Document and Entity Information Document - shares	6 Months Ended
Document and Entity Information Document - shares	Jun. 30, 2018	Jul. 25, 2018
Entity [Abstract]
Entity Registrant Name	TRUPANION, INC.
Entity Central Index Key	0001371285
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		32,776,401

Consolidated Statement of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Revenue	$ 73,392	$ 58,275	$ 143,152	$ 113,004
Cost of Revenue [Abstract]
Veterinary invoice expense	51,780	41,009	101,893	80,196
Other cost of revenue	9,259	6,915	17,842	13,302
Gross profit	12,353	10,351	23,417	19,506
Operating Expenses [Abstract]
Technology and Development	2,298	2,322	4,462	4,725
General and administrative	4,610	4,245	9,068	8,257
Sales and marketing	5,702	4,372	11,640	8,461
Total operating expenses	12,610	10,939	25,170	21,443
Operating loss	(257)	(588)	(1,753)	(1,937)
Interest expense	332	109	551	246
Other (income) expense, net	(303)	(1,112)	(443)	(1,140)
Income (Loss) before income taxes	(286)	415	(1,861)	(1,043)
Income tax expense (benefit)	91	4	(4)	28
Net (loss) income	$ (377)	$ 411	$ (1,857)	$ (1,071)
Net income (loss) per share [Abstract]
Earnings Per Share, Basic and Diluted	$ (0.01)	$ 0.01	$ (0.06)	$ (0.04)
Weighted Average Number of Shares Outstanding, Basic	30,721,037	29,510,907	30,485,121	29,383,502
Weighted Average Number of Shares Outstanding, Diluted	30,721,037	32,734,624	30,485,121	29,383,502

Consolidated Statement of Comprehensive Income Statement - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (377)	$ 411	$ (1,857)	$ (1,071)
Foreign currency translation adjustments	(129)	111	(319)	123
Net unrealized gain on available-for-sale debt securities	15	16	0	9
Other comprehensive (loss) income, net of taxes	(114)	127	(319)	132
Comprehensive Income (Loss)	$ (491)	$ 538	$ (2,176)	$ (939)

Consolidated Balance Sheet - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Assets [Abstract]
Cash and cash equivalents	$ 95,424	$ 25,706
Short-term Investments	42,802	37,590
Accounts and other receivables	28,552	20,367
Prepaid expenses and other assets	6,890	2,895
Total current assets	173,668	86,558
Restricted Cash	1,400	600
Long-Term Investments, at fair value	3,311	3,237
Property and equipment, net	8,208	7,868
Intangible assets, net	5,158	4,972
Other Long-Term Assets	2,554	2,624
Total assets	194,299	105,859
Liabilities and Equity [Abstract]
Accounts payable	2,373	2,716
Accrued liabilities and other current liabilities	10,424	7,660
Reserve for veterinary invoices	13,996	12,756
Deferred Revenue	30,339	22,734
Total current liabilities	57,132	45,866
Long-term debt	18,628	9,324
Deferred tax liabilities	1,002	1,002
Other liabilities	1,285	1,233
Total liabilities	78,047	57,425
Common stock	0	0
Preferred Stock	0	0
Additional paid-in capital	207,505	134,511
Accumulated other comprehensive loss	(411)	(92)
Accumulated deficit	(84,641)	(82,784)
Treasury stock, at cost	(6,201)	(3,201)
Stockholders' Equity Attributable to Parent	116,252	48,434
Total liabilities and stockholders' equity	$ 194,299	$ 105,859

Consolidated Balance Sheet Condensed Consolidated Balance Sheet Parentheticals - $ / shares	Jun. 30, 2018	Dec. 31, 2017
Common Stock [Member]
Common Stock, Par or Stated Value Per Share	$ 0.00001	$ 0.00001
Common Stock, Shares Authorized	100,000,000	100,000,000
Common Stock, Shares, Issued	33,475,275	30,778,796
Common Stock, Shares, Outstanding	32,719,290	30,121,496
Preferred Stock [Member]
Preferred Stock, Par or Stated Value Per Share	$ 0.00001	$ 0.00001
Preferred Stock, Shares Authorized	10,000,000	10,000,000
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0
Treasury Stock [Member]
Treasury Stock, Shares	755,985	657,300

Consolidated Statement of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Net Cash Provided by Operating Activities [Abstract]
Net loss	$ (1,857)	$ (1,071)
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Depreciation and Amortization	1,891	2,113
Stock-based compensation expense	2,254	1,669
Gain (Loss) on Sale of Equity Investments	0	1,036
Other, Net	38	56
Increase (Decrease) in Operating Assets [Abstract]
Accounts and other receivables	(8,168)	(6,968)
Prepaid expenses and other assets	(4,068)	(183)
Accounts Payable, Accrued Liabilities, and Other Liabilities	2,567	913
Claims Reserve	1,293	1,259
Deferred revenue	7,661	6,929
Net cash provided by operating activities	1,611	3,681
Payments to Acquire Investments	20,386	14,895
Net Cash Provided by Investing Activities [Abstract]
Maturities of Investment Securities	15,015	11,712
Proceeds from Sale of Equity Method Investments	0	1,402
Purchases of property and equipment	(2,370)	(1,264)
Other Investments	113	(2,753)
Proceeds from Issuance or Sale of Equity	65,886	0
Net cash used in investing activities	(7,628)	(5,798)
Net Cash Provided by Financing Activities [Abstract]
Proceeds from Issuance or Sale of Equity	65,886	0
Proceeds from exercise of stock options	1,656	1,647
Proceeds from Warrant Exercises	300	0
Proceeds from Debt financing, net of financing fees	9,250	1,459
Proceeds from (Payments for) Other Financing Activities	(356)	(203)
Net cash provided by financing activities	76,736	2,903
Effect of foreign exchange rate changes on cash, cash equivalents, and restricted cash, net	(201)	181
Net Increase in Cash, Cash Equivalents, and Restricted Cash	70,518	967
Cash, Cash Equivalents, and Restricted Cash at beginning of period	26,306	24,237
Cash, Cash Equivalents, and Restricted Cash, End of Period	96,824	25,204
Supplemental Cash Flow Information [Abstract]
Purchases of property and equipment included in accounts payable and accrued liabilities	153	352
Property and Equipment Acquired Under Capital Leases	0	66
Redemption of Warrants Non-Cash; Common Stock	$ 3,000	$ 0

Nature of Operations and Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Operations and Summary of Significant Accounting Policies	Nature of Operations and Significant Accounting Policies Description of Business and Basis of Presentation Trupanion, Inc. (collectively with its wholly-owned subsidiaries, the Company) provides medical insurance for cats and dogs throughout the United States, Canada and Puerto Rico. The financial data as of December 31, 2017 was derived from the Company's audited consolidated financial statements. The accompanying unaudited interim consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (GAAP) and, in management's opinion, have been prepared on the same basis as the audited financial statements and include all adjustments, consisting of normal recurring adjustments, necessary for the fair presentation of the Company's financial position, results of operations, comprehensive (loss) income, and cash flows for the interim periods. These unaudited interim consolidated financial statements should be read in conjunction with the Company’s audited financial statements included in the Company’s Annual Report on Form 10-K, filed with the U.S Securities and Exchange Commission (SEC) on February 13, 2018 (the 2017 10-K). The Company's accounting policies are described in Note 1 to the audited financial statements included in the 2017 10-K. Operating results for the three and six months ended June 30, 2018 are not necessarily indicative of the results that may be expected for the full fiscal year or any other interim period. Follow-on Public Offering In June 2018, the Company completed a follow-on public offering (the June 2018 follow-on public offering) whereby the Company sold 2,090,909 shares of common stock (inclusive of 272,727 shares of common stock sold by the Company pursuant to the full exercise of the underwriters' option to purchase additional shares) at a price to the public of $33.00 per share. The Company received aggregate net proceeds from the June 2018 follow-on public offering of $65.9 million, after deducting underwriting discounts and commissions and offering expenses payable by the Company. Use of Estimates The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from such estimates. See Note 1 to the audited financial statements included in the 2017 10-K for additional discussion of these estimates and assumptions. Accumulated Other Comprehensive Loss There were no reclassifications out of accumulated other comprehensive loss during the three and six months ended June 30, 2018 and 2017. Income Taxes On December 22, 2017, the U.S. government enacted the Tax Cuts and Jobs Act (Tax Act), making broad and complex changes to the Internal Revenue Code. The Company has made significant judgments and estimates in accordance with its interpretation of the Tax Act. As additional guidance on the Tax Act becomes available, the Company may adjust its interpretation of the requirements, which may result in a material change to income tax benefit or expense in the period in which the adjustment is made. Recent Accounting Pronouncements In February 2016, the Financial Accounting Standards Board (FASB) issued an Accounting Standards Update (ASU) amending the lease presentation guidance. The ASU requires organizations that lease assets to recognize the rights and obligations created by those leases on the consolidated balance sheets. This ASU is effective for fiscal years beginning after December 15, 2018 including interim periods within that reporting period, with early adoption permitted. The Company has determined this guidance will require recognition of a lease liability and corresponding asset on the consolidated balance sheets equal to the present value of minimum lease payments. The carrying amount of the asset is derived from the amount of the lease liability at the end of each reporting period. The Company plans to adopt this guidance as of January 1, 2019, and is in the process of evaluating the impact on its consolidated financial statements.

Net Loss per Share

6 Months Ended

Jun. 30, 2018

Earnings Per Share, Basic and Diluted [Abstract]

Earnings Per Share [Text Block]

Net (Loss) Income per Share

Basic net (loss) income per share is computed using the weighted average number of shares of common stock outstanding during the period. Diluted net (loss) income per share is calculated using the weighted average number of shares of common stock plus, when dilutive, potential common shares outstanding using the treasury-stock method. Potential common shares outstanding include stock options, unvested restricted stock awards and restricted stock units, and warrants.

The components of basic and diluted earnings per share were as follows:



	Three Months Ended June 30,					Six Months Ended June 30,
	2018			2017		2018			2017
Basic earnings per share:
Net (loss) income	$	(377	)	$	411	$	(1,857	)	$	(1,071	)
Shares used in computation:
Weighted average common shares outstanding	30,721,037			29,510,907		30,485,121			29,383,502
Basic earnings per share	$	(0.01	)	$	0.01	$	(0.06	)	$	(0.04	)

Diluted earnings per share:
Net (loss) income	$	(377	)	$	411	$	(1,857	)	$	(1,071	)
Shares used in computation:
Weighted average common shares outstanding	30,721,037			29,510,907		30,485,121			29,383,502
Stock options	—			2,511,012		—			—
Restricted stock awards and units	—			351,668		—			—
Warrants	—			361,037		—			—
Weighted average number of shares	30,721,037			32,734,624		30,485,121			29,383,502
Diluted earnings per share	$	(0.01	)	$	0.01	$	(0.06	)	$	(0.04	)

The following potentially dilutive equity securities were not included in the diluted earnings per common share calculation because they would have had an antidilutive effect:



	Three Months Ended June 30,		Six Months Ended June 30,
	2018	2017	2018	2017
Stock options	3,696,242	1,035,163	3,696,242	4,207,577
Restricted stock awards and restricted stock units	555,984	—	555,984	351,668
Warrants	480,000	—	480,000	810,000

Investment Securities (Notes)

6 Months Ended

Jun. 30, 2018

Investments [Abstract]

Investment [Text Block]

Investment Securities

The amortized cost, gross unrealized holding gains and losses, fair value of long-term investments, which are classified as available-for-sale, and fair value of short-term investments by major security type and class of security were as follows as of June 30, 2018 and December 31, 2017 (in thousands):



	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses			Fair Value
As of June 30, 2018
Available-for-sale:
Foreign deposits	$	2,311	$	—	$	—		$	2,311
Municipal bond	1,000		—		—			1,000
	$	3,311	$	—	$	—		$	3,311
Short-term investments:
U.S. Treasury securities	$	6,231	$	—	$	(2	)	$	6,229
Certificates of deposit	439		—		—			439
U.S. government funds	36,132		—		—			36,132
	$	42,802	$	—	$	(2	)	$	42,800

	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses			Fair Value
As of December 31, 2017
Available-for-sale:
Foreign deposits	$	2,237	$	—	$	—		$	2,237
Municipal bond	1,000		—		—			1,000
	$	3,237	$	—	$	—		$	3,237
Short-term investments:
U.S. Treasury securities	$	5,783	$	—	$	(4	)	$	5,779
Certificates of deposit	690		1		—			691
U.S. government funds	31,117		—		—			31,117
	$	37,590	$	1	$	(4	)	$	37,587

Maturities of debt securities classified as available-for-sale were as follows (in thousands):



	June 30, 2018
	Amortized Cost		Fair Value
Available-for-sale:
Due after one year through five years	$	2,311	$	2,311
Due after five years through ten years	1,000		1,000
	$	3,311	$	3,311

The Company evaluated its securities for other-than-temporary impairment and considers the decline in market value for the securities to be primarily attributable to current economic and market conditions. For debt securities, the Company does not intend to sell, nor is it more likely than not that the Company will be required to sell, the securities prior to maturity or prior to the recovery of the amortized cost basis.

Investments [Text Block]

The amortized cost, gross unrealized holding gains and losses, fair value of long-term investments, which are classified as available-for-sale, and fair value of short-term investments by major security type and class of security were as follows as of June 30, 2018 and December 31, 2017 (in thousands):



	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses			Fair Value
As of June 30, 2018
Available-for-sale:
Foreign deposits	$	2,311	$	—	$	—		$	2,311
Municipal bond	1,000		—		—			1,000
	$	3,311	$	—	$	—		$	3,311
Short-term investments:
U.S. Treasury securities	$	6,231	$	—	$	(2	)	$	6,229
Certificates of deposit	439		—		—			439
U.S. government funds	36,132		—		—			36,132
	$	42,802	$	—	$	(2	)	$	42,800

	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses			Fair Value
As of December 31, 2017
Available-for-sale:
Foreign deposits	$	2,237	$	—	$	—		$	2,237
Municipal bond	1,000		—		—			1,000
	$	3,237	$	—	$	—		$	3,237
Short-term investments:
U.S. Treasury securities	$	5,783	$	—	$	(4	)	$	5,779
Certificates of deposit	690		1		—			691
U.S. government funds	31,117		—		—			31,117
	$	37,590	$	1	$	(4	)	$	37,587

Fair Value

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Fair Value Disclosures [Text Block]

Fair Value

Investments

The following table summarizes, by major security type, the Company's assets that are measured at fair value on a recurring basis, and placement within the fair value hierarchy (in thousands):



	As of June 30, 2018
	Fair Value		Level 1		Level 2
Assets
Restricted cash	$	1,400	$	1,400	$	—
Foreign deposits	2,311		2,311		—
Municipal bond	1,000		—		1,000
Money market funds	45,420		45,420		—
Total	$	50,131	$	49,131	$	1,000

	As of December 31, 2017
	Fair Value		Level 1		Level 2
Assets
Restricted cash	$	600	$	600	$	—
Foreign deposits	2,237		2,237		—
Municipal bond	1,000		—		1,000
Money market funds	5,167		5,167		—
Total	$	9,004	$	8,004	$	1,000

The Company measures the fair value of restricted cash, foreign deposits, and money market funds based on quoted prices in active markets for identical assets. The fair value of the municipal bond is based on either recent trades in inactive markets or quoted market prices of similar instruments and other significant inputs derived from or corroborated by observable market data. Short-term investments are carried at amortized cost and the fair value is disclosed in Note 3, Investment Securities. The fair value of these investments is determined in the same manner as for available-for-sale securities and is considered a Level 1 measurement.

Fair Value Disclosures

As of June 30, 2018 and December 31, 2017, the Company's other long-term assets balance included a $2.5 million note receivable, recorded at its estimated collectible amount. The Company estimates that the carrying value of the note receivable approximates its fair value. The estimated fair value represents a Level 3 measurement within the fair value hierarchy, and is based on market interest rates and the assessed creditworthiness of the third party.

The Company estimates the fair value of its long-term debt based upon rates currently available to the Company for debt with similar terms and remaining maturities. This is a Level 3 measurement. Based upon the terms of the debt, the carrying amount of long-term debt approximated fair value at June 30, 2018 and December 31, 2017.

- 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

Debt	6 Months Ended
Debt	Jun. 30, 2018
Debt Disclosure [Abstract]
Debt Disclosure [Text Block]	Debt On June 28, 2018, the Company amended its credit agreement, increasing its borrowing capacity from $30.0 million to $50.0 million, extending the maturity date to June 2021, and increasing the required amount of restricted cash. The facility is secured by any and all interests in the Company's assets that are not otherwise restricted. Interest on the revolving line of credit is payable monthly at the greater of 4.5%, or 1.25% plus the prime rate (6.25% at June 30, 2018). The credit agreement includes other ancillary services and letters of credit of up to $4.5 million, and requires a deposit of restricted cash of $1.4 million. As of June 30, 2018, the Company was in compliance with all financial and non-financial covenants required by the credit agreement. Borrowings on the revolving line of credit are limited to the lesser of $50.0 million and the total amount of cash and securities held by the Company's insurance subsidiaries (American Pet Insurance Company and Wyndham Insurance Company (SAC) Limited Segregated Account AX). As of June 30, 2018, available borrowing capacity on the line of credit was $20.2 million, with an outstanding balance of $1.9 million for ancillary services and letters of credit, and borrowings under the facility of $18.8 million, recorded net of financing fees of $0.2 million.

Commitment and Contingencies	6 Months Ended
Commitment and Contingencies	Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Disclosure [Text Block]	Commitments and Contingencies Litigation From time to time, the Company is subject to litigation matters and claims arising from the ordinary course of business. The Company records a provision for a liability relating to legal matters when it is both probable that a material liability has been incurred and the amount of the loss can be reasonably estimated. At this time, the Company does not believe any such matters to be material individually or in the aggregate. These views are subject to change following the outcome of future events or the results of future developments. Agreement for the Purchase of Corporate Headquarters In June 2018, the Company entered into a Real Estate Purchase and Sale Agreement (Real Estate Purchase Agreement) with Benaroya Capital Company, L.L.C to purchase certain properties (Properties) as defined within the Real Estate Purchase Agreement, located at 6100 Fourth Avenue South, Seattle, Washington. The purchase price will consist of $55.0 million in cash and 303,030 shares of common stock. The Company currently leases a portion of the Properties for use as its corporate headquarters and has recognized $1.0 million of rent expense under this lease for the six months ended June 30, 2018. Pursuant to this agreement, in June 2018, the Company made a $3.3 million earnest money deposit into an escrow account that, subject to limited exceptions, is non-refundable but creditable toward the purchase price of the Properties upon closing. Portions of the Properties are leased by unrelated parties, and the Company will assume those leases as part of its purchase. The closing date will be no later than January 1, 2019, and is subject to routine contingencies as provided in the Real Estate Purchase Agreement.

Claims Reserve

6 Months Ended

Jun. 30, 2018

Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]

Supplementary Insurance Information, for Insurance Companies Disclosure [Text Block]

Reserve for Veterinary Invoices

The reserve for veterinary invoices is an estimate of the future amount the Company will pay for veterinary invoices that are dated as of, or prior to, its balance sheet date. The reserve also includes the Company's estimate of related internal processing costs. The reserve estimate involves actuarial projections, and is based on management's assessment of facts and circumstances currently known, and assumptions about anticipated patterns, including expected future trends in the number of veterinary invoices the Company will receive and the average cost of those veterinary invoices. The reserve is made for each of the Company's segments, subscription and other business, and are continually refined as the Company receives and pays veterinary invoices. Changes in management's assumptions and estimates may have a relatively large impact to the reserve and associated expense.

Reserve for veterinary invoices

Summarized below are the changes in the total liability for the Company's subscription business segment (in thousands):



	Six Months Ended June 30,
Subscription	2018		2017
Reserve at beginning of year	$	11,059	$	8,538
Veterinary invoices during the period related to:
Current year	91,464		74,244
Prior years	119		(257		)
Total veterinary invoice expense	91,583		73,987
Amounts paid during the period related to:
Current year	80,841		65,549
Prior years	9,256		7,138
Total paid	90,097		72,687
Non-cash expenses	333		229
Reserve at end of period	$	12,212	$	9,609

The Company's reserve for the subscription business segment increased from $11.1 million at December 31, 2017 to $12.2 million at June 30, 2018. This change was comprised of $91.6 million in expense recorded during the period less $90.1 million in payments of veterinary invoices. The $91.6 million in veterinary invoice expense incurred includes an adjustment of $0.1 million to the reserves relating to prior years, which is the result of ongoing analysis of recent payment trends. For the six months ended June 30, 2017, the Company decreased prior year reserves by $0.3 million as a result of analysis of payment trends.

Summarized below are the changes in total liability for the Company's other business segment (in thousands):



	Six Months Ended June 30,
Other Business	2018			2017
Reserve at beginning of year	$	1,697		$	983
Veterinary invoices during the period related to:
Current year	10,589			6,337
Prior years	(279		)	(128		)
Total veterinary invoice expense	10,310			6,209
Amounts paid during the period related to:
Current year	8,916			5,217
Prior years	1,307			764
Total paid	10,223			5,981
Non-cash expenses	—			—
Reserve at end of period	$	1,784		$	1,211

The Company’s reserve for the other business segment increased from $1.7 million at December 31, 2017 to $1.8 million at June 30, 2018. This change was comprised of $10.3 million in expense recorded during the period less $10.2 million in payments of veterinary invoices. The $10.3 million in veterinary invoice expense incurred includes a reduction of $0.3 million to the reserves relating to prior years, which is the result of ongoing analysis of recent payment trends. For the six months ended June 30, 2017, the Company decreased prior year reserves by $0.1 million as a result of analysis of payment trends.

Reserve for veterinary invoices, by year of occurrence

In the following tables, the reserve for veterinary invoices for each segment is presented as the amount (in thousands) by year the veterinary invoice relates to, referred to as the year of occurrence.



Subscription	As of June 30, 2018
Year of Occurrence
2016	$	386
2017	1,537
2018	10,289
	$	12,212



Other Business	As of June 30, 2018
Year of Occurrence
2017	$	110
2018	1,674
	$	1,784

Stock-based Compensation

6 Months Ended

Jun. 30, 2018

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

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

Stock-Based Compensation and Stockholders' Equity

Stock-based Compensation

Stock-based compensation expense includes stock options, restricted stock awards, and restricted stock units granted to employees and non-employees and has been reported in the Company’s consolidated statements of operations depending on the function performed by the employee or non-employee. Stock-based compensation expense recognized in the consolidated statements of operations was as follows (in thousands):



	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Veterinary invoice expense	$	148	$	89	$	268	$	159
Other cost of revenue	104		60		181		103
Technology and development	60		59		109		109
General and administrative	625		482		1,074		913
Sales and marketing	349		198		622		385
Total stock-based compensation	$	1,286	$	888	$	2,254	$	1,669

As of June 30, 2018, for all employees, the Company had 683,338 unvested stock options and 555,984 unvested restricted stock awards and restricted stock units that are expected to vest. Stock-based compensation expense of $4.3 million related to unvested stock options and $8.4 million related to unvested restricted stock awards and restricted stock units, each expected to be recognized over a weighted average period of approximately 2.3 years.

Stock Options

A summary of the Company's stock option activity is as follows:



	Number Of Options		Weighted Average Exercise Price per Share		Aggregate Intrinsic Value (in thousands)
Outstanding as of December 31, 2017	4,006,399		$	7.16	$	88,578
Granted	—		—
Exercised	(262,967	)	6.30		6,681
Forfeited	(47,190	)	15.44
Outstanding as of June 30, 2018	3,696,242		$	7.12	$	116,370

Exercisable as of June 30, 2018	3,008,570		$	5.22	$	100,432

As of June 30, 2018, stock options outstanding and stock options exercisable had a weighted average remaining contractual life of 4.8 years and 4.1 years, respectively.

Restricted Stock Awards and Restricted Stock Units

A summary of the Company’s restricted stock award and restricted stock unit activity is as follows:



	Number of Shares		Weighted Average Grant Date Fair Value per Share
Unvested shares as of December 31, 2017	256,842		$	4.77
Granted	323,358		27.87
Vested	(12,603	)	26.85
Forfeited	(11,613	)	28.36
Unvested shares as of June 30, 2018	555,984		$	18.27

Stockholders’ Equity

In the June 2018 follow-on public offering, the Company sold 2,090,909 shares of common stock (inclusive of 272,727 shares of common stock sold by the Company pursuant to the full exercise of the underwriters' option to purchase additional shares) at a price to the public of $33.00 per share. The Company received aggregate net proceeds of $65.9 million, after deducting underwriting discounts and commissions and offering expenses payable by the Company.

During the six months ended June 30, 2018, 330,000 of the Company's outstanding warrants were exercised. As of June 30, 2018, warrants to purchase 480,000 shares of the Company's common stock at $10.00 per share remained outstanding. The warrants automatically convert to common stock in 2019.

Segments

6 Months Ended

Jun. 30, 2018

Segment Reporting [Abstract]

Segment Reporting Disclosure [Text Block]

Segments

The Company has two segments: subscription business and other business. The subscription business segment includes monthly subscription fees related to the Company’s medical insurance which is marketed directly to consumers, while the other business segment includes all other business that is not directly marketed to consumers.

The chief operating decision maker uses two measures to evaluate segment performance: revenue and gross profit. Additionally, other operating expenses, such as sales and marketing expenses, are allocated to each segment and evaluated when material. Interest and other expenses and income taxes are not allocated to the segments, nor included in the measure of segment profit or loss. The Company does not analyze discrete segment balance sheet information related to long-term assets.

Revenue and gross profit of the Company’s segments were as follows (in thousands):



	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
Revenue:
Subscription business	$	63,867		$	52,641		$	125,384		$	102,870
Other business	9,525			5,634			17,768			10,134
	73,392			58,275			143,152			113,004
Veterinary invoice expense:
Subscription business	46,446			37,664			91,583			73,987
Other business	5,334			3,345			10,310			6,209
	51,780			41,009			101,893			80,196
Other cost of revenue:
Subscription business	5,887			4,927			11,764			9,850
Other business	3,372			1,988			6,078			3,452
	9,259			6,915			17,842			13,302
Gross profit:
Subscription business	11,534			10,050			22,037			19,033
Other business	819			301			1,380			473
	12,353			10,351			23,417			19,506

Technology and development	2,298			2,322			4,462			4,725
General and administrative	4,610			4,245			9,068			8,257
Sales and marketing:
Subscription business	5,614			4,309			11,465			8,350
Other business	88			63			175			111
	5,702			4,372			11,640			8,461
Operating loss	$	(257	)	$	(588	)	$	(1,753	)	$	(1,937	)

The following table presents the Company’s revenue by geographic region of the member (in thousands):



	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
United States	$	59,431	$	47,306	$	115,440	$	91,440
Canada	13,961		10,969		27,712		21,564
Total revenue	$	73,392	$	58,275	$	143,152	$	113,004

Substantially all of the Company’s long-lived assets were located in the United States as of June 30, 2018 and December 31, 2017.

Subsequent Events (Notes)	6 Months Ended
Subsequent Events (Notes)	Jun. 30, 2018
Subsequent Events [Abstract]
Subsequent Events [Text Block]	Subsequent EventsOn July 18, 2018, the Company purchased an equity interest, as a limited partner, in a privately held corporation for approximately $3.0 million. The Company has a contingent commitment to purchase an additional $4.0 million of equity for eighteen months following the initial investment. In conjunction with the investment, the Company has extended a revolving line of credit with a maximum borrowing capacity of $2.5 million.

Nature of Operations and Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business Description and Basis of Presentation [Text Block]	Description of Business and Basis of Presentation Trupanion, Inc. (collectively with its wholly-owned subsidiaries, the Company) provides medical insurance for cats and dogs throughout the United States, Canada and Puerto Rico. The financial data as of December 31, 2017 was derived from the Company's audited consolidated financial statements. The accompanying unaudited interim consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (GAAP) and, in management's opinion, have been prepared on the same basis as the audited financial statements and include all adjustments, consisting of normal recurring adjustments, necessary for the fair presentation of the Company's financial position, results of operations, comprehensive (loss) income, and cash flows for the interim periods. These unaudited interim consolidated financial statements should be read in conjunction with the Company’s audited financial statements included in the Company’s Annual Report on Form 10-K, filed with the U.S Securities and Exchange Commission (SEC) on February 13, 2018 (the 2017 10-K). The Company's accounting policies are described in Note 1 to the audited financial statements included in the 2017 10-K. Operating results for the three and six months ended June 30, 2018 are not necessarily indicative of the results that may be expected for the full fiscal year or any other interim period. Follow-on Public Offering In June 2018, the Company completed a follow-on public offering (the June 2018 follow-on public offering) whereby the Company sold 2,090,909 shares of common stock (inclusive of 272,727 shares of common stock sold by the Company pursuant to the full exercise of the underwriters' option to purchase additional shares) at a price to the public of $33.00 per share. The Company received aggregate net proceeds from the June 2018 follow-on public offering of $65.9 million, after deducting underwriting discounts and commissions and offering expenses payable by the Company.
Basis of Accounting, Policy [Policy Text Block]	The financial data as of December 31, 2017 was derived from the Company's audited consolidated financial statements. The accompanying unaudited interim consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (GAAP) and, in management's opinion, have been prepared on the same basis as the audited financial statements and include all adjustments, consisting of normal recurring adjustments, necessary for the fair presentation of the Company's financial position, results of operations, comprehensive (loss) income, and cash flows for the interim periods. These unaudited interim consolidated financial statements should be read in conjunction with the Company’s audited financial statements included in the Company’s Annual Report on Form 10-K, filed with the U.S Securities and Exchange Commission (SEC) on February 13, 2018 (the 2017 10-K). The Company's accounting policies are described in Note 1 to the audited financial statements included in the 2017 10-K. Operating results for the three and six months ended June 30, 2018 are not necessarily indicative of the results that may be expected for the full fiscal year or any other interim period.
Use of Estimates [Policy Text Block]	Use of EstimatesThe preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from such estimates. See Note 1 to the audited financial statements included in the 2017 10-K for additional discussion of these estimates and assumptions.
Comprehensive Income, Policy [Policy Text Block]	Accumulated Other Comprehensive LossThere were no reclassifications out of accumulated other comprehensive loss during the three and six months ended June 30, 2018 and 2017.
Income Tax, Policy [Policy Text Block]	Income TaxesOn December 22, 2017, the U.S. government enacted the Tax Cuts and Jobs Act (Tax Act), making broad and complex changes to the Internal Revenue Code. The Company has made significant judgments and estimates in accordance with its interpretation of the Tax Act. As additional guidance on the Tax Act becomes available, the Company may adjust its interpretation of the requirements, which may result in a material change to income tax benefit or expense in the period in which the adjustment is made.
New Accounting Pronouncements, Policy [Policy Text Block]	Recent Accounting PronouncementsIn February 2016, the Financial Accounting Standards Board (FASB) issued an Accounting Standards Update (ASU) amending the lease presentation guidance. The ASU requires organizations that lease assets to recognize the rights and obligations created by those leases on the consolidated balance sheets. This ASU is effective for fiscal years beginning after December 15, 2018 including interim periods within that reporting period, with early adoption permitted. The Company has determined this guidance will require recognition of a lease liability and corresponding asset on the consolidated balance sheets equal to the present value of minimum lease payments. The carrying amount of the asset is derived from the amount of the lease liability at the end of each reporting period. The Company plans to adopt this guidance as of January 1, 2019, and is in the process of evaluating the impact on its consolidated financial statements.

Fair Value Notes Receivable (Policies)	6 Months Ended
Fair Value Notes Receivable (Policies)	Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]	As of June 30, 2018 and December 31, 2017, the Company's other long-term assets balance included a $2.5 million note receivable, recorded at its estimated collectible amount. The Company estimates that the carrying value of the note receivable approximates its fair value. The estimated fair value represents a Level 3 measurement within the fair value hierarchy, and is based on market interest rates and the assessed creditworthiness of the third party. The Company estimates the fair value of its long-term debt based upon rates currently available to the Company for debt with similar terms and remaining maturities. This is a Level 3 measurement. Based upon the terms of the debt, the carrying amount of long-term debt approximated fair value at June 30, 2018 and December 31, 2017.

- Definition

The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.

+ References + Details

Fair Value Fair Value (Policies)	6 Months Ended
Fair Value Fair Value (Policies)	Jun. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments, Policy [Policy Text Block]	The Company measures the fair value of restricted cash, foreign deposits, and money market funds based on quoted prices in active markets for identical assets. The fair value of the municipal bond is based on either recent trades in inactive markets or quoted market prices of similar instruments and other significant inputs derived from or corroborated by observable market data. Short-term investments are carried at amortized cost and the fair value is disclosed in Note 3, Investment Securities. The fair value of these investments is determined in the same manner as for available-for-sale securities and is considered a Level 1 measurement.

Claims Reserve Claims Reserve (Policies)	6 Months Ended
Claims Reserve Claims Reserve (Policies)	Jun. 30, 2018
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Liability Reserve Estimate, Policy [Policy Text Block]	Reserve for Veterinary InvoicesThe reserve for veterinary invoices is an estimate of the future amount the Company will pay for veterinary invoices that are dated as of, or prior to, its balance sheet date. The reserve also includes the Company's estimate of related internal processing costs. The reserve estimate involves actuarial projections, and is based on management's assessment of facts and circumstances currently known, and assumptions about anticipated patterns, including expected future trends in the number of veterinary invoices the Company will receive and the average cost of those veterinary invoices. The reserve is made for each of the Company's segments, subscription and other business, and are continually refined as the Company receives and pays veterinary invoices. Changes in management's assumptions and estimates may have a relatively large impact to the reserve and associated expense.

Segments Segments (Policies)	6 Months Ended
Segments Segments (Policies)	Jun. 30, 2018
Segment Reporting [Abstract]
Segment Reporting, Policy [Policy Text Block]	The Company has two segments: subscription business and other business. The subscription business segment includes monthly subscription fees related to the Company’s medical insurance which is marketed directly to consumers, while the other business segment includes all other business that is not directly marketed to consumers. The chief operating decision maker uses two measures to evaluate segment performance: revenue and gross profit. Additionally, other operating expenses, such as sales and marketing expenses, are allocated to each segment and evaluated when material. Interest and other expenses and income taxes are not allocated to the segments, nor included in the measure of segment profit or loss. The Company does not analyze discrete segment balance sheet information related to long-term assets.

Net Loss per Share (Tables)

6 Months Ended

Jun. 30, 2018

Earnings Per Share, Basic and Diluted [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

The components of basic and diluted earnings per share were as follows:



	Three Months Ended June 30,					Six Months Ended June 30,
	2018			2017		2018			2017
Basic earnings per share:
Net (loss) income	$	(377	)	$	411	$	(1,857	)	$	(1,071	)
Shares used in computation:
Weighted average common shares outstanding	30,721,037			29,510,907		30,485,121			29,383,502
Basic earnings per share	$	(0.01	)	$	0.01	$	(0.06	)	$	(0.04	)

Diluted earnings per share:
Net (loss) income	$	(377	)	$	411	$	(1,857	)	$	(1,071	)
Shares used in computation:
Weighted average common shares outstanding	30,721,037			29,510,907		30,485,121			29,383,502
Stock options	—			2,511,012		—			—
Restricted stock awards and units	—			351,668		—			—
Warrants	—			361,037		—			—
Weighted average number of shares	30,721,037			32,734,624		30,485,121			29,383,502
Diluted earnings per share	$	(0.01	)	$	0.01	$	(0.06	)	$	(0.04	)

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

The following potentially dilutive equity securities were not included in the diluted earnings per common share calculation because they would have had an antidilutive effect:



	Three Months Ended June 30,		Six Months Ended June 30,
	2018	2017	2018	2017
Stock options	3,696,242	1,035,163	3,696,242	4,207,577
Restricted stock awards and restricted stock units	555,984	—	555,984	351,668
Warrants	480,000	—	480,000	810,000

Investment Securities Available-for-Sale (Tables)

6 Months Ended

Jun. 30, 2018

Investments [Abstract]

Investment [Table Text Block]

The amortized cost, gross unrealized holding gains and losses, fair value of long-term investments, which are classified as available-for-sale, and fair value of short-term investments by major security type and class of security were as follows as of June 30, 2018 and December 31, 2017 (in thousands):



	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses			Fair Value
As of June 30, 2018
Available-for-sale:
Foreign deposits	$	2,311	$	—	$	—		$	2,311
Municipal bond	1,000		—		—			1,000
	$	3,311	$	—	$	—		$	3,311
Short-term investments:
U.S. Treasury securities	$	6,231	$	—	$	(2	)	$	6,229
Certificates of deposit	439		—		—			439
U.S. government funds	36,132		—		—			36,132
	$	42,802	$	—	$	(2	)	$	42,800

	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses			Fair Value
As of December 31, 2017
Available-for-sale:
Foreign deposits	$	2,237	$	—	$	—		$	2,237
Municipal bond	1,000		—		—			1,000
	$	3,237	$	—	$	—		$	3,237
Short-term investments:
U.S. Treasury securities	$	5,783	$	—	$	(4	)	$	5,779
Certificates of deposit	690		1		—			691
U.S. government funds	31,117		—		—			31,117
	$	37,590	$	1	$	(4	)	$	37,587

Available-for-sale Securities [Table Text Block]

Maturities of debt securities classified as available-for-sale were as follows (in thousands):



	June 30, 2018
	Amortized Cost		Fair Value
Available-for-sale:
Due after one year through five years	$	2,311	$	2,311
Due after five years through ten years	1,000		1,000
	$	3,311	$	3,311

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References + Details

Fair Value (Tables)

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Fair value, asset & liabilities measured on recurring basis [Table Text Block]

The following table summarizes, by major security type, the Company's assets that are measured at fair value on a recurring basis, and placement within the fair value hierarchy (in thousands):



	As of June 30, 2018
	Fair Value		Level 1		Level 2
Assets
Restricted cash	$	1,400	$	1,400	$	—
Foreign deposits	2,311		2,311		—
Municipal bond	1,000		—		1,000
Money market funds	45,420		45,420		—
Total	$	50,131	$	49,131	$	1,000

	As of December 31, 2017
	Fair Value		Level 1		Level 2
Assets
Restricted cash	$	600	$	600	$	—
Foreign deposits	2,237		2,237		—
Municipal bond	1,000		—		1,000
Money market funds	5,167		5,167		—
Total	$	9,004	$	8,004	$	1,000

The Company measures the fair value of restricted cash, foreign deposits, and money market funds based on quoted prices in active markets for identical assets. The fair value of the municipal bond is based on either recent trades in inactive markets or quoted market prices of similar instruments and other significant inputs derived from or corroborated by observable market data. Short-term investments are carried at amortized cost and the fair value is disclosed in Note 3, Investment Securities. The fair value of these investments is determined in the same manner as for available-for-sale securities and is considered a Level 1 measurement.

Claims Reserve (Tables)

6 Months Ended

Jun. 30, 2018

Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]

Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block]

Summarized below are the changes in the total liability for the Company's subscription business segment (in thousands):



	Six Months Ended June 30,
Subscription	2018		2017
Reserve at beginning of year	$	11,059	$	8,538
Veterinary invoices during the period related to:
Current year	91,464		74,244
Prior years	119		(257		)
Total veterinary invoice expense	91,583		73,987
Amounts paid during the period related to:
Current year	80,841		65,549
Prior years	9,256		7,138
Total paid	90,097		72,687
Non-cash expenses	333		229
Reserve at end of period	$	12,212	$	9,609

The Company's reserve for the subscription business segment increased from $11.1 million at December 31, 2017 to $12.2 million at June 30, 2018. This change was comprised of $91.6 million in expense recorded during the period less $90.1 million in payments of veterinary invoices. The $91.6 million in veterinary invoice expense incurred includes an adjustment of $0.1 million to the reserves relating to prior years, which is the result of ongoing analysis of recent payment trends. For the six months ended June 30, 2017, the Company decreased prior year reserves by $0.3 million as a result of analysis of payment trends.

Summarized below are the changes in total liability for the Company's other business segment (in thousands):



	Six Months Ended June 30,
Other Business	2018			2017
Reserve at beginning of year	$	1,697		$	983
Veterinary invoices during the period related to:
Current year	10,589			6,337
Prior years	(279		)	(128		)
Total veterinary invoice expense	10,310			6,209
Amounts paid during the period related to:
Current year	8,916			5,217
Prior years	1,307			764
Total paid	10,223			5,981
Non-cash expenses	—			—
Reserve at end of period	$	1,784		$	1,211

The Company’s reserve for the other business segment increased from $1.7 million at December 31, 2017 to $1.8 million at June 30, 2018. This change was comprised of $10.3 million in expense recorded during the period less $10.2 million in payments of veterinary invoices. The $10.3 million in veterinary invoice expense incurred includes a reduction of $0.3 million to the reserves relating to prior years, which is the result of ongoing analysis of recent payment trends. For the six months ended June 30, 2017, the Company decreased prior year reserves by $0.1 million as a result of analysis of payment trends

IBRN plus expected development on reported claims[Table Text Block]

In the following tables, the reserve for veterinary invoices for each segment is presented as the amount (in thousands) by year the veterinary invoice relates to, referred to as the year of occurrence.



Subscription	As of June 30, 2018
Year of Occurrence
2016	$	386
2017	1,537
2018	10,289
	$	12,212



Other Business	As of June 30, 2018
Year of Occurrence
2017	$	110
2018	1,674
	$	1,784

Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 2018

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

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

Stock-based compensation expense includes stock options, restricted stock awards, and restricted stock units granted to employees and non-employees and has been reported in the Company’s consolidated statements of operations depending on the function performed by the employee or non-employee. Stock-based compensation expense recognized in the consolidated statements of operations was as follows (in thousands):



	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Veterinary invoice expense	$	148	$	89	$	268	$	159
Other cost of revenue	104		60		181		103
Technology and development	60		59		109		109
General and administrative	625		482		1,074		913
Sales and marketing	349		198		622		385
Total stock-based compensation	$	1,286	$	888	$	2,254	$	1,669

As of June 30, 2018, for all employees, the Company had 683,338 unvested stock options and 555,984 unvested restricted stock awards and restricted stock units that are expected to vest. Stock-based compensation expense of $4.3 million related to unvested stock options and $8.4 million related to unvested restricted stock awards and restricted stock units, each expected to be recognized over a weighted average period of approximately 2.3 years

Share-based Compensation, Stock Options, Activity [Table Text Block]

A summary of the Company's stock option activity is as follows:



	Number Of Options		Weighted Average Exercise Price per Share		Aggregate Intrinsic Value (in thousands)
Outstanding as of December 31, 2017	4,006,399		$	7.16	$	88,578
Granted	—		—
Exercised	(262,967	)	6.30		6,681
Forfeited	(47,190	)	15.44
Outstanding as of June 30, 2018	3,696,242		$	7.12	$	116,370

Exercisable as of June 30, 2018	3,008,570		$	5.22	$	100,432

As of June 30, 2018, stock options outstanding and stock options exercisable had a weighted average remaining contractual life of 4.8 years and 4.1 years, respectively.

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

A summary of the Company’s restricted stock award and restricted stock unit activity is as follows:



	Number of Shares		Weighted Average Grant Date Fair Value per Share
Unvested shares as of December 31, 2017	256,842		$	4.77
Granted	323,358		27.87
Vested	(12,603	)	26.85
Forfeited	(11,613	)	28.36
Unvested shares as of June 30, 2018	555,984		$	18.27

Stock-based Compensation Stockholder's Equity (Tables)	6 Months Ended
Stock-based Compensation Stockholder's Equity (Tables)	Jun. 30, 2018
Class of Warrant or Right [Line Items]
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]	During the six months ended June 30, 2018, 330,000 of the Company's outstanding warrants were exercised. As of June 30, 2018, warrants to purchase 480,000 shares of the Company's common stock at $10.00 per share remained outstanding. The warrants automatically convert to common stock in 2019.

- Definition

Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable.

+ References + Details

Stock-based Compensation Follow-on Public Offering (Tables)	6 Months Ended
	Jun. 30, 2018
Equity [Abstract]
Follow-on Public Offering, June 2018 [Table Text Block]	In the June 2018 follow-on public offering, the Company sold 2,090,909 shares of common stock (inclusive of 272,727 shares of common stock sold by the Company pursuant to the full exercise of the underwriters' option to purchase additional shares) at a price to the public of $33.00 per share. The Company received aggregate net proceeds of $65.9 million, after deducting underwriting discounts and commissions and offering expenses payable by the Company.On July 18, 2018, the Company purchased an equity interest, as a limited partner, in a privately held corporation for approximately $3.0 million. The Company has a contingent commitment to purchase an additional $4.0 million of equity for eighteen months following the initial investment. In conjunction with the investment, the Company has extended a revolving line of credit with a maximum borrowing capacity of $2.5 million.

Segments (Tables)

6 Months Ended

Jun. 30, 2018

Segment Reporting [Abstract]

Revenue and Gross Profit from Segments [Table Text Block]

Revenue and gross profit of the Company’s segments were as follows (in thousands):



	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
Revenue:
Subscription business	$	63,867		$	52,641		$	125,384		$	102,870
Other business	9,525			5,634			17,768			10,134
	73,392			58,275			143,152			113,004
Veterinary invoice expense:
Subscription business	46,446			37,664			91,583			73,987
Other business	5,334			3,345			10,310			6,209
	51,780			41,009			101,893			80,196
Other cost of revenue:
Subscription business	5,887			4,927			11,764			9,850
Other business	3,372			1,988			6,078			3,452
	9,259			6,915			17,842			13,302
Gross profit:
Subscription business	11,534			10,050			22,037			19,033
Other business	819			301			1,380			473
	12,353			10,351			23,417			19,506

Technology and development	2,298			2,322			4,462			4,725
General and administrative	4,610			4,245			9,068			8,257
Sales and marketing:
Subscription business	5,614			4,309			11,465			8,350
Other business	88			63			175			111
	5,702			4,372			11,640			8,461
Operating loss	$	(257	)	$	(588	)	$	(1,753	)	$	(1,937	)

Revenue from External Customers by Geographic Areas [Table Text Block]

The following table presents the Company’s revenue by geographic region of the member (in thousands):



	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
United States	$	59,431	$	47,306	$	115,440	$	91,440
Canada	13,961		10,969		27,712		21,564
Total revenue	$	73,392	$	58,275	$	143,152	$	113,004

Subsequent Events (Tables)	6 Months Ended
Subsequent Events (Tables)	Jun. 30, 2018
Subsequent Events [Abstract]
Follow-on Public Offering, June 2018 [Table Text Block]	In the June 2018 follow-on public offering, the Company sold 2,090,909 shares of common stock (inclusive of 272,727 shares of common stock sold by the Company pursuant to the full exercise of the underwriters' option to purchase additional shares) at a price to the public of $33.00 per share. The Company received aggregate net proceeds of $65.9 million, after deducting underwriting discounts and commissions and offering expenses payable by the Company.On July 18, 2018, the Company purchased an equity interest, as a limited partner, in a privately held corporation for approximately $3.0 million. The Company has a contingent commitment to purchase an additional $4.0 million of equity for eighteen months following the initial investment. In conjunction with the investment, the Company has extended a revolving line of credit with a maximum borrowing capacity of $2.5 million.
Building Purchase [Table Text Block]	n July 18, 2018, the Company purchased an equity interest, as a limited partner, in a privately held corporation for approximately $3.0 million. The Company has a contingent commitment to purchase an additional $4.0 million of equity for eighteen months following the initial investment. In conjunction with the investment, the Company has extended a revolving line of credit with a maximum borrowing capacity of $2.5 million.

Nature of Operations and Summary of Significant Accounting Policies (Details) Narrative - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Organization and Basis of Presentation [Line Items]
Common Stock, Shares, Issued	2,090,909
Common Stock, Shares, Issued to Underwriter	272,727
Shares Issued, Price Per Share	$ 33.00
Proceeds from Issuance or Sale of Equity	$ 65,886	$ 0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	$ 0	$ 0

Net Loss per Share (Details) Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Employee Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	3,696,242	1,035,163	3,696,242	4,207,577
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	555,984	0	555,984	351,668
Warrant [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	480,000	0	480,000	810,000

Net Loss per Share Computation of Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Schedule of Earnings Per Share, Basic and Diluted [Line Items]
Net Income (Loss) Available to Common Stockholders, Basic	$ (377)	$ 411	$ (1,857)	$ (1,071)
Weighted Average Number of Shares Outstanding, Basic	30,721,037	29,510,907	30,485,121	29,383,502
Earnings Per Share, Basic	$ (0.01)	$ 0.01	$ (0.06)	$ (0.04)
Weighted Average Number of Shares Outstanding, Diluted	30,721,037	32,734,624	30,485,121	29,383,502
Earnings Per Share, Diluted	$ (0.01)	$ 0.01	$ (0.06)	$ (0.04)
Employee Stock Option [Member]
Schedule of Earnings Per Share, Basic and Diluted [Line Items]
Weighted Average Number Diluted Shares Outstanding Adjustment	0	2,511,012	0	0
Restricted Stock Units (RSUs) [Member]
Schedule of Earnings Per Share, Basic and Diluted [Line Items]
Weighted Average Number Diluted Shares Outstanding Adjustment	0	351,668	0	0
Warrant [Member]
Schedule of Earnings Per Share, Basic and Diluted [Line Items]
Weighted Average Number Diluted Shares Outstanding Adjustment	0	361,037	0	0

Investment Securities (Details) Investment Schedule - USD ($) $ in Thousands	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Investment [Line Items]
Available-for-sale securities, amortized cost	$ 3,311
Available-for-sale Securities, Gross Unrealized Gain	0		$ 0
Available-for-sale Securities, Gross Unrealized Loss	0		0
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis		$ 3,311	3,237
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	3,311	$ 3,311	3,237
Short-term investments, amortized cost	42,802		37,590
Short-term Investments, Gross Unrealized Holding Gains	0		1
Short-term investments, gross unrealized holding losses	(2)		(4)
Short-term Investments, fair value	42,800		37,587
Deposits [Member]
Investment [Line Items]
Available-for-sale securities, amortized cost	2,311		2,237
Available-for-sale Securities, Gross Unrealized Gain	0		0
Available-for-sale Securities, Gross Unrealized Loss	0		0
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	2,311		2,237
Municipal Bonds [Member]
Investment [Line Items]
Available-for-sale securities, amortized cost	1,000		1,000
Available-for-sale Securities, Gross Unrealized Gain	0		0
Available-for-sale Securities, Gross Unrealized Loss	0		0
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	1,000		1,000
U.S. Treasury securities
Investment [Line Items]
Short-term investments, amortized cost	6,231		5,783
Short-term Investments, Gross Unrealized Holding Gains	0		0
Short-term investments, gross unrealized holding losses	(2)		(4)
Short-term Investments, fair value	6,229		5,779
Certificates of deposit
Investment [Line Items]
Short-term investments, amortized cost	439		690
Short-term Investments, Gross Unrealized Holding Gains	0		1
Short-term investments, gross unrealized holding losses	0		0
Short-term Investments, fair value	439		691
US government debt securities
Investment [Line Items]
Short-term investments, amortized cost	36,132		31,117
Short-term Investments, Gross Unrealized Holding Gains	0		0
Short-term investments, gross unrealized holding losses	0		0
Short-term Investments, fair value	$ 36,132		$ 31,117

Investment Securities (Details) Available-for-Sale - USD ($) $ in Thousands	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Available-for-sale Securities [Abstract]
Available-for-sale securities, debt maturities, year two through five, amortized cost basis		$ 2,311
Available-for-sale securities, debt maturities, year two through five, fair value		2,311
Available-for-sale securities, debt maturities, year six through ten, amortized cost basis		1,000
Available-for-sale securities, debt maturities, year six through ten, fair value		1,000
Available-for-sale securities, amortized cost		3,311	$ 3,237
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	$ 3,311	$ 3,311	$ 3,237

Fair Value (Details) Unobservable - USD ($)	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted Cash	$ 1,400,000		$ 600,000
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	3,311,000	$ 3,311,000	3,237,000
Assets, Fair Value Disclosure	50,131,000		9,004,000
Notes Receivable, Fair Value Disclosure	2,500,000		2,500,000
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	49,131,000		8,004,000
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	1,000,000		1,000,000
Cash and Cash Equivalents [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted Cash	1,400,000		600,000
Cash and Cash Equivalents [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted Cash	1,400,000		600,000
Cash and Cash Equivalents [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted Cash	0		0
Deposits [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	2,311,000		2,237,000
Deposits [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	2,311,000		2,237,000
Deposits [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	0		0
Municipal bond
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	1,000,000		1,000,000
Available-for-sale Securities, Debt Maturities, Single Maturity Date	1,000,000		1,000,000
Municipal bond \| Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Maturities, Single Maturity Date	0		0
Municipal bond \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities, Debt Maturities, Single Maturity Date	1,000,000		1,000,000
Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	45,420,000		5,167,000
Money Market Funds [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	45,420,000		5,167,000
Money Market Funds [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	$ 0		$ 0

Debt (Details) Narrative - USD ($) $ in Millions	6 Months Ended
Debt (Details) Narrative - USD ($) $ in Millions	Jun. 30, 2018	Mar. 31, 2018
Debt Disclosure [Abstract]
Payments to Acquire Buildings	$ 55.0
Line of Credit Facility, Maximum Borrowing Capacity	$ 50.0	$ 30.0
Line of credit facility, interest rate description	greater of 4.5%, or 1.25% plus the prime rate
Line of Credit Facility, Interest Rate During Period	6.25%
Line of Credit Facility, Ancillary Services and Letter of Credit	$ 4.5
Restricted Cash and Cash Equivalents	1.4
Line of Credit Facility, Remaining Borrowing Capacity	20.2
Line of Credit Facility, Ancillary Services and Letter of Credit	1.9
Long-term Line of Credit	18.8
Line of Credit Financing Fee	$ 0.2

Commitment and Contingencies Agreement for the Purchase of Corporate Headquarter (Details) $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($) shares
Commitments and Contingencies Disclosure [Abstract]
Payments to Acquire Buildings	$ 55.0
Payments to Acquire Buildings, Shares \| shares	303,030
Operating Leases, Rent Expense	$ 1.0
Earnest Money Deposits	$ 3.3

Claims Reserve (Details) Claims Loss Roll-forward - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2017	Dec. 31, 2016
Subscription business
Supplementary Insurance Information, by Segment [Line Items]
Claims Reserve	$ 12,212	$ 9,609		$ 11,059	$ 8,538
Current Year Claims Incurred	91,464	74,244
Prior Year Claims Incurred	119	(257)	$ (300)
Total Claims Incurred	91,583	73,987
Current Year Claims Paid	80,841	65,549
Prior Years Claims Paid	9,256	7,138
Total Claims Paid	90,097	72,687
Claims expense non-cash	333	229
Claims Reserve by Loss Year
Incurred but Not Reported (IBNR) Claims Liability	12,212
Other business
Supplementary Insurance Information, by Segment [Line Items]
Claims Reserve	1,784	1,211		$ 1,697	$ 983
Current Year Claims Incurred	10,589	6,337
Prior Year Claims Incurred	(279)	(128)
Total Claims Incurred	10,310	6,209
Current Year Claims Paid	8,916	5,217
Prior Years Claims Paid	1,307	764
Total Claims Paid	10,223	5,981
Claims expense non-cash	0	$ 0
Claims Reserve by Loss Year
Incurred but Not Reported (IBNR) Claims Liability	1,784
Short-duration Insurance Contracts, Accident Year 2016 [Member] \| Subscription business
Claims Reserve by Loss Year
Incurred but Not Reported (IBNR) Claims Liability	386
Short-duration Insurance Contracts, Accident Year 2017 [Member] \| Subscription business
Claims Reserve by Loss Year
Incurred but Not Reported (IBNR) Claims Liability	1,537
Short-duration Insurance Contracts, Accident Year 2017 [Member] \| Other business
Claims Reserve by Loss Year
Incurred but Not Reported (IBNR) Claims Liability	110
Shortduration insurance contracts for accident year 2018 [Member] \| Subscription business
Claims Reserve by Loss Year
Incurred but Not Reported (IBNR) Claims Liability	10,289
Shortduration insurance contracts for accident year 2018 [Member] \| Other business
Claims Reserve by Loss Year
Incurred but Not Reported (IBNR) Claims Liability	$ 1,674

Claims Reserve (Details) Narrative - USD ($) $ in Thousands	6 Months Ended
Claims Reserve (Details) Narrative - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2017	Dec. 31, 2016
Subscription business
Supplementary Insurance Information, by Segment [Line Items]
Claims Reserve	$ 12,212	$ 9,609		$ 11,059	$ 8,538
Total Claims Incurred	91,583	73,987
Total Claims Paid	90,097	72,687
Prior Year Claims Incurred	119	(257)	$ (300)
Other business
Supplementary Insurance Information, by Segment [Line Items]
Claims Reserve	1,784	1,211		$ 1,697	$ 983
Total Claims Incurred	10,310	6,209
Total Claims Paid	10,223	5,981
Prior Year Claims Incurred	$ (279)	$ (128)

Claims Reserve Claims Reserve (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2017	Dec. 31, 2016
Subscription business
Liability for Claims and Claims Adjustment Expense [Line Items]
Claims Reserve	$ 12,212	$ 9,609		$ 11,059	$ 8,538
Current Year Claims Incurred	91,464	74,244
Prior Year Claims Incurred	119	(257)	$ (300)
Current Year Claims Paid	80,841	65,549
Prior Years Claims Paid	9,256	7,138
Total Claims Paid	90,097	72,687
Claims expense non-cash	333	229
Total Claims Incurred	91,583	73,987
Other business
Liability for Claims and Claims Adjustment Expense [Line Items]
Claims Reserve	1,784	1,211		$ 1,697	$ 983
Current Year Claims Incurred	10,589	6,337
Prior Year Claims Incurred	(279)	(128)
Current Year Claims Paid	8,916	5,217
Prior Years Claims Paid	1,307	764
Total Claims Paid	10,223	5,981
Claims expense non-cash	0	0
Total Claims Incurred	$ 10,310	$ 6,209

Stock-based Compensation (Details) Expense Category - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Stock-based Compensation
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost	$ 1,286	$ 888	$ 2,254	$ 1,669
Claims expense
Stock-based Compensation
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost	148	89	268	159
Other Cost of Revenue
Stock-based Compensation
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost	104	60	181	103
Technology and development
Stock-based Compensation
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost	60	59	109	109
General and administrative
Stock-based Compensation
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost	625	482	1,074	913
Sales and marketing
Stock-based Compensation
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost	349	$ 198	$ 622	$ 385
Restricted Stock Units (RSUs) [Member]
Stock-based Compensation
Employee share-based compensation arrangement and non-employee, weighted average remaining vesting period			2 years 3 months
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 8,400		$ 8,400
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	555,984		555,984
Employee Stock Option [Member]
Stock-based Compensation
Employee share-based compensation arrangement and non-employee, weighted average remaining vesting period			2 years 3 months 18 days
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 4,300		$ 4,300
Employee share-based compensation arrangement by share-based payment award, options, nonvested, number of shares	683,338		683,338

Stock-based Compensation (Details) Options Granted, Exercised and Forfeited - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-based compensation, options, outstanding, number of shares	3,696,242	4,006,399
Stock-based compensation, options, granted, number of options	0
Stock-based compensation, options, exercised	(262,967)
Stock-based compensation, options, forfeited	(47,190)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number	3,008,570
Stock-based compensation, options, outstanding, weighted-average exercise price	$ 7.12	$ 7.16
Stock-based compensation, options, granted, weighted-average exercise price	0
Stock-based compensation, options, exercised, weighted-average exercise price	6.30
Stock-based compensation, options, forfeited, weighted-average exercise price	15.44
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price	$ 5.22
Stock-based compensation, options, outstanding, aggregate intrinsic value	$ 116,370	$ 88,578
Stock-based compensation, options, exercised, aggregate intrinsic value	6,681
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value	$ 100,432
Remaining contractual life, share-based payments, weighted average	4 years 9 months 18 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term	4 years 1 month 6 days

Stock-based Compensation Restricted Stock Awards (Details) - Restricted Stock [Member] - $ / shares	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	555,984	256,842
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	323,358
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	(11,613)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	(12,603)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Weighted Average Grant Date Fair Value [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 18.27	$ 4.77
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	27.87
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value	28.36
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	$ 26.85

Stock-based Compensation Stockholder Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Stockholders' Equity Attributable to Parent [Abstract]
Stock Issued During Period, Shares, New Issues	2,090,909
Redemption of warrants	330,000
Class of Warrant or Right, Outstanding	480,000
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 10.00
Common Stock, Shares, Issued to Underwriter	272,727
Shares Issued, Price Per Share	$ 33.00
Proceeds from Issuance or Sale of Equity	$ 65,886	$ 0

Segments (Details) Business Segment - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Revenue	$ 73,392	$ 58,275	$ 143,152	$ 113,004
Veterinary invoice expense	51,780	41,009	101,893	80,196
Other cost of revenue	9,259	6,915	17,842	13,302
Gross profit	12,353	10,351	23,417	19,506
Sales and marketing	5,702	4,372	11,640	8,461
Technology and Development	2,298	2,322	4,462	4,725
General and administrative	4,610	4,245	9,068	8,257
Operating loss	(257)	(588)	(1,753)	(1,937)
Subscription business
Segment Reporting Information [Line Items]
Revenue	63,867	52,641	125,384	102,870
Veterinary invoice expense	46,446	37,664	91,583	73,987
Other cost of revenue	5,887	4,927	11,764	9,850
Gross profit	11,534	10,050	22,037	19,033
Sales and marketing	5,614	4,309	11,465	8,350
Other business
Segment Reporting Information [Line Items]
Revenue	9,525	5,634	17,768	10,134
Veterinary invoice expense	5,334	3,345	10,310	6,209
Other cost of revenue	3,372	1,988	6,078	3,452
Gross profit	819	301	1,380	473
Sales and marketing	$ 88	$ 63	$ 175	$ 111

Segments (Details) Revenue by Geography - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Revenues	$ 73,392	$ 58,275	$ 143,152	$ 113,004
CANADA
Segment Reporting Information [Line Items]
Revenues	13,961	10,969	27,712	21,564
UNITED STATES
Segment Reporting Information [Line Items]
Revenues	$ 59,431	$ 47,306	$ 115,440	$ 91,440

Subsequent Events (Details) - USD ($) $ in Millions	6 Months Ended
Subsequent Events (Details) - USD ($) $ in Millions	Jun. 30, 2018	Jul. 18, 2018
Subsequent Event [Line Items]
Investment Company, Committed Capital	$ 4.0
Increase (Decrease) in Notes Receivables	2.5
Payments to Acquire Buildings	$ 55.0
Payments to Acquire Buildings, Shares	303,030
Subsequent Event [Member]
Subsequent Event [Line Items]
Purchase of Equity Interest		$ 3.0