Avalara (AVLR) 10-Q 10 Aug 18 2018 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Jul. 31, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q2
Trading Symbol	AVLR
Entity Registrant Name	AVALARA INC,
Entity Central Index Key	1,348,036
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		66,472,251

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 173,108	$ 14,075
Trade accounts receivable—net of allowance for doubtful accounts of $531 and $905, respectively	28,681	26,596
Prepaid expenses and other current assets	6,375	7,016
Total current assets before customer fund assets	208,164	47,687
Funds held from customers	17,910	13,082
Receivable from customers—net of allowance of $591 and $666, respectively	157	313
Total current assets	226,231	61,082
Property and equipment—Net	32,437	25,394
Other assets:
Goodwill	70,692	72,482
Intangible assets—net	22,559	19,074
Other noncurrent assets	796	780
Total other assets	94,047	92,336
Total assets	352,715	178,812
Current liabilities:
Accrued expenses and trade payables	36,351	38,164
Deferred revenue	100,664	83,778
Credit facility and notes payable	4,375	859
Total current liabilities before customer funds obligations	141,390	122,801
Customer funds obligations	18,502	14,061
Total current liabilities	159,892	136,862
Noncurrent liabilities:
Deferred revenue	8,680	8,453
Deferred tax liability	887	1,854
Credit facility	25,218	38,840
Deferred rent	15,848	14,689
Other noncurrent liabilities	36	785
Total liabilities	210,561	201,483
Shareholders' equity (deficit):
Preferred stock, $0.0001 par value– no shares issued and outstanding at June 30, 2018 and December 31, 2017, and 20,000 shares authorized as of June 30, 2018
Common stock, $0.0001 par value– 66,458 and 5,992 shares issued and outstanding at June 30, 2018 and December 31, 2017, respectively, 600,000 and 153,945 shares authorized as of June 30, 2018 and December 31, 2017, respectively	7	1
Additional paid-in capital	589,321	18,121
Accumulated other comprehensive income (loss)	(2,107)	338
Accumulated deficit	(445,067)	(412,052)
Total shareholders’ equity (deficit)	142,154	(393,592)
Total liabilities and shareholders' equity (deficit)	$ 352,715	178,812
Series A Convertible Preferred Stock
Convertible preferred stock:
Convertible preferred stock		12,715
Series A-1 Convertible Preferred Stock
Convertible preferred stock:
Convertible preferred stock		2,081
Series A-2 Convertible Preferred Stock
Convertible preferred stock:
Convertible preferred stock		303
Series B Convertible Preferred Stock
Convertible preferred stock:
Convertible preferred stock		3,756
Series B-1 Convertible Preferred Stock
Convertible preferred stock:
Convertible preferred stock		23,259
Series C Convertible Preferred Stock
Convertible preferred stock:
Convertible preferred stock		19,782
Series C-1 Convertible Preferred Stock
Convertible preferred stock:
Convertible preferred stock		27,961
Series D Convertible Preferred Stock
Convertible preferred stock:
Convertible preferred stock		41,130
Series D-1 Convertible Preferred Stock
Convertible preferred stock:
Convertible preferred stock		143,915
Series D-2 Convertible Preferred Stock
Convertible preferred stock:
Convertible preferred stock		$ 96,019

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Trade accounts receivable, allowance for doubtful accounts	$ 531	$ 905
Receivable from customers, allowance	$ 591	$ 666
Convertible preferred stock, shares issued	0
Convertible preferred stock, shares outstanding	0
Preferred stock, par value	$ 0.0001	$ 0.0001
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Preferred stock, shares authorized	20,000,000
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares, issued	66,458,000	5,992,000
Common stock, shares, outstanding	66,458,000	5,992,000
Common stock, shares authorized	600,000,000	153,945,000
Series A Convertible Preferred Stock
Convertible preferred stock, par value	$ 0.0001	$ 0.0001
Convertible preferred stock, shares issued	0	12,309,000
Convertible preferred stock, shares outstanding	0	12,309,000
Convertible preferred stock, shares authorized		13,814,000
Convertible preferred stock, aggregate liquidation preference		$ 10,930
Series A-1 Convertible Preferred Stock
Convertible preferred stock, par value	$ 0.0001	$ 0.0001
Convertible preferred stock, shares issued	0	4,688,000
Convertible preferred stock, shares outstanding	0	4,688,000
Convertible preferred stock, shares authorized		5,012,000
Convertible preferred stock, aggregate liquidation preference		$ 2,081
Series A-2 Convertible Preferred Stock
Convertible preferred stock, par value	$ 0.0001	$ 0.0001
Convertible preferred stock, shares issued	0	279,000
Convertible preferred stock, shares outstanding	0	279,000
Convertible preferred stock, shares authorized		279,000
Convertible preferred stock, aggregate liquidation preference		$ 472
Series B Convertible Preferred Stock
Convertible preferred stock, par value	$ 0.0001	$ 0.0001
Convertible preferred stock, shares issued	0	1,793,000
Convertible preferred stock, shares outstanding	0	1,793,000
Convertible preferred stock, shares authorized		2,133,000
Convertible preferred stock, aggregate liquidation preference		$ 1,685
Series B-1 Convertible Preferred Stock
Convertible preferred stock, par value	$ 0.0001	$ 0.0001
Convertible preferred stock, shares issued	0	21,518,000
Convertible preferred stock, shares outstanding	0	21,518,000
Convertible preferred stock, shares authorized		21,600,000
Convertible preferred stock, aggregate liquidation preference		$ 23,670
Series C Convertible Preferred Stock
Convertible preferred stock, par value	$ 0.0001	$ 0.0001
Convertible preferred stock, shares issued	0	7,069,000
Convertible preferred stock, shares outstanding	0	7,069,000
Convertible preferred stock, shares authorized		7,069,000
Convertible preferred stock, aggregate liquidation preference		$ 20,000
Series C-1 Convertible Preferred Stock
Convertible preferred stock, par value	$ 0.0001	$ 0.0001
Convertible preferred stock, shares issued	0	8,511,000
Convertible preferred stock, shares outstanding	0	8,511,000
Convertible preferred stock, shares authorized		8,590,000
Convertible preferred stock, aggregate liquidation preference		$ 12,767
Series D Convertible Preferred Stock
Convertible preferred stock, par value	$ 0.0001	$ 0.0001
Convertible preferred stock, shares issued	0	8,566,000
Convertible preferred stock, shares outstanding	0	8,566,000
Convertible preferred stock, shares authorized		10,172,000
Convertible preferred stock, aggregate liquidation preference		$ 44,972
Series D-1 Convertible Preferred Stock
Convertible preferred stock, par value	$ 0.0001	$ 0.0001
Convertible preferred stock, shares issued	0	22,808,000
Convertible preferred stock, shares outstanding	0	22,808,000
Convertible preferred stock, shares authorized		22,862,000
Convertible preferred stock, aggregate liquidation preference		$ 144,147
Series D-2 Convertible Preferred Stock
Convertible preferred stock, par value	$ 0.0001	$ 0.0001
Convertible preferred stock, shares issued	0	14,245,000
Convertible preferred stock, shares outstanding	0	14,245,000
Convertible preferred stock, shares authorized		14,815,000
Convertible preferred stock, aggregate liquidation preference		$ 96,154

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue:
Subscription and returns	$ 59,675	$ 48,309	$ 117,545	$ 94,157
Professional services and other	4,034	2,582	7,541	5,699
Total revenue	63,709	50,891	125,086	99,856
Cost of revenue:
Subscription and returns	15,837	12,109	30,654	23,353
Professional services and other	2,795	2,258	5,487	4,577
Total cost of revenue	18,632	14,367	36,141	27,930
Gross profit	45,077	36,524	88,945	71,926
Operating expenses:
Research and development	12,428	10,291	25,047	19,973
Sales and marketing	40,604	33,191	77,911	63,491
General and administrative	9,341	7,484	18,552	18,097
Total operating expenses	62,373	50,966	121,510	101,561
Operating loss	(17,296)	(14,442)	(32,565)	(29,635)
Other (income) expense:
Interest income	(269)	(15)	(305)	(25)
Interest expense	1,067	654	1,961	1,182
Other (income) expense, net	(442)	509	(472)	945
Total other (income) expense, net	356	1,148	1,184	2,102
Loss before income taxes:	(17,652)	(15,590)	(33,749)	(31,737)
Provision for (benefit from) income taxes	114	(141)	(734)	(290)
Net loss	$ (17,766)	$ (15,449)	$ (33,015)	$ (31,447)
Net loss per share attributable to common shareholders, basic and diluted	$ (1.24)	$ (2.81)	$ (3.21)	$ (5.78)
Weighted average shares of common stock outstanding, basic and diluted	14,383	5,494	10,299	5,442

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (17,766)	$ (15,449)	$ (33,015)	$ (31,447)
Other comprehensive income (loss)—Foreign currency translation	(3,048)	(211)	(2,445)	799
Total comprehensive loss	$ (20,814)	$ (15,660)	$ (35,460)	$ (30,648)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net loss	$ (33,015)	$ (31,447)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	5,992	5,266
Stock-based compensation	7,074	5,814
Deferred tax expense	(967)	(403)
Amortization of deferred rent	263	(445)
Non-cash change in earnout liability	(462)	835
Non-cash bad debt (recovery) expense	(85)	103
Other	241	166
Changes in operating assets and liabilities:
Trade accounts receivable	(2,022)	1,559
Prepaid expenses and other current assets	(144)	(230)
Other long-term assets	(16)	425
Trade payables	(2,248)	(1,062)
Accrued expenses and other current liabilities	(3,000)	(652)
Deferred rent (lease incentives)		4,126
Deferred revenue	17,113	9,066
Net cash used in operating activities	(11,276)	(6,879)
Cash flows from investing activities:
Net (increase) decrease in customer fund assets	(4,585)	710
Cash paid for acquired intangible assets	(4,881)
Purchase of property and equipment	(8,169)	(6,115)
Net cash used in investing activities	(17,635)	(5,405)
Cash flows from financing activities:
Proceeds from initial public offering, net of underwriting discounts	192,510
Payments on credit facility	(33,000)
Proceeds from credit facility	23,000	5,000
Payments on capital leases		(14)
Repurchase of shares	(1,806)
Repayment of note payable	(234)
Payments of deferred financing costs	(622)
Taxes paid related to net share settlement of stock-based awards	(2,217)	(254)
Net increase (decrease) in customer fund obligations	4,585	(710)
Payment related to business combination earnouts		(83)
Proceeds from exercise of stock options and common stock warrants	5,580	514
Net cash provided by financing activities	187,796	4,453
Foreign currency effect on cash and cash equivalents	148	(96)
Net change in cash and cash equivalents	159,033	(7,927)
Cash and cash equivalents—Beginning of year	14,075	20,230
Cash and cash equivalents—End of year	173,108	12,303
Supplemental cash flow disclosures:
Cash paid for interest expense	1,787	1,012
Cash paid for income taxes	143	102
Non-cash investing and financing activities:
Property and equipment purchased under tenant improvement allowance	976
Property and equipment additions in accounts payable and accrued expenses	3,376	145
Deferred financing costs, accrued not yet paid	1,527	767
Cashless exercises of options and warrants	8,985	1,267
Cashless redemptions of options and warrants	$ 11,202	$ 1,521

Nature of Operations

Nature of Operations	6 Months Ended
	Jun. 30, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Nature of Operations	1. Nature of Operations Avalara, Inc. (the “Company”) provides software solutions that help businesses of all types and sizes comply with tax requirements for transactions worldwide. The Company offers a broad and growing suite of compliance solutions for transaction taxes, such as sales and use tax, value-added tax (VAT), excise tax, lodging tax, and communications tax. These solutions enable customers to automate the process of determining taxability, identifying applicable tax rates, determining and collecting taxes, preparing and filing returns, remitting taxes, maintaining tax records, and managing compliance documents. The Company, a Washington corporation, was originally incorporated in 1999 and is headquartered in Seattle, Washington. The Company has wholly owned subsidiaries in the United Kingdom, Belgium, India, and Brazil that provide business development, software development, and support services.

Significant Accounting Policies

Significant Accounting Policies	6 Months Ended
	Jun. 30, 2018
Accounting Policies [Abstract]
Significant Accounting Policies	2. Significant Accounting Policies Initial Public Offering In June 2018, the Company completed an initial public offering (“IPO”), in which the Company sold 8,625,000 shares of its common stock, including the full exercise of the underwriters’ option to purchase 1,125,000 additional shares of common stock, at the initial price to the public of $24.00 per share. The Company received net proceeds of $192.5 million, after deducting underwriting discounts and commissions and before deducting offering expenses paid and payable by the Company of $3.4 million. Immediately prior to the closing of the IPO, (1) all outstanding shares of preferred stock converted into shares of the Company’s common stock on a 2-to-1 basis, and (2) common stock warrants then outstanding were automatically net exercised into shares of the Company’s common stock. As of June 30, 2018, 66,457,650 shares of the Company’s common stock were outstanding. Interim Financial Information The accompanying consolidated financial statements were prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial information. Certain information and disclosures normally included in consolidated financial statements prepared in accordance with U.S. GAAP have been condensed or omitted. Accordingly, these consolidated financial statements should be read in conjunction with the audited consolidated financial statements and the related notes for the year ended December 31, 2017, included in our final prospectus related to our IPO dated June 14, 2018 (the “Prospectus”) filed with the SEC pursuant to Rule 424(b) under the Securities Act of 1933, as amended. The accompanying interim consolidated balance sheet as of June 30, 2018, the consolidated interim statements of operations for the three and six months ended June 30, 2018 and 2017, the consolidated statements of comprehensive loss for the three and six months ended June 30, 2018 and 2017, and the consolidated statements of cash flows for the six months ended June 30, 2018 and 2017, are unaudited. The unaudited interim consolidated financial statements have been prepared on a basis consistent with that used to prepare the audited annual consolidated financial statements and include, in the opinion of management, all adjustments, consisting of normal and recurring items, necessary for the fair presentation of the consolidated financial statements. The operating results for the six months ended June 30, 2018 are not necessarily indicative of the results expected for the full year ending December 31, 2018. Other than those described under Recently Adopted Accounting Standards, there have been no significant changes in the accounting policies from those disclosed in the audited consolidated financial statements and the related notes in the Prospectus. Reverse Stock Split On May 10, 2018, the Company effected a 2-to-1 reverse stock split of outstanding common stock, including outstanding stock options and common stock warrants. The par value of our common stock was not adjusted as a result of the reverse stock split. As a result of this amendment, the applicable conversion price was increased for each series of outstanding Series Preferred Stock. The increased conversion price effectively resulted in a 2-to-1 conversion ratio of Series Preferred Stock to common stock. All authorized, issued and outstanding shares of common stock, warrants for common stock, options to purchase common stock and the related per share amounts contained in these consolidated financial statements have been retroactively adjusted to reflect this reverse stock split for all periods presented. Principles of Consolidation The accompanying consolidated financial statements include those of the Company and its subsidiaries after elimination of all intercompany accounts and transactions. Segments The Company operates its business as one operating segment. Operating segments are defined as components of an enterprise about which separate financial information is evaluated regularly by the chief operating decision maker, the Company’s Chief Executive Officer, in deciding how to allocate resources and assess performance. The Company’s chief operating decision maker allocates resources and assesses performance based upon discrete financial information at the consolidated level. Use of Estimates The preparation of financial statements 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 consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. Actual results could materially differ from those estimates. Fair Value of Financial Instruments The Company applies the fair value measurement and disclosure provisions of the Accounting Standards Codification. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. A three-level fair value hierarchy prioritizes the inputs used to measure fair value. The hierarchy requires entities to maximize the use of observable inputs and minimize the use of unobservable inputs. The three levels of inputs used to measure fair value are as follows: Level 1 : Inputs are unadjusted quoted prices in active markets for identical assets or liabilities. Level 2 : Inputs are quoted prices for similar assets and liabilities in active markets or quoted prices for identical or similar instruments in markets that are not active and model-derived valuations in which all significant inputs and significant value drivers are observable in active markets. Level 3 : Inputs are unobservable inputs based on the Company’s assumptions and valuation techniques used to measure assets and liabilities at fair value. The inputs require significant management judgment or estimation. The Company’s assessment of the significance of an input to the fair value measurement requires judgment, which may affect the valuation of fair value assets and liabilities and their placement within the fair value hierarchy levels. The carrying amounts reported in the consolidated financial statements approximate the fair value for cash equivalents, trade accounts receivable, trade payables, and accrued expenses due to their short-term nature. The carrying amount of the Company’s term loan and revolving credit facility approximates fair value, considering the interest rates are based on the prime interest rate. Long-Lived Assets The Company evaluates long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying value of these assets may not be recoverable. An impairment is recognized in the event the carrying value of such assets exceeds their fair value. If the carrying value exceeds the fair value, then an impairment test is performed to determine the implied fair value. No impairment of long-lived assets occurred in the first half of 2018. Acquired Intangible Assets Acquired intangible assets consist of developed technology, customer relationships, noncompetition agreements, and tradenames and trademarks, resulting from the Company’s acquisitions. Acquired intangible assets are recorded at fair value on the date of acquisition and amortized over their estimated useful lives on a straight-line basis. Income Taxes The Company’s deferred tax assets are determined based on temporary differences between the financial reporting and income tax basis of assets and liabilities and are measured using the tax rates that will be in effect when the differences are expected to reverse. A valuation allowance is recorded when it is more likely than not that some of the deferred tax assets will not be realized. The Company assesses its income tax positions and records tax benefits based upon management’s evaluation of the facts, circumstances, and information available at the reporting date. The Company determines whether its uncertain tax positions are more likely than not to be sustained upon examination based on the technical merits of the position. For tax positions not meeting the more likely than not threshold, the tax amount recognized in the consolidated financial statements is reduced by the largest benefit that has a greater than 50% likelihood of being realized upon ultimate settlement with the relevant taxing authority. Stock-Based Compensation The Company accounts for stock-based compensation by calculating the fair value of each option or common stock warrant at the date of grant by applying the Black-Scholes option-pricing model. This model uses the fair value of the Company’s underlying common stock at the measurement date, the expected or contractual term of the option, the expected volatility of its common stock, risk-free interest rates, and expected dividend yield of its common stock. Recently Adopted Accounting Standards As an “emerging growth company,” the Jumpstart Our Business Startups Act, or the JOBS Act, allows the Company to delay adoption of new or revised accounting pronouncements applicable to public companies until such pronouncements are made applicable to private companies. The Company has elected to use the adoption dates applicable to private companies. As a result, the Company’s financial statements may not be comparable to the financial statements of issuers who are required to comply with the effective date for new or revised accounting standards that are applicable to public companies. In January 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2017-01 which clarifies the definition of a business. The guidance in ASU 2017-01 is required for annual reporting periods beginning after December 15, 2018 for business entities that are not public, with early adoption permitted. The Company early adopted ASU No. 2017-01 in conjunction with the asset acquisitions outlined in Note 5. New Accounting Standards Not Yet Adopted In May 2014, the FASB issued ASU No. 2014-09 which, along with subsequent ASUs, amends the existing accounting standards for revenue recognition. This guidance is based on principles that govern the recognition of revenue at an amount an entity expects to be entitled to receive when products are transferred to customers. ASU 2014-09 is effective for annual reporting periods beginning after December 15, 2017, including interim periods within that reporting period for public business entities, and for annual reporting periods beginning after December 15, 2018 for business entities that are not public. This guidance may be applied retrospectively to each prior period presented or retrospectively with the cumulative effect recognized as of the date of adoption. Additionally, the new guidance requires enhanced disclosures, including revenue recognition policies to identify performance obligations to customers and significant judgments in measurement and recognition. The Company is evaluating the impact of the adoption on its consolidated financial statements. The Company believes that adoption will require capitalization of certain selling costs that are currently expensed, such as sales and partner commissions, and the Company expects these adjustments could be material. The Company is continuing to assess the impact of adoption, which may identify other impacts on the Company’s financial statements. The Company expects to adopt and implement the new revenue recognition guidance effective January 1, 2019 using the modified retrospective approach. In February 2016, the FASB issued ASU No. 2016-02 which requires lessees to generally recognize most operating leases on the balance sheets but record expenses on the income statements in a manner similar to current accounting. The guidance is effective in 2020 for business entities that are not public with early adoption permitted. The Company is currently evaluating the impact this guidance will have on the Company’s financial statements. The Company currently expects that most operating lease commitments will be subject to the new standard and will be recognized as operating lease liabilities and right-of-use assets upon adoption. While the Company has not yet quantified the impact, these adjustments will increase total assets and total liabilities relative to such amounts reported prior to adoption. In August 2016, the FASB issued ASU No. 2016-15, related to classification of certain cash receipts and payments. ASU 2016-15 is intended to add or clarify guidance on the classification of certain cash receipts and payments in the statement of cash flows and to eliminate the diversity in practice related to such classifications. The guidance in ASU 2016-15 is required for annual reporting periods beginning after December 15, 2018 for business entities that are not public, with early adoption permitted. The Company is currently evaluating the impact this guidance will have on the Company’s consolidated financial statements. In November 2016, the FASB issued ASU, No. 2016-18, related to restricted cash, which is intended to add or clarify guidance on the classification and presentation of changes in restricted cash on the statement of cash flows and to eliminate the diversity in practice related to such classifications. The guidance in ASU 2016-18 is required for annual reporting periods ending after December 15, 2018, for business entities that are not public, with early adoption permitted. The Company is currently evaluating the impact this guidance will have on the Company’s consolidated financial statements.

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements	3. Fair Value Measurements Assets and liabilities measured at fair value on a recurring basis The fair value measurements of assets and liabilities recognized in the accompanying consolidated balance sheets measured at fair value on a recurring basis and the level within the fair value hierarchy in which the fair value measurements fall on dates presented as follows (in thousands): Fair Value Measurements Using Quoted Prices Significant in Active Other Significant Markets for Observable Unobservable Fair Identical Assets Inputs Inputs June 30, 2018 Value (Level 1) (Level 2) (Level 3) Money market funds $ 166,426 $ 166,426 Fair Value Measurements Using Quoted Prices Significant in Active Other Significant Markets for Observable Unobservable Fair Identical Assets Inputs Inputs December 31, 2017 Value (Level 1) (Level 2) (Level 3) Money market funds $ 10,261 $ 10,261 $ $ Earnout related to acquisitions 380 380 The Company uses the fair value hierarchy for financial assets and liabilities. The Company’s non-financial assets and liabilities, which include goodwill, intangible assets, and long-lived assets, are not required to be measured at fair value on a recurring basis. Earnout Liability The Company estimates the fair value of earnout liability using the probability-weighted discounted cash flow and Monte Carlo simulations. As of June 30, 2018 and December 31, 2017, the earnout liability associated with the 2016 acquisition of Gyori was valued utilizing a discount rate of 20% and 22%, respectively, and a risk-free rate based on linear interpolated U.S. Treasury rates commensurate with the term. Earnout liabilities are classified as Level 3 liabilities because the Company uses unobservable inputs to value them, reflecting its assessment of the assumptions market participants would use to value these liabilities. Changes in the fair value of earnout liability are recorded as other (income) expense, net in the consolidated statements of operations. A reconciliation of the beginning and ending balances of recurring fair value measurements recognized in the accompanying consolidated balance sheets using significant unobservable (Level 3) inputs, except for the earnout liability for VAT Applications, is as follows (in thousands): June 30, December 31, 2018 2017 Earnout liability: Balance beginning of period $ 380 $ 6,235 Payments of earnout liability - (2,101 ) Settlement of earnout liability - (3,051 ) Total unrealized (gains) losses included in other income (380 ) (703 ) Balance end of period $ - $ 380 Balance of earnout liability included in current liabilities (1) $ 2,969 $ 3,061 Balance of earnout liability included in noncurrent liabilities - 370 (1)

Balance Sheet Detail

Balance Sheet Detail	6 Months Ended
	Jun. 30, 2018
Balance Sheet Related Disclosures [Abstract]
Balance Sheet Detail	4 . Balance Sheet Detail Property and equipment, net consisted of the following (in thousands): Useful June 30, December 31, Life (Years) 2018 2017 Computer equipment and software 3 $ 11,998 $ 12,884 Internally developed software 6 3,105 2,512 Furniture and fixtures 5 5,852 4,459 Office equipment 5 599 622 Leasehold improvements 1 to 10 23,946 20,339 45,500 40,816 Accumulated depreciation (13,063 ) (15,422 ) Property and equipment—net $ 32,437 $ 25,394 Property and equipment assets are generally depreciated on a straight-line basis over the remaining estimated useful life of the asset or the lease term (for leasehold improvements), whichever is shorter. Depreciation expense was $1.6 million and $3.2 million for the three and six months ended June 30, 2018, respectively, and $1.2 Prepaid expenses and other current assets (in thousands): June 30, December 31, 2018 2017 Prepaid expenses $ 5,520 $ 5,077 Deferred financing costs — 1,575 Deposits 160 244 Other 695 120 Total $ 6,375 $ 7,016 Accrued expenses and trade payables consisted of the following (in thousands): June 30, December 31, 2018 2017 Accrued payroll and related taxes $ 11,176 $ 13,338 Accrued state, federal, and local taxes 915 1,044 Accrued referral source commissions 3,779 4,271 Trade payables 8,531 9,822 Earnout liabilities 2,969 3,061 Accrued financing costs 1,377 257 Accrued leasehold improvements 1,201 1,288 Other 6,403 5,083 Total $ 36,351 $ 38,164

Intangible Assets

Intangible Assets	6 Months Ended
	Jun. 30, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Intangible Assets	5 . Intangible Assets Finite-lived intangible assets consisted of the following (in thousands): June 30, 2018 Average Useful Life (Years) Gross Accumulated Amortization Net Customer relationships 3 to 10 $ 15,475 $ (8,276 ) $ 7,199 Developed technology 3 to 8 30,882 (15,570 ) 15,312 Noncompete agreements 3 to 5 574 (526 ) 48 Tradename and trademarks 1 to 4 420 (420 ) - $ 47,351 $ (24,792 ) $ 22,559 December 31, 2017 Average Useful Life (Years) Gross Accumulated Amortization Net Customer relationships 3 to 10 $ 15,270 $ (7,347 ) $ 7,923 Developed technology 3 to 8 24,781 (13,785 ) 10,996 Noncompete agreements 3 to 5 586 (446 ) 140 Tradename and trademarks 1 to 4 419 (404 ) 15 $ 41,056 $ (21,982 ) $ 19,074 Finite-lived intangible assets are generally amortized on a straight-line basis over the remaining estimated useful life as management believes that this reflects the expected benefit to be received from these assets. Finite-lived intangible assets amortization expense was $1.4 million and $2.8 million for the three and six months ended June 30, 2018, respectively, and $1.4 million and $2.8 million for the three and six months ended June 30, 2017, respectively. Acquisitions of finite-lived intangible assets In May 2018, the Company acquired certain intangible assets from Atlantax Systems, Inc (“Atlantax”) pursuant to a purchase arrangement structured to incent Atlantax to convert their existing customers to become Avalara customers. Total consideration for the purchase is based on an earnout computed on future revenue recognized by the Company over the next four years, up to a maximum of $1.9 million. At closing, the Company funded $0.4 million to Atlantax as a prepayment against future earnings. As of June 30, 2018, the total prepayment of $0.4 million was capitalized as a customer relationship intangible asset and will be amortized using an estimated useful life of five years. As future earnout payments become known, those costs will be capitalized as part of the customer relationship asset and amortized over the remaining useful life. The Company incurred immaterial legal costs related to the transaction that were capitalized as part of the customer relationship asset. In May 2018, the Company acquired developed technology to facilitate cross-border transactions (e.g., tariffs and duties), from Tradestream Technologies Inc. and Wise 24 Inc. (the “Sellers”) for cash and common stock. Total consideration for the purchase includes an earnout computed on future revenue and billings recognized by the Company over the next six years, up to a maximum of $30.0 million. The earnout will be payable in cash and common stock at the end of each six-month measurement period ending on June 30 or December 31 through 2023, with the first earnout period ending December 31, 2018. The cash portion of the earnout will be computed based on eligible billings in the measurement period. The number of shares of common stock to be issued will be computed based on the eligible revenue recognized in the measurement period divided by the average closing price of the Company’s common stock during the last ten days of the measurement period. At closing, the Company made a $1.5 million cash payment to the Sellers and made an additional $2.5 million cash payment in June 2018. Under the asset purchase agreement, the Company is also required to issue 113,122 shares of common stock as follows: 37,708 shares on November 29, 2018, 37,708 shares on May 29, 2019, and 37,706 shares on November 29, 2019. While the initial cash payments totaling $4.0 million are non-refundable, they are a prepayment against future earnout payments and will reduce the future cash portion of the earnout. The earnout payments, initial cash payments and equity issuances described above are all subject to clawback or set-off, as applicable, in the event of certain claims for which the Company is indemnified by the Sellers and their shareholders. The Company incurred approximately $0.1 million in legal costs related to the transaction that were capitalized as part of the developed technology asset. As of June 30, 2018, total consideration of $7.1 million, consisting of the cash paid, the fair value of the Company’s common stock on the date of the asset purchase, and the transaction costs incurred, was allocated to the acquired assets based on the relative fair value, consisting of a $6.6 million developed technology intangible asset that will be amortized using an estimated useful life of 6 years and a $0.5 million current other receivable for a refundable tax credit owed to the Company related to transfer taxes paid to the Sellers. As future earnout payments become due, those costs will be capitalized as part of the developed technology asset and amortized over the remaining useful life. Goodwill Changes in the carrying amount of goodwill through June 30, 2018 are summarized as follows (in thousands): Balance—January 1, 2018 $ 72,482 Cumulative translation adjustments (1,790 ) Balance—June 30, 2018 $ 70,692

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2018
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	6 . Commitments and Contingencies Leases Rent expense was $2.6 million and Contingencies Loss contingencies may arise in connection with the ordinary conduct of the Company’s business activities. The Company considers all loss contingencies on a quarterly basis and based on known facts assesses whether potential losses are considered reasonably possible, probable, and estimable. The Company establishes an accrual for loss contingencies when the loss is both probable and reasonably estimable. These accruals represent management’s best estimate of probable losses and, in such cases, there may be an exposure to loss in excess of the amounts accrued. Significant judgment is required to determine both likelihood of there being a probable loss and the estimated amount of a loss. If a loss contingency is not both probable and reasonably estimable, the Company does not establish an accrual, but will evaluate other disclosure requirements and continue to monitor the matter for developments that would make the loss contingency both probable and reasonably estimable. The ultimate outcome of any litigation relating to a loss contingency is uncertain and, regardless of outcome, litigation can have an adverse impact on the Company because of defense costs, negative publicity, diversion of management resources, and other factors. In its standard subscription agreements, the Company has agreed to indemnification provisions with respect to certain matters. Further, from time to time, the Company has also assumed indemnification obligations through its acquisition activity. These indemnification provisions can create a liability to the Company if its services do not appropriately calculate taxes due to tax jurisdictions, or if the Company is delinquent in the filing of returns on behalf of its customers. Although the Company’s agreements have disclaimers of warranties that limit its liability (beyond the amounts the Company agrees to pay pursuant to its indemnification obligations and guarantees, as applicable), a court could determine that such disclaimers and limitations are unenforceable as a matter of law and hold the Company liable for certain errors. Further, in some instances the Company has negotiated agreements with specific customers or assumed agreements in connection with the Company’s acquisitions that do not limit this liability or disclaim these warranties. It is not possible to reasonably estimate the potential loss under these indemnification arrangements. While the Company has never paid a material claim related to these indemnification provisions, the Company believes that, as of June 30, 2018, there is a reasonable possibility that a loss may be incurred pursuant to certain of these arrangements and estimates a range of loss of up to $2.0 million. The Company has not recorded an accrual related to these arrangements as of June 30, 2018 because it has not determined that a loss is probable. While no claim has been asserted against the Company, if such claim were made, the Company would vigorously defend itself. The ultimate outcome of these potential obligations is unknown, and it is possible that the actual losses could be higher than the estimated range.

Debt

Debt	6 Months Ended
	Jun. 30, 2018
Debt Disclosure [Abstract]
Debt	7 . Debt Loan and Security Agreement In November 2017, the Company amended its June 2016 loan and security agreement with Silicon Valley Bank and Ally Bank (the “Lenders”). The credit arrangements include a senior secured $30.0 million term loan facility and a $50.0 million revolving credit facility (collectively, the “Credit Facilities”). The $30.0 million term loan must be repaid in November 2020 with principal payments beginning December 2018. The $50.0 million revolving credit facility, which is subject to a borrowing base limitation and is reduced by outstanding letters of credit, must be repaid in November 2019. The obligations under the Credit Facilities are collateralized by substantially all the assets of the Company, including intellectual property, receivables and other tangible and intangible assets. Collectively, the Credit Facilities include several affirmative and negative covenants, including a requirement that the Company maintain minimum net billings and minimum liquidity and observe restrictions on dispositions of property, changes in its business, mergers or acquisitions, incurring indebtedness, and distributions or investments. Written consent of the Lenders is required to pay dividends to shareholders, with the exception of dividends payable in common stock. As of June 30, 2018, the Company was in compliance with all covenants of the Credit Facilities. The Company is required to pay a quarterly fee of 0.50% per annum on the undrawn portion available under the revolving credit facility plus the sum of outstanding letters of credit. Under the Credit Facilities, the interest rate on the term loan and the revolving credit facility is based on the greater of either 4.25% or the current prime rate plus 2.25% for the term loan and plus 1.75% for the revolving credit facility. Using a portion of the proceeds from the IPO, on June 20, 2018, the Company repaid $33.0 million of borrowings outstanding under the revolving credit facility. As of June 30, 2018, the Company had borrowings of $30.0 million outstanding under the term loan facility bearing interest at an annual rate of 7.25% and no borrowings outstanding under the revolving credit facility. In November 2017, Silicon Valley Bank issued a $2.5 million standby letter of credit under the Credit Facilities in connection with the lease agreement for the Company’s new corporate headquarters. As of June 30, 2018, after reducing for outstanding borrowings and letters of credit totaling $2.5 million, $47.5 million remained available for borrowing under the revolving credit facility. Outstanding borrowings consisted of the following (in thousands): June 30, December 31, 2018 2017 Current portion: Credit facilities $ 4,375 $ 625 Note payable - 234 Total current portion of long-term debt $ 4,375 $ 859 Noncurrent portion: Credit facilities 25,218 38,840 Total noncurrent portion of long-term debt $ 25,218 $ 38,840 Deferred financing fees, net of amortization, related to the Credit Facility are reflected as a direct reduction in the carrying amount of noncurrent debt in the balance sheet and the table above. As of June 30, 2018 and December 31, 2017, deferred financing fees, net of amortization, were $0.4 million and $0.5 million, respectively.

Convertible Preferred Stock and

Convertible Preferred Stock and Shareholders' Deficit	6 Months Ended
	Jun. 30, 2018
Stockholders Equity Note [Abstract]
Convertible Preferred Stock and Shareholders' Deficit	8 . Convertible Preferred Stock and Shareholders’ Equity (Deficit) Authorized Capital – Common Stock and Preferred Stock The Company is authorized to issue two classes of stock designated as common stock and preferred stock. In June 2018, immediately following the IPO, the Board of Directors approved the Amended and Restated Articles of Incorporation, which increased authorized capital stock from 260,290,986 shares, consisting of 153,944,895 shares of common stock, $0.0001 par value per share, and 106,346,091 shares of convertible preferred stock, $0.0001 par value per share, to authorized capital stock of 620,000,000 shares, consisting of 600,000,000 shares of common stock, $0.0001 par value per share, and 20,000,000 shares of undesignated preferred stock, $0.0001 par value per share. There were no changes to the rights and preferences of the common stock as a result of the IPO. Preferred Stock Immediately prior to the completion of the IPO, all outstanding shares of preferred stock converted into 50,888,014 shares of the Company’s common stock on a 2-to-1 basis. As of June 30, 2018, there were no shares of convertible preferred stock issued and outstanding. The changes to the Company’s convertible preferred stock and shareholders’ equity (deficit) for the six months ended June 30, 2018 is as follows (in thousands, except per share data): Accumulated Convertible Additional Other Total Preferred Stock Common Stock Paid-In Comprehensive Accumulated Shareholders’ Shares Amount Shares Amount Capital Income (Loss) Deficit Equity (Deficit) Balance at January 1, 2018 101,786,205 $ 370,921 5,992,293 $ 1 $ 18,121 $ 338 $ (412,052 ) $ (393,592 ) Proceeds from initial public offering, net of underwriters' discounts 8,625,000 1 192,509 192,510 Initial public offering costs (3,425 ) (3,425 ) Conversion of preferred stock to common stock (101,776,205 ) (370,854 ) 50,888,014 5 370,849 370,854 Shares tendered for cashless redemption (604,523 ) (11,198 ) (11,198 ) Exercise of stock options 1,091,713 8,777 8,777 Exercise of warrants 570,000 5,783 5,783 Stock-based compensation expense 7,088 7,088 Repurchase of shares (10,000 ) (67 ) (104,847 ) (1,738 ) (1,738 ) Loss on translation adjustment (2,445 ) (2,445 ) Shares issued to purchase intangible assets 2,555 2,555 Net loss (33,015 ) (33,015 ) Balance at June 30, 2018 - $ - 66,457,650 $ 7 $ 589,321 $ (2,107 ) $ (445,067 ) $ 142,154 In connection with the acquisition of intangible assets from Tradestream Technologies Inc. and Wise 24 Inc., the Company is required to issue 113,122 shares of common stock. The shares will be issued as follows: 37,708 shares on November 29, 2018, 37,708 shares on May 29, 2019, and 37,706 shares on November 29, 2019. See Note 5 for further discussion of the transaction. Common Stock Warrants Common stock warrants have typically been granted to members of the Company’s Board of Directors for services provided. During each of the six months ended June 30, 2018 and the year ended December 31, 2017, the Company issued 80,000 common stock warrants with weighted average exercise prices of $16.60 and $13.84 per share, respectively. The warrants granted to the Company’s Board of Directors had a grant date fair value of $0.5 million, which was recorded as general and administrative expense in each of the first six months of 2018 and 2017. During 2018 and prior to the completion of the IPO, 363,000

Equity Incentive Plans

Equity Incentive Plans	6 Months Ended
	Jun. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Equity Incentive Plans	9 . Equity Incentive Plans The Company has stock-based compensation plans that provide for the award of equity incentives, including stock options, stock bonuses, and restricted stock. As of June 30, 2018 and December 31, 2017, the Company had stock options outstanding under two stock-based compensation plans: the 2006 Equity Incentive Plan (the “2006 Plan”) and the Taxcient, Inc. 2005 Stock Option Plan (the “Taxcient Plan”). In April 2018, the Company’s Board of Directors adopted the 2018 Equity Incentive Plan (the “2018 Plan”). The 2018 Plan became effective in connection with the Company’s IPO and allows the Company to grant equity incentives to employees, non-employee directors, advisors, and consultants providing services to the Company. The 2018 Plan is administered by the Company’s Board of Directors and the Compensation and Leadership Development Committee of the Board of Directors. The total number of shares of common stock reserved for issuance under the 2018 Plan is equal to (1) 5,315,780 st The Company granted options under its 2006 Plan, as amended, through June 14, 2018, when the plan was terminated in connection with the Company’s IPO. Accordingly, no shares are available for future awards under this plan. Outstanding awards under the 2006 Plan continue to be subject to the terms and conditions of the 2006 Plan. As of June 30, 2018, there were 11,288,595 shares subject to outstanding awards under the 2006 Plan. As of December 31, 2017, there were 10,701,710 shares subject to outstanding awards and 2,857,533 shares were available for issuance under the 2006 Plan. In connection with the Company’s acquisition of Taxcient, Inc. (“Taxcient”) in 2010, the Company assumed the outstanding stock options issued by Taxcient under the Taxcient Plan, with appropriate adjustments to the number of shares and per share exercise prices in accordance with the merger agreement. At the time of the acquisition, the Company terminated the Taxcient Plan for purposes of future grants. As of each of June 30, 2018 and December 31, 2017, there were 25,124 shares subject to outstanding options under the Taxcient Plan, all of which were fully vested. The following table summarizes stock option activity for the Company’s stock-based compensation plans: Weighted Weighted Average Aggregate Average Remaining Intrinsic Exercise Contractual Value Shares Price Life (Years) (in thousands) Options outstanding as of January 1, 2018 10,727,125 $ 9.94 7.00 $ 71,430 Options granted 2,371,093 17.83 Options exercised (1,090,951 ) 8.04 Options cancelled (562,345 ) 14.01 Options expired (131,203 ) 11.07 Options outstanding as of June 30, 2018 11,313,719 11.56 7.23 473,001 Options exercisable as of June 30, 2018 6,223,513 $ 8.25 5.81 $ 280,791 A summary of options outstanding and vested as of June 30, 2018 is as follows: Options Outstanding Options Vested and Exercisable Exercise Number Weighted Average Number Vested Weighted Average Prices Outstanding Life (in Years) and Exercisable Life (in Years) $0.70 to 1.90 1,113,182 2.64 1,113,182 2.64 2.86 to 6.40 1,212,440 4.76 1,212,440 4.76 8.04 to 11.72 1,534,228 5.72 1,495,460 5.72 12.20 to 15.06 4,839,058 8.08 2,389,843 7.84 16.06 to 24.00 2,614,811 9.63 12,588 9.87 11,313,719 6,223,513 The total intrinsic value of options exercised during the six months ended June 30, 2018 and 2017 was $9.9 million and $2.0 million, respectively. The weighted average grant date fair value of options granted during the six months ended June 30, 2018 and 2017 was $8.09 and $6.40 per share, respectively. During the six months ended June 30, 2018 and 2017, 474,217 and Total stock-based compensation expense for stock options during the three and six months ended June 30, 2018 was $3.6 million and $6.6 million, respectively, and $2.7 Stock Option Valuation Assumptions All stock-based payments to employees are measured based on the grant date fair value of the awards and recognized in the consolidated statements of operations over the period during which the employee is required to perform services in exchange for the award, generally a four-year, straight-line vesting period. For the periods presented, the fair value of options was estimated using the Black-Scholes option-pricing model with the following assumptions: June 30, June 30, 2018 2017 Fair value of common stock $16.86 to 24.00 $13.84 to 14.68 Volatility 40% 40 to 43% Expected term 6 years 6 years Expected dividend yield n/a n/a Risk-free interest rate 2.55% to 2.97% 2.02% to 2.20% The Board of Directors intends all options granted to be exercisable at a price per share not less than the per share fair value of the Company’s common stock underlying those options on the date of grant. Prior to the IPO, the fair value of the common stock underlying stock options and common stock warrants was estimated by the Board of Directors, with input from management and third-party valuation firms. The enterprise value utilized in determining the fair value of common stock for financial reporting purposes was estimated using the market approach and the income approach. Under the market approach, the Company used the guideline public company method, which estimated the fair value of the business enterprise based on market prices of stock of guideline public companies and the option pricing method. Indications of value were estimated by utilizing revenue multiples to measure enterprise value. The guideline merged and acquired company method was not utilized in the valuation, as the Company regarded the method as less reliable as management believed it did not directly reflect the Company’s future prospects. The income approach estimated the enterprise value based on the present value of the Company’s future estimated cash flows and the residual value beyond the forecast period. The residual value was based on an exit (or terminal) multiple observed in the comparable company method analysis. The future cash flows and residual value were discounted to their present value to reflect the risks inherent in the Company achieving these estimated cash flows. The discount rate was based on venture capital rates of return for companies nearing an initial public offering. The discount rate was applied using the mid-year convention. The mid-year convention assumes that cash flows are generated evenly throughout the year, as opposed to in a lump sum at the end of the year. The Company lacks sufficient historical volatility of its stock price. Selected volatility is representative of expected future volatility and was based on the historical and implied volatility of comparable publicly traded companies over a similar expected term. The expected term represents the period that the Company’s stock-based awards are expected to be outstanding. Given the Company’s relative inexperience of significant exercise activity, the expected term assumptions were determined based on application of the simplified method of expected term calculation by averaging the vesting contractual life of option grants and the vesting period of such grants. This application, when coupled with the contractual life of 10 years and average vesting term of 4 years, creates an expected term of 6 years. The Company has not paid and does not expect to pay dividends. The risk-free interest rate was based on the rate for a U.S. Treasury zero-coupon issue with a term that closely approximates the expected life of the option grant at the date nearest the option grant date. The compensation expense recorded for the Company’s fully vested stock compensation grants represents the grant date fair value of the total vested number of awards. The Company uses the straight-line attribution method for recognizing stock-based compensation expense. 2018 Employee Stock Purchase Plan In June 2018, the Company’s Board of Directors adopted our 2018 Employee Stock Purchase Plan (“ESPP”). The ESPP became effective on June 15, 2018, the first trading day of our common stock. The ESPP is intended to qualify as an employee stock purchase plan under Section 423 of the Internal Revenue Code of 1986, as amended. Purchases will be accomplished through participation in discrete offering periods. The first offering period began on June 14, 2018 and will end on January 31, 2019. Thereafter, offering periods will begin on August 1 and February 1 (or such other date determined by our Board of Directors or our Compensation and Leadership Development Committee). Under the ESPP, eligible employees can acquire shares of the Company’s common stock by accumulating funds through payroll deductions. Employees generally are eligible to participate in our ESPP if they are a U.S. employee and are employed for at least 20 hours per week. The Company may impose additional restrictions on eligibility. Eligible employees can select a rate of payroll deduction between 1% and 15% of their compensation. The purchase price for shares of common stock purchased under the ESPP is 85% of the lesser of the fair market value of the Company’s common stock on (i) the first day of the applicable offering period or (ii) the last day of the purchase period in the applicable offering period. An employee’s participation automatically ends upon termination of employment for any reason. The Company initially reserved 996,709 shares of common stock for sale under the ESPP. The aggregate number of shares reserved for sale under the ESPP will increase automatically on each January 1, beginning January 1, 2019, by the number of shares equal to least of (i) 1,000,000 shares of common stock, (ii) 1% of the aggregate number of shares of common stock outstanding on December 31 st Stock-based compensation expense recorded to the condensed consolidated statement of operations for the three and six months ended June 30, 2018 related to the ESPP was insignificant.

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	1 0 . Income Taxes The Company used an annual effective tax rate approach to calculate income taxes for the six months ended June 30, 2018 and 2017. The annual effective tax rate differs from the U.S. Federal statutory rate due primarily to providing a valuation allowance on deferred tax assets. Income taxes for international operations were not material for the six months ended June 30, 2018 and 2017. The effective income tax rate was a benefit of 2.2% and 0.9% for the six months ended June 30, 2018 and 2017, respectively. The difference is due primarily to an update to the provisional amount recorded as of December 31, 2017. The Company determined that indefinite lived goodwill would provide a source of income to realize indefinite lived deferred tax assets resulting in tax benefit of $0.9 million during the six months ended June 30, 2018. The Company continues to analyze changes under the Tax Act and anticipates recording any additional resulting adjustments within the measurement period.

Net Loss Per Share Attributable

Net Loss Per Share Attributable to Common Shareholders	6 Months Ended
	Jun. 30, 2018
Earnings Per Share [Abstract]
Net Loss Per Share Attributable to Common Shareholders	1 1 . Net Loss Per Share Attributable to Common Shareholders The Company calculates basic and diluted net loss per share attributable to common shareholders in conformity with the two-class method required for companies with participating securities. The Company considered all series of convertible preferred stock to be participating securities. Under the two-class method, the net loss attributable to common shareholders was not allocated to the convertible preferred stock as the holders of convertible preferred stock did not have a contractual obligation to share in losses. The diluted net loss per share attributable to common shareholders is computed by giving effect to all potential dilutive common stock equivalents outstanding for the period. For purposes of this calculation, convertible preferred stock, options to purchase common stock and warrants to purchase common stock are considered common stock equivalents but have been excluded from the calculation of diluted net loss per share attributable to common shareholders as their effect is antidilutive. Basic and diluted net loss per common share was the same for each period presented, as the inclusion of all potential common shares outstanding would have been antidilutive. The following table sets forth the computation of basic and diluted net loss per common share (in thousands, except per share amounts): For the Three Months Ended June 30, For the Six Months Ended June 30, 2018 2017 2018 2017 Numerator: Net loss attributable to common shareholders $ (17,766 ) $ (15,449 ) $ (33,015 ) $ (31,447 ) Denominator: Weighted-average common shares outstanding-basic 14,383 5,494 10,299 5,442 Dilutive effect of share equivalents resulting from stock options, common stock warrants and convertible preferred shares (as converted) - - - - Weighted-average common shares outstanding-diluted 14,383 5,494 10,299 5,442 Net loss per common share, basic and diluted $ (1.24 ) $ (2.81 ) $ (3.21 ) $ (5.78 ) The following weighted-average outstanding shares of common stock equivalents were excluded from the computation of diluted net loss per share attributable to common shareholders for the periods presented because the impact of including them would have been antidilutive (in thousands): For the Three Months Ended June 30, For the Six Months Ended June 30, 2018 2017 2018 2017 Options to purchase common shares 11,151 10,616 11,218 10,189 Common stock warrants 401 661 475 671 Convertible preferred shares (as converted) 44,178 50,893 47,515 50,893 Total 55,730 62,170 59,208 61,753

Significant Accounting Polici18

Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2018
Accounting Policies [Abstract]
Initial Public Offering	Initial Public Offering In June 2018, the Company completed an initial public offering (“IPO”), in which the Company sold 8,625,000 shares of its common stock, including the full exercise of the underwriters’ option to purchase 1,125,000 additional shares of common stock, at the initial price to the public of $24.00 per share. The Company received net proceeds of $192.5 million, after deducting underwriting discounts and commissions and before deducting offering expenses paid and payable by the Company of $3.4 million. Immediately prior to the closing of the IPO, (1) all outstanding shares of preferred stock converted into shares of the Company’s common stock on a 2-to-1 basis, and (2) common stock warrants then outstanding were automatically net exercised into shares of the Company’s common stock. As of June 30, 2018, 66,457,650 shares of the Company’s common stock were outstanding.
Interim Financial Information	Interim Financial Information The accompanying consolidated financial statements were prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial information. Certain information and disclosures normally included in consolidated financial statements prepared in accordance with U.S. GAAP have been condensed or omitted. Accordingly, these consolidated financial statements should be read in conjunction with the audited consolidated financial statements and the related notes for the year ended December 31, 2017, included in our final prospectus related to our IPO dated June 14, 2018 (the “Prospectus”) filed with the SEC pursuant to Rule 424(b) under the Securities Act of 1933, as amended. The accompanying interim consolidated balance sheet as of June 30, 2018, the consolidated interim statements of operations for the three and six months ended June 30, 2018 and 2017, the consolidated statements of comprehensive loss for the three and six months ended June 30, 2018 and 2017, and the consolidated statements of cash flows for the six months ended June 30, 2018 and 2017, are unaudited. The unaudited interim consolidated financial statements have been prepared on a basis consistent with that used to prepare the audited annual consolidated financial statements and include, in the opinion of management, all adjustments, consisting of normal and recurring items, necessary for the fair presentation of the consolidated financial statements. The operating results for the six months ended June 30, 2018 are not necessarily indicative of the results expected for the full year ending December 31, 2018. Other than those described under Recently Adopted Accounting Standards, there have been no significant changes in the accounting policies from those disclosed in the audited consolidated financial statements and the related notes in the Prospectus.
Reverse Stock Split	Reverse Stock Split On May 10, 2018, the Company effected a 2-to-1 reverse stock split of outstanding common stock, including outstanding stock options and common stock warrants. The par value of our common stock was not adjusted as a result of the reverse stock split. As a result of this amendment, the applicable conversion price was increased for each series of outstanding Series Preferred Stock. The increased conversion price effectively resulted in a 2-to-1 conversion ratio of Series Preferred Stock to common stock. All authorized, issued and outstanding shares of common stock, warrants for common stock, options to purchase common stock and the related per share amounts contained in these consolidated financial statements have been retroactively adjusted to reflect this reverse stock split for all periods presented.
Principles of Consolidation	Principles of Consolidation The accompanying consolidated financial statements include those of the Company and its subsidiaries after elimination of all intercompany accounts and transactions.
Segments	Segments The Company operates its business as one operating segment. Operating segments are defined as components of an enterprise about which separate financial information is evaluated regularly by the chief operating decision maker, the Company’s Chief Executive Officer, in deciding how to allocate resources and assess performance. The Company’s chief operating decision maker allocates resources and assesses performance based upon discrete financial information at the consolidated level.
Use of Estimates	Use of Estimates The preparation of financial statements 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 consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. Actual results could materially differ from those estimates.
Fair Value of Financial Instruments	Fair Value of Financial Instruments The Company applies the fair value measurement and disclosure provisions of the Accounting Standards Codification. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. A three-level fair value hierarchy prioritizes the inputs used to measure fair value. The hierarchy requires entities to maximize the use of observable inputs and minimize the use of unobservable inputs. The three levels of inputs used to measure fair value are as follows: Level 1 : Inputs are unadjusted quoted prices in active markets for identical assets or liabilities. Level 2 : Inputs are quoted prices for similar assets and liabilities in active markets or quoted prices for identical or similar instruments in markets that are not active and model-derived valuations in which all significant inputs and significant value drivers are observable in active markets. Level 3 : Inputs are unobservable inputs based on the Company’s assumptions and valuation techniques used to measure assets and liabilities at fair value. The inputs require significant management judgment or estimation. The Company’s assessment of the significance of an input to the fair value measurement requires judgment, which may affect the valuation of fair value assets and liabilities and their placement within the fair value hierarchy levels. The carrying amounts reported in the consolidated financial statements approximate the fair value for cash equivalents, trade accounts receivable, trade payables, and accrued expenses due to their short-term nature. The carrying amount of the Company’s term loan and revolving credit facility approximates fair value, considering the interest rates are based on the prime interest rate.
Long-Lived Assets	Long-Lived Assets The Company evaluates long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying value of these assets may not be recoverable. An impairment is recognized in the event the carrying value of such assets exceeds their fair value. If the carrying value exceeds the fair value, then an impairment test is performed to determine the implied fair value. No impairment of long-lived assets occurred in the first half of 2018.
Acquired Intangible Assets	Acquired Intangible Assets Acquired intangible assets consist of developed technology, customer relationships, noncompetition agreements, and tradenames and trademarks, resulting from the Company’s acquisitions. Acquired intangible assets are recorded at fair value on the date of acquisition and amortized over their estimated useful lives on a straight-line basis.
Income Taxes	Income Taxes The Company’s deferred tax assets are determined based on temporary differences between the financial reporting and income tax basis of assets and liabilities and are measured using the tax rates that will be in effect when the differences are expected to reverse. A valuation allowance is recorded when it is more likely than not that some of the deferred tax assets will not be realized. The Company assesses its income tax positions and records tax benefits based upon management’s evaluation of the facts, circumstances, and information available at the reporting date. The Company determines whether its uncertain tax positions are more likely than not to be sustained upon examination based on the technical merits of the position. For tax positions not meeting the more likely than not threshold, the tax amount recognized in the consolidated financial statements is reduced by the largest benefit that has a greater than 50% likelihood of being realized upon ultimate settlement with the relevant taxing authority.
Stock-Based Compensation	Stock-Based Compensation The Company accounts for stock-based compensation by calculating the fair value of each option or common stock warrant at the date of grant by applying the Black-Scholes option-pricing model. This model uses the fair value of the Company’s underlying common stock at the measurement date, the expected or contractual term of the option, the expected volatility of its common stock, risk-free interest rates, and expected dividend yield of its common stock.
Recently Adopted Accounting Standards and New Accounting Standards Not Yet Adopted	Recently Adopted Accounting Standards As an “emerging growth company,” the Jumpstart Our Business Startups Act, or the JOBS Act, allows the Company to delay adoption of new or revised accounting pronouncements applicable to public companies until such pronouncements are made applicable to private companies. The Company has elected to use the adoption dates applicable to private companies. As a result, the Company’s financial statements may not be comparable to the financial statements of issuers who are required to comply with the effective date for new or revised accounting standards that are applicable to public companies. In January 2017, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2017-01 which clarifies the definition of a business. The guidance in ASU 2017-01 is required for annual reporting periods beginning after December 15, 2018 for business entities that are not public, with early adoption permitted. The Company early adopted ASU No. 2017-01 in conjunction with the asset acquisitions outlined in Note 5. New Accounting Standards Not Yet Adopted In May 2014, the FASB issued ASU No. 2014-09 which, along with subsequent ASUs, amends the existing accounting standards for revenue recognition. This guidance is based on principles that govern the recognition of revenue at an amount an entity expects to be entitled to receive when products are transferred to customers. ASU 2014-09 is effective for annual reporting periods beginning after December 15, 2017, including interim periods within that reporting period for public business entities, and for annual reporting periods beginning after December 15, 2018 for business entities that are not public. This guidance may be applied retrospectively to each prior period presented or retrospectively with the cumulative effect recognized as of the date of adoption. Additionally, the new guidance requires enhanced disclosures, including revenue recognition policies to identify performance obligations to customers and significant judgments in measurement and recognition. The Company is evaluating the impact of the adoption on its consolidated financial statements. The Company believes that adoption will require capitalization of certain selling costs that are currently expensed, such as sales and partner commissions, and the Company expects these adjustments could be material. The Company is continuing to assess the impact of adoption, which may identify other impacts on the Company’s financial statements. The Company expects to adopt and implement the new revenue recognition guidance effective January 1, 2019 using the modified retrospective approach. In February 2016, the FASB issued ASU No. 2016-02 which requires lessees to generally recognize most operating leases on the balance sheets but record expenses on the income statements in a manner similar to current accounting. The guidance is effective in 2020 for business entities that are not public with early adoption permitted. The Company is currently evaluating the impact this guidance will have on the Company’s financial statements. The Company currently expects that most operating lease commitments will be subject to the new standard and will be recognized as operating lease liabilities and right-of-use assets upon adoption. While the Company has not yet quantified the impact, these adjustments will increase total assets and total liabilities relative to such amounts reported prior to adoption. In August 2016, the FASB issued ASU No. 2016-15, related to classification of certain cash receipts and payments. ASU 2016-15 is intended to add or clarify guidance on the classification of certain cash receipts and payments in the statement of cash flows and to eliminate the diversity in practice related to such classifications. The guidance in ASU 2016-15 is required for annual reporting periods beginning after December 15, 2018 for business entities that are not public, with early adoption permitted. The Company is currently evaluating the impact this guidance will have on the Company’s consolidated financial statements. In November 2016, the FASB issued ASU, No. 2016-18, related to restricted cash, which is intended to add or clarify guidance on the classification and presentation of changes in restricted cash on the statement of cash flows and to eliminate the diversity in practice related to such classifications. The guidance in ASU 2016-18 is required for annual reporting periods ending after December 15, 2018, for business entities that are not public, with early adoption permitted. The Company is currently evaluating the impact this guidance will have on the Company’s consolidated financial statements.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2018
Fair Value Disclosures [Abstract]
Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis	The fair value measurements of assets and liabilities recognized in the accompanying consolidated balance sheets measured at fair value on a recurring basis and the level within the fair value hierarchy in which the fair value measurements fall on dates presented as follows (in thousands): Fair Value Measurements Using Quoted Prices Significant in Active Other Significant Markets for Observable Unobservable Fair Identical Assets Inputs Inputs June 30, 2018 Value (Level 1) (Level 2) (Level 3) Money market funds $ 166,426 $ 166,426 Fair Value Measurements Using Quoted Prices Significant in Active Other Significant Markets for Observable Unobservable Fair Identical Assets Inputs Inputs December 31, 2017 Value (Level 1) (Level 2) (Level 3) Money market funds $ 10,261 $ 10,261 $ $ Earnout related to acquisitions 380 380
Summary of Reconciliation of Beginning and Ending Balances of Recurring Fair Value Measurements	A reconciliation of the beginning and ending balances of recurring fair value measurements recognized in the accompanying consolidated balance sheets using significant unobservable (Level 3) inputs, except for the earnout liability for VAT Applications, is as follows (in thousands): June 30, December 31, 2018 2017 Earnout liability: Balance beginning of period $ 380 $ 6,235 Payments of earnout liability - (2,101 ) Settlement of earnout liability - (3,051 ) Total unrealized (gains) losses included in other income (380 ) (703 ) Balance end of period $ - $ 380 Balance of earnout liability included in current liabilities (1) $ 2,969 $ 3,061 Balance of earnout liability included in noncurrent liabilities - 370 (1)

Balance Sheet Detail (Tables)

Balance Sheet Detail (Tables)	6 Months Ended
	Jun. 30, 2018
Balance Sheet Related Disclosures [Abstract]
Schedule of Property and Equipment, Net	Property and equipment, net consisted of the following (in thousands): Useful June 30, December 31, Life (Years) 2018 2017 Computer equipment and software 3 $ 11,998 $ 12,884 Internally developed software 6 3,105 2,512 Furniture and fixtures 5 5,852 4,459 Office equipment 5 599 622 Leasehold improvements 1 to 10 23,946 20,339 45,500 40,816 Accumulated depreciation (13,063 ) (15,422 ) Property and equipment—net $ 32,437 $ 25,394
Schedule of Prepaid Expense and Other Current Assets	Prepaid expenses and other current assets (in thousands): June 30, December 31, 2018 2017 Prepaid expenses $ 5,520 $ 5,077 Deferred financing costs — 1,575 Deposits 160 244 Other 695 120 Total $ 6,375 $ 7,016
Schedule of Accrued Expenses and Trade Payables	Accrued expenses and trade payables consisted of the following (in thousands): June 30, December 31, 2018 2017 Accrued payroll and related taxes $ 11,176 $ 13,338 Accrued state, federal, and local taxes 915 1,044 Accrued referral source commissions 3,779 4,271 Trade payables 8,531 9,822 Earnout liabilities 2,969 3,061 Accrued financing costs 1,377 257 Accrued leasehold improvements 1,201 1,288 Other 6,403 5,083 Total $ 36,351 $ 38,164

Intangible Assets (Tables)

Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Schedule of Finite-lived Intangible Assets	Finite-lived intangible assets consisted of the following (in thousands): June 30, 2018 Average Useful Life (Years) Gross Accumulated Amortization Net Customer relationships 3 to 10 $ 15,475 $ (8,276 ) $ 7,199 Developed technology 3 to 8 30,882 (15,570 ) 15,312 Noncompete agreements 3 to 5 574 (526 ) 48 Tradename and trademarks 1 to 4 420 (420 ) - $ 47,351 $ (24,792 ) $ 22,559 December 31, 2017 Average Useful Life (Years) Gross Accumulated Amortization Net Customer relationships 3 to 10 $ 15,270 $ (7,347 ) $ 7,923 Developed technology 3 to 8 24,781 (13,785 ) 10,996 Noncompete agreements 3 to 5 586 (446 ) 140 Tradename and trademarks 1 to 4 419 (404 ) 15 $ 41,056 $ (21,982 ) $ 19,074
Schedule of Changes in Carrying Amount of Goodwill	Changes in the carrying amount of goodwill through June 30, 2018 are summarized as follows (in thousands): Balance—January 1, 2018 $ 72,482 Cumulative translation adjustments (1,790 ) Balance—June 30, 2018 $ 70,692

Debt (Tables)

Debt (Tables)	6 Months Ended
	Jun. 30, 2018
Debt Disclosure [Abstract]
Schedule of Outstanding Borrowings	Outstanding borrowings consisted of the following (in thousands): June 30, December 31, 2018 2017 Current portion: Credit facilities $ 4,375 $ 625 Note payable - 234 Total current portion of long-term debt $ 4,375 $ 859 Noncurrent portion: Credit facilities 25,218 38,840 Total noncurrent portion of long-term debt $ 25,218 $ 38,840

Convertible Preferred Stock a23

Convertible Preferred Stock and Shareholders’ Deficit (Tables)	6 Months Ended
	Jun. 30, 2018
Stockholders Equity Note [Abstract]
Summary of Changes of Convertible Preferred Stock and Shareholders' Deficit	The changes to the Company’s convertible preferred stock and shareholders’ equity (deficit) for the six months ended June 30, 2018 is as follows (in thousands, except per share data): Accumulated Convertible Additional Other Total Preferred Stock Common Stock Paid-In Comprehensive Accumulated Shareholders’ Shares Amount Shares Amount Capital Income (Loss) Deficit Equity (Deficit) Balance at January 1, 2018 101,786,205 $ 370,921 5,992,293 $ 1 $ 18,121 $ 338 $ (412,052 ) $ (393,592 ) Proceeds from initial public offering, net of underwriters' discounts 8,625,000 1 192,509 192,510 Initial public offering costs (3,425 ) (3,425 ) Conversion of preferred stock to common stock (101,776,205 ) (370,854 ) 50,888,014 5 370,849 370,854 Shares tendered for cashless redemption (604,523 ) (11,198 ) (11,198 ) Exercise of stock options 1,091,713 8,777 8,777 Exercise of warrants 570,000 5,783 5,783 Stock-based compensation expense 7,088 7,088 Repurchase of shares (10,000 ) (67 ) (104,847 ) (1,738 ) (1,738 ) Loss on translation adjustment (2,445 ) (2,445 ) Shares issued to purchase intangible assets 2,555 2,555 Net loss (33,015 ) (33,015 ) Balance at June 30, 2018 - $ - 66,457,650 $ 7 $ 589,321 $ (2,107 ) $ (445,067 ) $ 142,154

Equity Incentive Plans (Tables)

Equity Incentive Plans (Tables)	6 Months Ended
	Jun. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Summary of Stock Option Activity	The following table summarizes stock option activity for the Company’s stock-based compensation plans: Weighted Weighted Average Aggregate Average Remaining Intrinsic Exercise Contractual Value Shares Price Life (Years) (in thousands) Options outstanding as of January 1, 2018 10,727,125 $ 9.94 7.00 $ 71,430 Options granted 2,371,093 17.83 Options exercised (1,090,951 ) 8.04 Options cancelled (562,345 ) 14.01 Options expired (131,203 ) 11.07 Options outstanding as of June 30, 2018 11,313,719 11.56 7.23 473,001 Options exercisable as of June 30, 2018 6,223,513 $ 8.25 5.81 $ 280,791
Summary of Options Outstanding and Vested by Range of Exercise Prices	A summary of options outstanding and vested as of June 30, 2018 is as follows: Options Outstanding Options Vested and Exercisable Exercise Number Weighted Average Number Vested Weighted Average Prices Outstanding Life (in Years) and Exercisable Life (in Years) $0.70 to 1.90 1,113,182 2.64 1,113,182 2.64 2.86 to 6.40 1,212,440 4.76 1,212,440 4.76 8.04 to 11.72 1,534,228 5.72 1,495,460 5.72 12.20 to 15.06 4,839,058 8.08 2,389,843 7.84 16.06 to 24.00 2,614,811 9.63 12,588 9.87 11,313,719 6,223,513
Summary of Fair Value Options Estimated Using Black-Scholes Option Pricing Model Assumptions	For the periods presented, the fair value of options was estimated using the Black-Scholes option-pricing model with the following assumptions: June 30, June 30, 2018 2017 Fair value of common stock $16.86 to 24.00 $13.84 to 14.68 Volatility 40% 40 to 43% Expected term 6 years 6 years Expected dividend yield n/a n/a Risk-free interest rate 2.55% to 2.97% 2.02% to 2.20%

Net Loss Per Share Attributab25

Net Loss Per Share Attributable to Common Shareholders (Tables)	6 Months Ended
	Jun. 30, 2018
Earnings Per Share [Abstract]
Schedule of Computation of Basic and Diluted Net Loss Per Common Share	The following table sets forth the computation of basic and diluted net loss per common share (in thousands, except per share amounts): For the Three Months Ended June 30, For the Six Months Ended June 30, 2018 2017 2018 2017 Numerator: Net loss attributable to common shareholders $ (17,766 ) $ (15,449 ) $ (33,015 ) $ (31,447 ) Denominator: Weighted-average common shares outstanding-basic 14,383 5,494 10,299 5,442 Dilutive effect of share equivalents resulting from stock options, common stock warrants and convertible preferred shares (as converted) - - - - Weighted-average common shares outstanding-diluted 14,383 5,494 10,299 5,442 Net loss per common share, basic and diluted $ (1.24 ) $ (2.81 ) $ (3.21 ) $ (5.78 )
Schedule of Weighted-Average Outstanding Shares of Common Stock Equivalents Were Excluded from Computation of Diluted Net Loss Per Share	The following weighted-average outstanding shares of common stock equivalents were excluded from the computation of diluted net loss per share attributable to common shareholders for the periods presented because the impact of including them would have been antidilutive (in thousands): For the Three Months Ended June 30, For the Six Months Ended June 30, 2018 2017 2018 2017 Options to purchase common shares 11,151 10,616 11,218 10,189 Common stock warrants 401 661 475 671 Convertible preferred shares (as converted) 44,178 50,893 47,515 50,893 Total 55,730 62,170 59,208 61,753

Significant Accounting Polici26

Significant Accounting Policies - Additional Information (Details)	May 10, 2018	Jun. 30, 2018USD ($)$ / sharesshares	Jun. 30, 2018USD ($)Segment$ / sharesshares	Dec. 31, 2017shares
Accounting Policies [Line Items]
Proceeds from initial public offering, net of underwriting discounts			$ 192,510,000
Offering expenses paid and payable			$ 3,425,000
Common stock, shares, outstanding | shares		66,458,000	66,458,000	5,992,000
Number of operating segment | Segment			1
Impairment of long-lived assets			$ 0
Tax position likely of being realized upon ultimate settlement			greater than 50%
Percentage of likelihood of realization of tax position upon ultimate settlement, minimum		50.00%	50.00%
Common Stock
Accounting Policies [Line Items]
Number of common stock sold | shares			8,625,000
Preferred stock, conversion basis	2-to-1		2-to-1
Reverse stock split	0.5	0.5
Initial Public Offering | Common Stock
Accounting Policies [Line Items]
Number of common stock sold | shares		8,625,000
Common stock price per share | $ / shares		$ 24	$ 24
Proceeds from initial public offering, net of underwriting discounts		$ 192,500,000
Offering expenses paid and payable		$ 3,400,000
Underwriters | Common Stock
Accounting Policies [Line Items]
Number of common stock sold | shares		1,125,000

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Recurring Basis - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Earnout Related to Acquisitions
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value, Liabilities		$ 380
Significant Unobservable Inputs (Level 3) | Earnout Related to Acquisitions
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value, Liabilities		380
Money Market Funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value, Assets	$ 166,426	10,261
Money Market Funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value, Assets	$ 166,426	$ 10,261

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Details)	Jun. 30, 2018	Dec. 31, 2017
Discount Rate | Discounted Cash Flow and Monte Carlo Simulations
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Discount rate utilized for valuation of earnout liability	20.00%	22.00%

Fair Value Measurements - Summa

Fair Value Measurements - Summary of Reconciliation of Beginning and Ending Balances of Recurring Fair Value Measurements (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Earnout liability:
Balance of earnout liability included in current liabilities	$ 2,969	$ 3,061
Recurring Basis | Significant Unobservable Inputs (Level 3) | Earnout Related to Acquisitions
Earnout liability:
Balance beginning of period	380	6,235
Payments of earnout liability		(2,101)
Settlement of earnout liability		(3,051)
Total unrealized (gains) losses included in other income	(380)	(703)
Balance end of period		380
Balance of earnout liability included in current liabilities	$ 2,969	3,061
Balance of earnout liability included in noncurrent liabilities		$ 370

Fair Value Measurements - Sum30

Fair Value Measurements - Summary of Reconciliation of Beginning and Ending Balances of Recurring Fair Value Measurements (Parenthetical) (Details) € in Millions, $ in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2018USD ($)	Jun. 30, 2018EUR (€)	Dec. 31, 2017USD ($)
Recurring Basis | Significant Unobservable Inputs (Level 3) | Current Liabilities
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Settlement of earnout liability for VAT applications	$ 3	€ 2.5	$ 3.1

Balance Sheet Detail - Property

Balance Sheet Detail - Property and Equipment, Net (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 45,500	$ 40,816
Accumulated depreciation	(13,063)	(15,422)
Property and equipment—net	32,437	25,394
Computer Equipment and Software
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 11,998	12,884
Property and equipment, Useful Life	3 years
Internally Developed Software
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 3,105	2,512
Property and equipment, Useful Life	6 years
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 5,852	4,459
Property and equipment, Useful Life	5 years
Office Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 599	622
Property and equipment, Useful Life	5 years
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 23,946	$ 20,339
Leasehold Improvements | Minimum
Property Plant And Equipment [Line Items]
Property and equipment, Useful Life	1 year
Leasehold Improvements | Maximum
Property Plant And Equipment [Line Items]
Property and equipment, Useful Life	10 years

Balance Sheet Detail - Addition

Balance Sheet Detail - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Balance Sheet Related Disclosures [Abstract]
Depreciation expense	$ 1.6	$ 1.2	$ 3.2	$ 2.4

Balance Sheet Detail - Prepaid

Balance Sheet Detail - Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Prepaid Expense And Other Assets Current [Abstract]
Prepaid expenses	$ 5,520	$ 5,077
Deferred financing costs		1,575
Deposits	160	244
Other	695	120
Total	$ 6,375	$ 7,016

Balance Sheet Detail - Accrued

Balance Sheet Detail - Accrued Expenses and Trade Payables (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Accounts Payable And Accrued Liabilities Current [Abstract]
Accrued payroll and related taxes	$ 11,176	$ 13,338
Accrued state, federal, and local taxes	915	1,044
Accrued referral source commissions	3,779	4,271
Trade payables	8,531	9,822
Earnout liabilities	2,969	3,061
Accrued financing costs	1,377	257
Accrued leasehold improvements	1,201	1,288
Other	6,403	5,083
Total	$ 36,351	$ 38,164

Intangible Assets - Schedule of

Intangible Assets - Schedule of Finite-lived Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Finite Lived Intangible Assets [Line Items]
Gross	$ 47,351	$ 41,056
Accumulated Amortization	(24,792)	(21,982)
Net	22,559	19,074
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Gross	15,475	15,270
Accumulated Amortization	(8,276)	(7,347)
Net	$ 7,199	$ 7,923
Customer Relationships | Minimum
Finite Lived Intangible Assets [Line Items]
Average Useful Life (Years)	3 years	3 years
Customer Relationships | Maximum
Finite Lived Intangible Assets [Line Items]
Average Useful Life (Years)	10 years	10 years
Developed Technology
Finite Lived Intangible Assets [Line Items]
Gross	$ 30,882	$ 24,781
Accumulated Amortization	(15,570)	(13,785)
Net	$ 15,312	$ 10,996
Developed Technology | Minimum
Finite Lived Intangible Assets [Line Items]
Average Useful Life (Years)	3 years	3 years
Developed Technology | Maximum
Finite Lived Intangible Assets [Line Items]
Average Useful Life (Years)	8 years	8 years
Noncompete Agreements
Finite Lived Intangible Assets [Line Items]
Gross	$ 574	$ 586
Accumulated Amortization	(526)	(446)
Net	$ 48	$ 140
Noncompete Agreements | Minimum
Finite Lived Intangible Assets [Line Items]
Average Useful Life (Years)	3 years	3 years
Noncompete Agreements | Maximum
Finite Lived Intangible Assets [Line Items]
Average Useful Life (Years)	5 years	5 years
Tradename and Trademarks
Finite Lived Intangible Assets [Line Items]
Gross	$ 420	$ 419
Accumulated Amortization	$ (420)	(404)
Net		$ 15
Tradename and Trademarks | Minimum
Finite Lived Intangible Assets [Line Items]
Average Useful Life (Years)	1 year	1 year
Tradename and Trademarks | Maximum
Finite Lived Intangible Assets [Line Items]
Average Useful Life (Years)	4 years	4 years

Intangible Assets - Additional

Intangible Assets - Additional Information (Details) - USD ($) $ in Thousands	Nov. 29, 2019	May 29, 2019	Nov. 29, 2018	Jun. 30, 2018	May 31, 2018	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Finite Lived Intangible Assets [Line Items]
Finite-lived intangible assets, amortization expense							$ 1,400	$ 1,400	$ 2,800	$ 2,800
Cash payment to sellers									$ 4,881
Atlantax Systems, Inc
Finite Lived Intangible Assets [Line Items]
Prepayment funded for future earnings					$ 400
Tradestream Technologies Inc. and Wise 24 Inc
Finite Lived Intangible Assets [Line Items]
Future revenue recognized period					6 years
Cash payment to sellers				$ 2,500	$ 1,500	$ 4,000
Common stock Issue					113,122
Legal costs related to transaction					$ 100
Tradestream Technologies Inc. and Wise 24 Inc | Scenario, Forecast
Finite Lived Intangible Assets [Line Items]
Common stock Issue	37,706	37,708	37,708
Tradestream Technologies Inc. and Wise 24 Inc | Maximum
Finite Lived Intangible Assets [Line Items]
Total consideration price					$ 30,000
Customer Relationships | Maximum
Finite Lived Intangible Assets [Line Items]
Intangible asset estimated useful life									10 years		10 years
Customer Relationships | Minimum
Finite Lived Intangible Assets [Line Items]
Intangible asset estimated useful life									3 years		3 years
Customer Relationships | Atlantax Systems, Inc
Finite Lived Intangible Assets [Line Items]
Future revenue recognized period					4 years
Prepayment for acquisition of intangible assets				400		400	400		$ 400
Intangible asset estimated useful life									5 years
Customer Relationships | Atlantax Systems, Inc | Maximum
Finite Lived Intangible Assets [Line Items]
Total consideration price					$ 1,900
Developed Technology | Maximum
Finite Lived Intangible Assets [Line Items]
Intangible asset estimated useful life									8 years		8 years
Developed Technology | Minimum
Finite Lived Intangible Assets [Line Items]
Intangible asset estimated useful life									3 years		3 years
Developed Technology | Tradestream Technologies Inc. and Wise 24 Inc
Finite Lived Intangible Assets [Line Items]
Total consideration price									$ 6,600
Intangible asset estimated useful life									6 years
Total consideration consisting of cash paid									$ 7,100
Current other receivable				$ 500		$ 500	$ 500		$ 500

Intangible Assets - Schedule 37

Intangible Assets - Schedule of Changes in Carrying Amount of Goodwill (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]
Balance—January 1, 2018	$ 72,482
Cumulative translation adjustments	(1,790)
Balance—June 30, 2018	$ 70,692

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Loss Contingencies [Line Items]
Rent expense	$ 2,600,000	$ 1,300,000	$ 4,900,000	$ 2,600,000
Loss contingency, inestimable loss			The Company has not recorded an accrual related to these arrangements as of June 30, 2018 because it has not determined that a loss is probable.
Maximum
Loss Contingencies [Line Items]
Estimated range of loss	$ 2,000,000		$ 2,000,000

Debt - Additional Information (

Debt - Additional Information (Details) - USD ($)	Jun. 20, 2018	Nov. 30, 2017	Jun. 30, 2018	Dec. 31, 2017
Line Of Credit Facility [Line Items]
Repayments of revolving credit facility			$ 33,000,000
Loan and Security Agreement
Line Of Credit Facility [Line Items]
Deferred financing fees, net of amortization			400,000	$ 500,000
Loan and Security Agreement | Silicon Valley Bank
Line Of Credit Facility [Line Items]
Borrowings outstanding		$ 2,500,000	2,500,000
Term Loan | Loan and Security Agreement | Silicon Valley Bank and Ally Bank
Line Of Credit Facility [Line Items]
Credit facilities amount		$ 30,000,000	$ 30,000,000
Credit facilities, repayment month and year		2020-11
Facilities annual interest rate			7.25%
Term Loan | Loan and Security Agreement | Silicon Valley Bank and Ally Bank | Prime Rate | Maximum
Line Of Credit Facility [Line Items]
Credit facilities, variable rate		2.25%
Revolving Credit Facility | Loan and Security Agreement | Silicon Valley Bank and Ally Bank
Line Of Credit Facility [Line Items]
Credit facilities amount		$ 50,000,000
Credit facilities, repayment month and year		2019-11
Quarterly fee on undrawn portion available under credit facilities		0.50%
Repayments of revolving credit facility	$ 33,000,000
Borrowings outstanding			$ 0
Revolving Credit Facility | Loan and Security Agreement | Silicon Valley Bank and Ally Bank | Prime Rate | Maximum
Line Of Credit Facility [Line Items]
Credit facilities, variable rate		1.75%
Revolving Credit Facility | Loan and Security Agreement | Silicon Valley Bank
Line Of Credit Facility [Line Items]
Remained available for borrowing			$ 47,500,000
Credit Facilities | Loan and Security Agreement | Silicon Valley Bank and Ally Bank | Maximum
Line Of Credit Facility [Line Items]
Credit facilities, interest rate		4.25%

Debt - Schedule of Outstanding

Debt - Schedule of Outstanding Borrowings (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current portion:
Credit facilities	$ 4,375	$ 625
Note payable		234
Total current portion of long-term debt	4,375	859
Noncurrent portion:
Credit facilities	25,218	38,840
Total noncurrent portion of long-term debt	$ 25,218	$ 38,840

Convertible Preferred Stock a41

Convertible Preferred Stock and Shareholders' Equity (Deficit) - Additional Information (Details) $ / shares in Units, $ in Millions	Nov. 29, 2019shares	May 29, 2019shares	Nov. 29, 2018shares	Jun. 14, 2018USD ($)$ / sharesshares	May 10, 2018	May 31, 2018shares	Jun. 30, 2018USD ($)Class$ / sharesshares	Jun. 30, 2017USD ($)	Dec. 31, 2017$ / sharesshares
Class Of Stock [Line Items]
Number of classes of stock | Class							2
Capital stock, authorized shares				260,290,986			620,000,000
Common stock, shares authorized				153,944,895			600,000,000		153,945,000
Common stock, par value | $ / shares				$ 0.0001			$ 0.0001		$ 0.0001
Convertible preferred stock, shares authorized				106,346,091
Convertible preferred stock, par value | $ / shares				$ 0.0001
Preferred stock, shares authorized							20,000,000
Preferred stock, par value | $ / shares							$ 0.0001		$ 0.0001
Description of IPO transaction							There were no changes to the rights and preferences of the common stock as a result of the IPO.
Preferred stock converted into common stock				50,888,014
Convertible preferred stock, shares issued							0
Convertible preferred stock, shares outstanding							0
Tradestream Technologies Inc. and Wise 24 Inc
Class Of Stock [Line Items]
Common stock Issue						113,122
Tradestream Technologies Inc. and Wise 24 Inc | Scenario, Forecast
Class Of Stock [Line Items]
Common stock Issue	37,706	37,708	37,708
Common Stock
Class Of Stock [Line Items]
Preferred stock, conversion basis					2-to-1		2-to-1
Number of warrants net exercised to common stock							144,945
Common Stock Warrants
Class Of Stock [Line Items]
Number of warrants exercised				363,000
Proceeds from exercise of warrants | $				$ 3.7
Number of warrants outstanding							0
Common Stock Warrants | Board of Directors
Class Of Stock [Line Items]
Number of common stock warrants issued							80,000		80,000
Common stock warrants, weighted average exercise price, per share | $ / shares							$ 16.60		$ 13.84
Common Stock Warrants | Board of Directors | General and Administrative
Class Of Stock [Line Items]
Warrants grant date fair value | $							$ 0.5	$ 0.5

Convertible Preferred Stock a42

Convertible Preferred Stock and Shareholders' Equity (Deficit) - Summary of Changes of Convertible Preferred Stock and Shareholders' Deficit (Details) - USD ($) $ in Thousands	Jun. 14, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Class Of Stock [Line Items]
Conversion of preferred stock to common stock, Shares	(50,888,014)
Balance at June 30, 2018, Shares		0		0
Balance at January 1, 2018				$ (393,592)
Proceeds from initial public offering, net of underwriters' discounts				192,510
Initial public offering costs				(3,425)
Conversion of preferred stock to common stock				370,854
Shares tendered for cashless redemption				(11,198)
Exercise of stock options				$ 8,777
Exercise of stock options, Shares				1,090,951
Exercise of warrants				$ 5,783
Stock-based compensation expense				7,088
Repurchase of shares				(1,738)
Loss on translation adjustment		$ (3,048)	$ (211)	(2,445)	$ 799
Shares issued to purchase intangible assets				2,555
Net loss		(17,766)	$ (15,449)	(33,015)	$ (31,447)
Balance at June 30, 2018		142,154		142,154
Common Stock
Class Of Stock [Line Items]
Balance at January 1, 2018				$ 1
Balance at January 1, 2018, Shares				5,992,293
Proceeds from initial public offering, net of underwriters' discounts				$ 1
Number of common stock sold				8,625,000
Conversion of preferred stock to common stock				$ 5
Conversion of preferred stock to common stock, Shares				50,888,014
Shares tendered for cashless redemption, Shares				(604,523)
Exercise of stock options, Shares				1,091,713
Exercise of warrants, Shares				570,000
Repurchase of shares				(104,847)
Balance at June 30, 2018		$ 7		$ 7
Balance at June 30, 2018, Shares		66,457,650		66,457,650
Additional Paid-In Capital
Class Of Stock [Line Items]
Balance at January 1, 2018				$ 18,121
Proceeds from initial public offering, net of underwriters' discounts				192,509
Initial public offering costs				(3,425)
Conversion of preferred stock to common stock				370,849
Shares tendered for cashless redemption				(11,198)
Exercise of stock options				8,777
Exercise of warrants				5,783
Stock-based compensation expense				7,088
Repurchase of shares				(1,738)
Shares issued to purchase intangible assets				2,555
Balance at June 30, 2018		$ 589,321		589,321
Accumulated Other Comprehensive Income (Loss)
Class Of Stock [Line Items]
Balance at January 1, 2018				338
Loss on translation adjustment				(2,445)
Balance at June 30, 2018		(2,107)		(2,107)
Accumulated Deficit
Class Of Stock [Line Items]
Balance at January 1, 2018				(412,052)
Net loss				(33,015)
Balance at June 30, 2018		$ (445,067)		(445,067)
Convertible Preferred Stock
Class Of Stock [Line Items]
Balance at January 1, 2018				$ 370,921
Balance at January 1, 2018, Shares				101,786,205
Conversion of preferred stock to common stock				$ (370,854)
Conversion of preferred stock to common stock, Shares				(101,776,205)
Repurchase of shares				$ (67)
Repurchase of shares, Shares				(10,000)

Equity Incentive Plans - Additi

Equity Incentive Plans - Additional Information (Details) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018USD ($)Planshares	Jun. 30, 2017USD ($)	Jun. 30, 2018USD ($)Plan$ / sharesshares	Jun. 30, 2017USD ($)$ / sharesshares	Jun. 14, 2018shares	Dec. 31, 2017Planshares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of stock based compensation plans | Plan	2		2			2
Shares subject to outstanding awards	11,313,719		11,313,719			10,727,125
Total intrinsic value of options exercised | $			$ 9.9	$ 2
Weighted average grant date fair value of options granted | $ / shares			$ 8.09	$ 6.40
Number of shares, vested			474,217	661,374
Number of options unvested	5,090,206		5,090,206
Contractual life			10 years
Stock options, average vesting term			4 years
Expected term			6 years	6 years
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense | $	$ 3.6	$ 2.7	$ 6.6	$ 5.3
Total unrecognized compensation expense related to stock options | $	$ 32.6		$ 32.6
Stock options expected to be recognized over period	3 years
Stock options vesting period			4 years
2018 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares of common stock reserved for issuance	5,315,780		5,315,780
Automatically increase percentage of aggregate number of shares of common stock outstanding			5.00%
Shares subject to outstanding awards	0		0
Shares available for future issuance	5,335,049		5,335,049
2006 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares subject to outstanding awards	11,288,595		11,288,595			10,701,710
Shares available for future issuance					0	2,857,533
Taxcient Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares subject to outstanding awards	25,124		25,124			25,124
2018 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares of common stock reserved for issuance	996,709		996,709
Contractual life			10 years
Initial offering period			June 15, 2018
Description of offering period for ESPP			The first offering period began on June 14, 2018 and will end on January 31, 2019. Thereafter, offering periods will begin on August 1 and February 1 (or such other date determined by our Board of Directors or our Compensation and Leadership Development Committee).
Minimum weekly hours required to work for getting eligible to participate in ESPP			20 hours
Description of purchase price for shares of common stock purchased under ESPP			The purchase price for shares of common stock purchased under the ESPP is 85% of the lesser of the fair market value of the Company’s common stock on (i) the first day of the applicable offering period or (ii) the last day of the purchase period in the applicable offering period.
Percentage of purchase price for shares of common stock under fair value market			85.00%
Employee stock purchase plan number of shares initially authorized			10,102,525
2018 Employee Stock Purchase Plan | Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Automatically increase percentage of aggregate number of shares of common stock outstanding			1.00%
Percentage of payroll deduction on eligible compensation			1.00%
Increase of common stock capital shares reserved for future issuance in each of calendar year			1,000,000
2018 Employee Stock Purchase Plan | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of payroll deduction on eligible compensation			15.00%

Equity Incentive Plans - Summar

Equity Incentive Plans - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Shares
Options outstanding as of January 1, 2018	10,727,125
Options granted	2,371,093
Options exercised	(1,090,951)
Options cancelled	(562,345)
Options expired	(131,203)
Options outstanding as of June 30, 2018	11,313,719	10,727,125
Options exercisable as of June 30, 2018	6,223,513
Weighted Average Exercise Price
Options outstanding as of January 1, 2018	$ 9.94
Options granted	17.83
Options exercised	8.04
Options cancelled	14.01
Options expired	11.07
Options outstanding as of June 30, 2018	11.56	$ 9.94
Options exercisable as of June 30, 2018	$ 8.25
Weighted Average Remaining Contractual Life (Years)
Options outstanding	7 years 2 months 23 days	7 years
Options exercisable as of June 30, 2018	5 years 9 months 21 days
Aggregate Intrinsic Value
Options outstanding as of January 1, 2018	$ 473,001	$ 71,430
Options exercisable as of June 30, 2018	$ 280,791

Equity Incentive Plans - Summ45

Equity Incentive Plans - Summary of Options Outstanding and Vested (Details)	6 Months Ended
	Jun. 30, 2018$ / sharesshares
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Option Outstanding, Number Outstanding	11,313,719
Options Vested and Exercisable, Number Vested and Exercisable	6,223,513
Options Vested and Exercisable, Weighted Average Life (in Years)	5 years 9 months 21 days
$0.70 to 1.90
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise Prices, Low | $ / shares	$ 0.70
Exercise Prices, High | $ / shares	$ 1.90
Option Outstanding, Number Outstanding	1,113,182
Options Outstanding, Weighted Average Life (in Years)	2 years 7 months 20 days
Options Vested and Exercisable, Number Vested and Exercisable	1,113,182
Options Vested and Exercisable, Weighted Average Life (in Years)	2 years 7 months 20 days
2.86 to 6.40
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise Prices, Low | $ / shares	$ 2.86
Exercise Prices, High | $ / shares	$ 6.40
Option Outstanding, Number Outstanding	1,212,440
Options Outstanding, Weighted Average Life (in Years)	4 years 9 months 3 days
Options Vested and Exercisable, Number Vested and Exercisable	1,212,440
Options Vested and Exercisable, Weighted Average Life (in Years)	4 years 9 months 3 days
8.04 to 11.72
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise Prices, Low | $ / shares	$ 8.04
Exercise Prices, High | $ / shares	$ 11.72
Option Outstanding, Number Outstanding	1,534,228
Options Outstanding, Weighted Average Life (in Years)	5 years 8 months 19 days
Options Vested and Exercisable, Number Vested and Exercisable	1,495,460
Options Vested and Exercisable, Weighted Average Life (in Years)	5 years 8 months 19 days
12.20 to 15.06
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise Prices, Low | $ / shares	$ 12.20
Exercise Prices, High | $ / shares	$ 15.06
Option Outstanding, Number Outstanding	4,839,058
Options Outstanding, Weighted Average Life (in Years)	8 years 29 days
Options Vested and Exercisable, Number Vested and Exercisable	2,389,843
Options Vested and Exercisable, Weighted Average Life (in Years)	7 years 10 months 2 days
16.06 to 24.00
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Exercise Prices, Low | $ / shares	$ 16.06
Exercise Prices, High | $ / shares	$ 24
Option Outstanding, Number Outstanding	2,614,811
Options Outstanding, Weighted Average Life (in Years)	9 years 7 months 17 days
Options Vested and Exercisable, Number Vested and Exercisable	12,588
Options Vested and Exercisable, Weighted Average Life (in Years)	9 years 10 months 13 days

Equity Incentive Plans - Summ46

Equity Incentive Plans - Summary of Fair Value Options Estimated Using Black-Scholes Option Pricing Model Assumptions (Details) - $ / shares	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Volatility, minimum		40.00%
Volatility, maximum		43.00%
Volatility	40.00%
Expected term	6 years	6 years
Risk-free interest rate, minimum	2.55%	2.02%
Risk-free interest rate, maximum	2.97%	2.20%
Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair value of common stock	$ 16.86	$ 13.84
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair value of common stock	$ 24	$ 14.68

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Percentage of effective income tax rate benefit	2.20%	0.90%
Deferred income tax benefit associated with goodwill	$ (0.9)

Net Loss Per Share Attributab48

Net Loss Per Share Attributable to Common Shareholders - Schedule of Computation of Basic and Diluted Net Loss Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Numerator:
Net loss attributable to common shareholders	$ (17,766)	$ (15,449)	$ (33,015)	$ (31,447)
Denominator:
Weighted-average common shares outstanding-basic	14,383	5,494	10,299	5,442
Weighted-average common shares outstanding-diluted	14,383	5,494	10,299	5,442
Net loss per common share, basic and diluted	$ (1.24)	$ (2.81)	$ (3.21)	$ (5.78)

Net Loss Per Share Attributab49

Net Loss Per Share Attributable to Common Shareholders - Schedule of Weighted-Average Outstanding Shares of Common Stock Equivalents Were Excluded from Computation of Diluted Net Loss Per Share (Detail) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share amount	55,730	62,170	59,208	61,753
Convertible Preferred Shares
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share amount	44,178	50,893	47,515	50,893
Options To Purchase Common Stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share amount	11,151	10,616	11,218	10,189
Common Stock Warrants | Common Stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share amount	401	661	475	671