000 and $25,000 of interest expense for the three months ended March 31, 2017 and 2018, respectively.

Common Stock and Equity

3 Months Ended

Mar. 31, 2018

Equity [Abstract]

Common Stock and Equity

9. Common Stock and Equity

On February 23, 2017, the Company’s Board of Directors approved a three-year capital return plan intended to return up to $700 million to stockholders through a combination of share repurchases and dividends. During the first quarter of 2018, the Company paid a cash dividend of $0.30 per share on February 28, 2018 to stockholders of record as of February 12, 2018. The Company’s Board of Directors will continue to review this capital return plan for potential modifications based on the Company’s financial performance, business outlook and other considerations. The timing and number of shares to be repurchased and/or the amount of cash dividends to be paid to the Company’s stockholders pursuant to the capital return plan will depend upon prevailing market conditions and other factors. Additionally, the Company’s credit facility contains certain financial and operating covenants that may restrict its ability to pay dividends in the future.

The Company paid cash dividends per share during the periods presented as follows:


	Year Ended December 31, 2017				Year Ended December 31, 2018
	Dividends Per Share		Amount (in millions)		Dividends Per Share		Amount (in millions)
First quarter ⁽¹⁾	$	0.50	$	12.8	$	0.30	$	15.7
Second quarter		0.25		13.2
Third quarter		0.25		13.2
Fourth quarter		0.25		13.2

Total cash dividends paid	$	1.25	$	52.4

(1)	The dividend paid in the first quarter of fiscal 2017 was the third of three special cash dividends announced and paid in anticipation of the completion of the GoTo Merger. The first two-special cash dividends were declared and paid in 2016.

For the three months ended March 31, 2017 and 2018, the Company repurchased 76,660 and 404,022 shares of its common stock at an average price of $97.38 and $121.38 per share, respectively, for a total cost of $7.5 million and $49.0 million, respectively.

Stock Incentive Plan

3 Months Ended

Mar. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock Incentive Plan

10. Stock Incentive Plan

The Company’s 2009 Stock Incentive Plan, or 2009 Plan, is administered by the Board of Directors and the Compensation Committee, which have the authority to designate participants and determine the number and type of awards to be granted and any other terms or conditions of the awards. The Company awards restricted stock units as its principal equity incentive award. Restricted stock units with time-based vesting conditions generally vest over a three-year period while restricted stock units with market-based or performance-based vesting conditions generally vest over two- or three-year periods. Until 2012, the Company generally granted stock options as the principal equity incentive award. Options generally vest over a four-year period and expire ten years from the date of grant. Certain stock-based awards provide for accelerated vesting if the Company experiences a change in control.

Effective on January 31, 2017, the Company’s stockholders approved an amendment and restatement of the Company’s 2009 Stock Incentive Plan, which increased the number of shares of the Company’s common stock that may be issued under the 2009 Plan by an additional 4.5 million shares and extended the term of the plan to December 5, 2026. As of March 31, 2018, 7.3 million shares remained available for grant under the 2009 Plan.

The following table summarizes stock option activity during the three months ended March 31, 2018 (shares and intrinsic value in thousands):


	Number of Options			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value
Outstanding, January 1, 2018		172		$	30.33		3.7	$	14,520

Granted		—			—
Exercised		(3	)		18.34		—	$	352

Forfeited		—			—

Outstanding, March 31, 2018		169		$	30.57		3.4	$	14,366

The aggregate intrinsic value was calculated based on the positive differences between the fair value of the Company’s common stock of $114.50 per share on December 31, 2017 and $115.55 per share on March 31, 2018, or at time of exercise, and the exercise price of the options.

During the three months ended March 31, 2018, the Company granted 17,625 time-based restricted stock units. Time-based restricted stock units generally vest one-third every year for three years and are valued on the grant date using the grant date closing price of the underlying shares.

Since 2013, the Company has granted to certain key executives restricted stock unit awards with market-based vesting conditions, which we refer to herein as TSR Units. These TSR Units are tied to the individual executive’s continued employment with the Company throughout the applicable performance period and the level of the Company’s achievement of a pre-established relative total shareholder return, or TSR, goal, as measured over an applicable performance period ranging from two to three years as compared to the TSR realized for that same period by a well-known stock index. The number of shares that may vest under these TSR Units may range from 0% to 200% of the target number of shares granted depending on the Company’s level of achievement of its TSR goal. Compensation cost for TSR Units is recognized on a straight-line basis over the requisite service period and is recognized regardless of the actual number of awards that are earned based on the level of achievement of the market-based vesting condition. For the TSR Units awarded in February 2016, the Company achieved 200% of its TSR goal for the two-year performance period ended February 2018, resulting in an additional 18,750 shares being earned and vested during the period ended March 31, 2018.

The following table summarizes restricted stock unit activity, including market-based TSR Units during the three months ended March 31, 2018 (shares in thousands):


	Number of shares Underlying Restricted Stock Units			Weighted Average Grant Date Fair Value
Unvested as of January 1, 2018		1,689		$	90.91
Restricted stock units granted		18			116.65
Restricted stock units earned		19
Restricted stock units vested		(277	)		74.43
Restricted stock units forfeited		(63	)		83.65

Unvested as of March 31, 2018		1,386		$	94.47

As of March 31, 2018, 101,988 TSR Units and 81,915 restricted stock units with performance-based vesting conditions were outstanding.

The Company recognized stock-based compensation expense within the accompanying condensed consolidated statements of operations as summarized in the following table (in thousands):


	Three Months Ended March 31,
	2017		2018
Cost of revenue	$	1,014	$	1,216
Research and development		4,429		4,943
Sales and marketing		3,606		3,695
General and administrative		5,145		6,112

	$	14,194	$	15,966

As of March 31, 2018, there was $84.3 million of total unrecognized share-based compensation cost related to unvested stock awards which are expected to be recognized over a weighted average period of 1.8 years.

Commitments and Contingencies

3 Months Ended

Mar. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

11. Commitments and Contingencies

Operating Leases — As of March 31, 2018, the Company had operating lease agreements for offices in the United States, Hungary, Germany, Australia, the United Kingdom, Ireland, Israel and India that expire at various dates through 2028.

Rent expense under all leases was $4.7 million and $5.1 million for the three months ended March 31, 2017 and 2018, respectively. The Company records rent expense on a straight-line basis for leases with scheduled escalation clauses or free rent periods.

The Company also enters into hosting services agreements with third-party data centers and internet service providers that are subject to annual renewal. Hosting fees incurred under these arrangements totaled $7.9 million and $9.0 million for the three months ended March 31, 2017 and 2018, respectively.

As of March 31, 2018, future minimum lease payments under non-cancelable operating leases including one-year commitments associated with the Company’s hosting services arrangements are approximately (in thousands):


Years Ending December 31
2018 (nine months ending December 31)	$	34,255
2019		32,472
2020		26,177
2021		19,840
2022		14,578
Thereafter		34,694

Total minimum lease payments	$	162,016

Litigation — The Company routinely assesses its current litigation and/or threatened litigation as to the probability of ultimately incurring a liability, and records its best estimate of the ultimate loss in situations where the Company assesses the likelihood of loss as probable.

In February 2006, ‘01 Communiqué, or ‘01, filed a patent infringement lawsuit against Citrix and Citrix Online, LLC in the United States District Court for the Northern District of Ohio (Case No. 1:06-cv-253), claiming that certain GoTo remote access service offerings, which have since been acquired by the Company as part of the Merger, infringed U.S. Patent No. 6,928,479, or the ‘479 Patent, which is allegedly owned by ‘01. In January 2016, an Ohio jury rendered a verdict that the GoTo services had not infringed the ‘479 Patent. The District Court affirmed the jury’s findings and denied ‘01’s request for a new trial. On March 30, 2017, ’01 initiated an appeal of this ruling and a hearing was held on February 8, 2018 at the United State Court of Appeals for the Federal Circuit. The Federal Circuit affirmed the District Court’s ruling on April 26, 2018. ‘01 has 30 days to petition for a rehearing en banc. The Company believes it has meritorious defenses to this claim and intends to defend it vigorously. Given the inherent unpredictability of litigation, the Company is unable to predict the outcome of this litigation or reasonably estimate a possible loss or range of loss associated with this litigation at this time.

The Company is from time to time subject to various other legal proceedings and claims, either asserted or unasserted, which arise in the ordinary course of business. While the outcome of these other claims cannot be predicted with certainty, management does not believe that the outcome of any of these other legal matters will have a material adverse effect on the Company’s consolidated financial statements.

Accumulated Other Comprehensive Income (Loss)	3 Months Ended
Accumulated Other Comprehensive Income (Loss)	Mar. 31, 2018
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	12. Accumulated Other Comprehensive Income (Loss) Accumulated other comprehensive income (loss) consists of foreign currency translation adjustments and changes in unrealized losses and gains (net of tax) on marketable securities. The Company has determined that the undistributed earnings of all of its foreign subsidiaries, except for 100% of the current and prior year earnings and foreign currency translation adjustments related to those earnings, will continue to be indefinitely reinvested outside the United States for any additional outside basis differences inherent in these entities. Accumulated other comprehensive income (loss) is reported as a component of stockholders’ equity and, as of December 31, 2017 and March 31, 2018, was comprised of cumulative translation adjustment gains of $15.6 million and $21.0 million, respectively. There were no material reclassifications to earnings in the three months ending March 31, 2017 and 2018.

Credit Facility	3 Months Ended
Credit Facility	Mar. 31, 2018
Debt Disclosure [Abstract]
Credit Facility	13. Credit Facility On February 1, 2017, the Company entered into an Amended and Restated Credit Agreement, or the Amended Credit Agreement, which increased the Company’s secured revolving credit facility from $150 million to $400 million in the aggregate and permits the Company to increase the revolving credit facility and/or enter into one or more tranches of term loans up to an additional $200 million. On March 23, 2018, the Company entered into a borrower accession agreement with its wholly-owned subsidiary, LogMeIn USA, Inc. and JPMorgan Chase Bank, N.A. acting in its capacity as administrative agent, pursuant to which LogMeIn USA, Inc. became a borrower under the Company’s existing multi-currency Amended and Restated Credit Agreement. The credit facility matures February 1, 2022. The Company may prepay the loans or terminate or reduce the commitments in whole or in part at any time, without premium or penalty. The Company and its subsidiaries expect to use the credit facility for general corporate purposes, including, but not limited to, the potential acquisition of complementary products or businesses, share repurchases, as well as for working capital. There were no outstanding borrowings as of March 31, 2018. Loans under the Amended Credit Agreement bear interest at variable rates which reset every 30 to 180 days depending on the rate and period selected by the Company as described below. The quarterly commitment fee on the undrawn portion of the credit facility ranges from 0.15% to 0.30% per annum, based upon the Company’s total leverage ratio. The Amended Credit Agreement contains customary affirmative and negative covenants, subject to customary and other exceptions for a credit facility of this size and type, each as further described in the Amended Credit Agreement. As of March 31, 2018, the Company was in compliance with all financial and operating covenants of the Amended Credit Agreement. Any failure to comply with the financial or operating covenants of the Amended Credit Agreement would prevent the Company from being able to borrow additional funds, and would constitute a default, permitting the lenders to, among other things, accelerate the amounts outstanding, including all accrued interest and unpaid fees, under the credit facility and to terminate the credit facility. As of March 31, 2018, the Company had $2.1 million of origination costs recorded in other assets on the accompanying condensed consolidated balance sheet. As permitted by ASU 2015-15, the Company presents debt issuance costs as an asset and subsequently amortizes the deferred debt issuance costs ratably over the term of the credit facility.

Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	14. Subsequent Events Cash Dividend On April 24, 2018, the Company’s Board of Directors declared a cash dividend of $0.30 per share of common stock. The dividend is payable on May 25, 2018 to stockholders of record as of May 9, 2018. Agreement to Acquire Jive Communications, Inc. On April 3, 2018, the Company’s wholly-owned subsidiary, LogMeIn USA, Inc., acquired Jive Communications, Inc., or Jive, a provider of cloud-based phone systems and Unified Communications services, pursuant to an Agreement and Plan of Merger dated February 7, 2018. As a result of the acquisition, Jive became a wholly-owned subsidiary of LogMeIn USA, Inc. LogMeIn USA, Inc. paid approximately $342 million in cash (net of cash acquired) to complete the acquisition, subject to a working capital adjustment following the closing. In addition, LogMeIn USA, Inc. is expected to pay up to $15 million in cash contingent payments to certain employees of Jive upon the achievement of specified retention milestones over the two-year period following the closing. The Company funded the acquisition through a combination of cash on-hand and $200 million of borrowings under its Amended Credit Agreement. At the time of closing, Jive had approximately 700 employees and fiscal year 2017 revenue was approximately $80 million. The Company has not yet completed its acquisition accounting for this transaction. Credit Facility On April 2, 2018, the Company borrowed $200 million, or the Loan, under the Amended Credit Agreement to partially fund the acquisition of Jive. As of April 2, 2018, the annual rate on the Loan was 3.19% (which will reset on May 3, 2018).

Summary of Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Principles of Consolidation

Principles of Consolidation — The accompanying condensed consolidated financial statements include the results of operations of the Company and its wholly-owned subsidiaries. All intercompany transactions and balances have been eliminated in consolidation. The Company has prepared the accompanying condensed consolidated financial statements in conformity with accounting principles generally accepted in the United States of America, or GAAP.

Unaudited Interim Condensed Consolidated Financial Statements

Unaudited Interim Condensed Consolidated Financial Statements — The accompanying condensed consolidated financial statements and the related interim information contained within the notes to the condensed consolidated financial statements are unaudited and have been prepared in accordance with GAAP and applicable rules and regulations of the Securities and Exchange Commission for interim financial information. Accordingly, they do not include all of the information and notes required by GAAP for complete financial statements. The accompanying unaudited condensed consolidated financial statements should be read along with the Company’s audited financial statements included in the Company’s Annual Report on Form 10-K, filed with the Securities and Exchange Commission on February 20, 2018. The unaudited interim condensed consolidated financial statements have been prepared on the same basis as the audited financial statements and in the opinion of management, reflect all adjustments, consisting of normal and recurring adjustments, necessary for the fair presentation of the Company’s financial position, results of operations and cash flows for the interim periods presented. The results for the interim periods presented are not necessarily indicative of future results. The Company considers events or transactions that occur after the balance sheet date but before the financial statements are issued to provide additional evidence relative to certain estimates or to identify matters that require additional disclosure.

Use of Estimates

Use of Estimates — The preparation of condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. By their nature, estimates are subject to an inherent degree of uncertainty. Actual results could differ from those estimates.

Recently Adopted Accounting Pronouncements

Recently Adopted Accounting Pronouncements

On January 1, 2018, the Company adopted ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash (a consensus of the FASB’s EITF), referred to herein as ASU 2016-18, which requires restricted cash to be included with cash and cash equivalents when reconciling the beginning and ending amounts on the statement of cash flows. The adoption of ASU 2016-18 impacted the presentation of the condensed consolidated statement of cash flows with the inclusion of restricted cash for each of the presented periods.

Cash and cash equivalents subject to contractual restrictions and not readily available for use are classified as restricted cash. The Company’s restricted cash balances are primarily made up of cash posted as collateral for its worldwide facility leases. The following table provides a reconciliation of cash, cash equivalents and restricted cash as reported in the condensed consolidated balance sheet as of December 31, 2015, 2016 and 2017 and March 31, 2017 and 2018, to the total of the amounts reported in the condensed consolidated statement of cash flows included herein (in thousands):


	As of December 31,						As of March 31,
	2015		2016		2017		2017		2018
Cash and cash equivalents	$	123,143	$	140,756	$	252,402	$	266,723	$	365,180
Restricted cash, current, included in prepaid expenses and other current assets		—		98		12		151		58
Restricted cash, net of current portion		2,468		2,481		1,795		1,368		1,844

Cash, cash equivalents and restricted cash	$	125,611	$	143,335	$	254,209	$	268,242	$	367,082

In May 2014, the Financial Accounting Standards Board, or FASB, issued ASU 2014-09, Revenue from Contracts with Customers, and has since issued several additional amendments thereto (collectively referred to herein as ASC 606) which became effective for the Company on January 1, 2018. ASC 606 outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes Accounting Standards Codification Topic 605, Revenue Recognition, or ASC 605, including industry-specific guidance. The new standard requires entities to apportion consideration from contracts to performance obligations on a relative standalone selling price basis, based on a five-step model. Under ASC 606, revenue is recognized when a customer obtains control of a promised good or service and is recognized in an amount that reflects the consideration that the entity expects to receive in exchange for the good or service. In addition, ASC 606 also includes subtopic ASC 340-40, Other Assets and Deferred Costs- Contracts with Customers, referred to herein as ASC 340-40, which provides guidance on accounting for certain revenue related costs including costs associated with obtaining and fulfilling a contract, discussed further below.

Revenue recognition from the Company’s primary revenue streams remained substantially unchanged following adoption of ASC 606 and therefore did not have a material impact on its revenues. The Company also considered the impact of ASC 606 subtopic ASC 340-40. Prior to the adoption of ASC 606, the Company expensed commission costs and related fringe benefits as incurred. Under ASC 340-40, the Company is required to capitalize and amortize incremental costs of obtaining a contract, such as sales commissions and related fringe benefits, over the period of benefit, which the Company has calculated to be three years. Incremental costs of obtaining a contract are recognized as an asset if the costs are expected to be recovered. The period of benefit was determined based on an average customer contract term, technology changes, and the company’s ability to retain customers. Sales commissions for renewal contracts are deferred and amortized on a straight-line basis over the related contractual renewal period. Amortization expense is included in sales and marketing expense on the condensed consolidated statements of operations.

On January 1, 2018, the Company adopted ASC 606 using the modified retrospective transition method which resulted in an adjustment to retained earnings for the cumulative effect of applying the standard to all contracts not completed as of the adoption date. Upon adoption, prepaid expenses and other current assets increased by $10.7 million due to the capitalization of the current portion of sales commissions and other assets increased by $17.3 million due to the capitalization of the noncurrent portion of sales commissions. Deferred tax liabilities increased by $6.6 million due to temporary differences between the accounting and tax carrying values of the capitalized commissions. Retained earnings increased by $21.4 million as a net result of these adjustments. The comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods.

The Company has elected the use of practical expedients in its adoption of the new standard, which includes continuing to record revenue reported net of applicable taxes imposed on the related transaction and the application of the standard to all contracts not completed as of the adoption date.

Costs to Obtain and Fulfill a Contract

Costs to Obtain and Fulfill a Contract — The Company’s incremental costs of obtaining a contract consist of sales commissions and their related fringe benefits. Sales commissions and fringe benefits paid on renewals are not commensurate with sales commissions paid on the initial contract, but they are commensurate with each other. Sales commissions and fringe benefits are deferred and amortized on a straight-line basis over the period of benefit, which the Company has estimated to be three years, for initial contracts and are amortized over the renewal period for renewal contracts, typically one year. The period of benefit was determined based on an average customer contract term, expected contract renewals, changes in technology and the Company’s ability to retain customers. Deferred commissions are classified as current or noncurrent assets based on the timing the expense will be recognized. The current and noncurrent portions of deferred commissions are included in prepaid expenses and other current assets and other assets, respectively, in the Company’s condensed consolidated balance sheets. As of March 31, 2018, the Company had $14.1 million of current deferred commissions and $20.0 million of noncurrent deferred commissions. Commissions expense is primarily included in sales and marketing expense on the condensed consolidated statements of operations. The Company had amortization expense of $3.3 million related to deferred commissions during the three months ended March 31, 2018. Other costs incurred to fulfill contracts have been immaterial to date.

Revenue Recognition

Revenue Recognition — The Company derives its revenue primarily from subscription fees for its premium subscription software services and, to a lesser extent, usage fees from audio services. Revenue is reported net of applicable sales and use tax, value-added tax and other transaction taxes imposed on the related transaction including mandatory government charges that are passed through to the Company’s customers. Revenue is recognized when control of these services is transferred to the Company’s customers, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those services.

The Company determines revenue recognition through the following five steps:

•

Identification of the contract, or contracts, with a customer

•

Identification of the performance obligations in the contract

•

Determination of the transaction price

•

Allocation of the transaction price to the performance obligations in the contract

•

Recognition of revenue when, or as, performance obligations are satisfied

The Company accounts for a contract when it has approval and commitment from both parties, the rights of the parties are identified, payment terms are identified, the contract has commercial substance and collectability of consideration is probable.

Disaggregated Revenue

Disaggregated Revenue — The Company disaggregates revenue from contracts with customers by geography and product grouping, as it believes it best depicts how the nature, amount, timing and uncertainty of revenue and cash flows are affected by economic factors.

Performance obligations

Performance Obligations

Premium Subscription Services — Revenue from the Company’s premium subscription services represent a single promise to provide continuous access (i.e. a stand-ready obligation) to its software solutions and their processing capabilities in the form of a service through one of the Company’s data centers. The Company’s software cannot be run on another entity’s hardware and customers do not have the right to take possession of the software and use it on their own or another entity’s hardware.

As each day of providing access to the software is substantially the same and the customer simultaneously receives and consumes the benefits as access is provided, the Company has determined that its premium subscription services arrangements include a single performance obligation comprised of a series of distinct services. Revenue from the Company’s premium subscription services is recognized over time on a ratable basis over the contract term beginning on the date that our service is made available to the customer. Subscription periods range from monthly to multi-year, with the majority of contracts being one year, billed annually in advance, and non-cancelable.

Audio Services — Revenue from the Company’s audio services represent a single promise to stand-ready to provide access to the Company’s platform. As each day of providing audio services is substantially the same and the customer simultaneously receives and consumes the benefits as access is provided, the Company has determined that its audio services arrangements include a single performance obligation comprised of a series of distinct services. These audio services may include fixed consideration, variable consideration or a combination of the two. Variable consideration in these arrangements is typically a function of the corresponding rate per minute. The Company allocates the variable amount to each distinct service period within the series and recognize revenue as each distinct service period is performed (i.e., recognized as incurred).

Accounts Receivable, Net

Accounts Receivable, Net — Accounts receivable, net, are amounts due from customers where there is an unconditional right to consideration. Unbilled receivables of $5.1 million and $3.0 million are included in this balance at December 31, 2017 and March 31, 2018, respectively. The payment of consideration related to these unbilled receivables is subjected only to the passage of time.

Contract Assets and Contract Liabilities

Contract Assets and Contract Liabilities — Contract assets and contract liabilities (deferred revenue) are reported net at the contract level for each reporting period.

Contract Assets

Contract Assets — Contract assets primarily relate to unbilled amounts typically resulting from sales contracts when revenue recognized exceeds the amount billed to the customer, and right to payment is not just subject to the passage of time. The contract assets are transferred to accounts receivable when the rights become unconditional. There are no contract assets as of December 31, 2017 and March 31, 2018.

Contract Liabilities (Deferred Revenue)

Contract Liabilities (Deferred Revenue) — Deferred revenue primarily consists of billings and payments received in advance of revenue recognition. The Company primarily bills and collects payments from customers for its services in advance on a monthly and annual basis. The Company initially records subscription fees as deferred revenue and then recognizes revenue as performance obligations are satisfied, over the subscription period. Typically, subscriptions automatically renew at the end of the subscription period unless the customer specifically terminates it prior to the end of the period. Deferred revenue to be recognized within the next twelve months is included in current deferred revenue, and the remaining is included in long-term deferred revenue in the condensed consolidated balance sheets.

For the three months ended March 31, 2018, revenue recognized related to deferred revenue at January 1, 2018 was approximately $154 million. Approximately $503 million of revenue is expected to be recognized from remaining performance obligations as of March 31, 2018.

Changes in contract balances for the three months ended March 31, 2018 are as follows (in thousands):


	Deferred Revenue
	Current		Non-Current
Balance as of January 1, 2018	$	340,570	$	6,735
Increase (decrease), net		39,574		(1,958	)

Balance as of March 31, 2018	$	380,144	$	4,777

Segment Data

Segment Data — Operating segments are identified as components of an enterprise for which separate discrete financial information is available for evaluation by the chief operating decision-maker or decision-making group when making decisions regarding resource allocation and assessing performance. The Company’s chief operating decision maker is its Chief Executive Officer. The Company, whose management uses consolidated financial information in determining how to allocate resources and assess performance, has determined that it operates in one segment.

Marketable Securities

Marketable Securities — The Company’s marketable securities are classified as available-for-sale and are carried at fair value with the unrealized gains and losses, net of tax, reported as a component of accumulated other comprehensive loss in equity. Realized gains and losses and declines in value judged to be other than temporary are included as a component of earnings based on the specific identification method. Fair value is determined based on quoted market prices. At March 31, 2017, marketable securities consisted of U.S. government agency securities and corporate bonds that had remaining maturities within two years and have an aggregate amortized cost of $29.4 million and an aggregate fair value of $29.4 million, including $1,000 of unrealized gains and $34,000 of unrealized losses. The Company did not have any marketable securities as of December 31, 2017 or March 31, 2018.

Goodwill

Goodwill — Goodwill is the excess of the acquisition price over the fair value of the tangible and identifiable intangible net assets acquired. The Company does not amortize goodwill but performs an impairment test of goodwill annually or whenever events and circumstances indicate that the carrying amount of goodwill may exceed its fair value. The Company operates as a single operating segment with one reporting unit and consequently evaluates goodwill for impairment based on an evaluation of the fair value of the Company as a whole. As of November 30, 2017, our measurement date, the fair value of the Company as a whole exceeded the carrying amount of the Company. Through March 31, 2018, no events have been identified indicating an impairment.

Long-Lived Assets and Intangible Assets

Long-Lived Assets and Intangible Assets — The Company records intangible assets at their respective estimated fair values at the date of acquisition. Intangible assets are being amortized based upon the pattern in which their economic benefit will be realized, or if this pattern cannot be reliably determined, using the straight-line method over their estimated useful lives, which range up to eleven years.

The Company reviews long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of the assets, including intangible assets, may not be recoverable. When such events occur, the Company compares the carrying amounts of the assets to their undiscounted expected future cash flows. If this comparison indicates that there is impairment, the amount of the impairment is calculated as the difference between the carrying value and fair value. Through March 31, 2018, the Company recorded no material impairments.

Foreign Currency Translation

Foreign Currency Translation — The functional currency of operations outside the United States of America is deemed to be the currency of the local country, unless it is otherwise determined that the United States dollar would serve as a more appropriate functional currency given the economic operations of the entity. Accordingly, the assets and liabilities of the Company’s foreign subsidiaries are translated into United States dollars using the period-end exchange rate, and income and expense items are translated using the average exchange rate during the period. Cumulative translation adjustments are reflected as a separate component of equity. Foreign currency transaction gains and losses are charged to operations.

Derivative Financial Instruments

Derivative Financial Instruments — The Company’s earnings and cash flows are subject to fluctuations due to changes in foreign currency exchange rates. The Company uses foreign currency forward contracts to manage exposure to fluctuations in foreign exchange rates that arise from receivables and payables denominated in foreign currencies. The Company does not designate foreign currency forward contracts as hedges for accounting purposes, and changes in the fair value of these instruments are recognized immediately in earnings. Because the Company enters into forward contracts only as an economic hedge, any gain or loss on the underlying foreign-denominated balance would be offset by the loss or gain on the forward contract. Gains and losses on forward contracts and foreign denominated receivables and payables are included in net foreign currency gains and losses.

As of December 31, 2017 and March 31, 2018, the Company had outstanding forward contracts with notional amounts equivalent to the following (in thousands):


Currency Hedged	December 31, 2017		March 31, 2018
Euro / Canadian Dollar	$	556	$	654
Euro / U.S. Dollar		4,208		4,961
Euro / British Pound		5,926		5,336
Israeli Shekel / Hungarian Forint		8,008		—

Total		18,698	$	10,951

The Company had a net foreign currency gain of $0.1 million for the three months ended March 31, 2017 and a net foreign currency loss of $0.2 million for the three months ended March 31, 2018, respectively, which are included in other income (expense), net in the condensed consolidated statements of operations.

Stock-Based Compensation

Stock-Based Compensation — The Company values all stock-based compensation, including grants of stock options and restricted stock units, at fair value on the date of grant and recognizes the expense over the requisite service period, which is generally the vesting period of the award, for those awards expected to vest, on a straight-line basis.

Income Taxes

Income Taxes — Deferred income taxes are provided for the tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes and operating loss carryforwards and credits using enacted tax rates expected to be in effect in the years in which the differences are expected to reverse. At each balance sheet date, the Company assesses the likelihood that deferred tax assets will be realized and recognizes a valuation allowance if it is more likely than not that some portion of the deferred tax assets will not be realized. This assessment requires judgment as to the likelihood and amounts of future taxable income by tax jurisdiction.

The Company evaluates its uncertain tax positions based on a determination of whether and how much of a tax benefit taken by the Company in its tax filings is more likely than not to be realized. Potential interest and penalties associated with any uncertain tax positions are recorded as a component of income tax expense.

Guarantees and Indemnification Obligations

Guarantees and Indemnification Obligations — As permitted under Delaware law, the Company has agreements whereby the Company indemnifies certain of its officers and directors for certain events or occurrences while the officer or director is, or was, serving at the Company’s request in such capacity. The term of the indemnification period is for the officer’s or director’s lifetime. As permitted under Delaware law, the Company also has similar indemnification obligations under its certificate of incorporation and by-laws. The maximum potential amount of future payments the Company could be required to make under these indemnification agreements is unlimited; however, the Company has directors’ and officers’ insurance coverage that the Company believes limits its exposure and enables it to recover a portion of any future amounts paid.

In the ordinary course of business, the Company enters into agreements with certain customers that contractually obligate the Company to provide indemnifications of varying scope and terms with respect to certain matters including, but not limited to, losses arising out of the breach of such agreements, from the services provided by the Company or claims alleging that the Company’s products infringe third-party patents, copyrights, or trademarks. The term of these indemnification obligations is generally perpetual. The maximum potential amount of future payments the Company could be required to make under these indemnification obligations is, in many cases, unlimited. Through March 31, 2018, the Company has not experienced any losses related to these indemnification obligations.

Net Income (Loss) Per Share

Net Income (Loss) Per Share — Basic net income (loss) per share is computed by dividing net income (loss) by the weighted average number of common shares outstanding for the period. Diluted net income (loss) per share is computed by dividing net income (loss) by the sum of the weighted average number of common shares outstanding during the period and, if dilutive, the weighted average number of potential common shares outstanding from the assumed exercise of stock options and the vesting of restricted stock units. For the three months ended March 31, 2017, the Company incurred a net loss and therefore, the effect of the Company’s outstanding common stock equivalents was not included in the calculation of diluted loss per share as they were anti-dilutive. Accordingly, basic and dilutive net loss per share for the period were identical.

The Company excluded the following options to purchase common shares and restricted stock units from the computation of diluted net loss per share because they had an anti-dilutive impact (in thousands):


	Three Months Ended March 31,
	2017		2018
Options to purchase common shares		234		—
Restricted stock units		1,806		—

Total options and restricted stock units		2,040		—

Basic and diluted net income (loss) per share was calculated as follows (in thousands, except per share data):


	Three months ended March 31,
	2017			2018
Net income (loss)	$	(18,564	)	$	29,712

Basic:
Weighted average common shares outstanding, basic		43,570			52,457

Net income (loss) per share, basic	$	(0.43	)	$	0.57

Diluted:
Weighted average common shares outstanding		43,570			52,457
Add: Common stock equivalents		—			958

Weighted average common shares outstanding, diluted		43,570			53,415

Net income (loss) per share, diluted	$	(0.43	)	$	0.56

Recently Issued Accounting Pronouncements

Recently Issued Accounting Pronouncements

On February 25, 2016, the FASB issued ASU 2016-02, Leases, or ASU 2016-02, which will require lessees to recognize most leases on their balance sheet as a right-of-use asset and a lease liability. Leases will be classified as either operating or finance, and classification will be based on criteria similar to current lease accounting, but without explicit bright lines. The guidance is effective for annual reporting periods beginning after December 15, 2018 and interim periods within those fiscal years, and early adoption is permitted. Although the Company is currently assessing the impact of adoption of ASU 2016-02 on its consolidated financial statements, the Company currently believes the most significant changes will be related to the recognition of new right-of-use assets and lease liabilities on the Company’s balance sheet for operating leases.

On January 26, 2017, the FASB issued ASU 2017-04, Intangibles—Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment, or ASU 2017-04, which simplifies the accounting for goodwill impairments by eliminating step two from the goodwill impairment test. Instead, if the carrying amount of a reporting unit exceeds its fair value, an impairment loss shall be recognized in an amount equal to that excess, limited to the total amount of goodwill allocated to that reporting unit. ASU 2017-04 also clarifies the requirements for excluding and allocating foreign currency translation adjustments to reporting units related to an entity’s testing of reporting units for goodwill impairment, and that an entity should consider income tax effects from any tax-deductible goodwill on the carrying amount of the reporting unit when measuring the goodwill impairment loss, if applicable. The guidance is effective for annual reporting periods beginning after January 1, 2020 and interim periods within those fiscal years. The Company is currently assessing the potential impact of the adoption of ASU 2017-04 on its condensed consolidated financial statements.

On February 15, 2018, the FASB issued ASU 2018-02, Income Statement—Reporting Comprehensive Income—Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income (Topic 220), or ASU 2018-02, which allows for a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act of 2017, or the U.S. Tax Act. The guidance is effective for annual reporting periods beginning after December 15, 2018 and interim periods within those fiscal years, and early adoption is permitted. The Company is currently assessing the potential impact of adoption of ASU 2018-02 on its condensed consolidated financial statements.

Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Reconciliation of Cash, Cash Equivalents and Restricted Cash

The following table provides a reconciliation of cash, cash equivalents and restricted cash as reported in the condensed consolidated balance sheet as of December 31, 2015, 2016 and 2017 and March 31, 2017 and 2018, to the total of the amounts reported in the condensed consolidated statement of cash flows included herein (in thousands):


	As of December 31,						As of March 31,
	2015		2016		2017		2017		2018
Cash and cash equivalents	$	123,143	$	140,756	$	252,402	$	266,723	$	365,180
Restricted cash, current, included in prepaid expenses and other current assets		—		98		12		151		58
Restricted cash, net of current portion		2,468		2,481		1,795		1,368		1,844

Cash, cash equivalents and restricted cash	$	125,611	$	143,335	$	254,209	$	268,242	$	367,082

Summary of Impact of Adopting ASC 606 on Company's Condensed Consolidated Financial Statements

The following tables summarize the impact of adopting ASC 606 on the Company’s condensed consolidated financial statements during the three months ended and as of March 31, 2018 (in thousands):


	As of March 31, 2018
	As Reported		Adjustments			Balance Without Adoption of ASC 606
Condensed Consolidated Balance Sheet
Assets
Prepaid expenses and other current assets	$	56,735	$	(14,051	)	$	42,684
Other assets		33,810		(20,003	)		13,807
Liabilities
Deferred tax liabilities	$	218,507	$	(7,955	)	$	210,552
Equity
Retained earnings	$	85,849	$	(26,098	)	$	59,751


	Three Months Ended March 31, 2018
	As Reported			Adjustments			Balance Without Adoption of ASC 606
Condensed Consolidated Statement of Operations
Sales and marketing	$	88,215		$	5,967		$	94,182
(Provision for) benefit from income taxes	$	(12,723	)	$	1,391		$	(11,332	)
Net income (loss)	$	29,712		$	(4,576	)	$	25,136
Net income (loss) per share
Basic	$	0.57		$	(0.09	)	$	0.48
Diluted	$	0.56		$	(0.09	)	$	0.47

	Three Months Ended March 31, 2018
	As Reported			Adjustments			Balance Without Adoption of ASC 606
Condensed Consolidated Statement of Cash Flows
Cash flows from operating activities
Net income	$	29,712		$	(4,576	)	$	25,136
Benefit from deferred income taxes		(9,353	)		(1,391	)		(10,744	)
Prepaid expenses and other current assets		4,767			3,362			8,129
Other assets		(2,767	)		2,605			(162	)
Net cash provided by operating activities		153,973			—			153,973

Schedule of Revenue by Geographic Areas

The Company’s revenue by geography (based on customer address) is as follows (in thousands):


	Three Months Ended March 31,
	2017		2018
Revenues:
United States	$	141,178	$	211,754
United Kingdom		11,496		14,066
International—all other		34,784		53,397

Total revenue	$	187,458	$	279,217

Schedule of Revenue by Product Grouping

The Company’s revenue by product grouping is as follows (in thousands):


	Three Months Ended March 31,
	2017		2018
Revenues:
Communications and collaboration	$	89,733	$	149,907
Identity and access		60,546		84,670
Customer engagement and support		37,179		44,640

Total revenue	$	187,458	$	279,217

Summary of Changes in Deferred Revenue

Changes in contract balances for the three months ended March 31, 2018 are as follows (in thousands):


	Deferred Revenue
	Current		Non-Current
Balance as of January 1, 2018	$	340,570	$	6,735
Increase (decrease), net		39,574		(1,958	)

Balance as of March 31, 2018	$	380,144	$	4,777

Summary of Outstanding Forward Contracts with Notional Amounts Equivalents

As of December 31, 2017 and March 31, 2018, the Company had outstanding forward contracts with notional amounts equivalent to the following (in thousands):


Currency Hedged	December 31, 2017		March 31, 2018
Euro / Canadian Dollar	$	556	$	654
Euro / U.S. Dollar		4,208		4,961
Euro / British Pound		5,926		5,336
Israeli Shekel / Hungarian Forint		8,008		—

Total	$	18,698	$	10,951

Schedule of Options to Purchase Common Shares and Restricted Stock Units

The Company excluded the following options to purchase common shares and restricted stock units from the computation of diluted net loss per share because they had an anti-dilutive impact (in thousands):


	Three Months Ended March 31,
	2017		2018
Options to purchase common shares		234		—
Restricted stock units		1,806		—

Total options and restricted stock units		2,040		—

Reconciliation of Basic and Diluted Net Income per Share

Basic and diluted net income (loss) per share was calculated as follows (in thousands, except per share data):


	Three months ended March 31,
	2017			2018
Net income (loss)	$	(18,564	)	$	29,712

Basic:
Weighted average common shares outstanding, basic		43,570			52,457

Net income (loss) per share, basic	$	(0.43	)	$	0.57

Diluted:
Weighted average common shares outstanding		43,570			52,457
Add: Common stock equivalents		—			958

Weighted average common shares outstanding, diluted		43,570			53,415

Net income (loss) per share, diluted	$	(0.43	)	$	0.56

Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Summary of Company's Significant Financial Assets and Liabilities Measured at Fair Value on Recurring Basis

The Company’s significant financial assets and liabilities measured at fair value on a recurring basis were as follows (in thousands):


	Fair Value Measurements at December 31, 2017
	Level 1		Level 2		Level 3		Total
Financial assets:
Cash equivalents — money market funds	$	148,120	$	10,000	$	—	$	158,120
Financial liabilities:
Forward contracts ($18.7 million notional amount)		—		29		—		29

	Fair Value Measurements at March 31, 2018
	Level 1		Level 2		Level 3		Total
Financial assets:
Cash equivalents — money market funds	$	230,287	$	—	$	—	$	230,287
Forward contracts ($11.0 million notional amount)		—		34		—		34

Acquisitions (Tables)

3 Months Ended

Mar. 31, 2018

Business Combinations [Abstract]

Summary of Unaudited Pro Forma Information

Unaudited Pro Forma Financial Information (in millions)


	Three Months Ended March 31, 2017 (unaudited)
	As Reported			Pro Forma
Revenue	$	187.5		$	258.4
Net income (loss)	$	(18.6	)	$	11.2
Net income (loss) per share:
Basic	$	(0.43	)	$	0.21
Diluted	$	(0.43	)	$	0.21
Weighted average shares outstanding:
Basic		43.6			52.5
Diluted		43.6			53.7

Goodwill and Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in Goodwill

Changes in goodwill for the three months ended March 31, 2018 are as follows (in thousands):


Balance, January 1, 2018	$	2,208,725
Goodwill resulting from the divestiture of Xively business		(14,000	)
Foreign currency translation adjustments		(171	)

Balance, March 31, 2018	$	2,194,554

Intangible Assets

Intangible assets consist of the following (in thousands):


	December 31, 2017						March 31, 2018
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Weighted Average Life Remaining (in years)
Identifiable intangible assets:
Customer relationships	$	810,779	$	135,715	$	675,064	$	813,125	$	173,781	$	639,344		6.8
Technology		453,372		64,021		389,351		452,109		78,973		373,136		7.6
Trade names and trademarks		70,630		10,073		60,557		70,950		12,656		58,294		7.8
Other		1,360		1,323		37		3,581		1,081		2,500		7.8
Internally developed software		38,153		13,565		24,588		41,961		15,440		26,521		1.5

	$1,374,294		$224,697		$1,149,597		$1,381,726		$281,931		$1,099,795

Amortization Expense for Intangible Assets

Amortization expense for intangible assets consisted of the following (in thousands):


	Three Months Ended March 31,
	2017		2018
Cost of revenue:
Amortization of internally developed software	$	778	$	4,394
Amortization of acquired intangibles ⁽¹⁾		9,140		17,885

Sub-Total amortization of intangibles in cost of revenue		9,918		22,279
Amortization of acquired intangibles ⁽¹⁾		24,420		41,083

Total amortization of intangibles	$	34,338	$	63,362

(1)	Total amortization of acquired intangibles was $33.6 million and $59.0 million for the three months ended March 31, 2017 and 2018, respectively.

Future Estimated Amortization Expense

Future estimated amortization expense for intangible assets at March 31, 2018 is as follows (in thousands):


Amortization Expense (Years Ending December 31)	Amount
2018 (nine months ending December 31)	$	191,887
2019		237,123
2020		198,025
2021		161,944
2022		126,319
Thereafter		184,497

Total	$	1,099,795

Accrued Liabilities (Tables)

3 Months Ended

Mar. 31, 2018

Payables and Accruals [Abstract]

Summary of Accrued Liabilities

Accrued liabilities consisted of the following (in thousands):


	December 31, 2017		March 31, 2018
Marketing programs	$	6,883	$	11,067
Payroll and payroll-related		30,204		36,599
Professional fees		5,353		5,520
Acquisition-related		6,783		5,808
Other accrued liabilities		33,203		50,678

Total accrued liabilities	$	82,426	$	109,672

Common Stock and Equity (Tables)

3 Months Ended

Mar. 31, 2018

Equity [Abstract]

Summary of Dividend Declared and Paid

The Company paid cash dividends per share during the periods presented as follows:


	Year Ended December 31, 2017				Year Ended December 31, 2018
	Dividends Per Share		Amount (in millions)		Dividends Per Share		Amount (in millions)
First quarter ⁽¹⁾	$	0.50	$	12.8	$	0.30	$	15.7
Second quarter		0.25		13.2
Third quarter		0.25		13.2
Fourth quarter		0.25		13.2

Total cash dividends paid	$	1.25	$	52.4

(1)	The dividend paid in the first quarter of fiscal 2017 was the third of three special cash dividends announced and paid in anticipation of the completion of the GoTo Merger. The first two-special cash dividends were declared and paid in 2016.

Stock Incentive Plan (Tables)

3 Months Ended

Mar. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of Stock Option Activity

The following table summarizes stock option activity during the three months ended March 31, 2018 (shares and intrinsic value in thousands):


	Number of Options			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value
Outstanding, January 1, 2018		172		$	30.33		3.7	$	14,520

Granted		—			—
Exercised		(3	)		18.34		—	$	352

Forfeited		—			—

Outstanding, March 31, 2018		169		$	30.57		3.4	$	14,366

Schedule of Restricted Stock Unit Activity Including Market-based Units

The following table summarizes restricted stock unit activity, including market-based TSR Units during the three months ended March 31, 2018 (shares in thousands):


	Number of shares Underlying Restricted Stock Units			Weighted Average Grant Date Fair Value
Unvested as of January 1, 2018		1,689		$	90.91
Restricted stock units granted		18			116.65
Restricted stock units earned		19
Restricted stock units vested		(277	)		74.43
Restricted stock units forfeited		(63	)		83.65

Unvested as of March 31, 2018		1,386		$	94.47

Schedule of Stock Based Compensation Allocated to Expense

The Company recognized stock-based compensation expense within the accompanying condensed consolidated statements of operations as summarized in the following table (in thousands):


	Three Months Ended March 31,
	2017		2018
Cost of revenue	$	1,014	$	1,216
Research and development		4,429		4,943
Sales and marketing		3,606		3,695
General and administrative		5,145		6,112

	$	14,194	$	15,966

Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Schedule of Minimum Future Lease Payments Receivable

As of March 31, 2018, future minimum lease payments under non-cancelable operating leases including one-year commitments associated with the Company’s hosting services arrangements are approximately (in thousands):


Years Ending December 31
2018 (nine months ending December 31)	$	34,255
2019		32,472
2020		26,177
2021		19,840
2022		14,578
Thereafter		34,694

Total minimum lease payments	$	162,016

Summary of Significant Accounting Policies - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	$ 365,180	$ 252,402	$ 266,723	$ 140,756	$ 123,143
Restricted cash, current, included in prepaid expenses and other current assets	58	12	151	98
Restricted cash, net of current portion	1,844	1,795	1,368	2,481	2,468
Cash, cash equivalents and restricted cash	$ 367,082	$ 254,209	$ 268,242	$ 143,335	$ 125,611

Summary of Significant Accounting Policies - Additional Information (Detail)		3 Months Ended		12 Months Ended
	Jan. 01, 2018 USD ($)	Mar. 31, 2018 USD ($) Customer	Mar. 31, 2017 USD ($) Customer	Dec. 31, 2017 USD ($) Customer
Organization And Summary Of Significant Accounting Policies [Line Items]
Increase in prepaid expenses and other current assets		$ (4,767,000)	$ 6,898,000
Increase in other assets		2,767,000	$ (88,000)
Current deferred commissions		14,100,000
Noncurrent deferred commissions		20,000,000
Amortization expense related to deferred commissions		3,300,000
Unbilled receivables		3,000,000		$ 5,100,000
Contract assets		0		0
Revenue recognized related to deferred revenue		154,000,000
Revenue is expected to be recognized from remaining performance obligations		503,000,000
Marketable securities, maturities remaining			2 years
Marketable securities, amortized cost			$ 29,400,000
Marketable securities		0	29,400,000	$ 0
Marketable securities, unrealized gains			1,000
Marketable securities, unrealized losses			34,000
Long-lived asset impairment		0
Net foreign currency contract gain (loss)		$ (200,000)	$ 100,000
Accounting Standards Update 2014-09 [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Increase in prepaid expenses and other current assets	$ 10,700,000
Increase in other assets	17,300,000
Increase in deferred tax liabilities	6,600,000
Increase in retained earnings	$ 21,400,000
Sales Revenue, Net [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Revenue, number of customers accounted \| Customer		0	0
Accounts Receivable [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Accounts receivable, number of major customers \| Customer		0		0
Indemnification Agreement [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Losses related to indemnification obligations		$ 0
Minimum [Member] \| Customer Concentration Risk [Member] \| Sales Revenue, Net [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Percentage outstanding for major customer		10.00%	10.00%
Minimum [Member] \| Credit Concentration Risk [Member] \| Accounts Receivable [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Percentage outstanding for major customer		10.00%		10.00%
Maximum [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Useful lives of identifiable intangible assets acquired		11 years

Summary of Significant Accounting Policies - Summary of Impact of Adopting ASC 606 on Company's Condensed Consolidated Financial Statements (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
ASSETS
Prepaid expenses and other current assets	$ 56,735		$ 52,473
Other assets	33,810		6,483
Liabilities
Deferred tax liabilities	218,507		221,407
Equity
Retained Earnings	85,849		$ 50,445
Condensed Consolidated Statement of Operations
Sales and marketing	88,215	$ 75,768
(Provision for) benefit from income taxes	(12,723)	15,871
Net income (loss)	$ 29,712	$ (18,564)
Net income (loss) per share
Basic	$ 0.57	$ (0.43)
Diluted	$ 0.56	$ (0.43)
Cash flows from operating activities
Net income	$ 29,712	$ (18,564)
Benefit from deferred income taxes	(9,353)	(16,456)
Prepaid expenses and other current assets	4,767	(6,898)
Other assets	(2,767)	88
Net cash provided by operating activities	153,973	$ 105,870
Balance Without Adoption of ASC 606 [Member]
ASSETS
Prepaid expenses and other current assets	42,684
Other assets	13,807
Liabilities
Deferred tax liabilities	210,552
Equity
Retained Earnings	59,751
Condensed Consolidated Statement of Operations
Sales and marketing	94,182
(Provision for) benefit from income taxes	(11,332)
Net income (loss)	$ 25,136
Net income (loss) per share
Basic	$ 0.48
Diluted	$ 0.47
Cash flows from operating activities
Net income	$ 25,136
Benefit from deferred income taxes	(10,744)
Prepaid expenses and other current assets	8,129
Other assets	(162)
Net cash provided by operating activities	153,973
Adjustments [Member]
ASSETS
Prepaid expenses and other current assets	(14,051)
Other assets	(20,003)
Liabilities
Deferred tax liabilities	(7,955)
Equity
Retained Earnings	(26,098)
Condensed Consolidated Statement of Operations
Sales and marketing	5,967
(Provision for) benefit from income taxes	1,391
Net income (loss)	$ (4,576)
Net income (loss) per share
Basic	$ (0.09)
Diluted	$ (0.09)
Cash flows from operating activities
Net income	$ (4,576)
Benefit from deferred income taxes	(1,391)
Prepaid expenses and other current assets	3,362
Other assets	$ 2,605

Summary of Significant Accounting Policies - Schedule of Revenue and Long-lived Assets by Geographic Areas (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 279,217	$ 187,458
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	211,754	141,178
United Kingdom [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	14,066	11,496
International - All Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 53,397	$ 34,784

Summary of Significant Accounting Policies - Schedule of Revenue by Product Grouping (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenue from External Customer [Line Items]
Revenues	$ 279,217	$ 187,458
Communications and Collaboration [Member]
Revenue from External Customer [Line Items]
Revenues	149,907	89,733
Identity and Access [Member]
Revenue from External Customer [Line Items]
Revenues	84,670	60,546
Customer Engagement And Support [Member]
Revenue from External Customer [Line Items]
Revenues	$ 44,640	$ 37,179

Summary of Significant Accounting Policies - Summary of Changes in Deferred Revenue (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Deferred Revenue Disclosure [Abstract]
Balance as of January 1, 2018	$ 340,570
Increase (decrease), net	39,574
Balance as of March 31, 2018	380,144
Balance as of January 1, 2018	6,735
Increase (decrease), net	(1,958)
Balance as of March 31, 2018	$ 4,777

- Definition

The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income.

+ References + Details

- Definition

The noncurrent portion of deferred revenue amount as of balance sheet date. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized, and is not expected to be recognized in the next twelve months. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References + Details

Summary of Significant Accounting Policies - Summary of Outstanding Forward Contracts with Notional Amounts Equivalents (Detail) - Foreign Exchange Forward [Member] - Not Designated as Hedging Instrument [Member] - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Outstanding forward contracts with notional amounts	$ 10,951,000	$ 18,698,000
Euro / Canadian Dollar [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Outstanding forward contracts with notional amounts	654,000	556,000
Euro / U.S. Dollar [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Outstanding forward contracts with notional amounts	4,961,000	4,208,000
Euro / British Pound [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Outstanding forward contracts with notional amounts	$ 5,336,000	5,926,000
Israeli Shekel / Hungarian Forint [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Outstanding forward contracts with notional amounts		$ 8,008,000

Summary of Significant Accounting Policies - Schedule of Options to Purchase Common Shares and Restricted Stock Units (Detail) shares in Thousands	3 Months Ended
	Mar. 31, 2017 shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total options and restricted stock units	2,040
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total options and restricted stock units	234
Restricted Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total options and restricted stock units	1,806

Summary of Significant Accounting Policies - Reconciliation of Basic and Diluted Net Income per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Accounting Policies [Abstract]
Net income (loss)	$ 29,712	$ (18,564)
Basic:
Weighted average common shares outstanding, basic	52,457	43,570
Net income (loss) per share, basic	$ 0.57	$ (0.43)
Diluted:
Weighted average common shares outstanding	52,457	43,570
Add: Common stock equivalents	958
Weighted average common shares outstanding, diluted	53,415	43,570
Net income (loss) per share, diluted	$ 0.56	$ (0.43)

Fair Value of Financial Instruments - Summary of Company's Significant Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Forward Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Forward contracts	$ 34	$ 29
Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	230,287	158,120
Recurring [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Forward Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Forward contracts	34	29
Recurring [Member] \| Money Market Funds [Member] \| Quoted Prices in Active Markets for Identical Items (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$ 230,287	148,120
Recurring [Member] \| Money Market Funds [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		$ 10,000

Fair Value of Financial Instruments - Summary of Company's Significant Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Parenthetical) (Detail) - Forward Contracts [Member] - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial liabilities notional amount		$ 18,700,000
Financial assets notional amount	$ 11,000,000

Acquisitions - Additional Information (Detail) $ / shares in Units, $ in Thousands, shares in Millions			3 Months Ended
	Jul. 31, 2017 USD ($) Employees	Jan. 31, 2017 USD ($) $ / shares shares	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Oct. 31, 2017 USD ($)
Business Acquisition [Line Items]
Acquisition-related costs			$ 5,100	$ 31,900
Acquisition related transaction, transition and integration-related costs			500	17,100
Acquisition related integration-related severance expenses			2,100	7,900
Acquisition related retention-based bonus payment expense			1,000	6,900
Cash paid for acquisition, net of cash acquired				(24,215)
Revenues			279,217	187,458
Amortization of acquired intangibles			41,083	24,420
Nanorep Technologies Ltd [Member]
Business Acquisition [Line Items]
Cash paid for acquisition, net of cash acquired	$ 43,200
Number of employees \| Employees	55
Revenues	$ 5,000
Minimum years of service for contingent payment	2 years
Nanorep Technologies Ltd [Member] \| Employees [Member]
Business Acquisition [Line Items]
Contingent consideration payable	$ 5,000
Citrix Systems Inc [Member]
Business Acquisition [Line Items]
Number of shares issued in connection with merger \| shares		26.9
Number of restricted stock units, issued \| shares		0.4
Closing stock price per share \| $ / shares		$ 108.10
Business combination transaction amount		$ 2,900,000
GoToBusiness [Member]
Business Acquisition [Line Items]
Contingent consideration payable					$ 3,300
Jive Communications, Inc [Member]
Business Acquisition [Line Items]
Acquisition related transaction, transition and integration-related costs			1,500
2015 and 2016 Acquisitions [Member]
Business Acquisition [Line Items]
Acquisition-related costs				1,600
GetGo, Inc. [Member]
Business Acquisition [Line Items]
Acquisition related transaction, transition and integration-related costs			2,700	30,300
Amortization of acquired intangibles			$ 56,200	$ 31,000

Acquisitions - Summary of Unaudited Pro Forma Information (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Business Acquisition [Line Items]
Revenue	$ 279,217	$ 187,458
Net income (loss)	$ 29,712	$ (18,564)
Net income (loss) per share:
Basic	$ 0.57	$ (0.43)
Diluted	$ 0.56	$ (0.43)
Weighted average shares outstanding:
Basic	52,457	43,570
Diluted	53,415	43,570
GoToBusiness [Member]
Weighted average shares outstanding:
Revenue		$ 258,400
Net income (loss)		$ 11,200
Net income (loss) per share:
Basic		$ 0.21
Diluted		$ 0.21
Weighted average shares outstanding:
Basic		52,500
Diluted		53,700

Divestitures - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Mar. 20, 2018	Mar. 31, 2018	Dec. 31, 2017
Divestitures [Line Items]
Gain on disposition of assets		$ 33,910
Xively [Member]
Divestitures [Line Items]
Proceeds from divestiture of business	$ 49,900
Proceeds from divestiture of business, net of cash divested		42,400
Cash receivables held back as an escrow by the buyer		7,500
Receivables recorded at net present value in other assets		7,200
Gain on disposition of assets		33,900
Present value received as consideration		49,600
Net assets disposed		13,300
Transaction-related cost		2,400
Goodwill		$ 14,000
Revenue			$ 3,000
GAAP expense			$ 13,000

Goodwill and Intangible Assets - Changes in Goodwill (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Goodwill [Line Items]
Beginning balance	$ 2,208,725
Foreign currency translation adjustments	(171)
Ending balance	2,194,554
Xively [Member]
Goodwill [Line Items]
Goodwill resulting from the divestiture of Xively business	$ (14,000)

Goodwill and Intangible Assets - Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,381,726	$ 1,374,294
Accumulated Amortization	281,931	224,697
Net Carrying Amount	1,099,795	1,149,597
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	813,125	810,779
Accumulated Amortization	173,781	135,715
Net Carrying Amount	$ 639,344	675,064
Intangible assets, weighted average life remaining	6 years 9 months 18 days
Completed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 452,109	453,372
Accumulated Amortization	78,973	64,021
Net Carrying Amount	$ 373,136	389,351
Intangible assets, weighted average life remaining	7 years 7 months 6 days
Trade Name and Trademark [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 70,950	70,630
Accumulated Amortization	12,656	10,073
Net Carrying Amount	$ 58,294	60,557
Intangible assets, weighted average life remaining	7 years 9 months 18 days
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 3,581	1,360
Accumulated Amortization	1,081	1,323
Net Carrying Amount	$ 2,500	37
Intangible assets, weighted average life remaining	7 years 9 months 18 days
Internally Developed Software [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 41,961	38,153
Accumulated Amortization	15,440	13,565
Net Carrying Amount	$ 26,521	$ 24,588
Intangible assets, weighted average life remaining	1 year 6 months

Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Internally developed software	$ 7.1	$ 6.0
Domain Names [Member]
Finite-Lived Intangible Assets [Line Items]
Business acquisition, Intangible assets	$ 2.5

Goodwill and Intangible Assets - Amortization Expense for Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]
Total amortization of intangibles	$ 63,362	$ 34,338
Amortization of acquired intangibles	41,083	24,420
Cost of Revenue [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Total amortization of intangibles	22,279	9,918
Amortization of acquired intangibles	17,885	9,140
Cost of Revenue [Member] \| Internally Developed Software [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Total amortization of intangibles	$ 4,394	$ 778

Goodwill and Intangible Assets - Amortization Expense for Intangible Assets (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Amortization Expense Of Intangible Assets [Abstract]
Amortization of acquired intangibles	$ 59.0	$ 33.6

Goodwill and Intangible Assets - Future Estimated Amortization Expense (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2018 (nine months ending December 31)	$ 191,887
2019	237,123
2020	198,025
2021	161,944
2022	126,319
Thereafter	184,497
Net Carrying Amount	$ 1,099,795	$ 1,149,597

Accrued Liabilities - Summary of Accrued Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Payables and Accruals [Abstract]
Marketing programs	$ 11,067	$ 6,883
Payroll and payroll-related	36,599	30,204
Professional fees	5,520	5,353
Acquisition-related	5,808	6,783
Other accrued liabilities	50,678	33,203
Total accrued liabilities	$ 109,672	$ 82,426

Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Income Taxes [Line Items]
(Provision for) benefit from income taxes	$ (12,723,000)		$ 15,871,000
Income (loss) before income taxes	$ 42,435,000		$ (34,435,000)
Effective income tax rates	30.00%		46.00%
Gain on disposition of assets	$ 33,910,000
One-time mandatory transition tax on cumulative foreign subsidiary earnings	15,500,000	$ 14,800,000
Tax provision (benefit) due to remeasurement of deferred tax assets and liabilities		(105,100,000)
Tax provision (benefit) due to reassessment of net realizability of deferred tax assets and liabilities		4,700,000
Tax provision due to remeasurement of U.S. deferred tax assets and liabilities	700,000	14,800,000
Uncertain tax positions	5,600,000	$ 5,100,000
Interest expense	25,000		$ 14,000
Discrete Integration Related Activity [Member]
Income Taxes [Line Items]
(Provision for) benefit from income taxes	(1,400,000)		2,300,000
Effective income tax rates, excess benefit on stock compensation	1,700,000		$ 2,300,000
Xively [Member]
Income Taxes [Line Items]
(Provision for) benefit from income taxes	(9,200,000)
Gain on disposition of assets	$ 33,900,000

Common Stock and Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended					12 Months Ended
	Feb. 28, 2018	Feb. 23, 2017	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2017
Equity [Abstract]
Capital return plan term		3 years
Cash dividend per common stock paid	$ 0.30		$ 0.30	$ 0.25	$ 0.25	$ 0.25	$ 0.50	$ 1.25
Dividend paid date		Feb. 28, 2018
Dividend paid, stockholders on record date		Feb. 12, 2018
Capital return through share repurchases and dividends		$ 700.0
Number of shares repurchased			404,022				76,660
Average price of repurchased shares			$ 121.38				$ 97.38
Total cost of shares repurchased			$ 49.0				$ 7.5

Common Stock and Equity - Summary of Dividend Declared and Paid (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended					12 Months Ended
	Feb. 28, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2017
Equity [Abstract]
Dividends per share	$ 0.30	$ 0.30	$ 0.25	$ 0.25	$ 0.25	$ 0.50	$ 1.25
Dividends paid on common stock		$ 15,738	$ 13,200	$ 13,200	$ 13,200	$ 12,780	$ 52,400

Stock Incentive Plan - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended	3 Months Ended
	Jan. 31, 2017	Feb. 28, 2017	Mar. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of additional shares approved	4,500,000
Shares available for grant			7,300,000
Fair value of common stock			$ 115.55	$ 114.50
Unrecognized share-based compensation cost			$ 84.3
Share-based compensation cost not yet recognized period for recognition			1 year 9 months 18 days
Time-based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period of options vested			3 years
Number of restricted stock units, granted			17,625
Time-based Restricted Stock Units [Member] \| Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period of options vested		2 years
Number of additional restricted stock units, earned and vested			18,750
Percentage of performance earned units		200.00%
Number of restricted stock units, outstanding			101,988
Time-based Restricted Stock Units [Member] \| Minimum [Member] \| Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			0.00%
Requisite service period of compensation expense			2 years
Time-based Restricted Stock Units [Member] \| Maximum [Member] \| Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			200.00%
Requisite service period of compensation expense			3 years
Market Based Restricted Stock Units (RSUs) [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period of options vested			2 years
Market Based Restricted Stock Units (RSUs) [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period of options vested			3 years
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period of options vested			4 years
Period of expiration			10 years
Performance Based Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock units, outstanding			81,915

Stock Incentive Plan - Summary of Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Number of shares, Outstanding, Beginning balance	172,000
Number of shares, Granted	0
Number of shares, Exercised	(3,000)
Number of shares, Forfeited	0
Number of shares, Outstanding, Ending balance	169,000	172,000
Weighted Average Exercise Price, Outstanding, Beginning balance	$ 30.33
Weighted Average Exercise Price, Granted	0
Weighted Average Exercise Price, Exercised	18.34
Weighted Average Exercise Price, Forfeited	0
Weighted Average Exercise Price, Outstanding, Ending balance	$ 30.57	$ 30.33
Weighted Average Remaining Contractual Term (Years), Outstanding	3 years 4 months 24 days	3 years 8 months 11 days
Aggregate Intrinsic Value, Outstanding, Beginning balance	$ 14,520
Aggregate Intrinsic Value, Exercised	352
Aggregate Intrinsic Value, Outstanding, Ending balance	$ 14,366	$ 14,520

Stock Incentive Plan - Schedule of Restricted Stock Unit Activity Including Market-based Units (Detail) - Restricted Stock Units RSU and Market Based TSR Units [Member] shares in Thousands	3 Months Ended
	Mar. 31, 2018 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares Underlying Restricted Stock Units, Unvested, Beginning balance	1,689
Number of Shares Underlying Restricted Stock Units, granted	18
Number of Shares Underlying Restricted Stock Units, earned	19
Number of Shares Underlying Restricted Stock Units, vested	(277)
Number of Shares Underlying Restricted Stock Units, forfeited	(63)
Number of Shares Underlying Restricted Stock Units, Unvested, Ending balance	1,386
Unvested as of January 1, 2018 \| $ / shares	$ 90.91
Restricted stock units granted \| $ / shares	116.65
Restricted stock units vested \| $ / shares	74.43
Restricted stock units forfeited \| $ / shares	83.65
Unvested as of March 31, 2018 \| $ / shares	$ 94.47

Stock Incentive Plan - Schedule of Stock Based Compensation Allocated to Expense (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	$ 15,966	$ 14,194
Cost of Revenue [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	1,216	1,014
Research and Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	4,943	4,429
Sales and Marketing [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	3,695	3,606
General and Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	$ 6,112	$ 5,145

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Rent expense under all leases	$ 5.1	$ 4.7
Aggregate hosting fees incurred	$ 9.0	$ 7.9

Commitments and Contingencies - Schedule of Minimum Future Lease Payments Receivable (Detail) $ in Thousands	Mar. 31, 2018 USD ($)
Leases [Abstract]
2018	$ 34,255
2019	32,472
2020	26,177
2021	19,840
2022	14,578
Thereafter	34,694
Total minimum lease payments	$ 162,016

Accumulated Other Comprehensive Income (Loss) - Additional Information (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss)	$ 21,027	$ 15,570
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss)	$ 21,000	$ 15,600
Percentage of current and prior year earnings	100.00%

Credit Facility - Additional Information (Detail) - Revolving Facility [Member] - Secured Debt [Member] - Multi Currency Credit Agreement [Member] - USD ($)			3 Months Ended
	Feb. 01, 2017	Feb. 18, 2015	Mar. 31, 2018	Jan. 06, 2016
Line of Credit Facility [Line Items]
Line of credit facility, expiration date		Feb. 01, 2022
Additional credit facility subject to further commitment upon exercise of option	$ 200,000,000
Maximum amount of borrowing	$ 400,000,000			$ 150,000,000
Line of Credit Facility, Amount Outstanding			$ 0
Other Assets [Member]
Line of Credit Facility [Line Items]
Capitalized origination costs			$ 2,100,000
Minimum [Member]
Line of Credit Facility [Line Items]
Variable interest rate reset period			30 days
Credit facility commitment fees			0.15%
Maximum [Member]
Line of Credit Facility [Line Items]
Variable interest rate reset period			180 days
Credit facility commitment fees			0.30%

Subsequent Events - Additional Information (Detail) $ / shares in Units, $ in Millions					3 Months Ended		12 Months Ended
	Apr. 24, 2018 $ / shares	Apr. 03, 2018 USD ($) Employee	Apr. 02, 2018 USD ($)	Feb. 23, 2017	Mar. 31, 2018 $ / shares	Mar. 31, 2017 $ / shares	Dec. 31, 2017 USD ($)
Subsequent Event [Line Items]
Cash dividends declared per common share \| $ / shares					$ 0.30	$ 0.75
Date of dividend payable				Feb. 28, 2018
Jive Communications, Inc [Member]
Subsequent Event [Line Items]
Revenue of acquiree							$ 80
Subsequent Event [Member]
Subsequent Event [Line Items]
Cash dividends declared per common share \| $ / shares	$ 0.30
Date of dividend payable	May 25, 2018
Subsequent Event [Member] \| Revolving Facility [Member]
Subsequent Event [Line Items]
Line of Credit Facility, Amount Outstanding			$ 200
Line of credit interest rate			3.19%
Subsequent Event [Member] \| Jive Communications, Inc [Member]
Subsequent Event [Line Items]
Cash consideration		$ 342
Cash payable in contingent consideration		15
Borrowings under credit facility		$ 200
Number of employees in acquiree \| Employee		700
Maturity period for contingent payment		2 years
Business acquisition agreement date		Feb. 07, 2018