ChannelAdvisor (ECOM) 10-Q 2 Nov 17 2017 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2017	Oct. 19, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q3
Entity Registrant Name	CHANNELADVISOR CORP
Entity Central Index Key	1,169,652
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		26,569,655

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 54,178	$ 65,420
Accounts receivable, net of allowance of $304 and $594 as of September 30, 2017 and December 31, 2016, respectively	21,276	19,445
Prepaid expenses and other current assets	12,249	10,972
Total current assets	87,703	95,837
Property and equipment, net	11,797	13,252
Goodwill	23,486	21,632
Intangible assets, net	2,658	2,660
Long-term deferred tax assets, net	5,580	5,244
Other assets	813	533
Total assets	132,037	139,158
Current liabilities:
Accounts payable	3,533	4,709
Accrued expenses	10,656	11,067
Deferred revenue	26,316	23,474
Other current liabilities	4,807	4,450
Total current liabilities	45,312	43,700
Long-term capital leases, net of current portion	898	1,262
Lease incentive obligation	3,547	4,206
Other long-term liabilities	3,484	2,993
Total liabilities	53,241	52,161
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $0.001 par value, 5,000,000 shares authorized, no shares issued and outstanding as of September 30, 2017 and December 31, 2016	0	0
Common stock, $0.001 par value, 100,000,000 shares authorized, 26,481,401 and 25,955,759 shares issued and outstanding as of September 30, 2017 and December 31, 2016, respectively	26	26
Additional paid-in capital	259,334	252,158
Accumulated other comprehensive loss	(893)	(1,612)
Accumulated deficit	(179,671)	(163,575)
Total stockholders’ equity	78,796	86,997
Total liabilities and stockholders’ equity	$ 132,037	$ 139,158

CONDENSED CONSOLIDATED BALANCE3

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Allowance for doubtful accounts receivable, current	$ 304	$ 594
Stockholders' equity:
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	26,481,401	25,955,759
Common stock, shares outstanding (in shares)	26,481,401	25,955,759

UNAUDITED CONDENSED CONSOLIDATE

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Revenue	$ 30,097	$ 27,992	$ 88,430	$ 81,437
Cost of revenue	6,549	6,811	19,911	20,587
Gross profit	23,548	21,181	68,519	60,850
Operating expenses:
Sales and marketing	15,565	13,824	47,231	43,064
Research and development	5,760	4,512	15,878	13,077
General and administrative	6,344	5,525	21,552	18,768
Total operating expenses	27,669	23,861	84,661	74,909
Loss from operations	(4,121)	(2,680)	(16,142)	(14,059)
Other income (expense):
Interest income (expense), net	67	11	149	(11)
Other income (expense), net	36	90	106	137
Total other income (expense)	103	101	255	126
Loss before income taxes	(4,018)	(2,579)	(15,887)	(13,933)
Income tax expense (benefit)	37	(27)	209	(91)
Net loss	$ (4,055)	$ (2,552)	$ (16,096)	$ (13,842)
Net loss per share:
Basic and diluted (in dollars per share)	$ (0.15)	$ (0.10)	$ (0.61)	$ (0.54)
Weighted average common shares outstanding:
Basic and diluted (in shares)	26,439,830	25,723,749	26,293,650	25,513,105

UNAUDITED CONDENSED CONSOLIDAT5

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net loss	$ (4,055)	$ (2,552)	$ (16,096)	$ (13,842)
Other comprehensive gain (loss):
Foreign currency translation adjustments	184	(78)	719	(180)
Total comprehensive loss	$ (3,871)	$ (2,630)	$ (15,377)	$ (14,022)

UNAUDITED CONDENSED CONSOLIDAT6

UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities
Net loss	$ (16,096)	$ (13,842)
Adjustments to reconcile net loss to cash and cash equivalents (used in) provided by operating activities:
Depreciation and amortization	5,041	5,961
Bad debt expense	271	246
Stock-based compensation expense	9,132	10,207
Other items, net	(499)	(769)
Changes in assets and liabilities, net of effects from acquisition:
Accounts receivable	(1,674)	2,820
Prepaid expenses and other assets	(1,370)	1,832
Accounts payable and accrued expenses	(51)	(1,251)
Deferred revenue	3,042	4,162
Cash and cash equivalents (used in) provided by operating activities	(2,204)	9,366
Cash flows from investing activities
Purchases of property and equipment	(2,427)	(920)
Payment of internal-use software development costs	(224)	(195)
Acquisition, net of cash acquired	(2,177)	0
Cash and cash equivalents used in investing activities	(4,828)	(1,115)
Cash flows from financing activities
Repayment of capital leases	(2,586)	(2,079)
Proceeds from exercise of stock options	625	821
Payment of contingent consideration	0	(338)
Payment of statutory tax withholding related to net-share settlement of restricted stock units	(2,581)	(2,085)
Cash and cash equivalents used in financing activities	(4,542)	(3,681)
Effect of currency exchange rate changes on cash and cash equivalents	332	(313)
Net (decrease) increase in cash and cash equivalents	(11,242)	4,257
Cash and cash equivalents, beginning of period	65,420	60,474
Cash and cash equivalents, end of period	54,178	64,731
Supplemental disclosure of cash flow information
Cash paid for interest	99	126
Cash paid for income taxes, net	151	110
Supplemental disclosure of noncash investing and financing activities
Accrued capital expenditures	54	439
Capital lease obligations entered into for the purchase of fixed assets	$ 567	$ 1,771

Description of the Business

Description of the Business	9 Months Ended
	Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
DESCRIPTION OF THE BUSINESS	DESCRIPTION OF THE BUSINESS ChannelAdvisor Corporation ("ChannelAdvisor" or the "Company") was incorporated in the state of Delaware and capitalized in June 2001. The Company began operations in July 2001. ChannelAdvisor is a provider of software-as-a-service, or SaaS, solutions and our mission is to connect and optimize the world's commerce. ChannelAdvisor's e-commerce cloud platform helps retailers and branded manufacturers worldwide improve their online performance by expanding sales channels, connecting with consumers around the world, optimizing their operations for peak performance and providing actionable analytics to improve competitiveness. The Company is headquartered in Morrisville, North Carolina and has international offices in England, Ireland, Germany, Australia, Brazil, China and Spain.

Significant Accounting Policies

Significant Accounting Policies	9 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
SIGNIFICANT ACCOUNTING POLICIES	SIGNIFICANT ACCOUNTING POLICIES Principles of Consolidation The accompanying condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation. Interim Condensed Consolidated Financial Information The accompanying condensed consolidated financial statements and footnotes have been prepared in accordance with generally accepted accounting principles in the United States of America ("U.S. GAAP") as contained in the Financial Accounting Standards Board ("FASB") Accounting Standards Codification ("ASC") for interim financial information. In the opinion of management, the interim financial information includes all adjustments of a normal recurring nature necessary for a fair presentation of financial position, the results of operations, comprehensive loss and cash flows. The results of operations for the three and nine months ended September 30, 2017 are not necessarily indicative of the results for the full year or the results for any future periods. These unaudited interim financial statements should be read in conjunction with the audited financial statements and related footnotes for the year ended December 31, 2016 ("fiscal 2016"), which are included in the Company’s Annual Report on Form 10-K for fiscal 2016. There have been no material changes to the Company’s significant accounting policies from those described in the footnotes to the audited financial statements contained in the Company’s Annual Report on Form 10-K for fiscal 2016. Recent Accounting Pronouncements Standard Description Effect on the Financial Statements or Other Significant Matters Standards that the Company has not yet adopted Revenue Recognition: Accounting Standards Update ("ASU") 2014-09, Revenue from Contracts with Customers (Topic 606) The Company's adoption date: January 1, 2018 The standard will replace existing revenue recognition standards and provides that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2014-09 also requires improved disclosures to help users of financial statements better understand the nature, amount, timing, and uncertainty of revenue that is recognized. Entities have the option of using either a full retrospective or modified retrospective approach for the adoption of the standard. The Company formed a project team to evaluate and direct the implementation of the new revenue recognition standard and related amendments. The project team developed an implementation plan centered around specific functional areas that may be impacted by the standard and its amendments, including accounting and reporting, information technology ("IT"), internal audit and contracts and legal, among others. This team has recently completed certain IT updates to the Company's accounting system to support recognition and disclosure under the new standard, and is continuing to make additional updates to facilitate the standard's adoption and reporting requirements. The project team completed an initial contract assessment on a sample of contracts and analyzed the Company's contract portfolio and associated contract costs. The team is finalizing the Company's remaining accounting positions under ASU 2014-09, as amended, including certain significant judgments and estimates required, and is currently assessing the potential changes to internal controls and the tax effect implications. The project team has reported the findings and progress of the implementation plan to management and to the Audit Committee on a frequent basis over the last two years and will continue to do so as the effective date of the new standard approaches. The Company anticipates that the adoption of the new standard will impact the timing of revenue recognition of fixed fees for its contracts, as well as the accounting for costs to obtain contracts. For managed-service contracts, the Company currently defers revenue until the completion of the implementation services, at which point the Company recognizes a cumulative catch-up adjustment equal to the revenue earned during the implementation period but previously deferred. The remaining balance of these fixed fees is recognized ratably over the remaining term of the contract. Under the new standard, the Company expects revenue recognition for the managed-service subscription and implementation fees to begin on the launch date and to be recognized over time through the contract end date, with no cumulative catch-up adjustment on the launch date. Further, the Company currently expenses sales commissions and related bonuses as incurred. Under the new standard, the Company will be required to defer and amortize a portion of these contract costs. The Company intends to adopt the new standard using the modified retrospective transition method effective January 1, 2018. The Company continues to evaluate the provisions of the new standard to identify further potential impacts to its consolidated financial statements. ASU 2016-08, Principal Versus Agent Considerations (Reporting Revenue Gross Versus Net) The Company's adoption date: January 1, 2018 The standard clarifies implementation guidance on principal versus agent considerations in ASU 2014-09. ASU 2016-10, Identifying Performance Obligations and Licensing The Company's adoption date: January 1, 2018 The standard clarifies implementation guidance on the identification of performance obligations and the licensing implementation guidance in ASU 2014-09. ASU 2016-12, Narrow-Scope Improvements and Practical Expedients The Company's adoption date: January 1, 2018 The standard clarifies the guidance on assessing collectability, presentation of sales taxes, noncash consideration and completed contracts and contract modifications at transition. ASU 2016-20, Technical Corrections and Improvements to Topic 606 The Company's adoption date: January 1, 2018 The standard clarifies certain narrow aspects of ASU 2014-09. Leases: ASU 2016-02, Leases (Topic 842) The Company's adoption date: January 1, 2019 The standard requires that lessees recognize assets and liabilities for leases with lease terms greater than twelve months in the statement of financial position. The standard also requires improved disclosures to help users of financial statements better understand the amount, timing and uncertainty of cash flows arising from leases. The Company is currently evaluating the impact the adoption of the standard will have on its consolidated financial statements. Financial Instruments: ASU 2016-13, Financial Instruments - Credit Losses (Topic 326) The Company's adoption date: January 1, 2020 The standard replaces the incurred loss impairment methodology in current U.S. GAAP (defined below) with a methodology that reflects expected credit losses. The update is intended to provide financial statement users with more useful information about expected credit losses. The Company is currently evaluating the impact the adoption of the standard will have on its consolidated financial statements. Cash Flow: ASU 2016-18, Restricted Cash The Company's adoption date: January 1, 2018 The standard requires that entities show the changes in the total of cash, cash equivalents and restricted cash in the statement of cash flows. Transfers between cash, cash equivalents and restricted cash should not be presented as cash flow activities on the statement of cash flows. The Company is currently evaluating the impact the adoption of the standard will have on its consolidated financial statements. Standards that the Company has recently adopted Stock-Based Compensation: ASU 2016-09, Improvements to Employee Share-Based Payment Accounting (Topic 718) The Company's adoption date: January 1, 2017 The standard is intended to simplify several aspects of the accounting for share-based payment transactions, including the accounting for income taxes, forfeitures, and statutory tax withholding requirements, as well as classification in the statement of cash flows. The Company adopted this standard effective January 1, 2017. As a result of this adoption, the Company recognized $8.2 million of deferred tax assets attributable to accumulated excess tax benefits that under the previous guidance could not be recognized until the benefits were realized through a reduction in income taxes payable. This adjustment was applied using a modified retrospective method with a cumulative-effect adjustment to the accumulated deficit for the excess tax benefits not previously recognized. However, given the full valuation allowance of $8.2 million placed on the additional deferred tax assets, the recognition upon adoption had no impact on the Company's accumulated deficit as of January 1, 2017. Further, the Company has elected to continue to estimate forfeitures to determine the amount of compensation cost to be recognized in each period. Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying notes. Actual results could differ from those estimates. On an ongoing basis, the Company evaluates its estimates, including those related to the accounts receivable allowance, the useful lives of long-lived assets and other intangible assets, income taxes and assumptions used for purposes of determining stock-based compensation, among others. Estimates and assumptions are also required to value assets acquired and liabilities assumed as well as contingent consideration, where applicable, in conjunction with business combinations. The Company bases its estimates on historical experience and on various other assumptions that it believes to be reasonable, the results of which form the basis for making judgments about the carrying value of assets and liabilities.

Stockholders' Equity

Stockholders' Equity	9 Months Ended
	Sep. 30, 2017
Stockholders' Equity Attributable to Parent [Abstract]
STOCKHOLDERS' EQUITY	STOCKHOLDERS' EQUITY The following table summarizes the stockholders' equity activity for the nine months ended September 30, 2017 (in thousands): Balance as of December 31, 2016 $ 86,997 Exercise of stock options and vesting of restricted stock units 625 Stock-based compensation expense 9,132 Statutory tax withholding related to net-share settlement of restricted stock units (2,581 ) Net loss (16,096 ) Foreign currency translation adjustments 719 Balance as of September 30, 2017 $ 78,796

Business Combinations, Goodwill

Business Combinations, Goodwill and Intangible Assets Business Combinations, Goodwill and Intangible Assets	9 Months Ended
	Sep. 30, 2017
Business Combinations [Abstract]
BUSINESS COMBINATIONS, GOODWILL AND INTANGIBLE ASSETS	BUSINESS COMBINATIONS, GOODWILL AND INTANGIBLE ASSETS Business Combinations On May 26, 2017, the Company entered into an Agreement and Plan of Merger (the “Merger Agreement”) pursuant to which the Company acquired all of the issued and outstanding shares of HubLogix Commerce Corp. ("HubLogix") (now ChannelAdvisor Fulfillment, Inc.), a fulfillment and logistics platform that automates order management by connecting online storefronts and marketplaces to distribution and fulfillment centers. The Company acquired HubLogix to further enhance its fulfillment network offering and capabilities. Under the Merger Agreement, the Company paid an aggregate purchase price of $2.3 million for HubLogix, all of which was paid in cash, which amount is subject to adjustment as set forth in the Merger Agreement. The purchase price includes $0.4 million that has been placed into escrow to secure the indemnification obligations of HubLogix stockholders until November 26, 2018. The acquisition has been accounted for under the acquisition method of accounting in accordance with Accounting Standards Codification Topic 805, Business Combinations ("ASC 805"). Under the acquisition method of accounting, the Company allocated the purchase price to the identifiable assets acquired and liabilities assumed based on their estimated acquisition-date fair value. The difference between the acquisition-date fair value of the consideration and the estimated fair value of the net assets acquired is recorded as goodwill. Goodwill represents the future economic benefits expected to arise from other intangible assets acquired that do not qualify for separate recognition, including acquired workforce, as well as expected future synergies. Based on management’s provisional assessment of the acquisition-date fair value of the assets acquired and liabilities assumed, the purchase price of $2.3 million has been allocated to the Company’s assets and liabilities on a preliminary basis as follows: $1.9 million to goodwill, $0.5 million to identifiable intangible assets and $0.1 million to working capital as a net current liability. The purchase price allocation in conjunction with the acquisition of HubLogix is subject to change as additional information becomes available. Any adjustments will be made as soon as practicable, but not later than one year from the acquisition date. The goodwill of $1.9 million arising from the acquisition of HubLogix consists largely of the acquired workforce, the expected company-specific synergies and the opportunity to expand the Company’s product offerings to customers. The goodwill recognized is not deductible for income tax purposes. The Company incurred transaction costs in connection with the acquisition of $0.3 million , which are included in general and administrative expense in the accompanying condensed consolidated statements of operations for the nine months ended September 30, 2017 . Comparative pro forma financial information for this acquisition has not been presented because the acquisition is not material to the Company’s consolidated results of operations. Goodwill and Intangible Assets The following table shows the changes in the carrying amount of goodwill for the nine months ended September 30, 2017 (in thousands): Balance as of December 31, 2016 $ 21,632 Goodwill attributable to the HubLogix acquisition 1,854 Balance as of September 30, 2017 $ 23,486 There were no changes to the Company's goodwill during the year ended December 31, 2016. The Company acquired intangible assets in connection with its business acquisitions. These assets were recorded at their estimated fair values at the acquisition date and are being amortized over their respective estimated useful lives using the straight-line method. The estimated useful lives and amortization methodology used in computing amortization are as follows: Estimated Useful Life Amortization Methodology Customer relationships 7 years Straight-line Acquired technology 7 years Straight-line Trade names 3 years Straight-line Amortization expense associated with the Company's intangible assets was $0.2 million and $0.1 million for the three months ended September 30, 2017 and 2016, respectively, and was $0.5 million and $0.4 million for the nine months ended September 30, 2017 and 2016, respectively.

Commitments

Commitments	9 Months Ended
	Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS	COMMITMENTS Sales Tax During the first quarter of 2017, the Company completed its analysis with regard to potential unpaid sales tax obligations. Based on the results of this analysis, the Company made the decision to enter into voluntary disclosure agreements ("VDAs") with certain jurisdictions to reduce the Company’s potential sales tax liability. VDAs generally provide for a maximum look-back period, a waiver of penalties and, at times, interest as well as payment arrangements. The Company's estimated aggregate VDA liability of $2.5 million was recorded as a one-time charge in general and administrative expense in the accompanying condensed consolidated statements of operations for the nine months ended September 30, 2017 . This amount represents the Company's estimate of its potential unpaid sales tax liability through the anticipated look-back periods including interest, where applicable, in all jurisdictions in which the Company has entered into or intends to enter into VDAs. If any of the tax authorities rejects the Company's VDA applications or offers terms that are other than what the Company is anticipating, or if the VDAs do not resolve all potential unpaid sales tax obligations, then it is possible that the actual aggregate unpaid sales tax liability may be higher or lower than the Company's estimate. Through September 30, 2017, the Company has paid approximately $0.9 million under terms of the VDA agreements that it has completed with certain jurisdictions. During the third quarter of 2017, a jurisdiction rejected the Company's VDA application and will be conducting a sales tax audit. The Company believes the scope of the audit will be limited and similar in principle to the VDA program offered by that jurisdiction; as a result, the Company has determined not to revise its estimate of its potential unpaid sales tax liability. The completion date of the sales tax audit has not been determined. The Company expects to complete the remaining VDAs within the next six months following the date of filing this Quarterly Report on Form 10-Q.

Stock-Based Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
STOCK-BASED COMPENSATION	STOCK-BASED COMPENSATION The Company recognizes stock-based compensation expense using the accelerated attribution method, net of estimated forfeitures, in which compensation cost for each vesting tranche in an award is recognized ratably from the service inception date to the vesting date for that tranche. Stock-based compensation expense is included in the following line items in the accompanying condensed consolidated statements of operations for the three and nine months ended September 30, 2017 and 2016 (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 Cost of revenue $ 259 $ 330 $ 753 $ 941 Sales and marketing 970 1,161 2,960 3,651 Research and development 588 496 1,659 1,485 General and administrative 1,023 878 3,760 4,130 $ 2,840 $ 2,865 $ 9,132 $ 10,207 During the nine months ended September 30, 2017 , the Company granted the following share-based awards: Number of Shares Underlying Grant Weighted Average Grant Date Fair Value Stock options 597,034 $ 4.21 Restricted stock units ("RSUs") 1,325,172 10.44 Total share-based awards 1,922,206 8.50

Net Loss Per Share

Net Loss Per Share	9 Months Ended
	Sep. 30, 2017
Earnings Per Share [Abstract]
NET LOSS PER SHARE	NET LOSS PER SHARE Diluted net loss per share is the same as basic net loss per share for all periods presented because the effects of potentially dilutive items were anti-dilutive given the Company’s net loss. The following securities have been excluded from the calculation of weighted average common shares outstanding because the effect is anti-dilutive for the three and nine months ended September 30, 2017 and 2016 : Three and Nine Months Ended September 30, 2017 2016 Stock options 2,132,715 1,657,549 RSUs 2,547,941 2,342,444

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2017
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES At the end of each interim reporting period, the Company estimates its effective income tax rate expected to be applicable for the full year. This estimate is used to determine the income tax provision or benefit on a year-to-date basis and may change in subsequent interim periods. The Company’s effective tax rate was (0.9)% and 1.0% for the three months ended September 30, 2017 and 2016 , respectively, and (1.3)% and 0.7% for the nine months ended September 30, 2017 and 2016 , respectively. The tax (expense) benefit for each of the periods was based on state, local and foreign taxes. The Company’s effective tax rate for these periods is lower than the U.S. federal statutory rate of 34% primarily due to operating losses which are subject to a valuation allowance. The Company cannot recognize the tax benefit of operating loss carryforwards generated in certain jurisdictions due to uncertainties relating to future taxable income in those jurisdictions in terms of both its timing and its sufficiency, which would enable the Company to realize the benefits of those carryforwards. The Company began recognizing tax expense during the 2017 interim periods compared to having recognized tax benefits during the 2016 interim periods. This was in part a result of releasing valuation allowances in certain foreign jurisdictions during the fourth quarter of 2016. In addition, during the interim periods in 2017, the Company no longer had sufficient deferred tax liabilities in one of its foreign subsidiaries necessary to realize the tax benefit of all of its deferred tax assets for that same foreign subsidiary. The Company recorded a valuation allowance against the deferred tax assets of that foreign subsidiary, net of deferred tax liabilities. As a result, the Company is not currently permitted to recognize the tax benefit of that subsidiary’s losses.

Segment and Geographic Informat

Segment and Geographic Information	9 Months Ended
	Sep. 30, 2017
Segment Reporting [Abstract]
SEGMENT AND GEOGRAPHIC INFORMATION	SEGMENT AND GEOGRAPHIC INFORMATION Operating segments are defined as components of an enterprise for which discrete financial information is available that is evaluated regularly by the chief operating decision maker (“CODM”) for purposes of allocating resources and evaluating financial performance. The Company’s CODM reviews financial information presented on a consolidated basis for purposes of allocating resources and evaluating financial performance. As such, the Company’s operations constitute a single operating segment and one reportable segment. Substantially all assets were held in the United States during the nine months ended September 30, 2017 and the year ended December 31, 2016. The table below summarizes revenue by geography for the three and nine months ended September 30, 2017 and 2016 (in thousands). The Company categorizes domestic and international revenue from customers based on their billing address. Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 Domestic $ 23,156 $ 21,985 $ 69,354 $ 63,458 International 6,941 6,007 19,076 17,979 Total revenue $ 30,097 $ 27,992 $ 88,430 $ 81,437

Significant Accounting Polici16

Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Principles of Consolidation	The accompanying condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation.
Interim Condensed Consolidated Financial Information	The accompanying condensed consolidated financial statements and footnotes have been prepared in accordance with generally accepted accounting principles in the United States of America ("U.S. GAAP") as contained in the Financial Accounting Standards Board ("FASB") Accounting Standards Codification ("ASC") for interim financial information. In the opinion of management, the interim financial information includes all adjustments of a normal recurring nature necessary for a fair presentation of financial position, the results of operations, comprehensive loss and cash flows. The results of operations for the three and nine months ended September 30, 2017 are not necessarily indicative of the results for the full year or the results for any future periods. These unaudited interim financial statements should be read in conjunction with the audited financial statements and related footnotes for the year ended December 31, 2016 ("fiscal 2016"), which are included in the Company’s Annual Report on Form 10-K for fiscal 2016. There have been no material changes to the Company’s significant accounting policies from those described in the footnotes to the audited financial statements contained in the Company’s Annual Report on Form 10-K for fiscal 2016.
Recent Accounting Pronouncements	Standard Description Effect on the Financial Statements or Other Significant Matters Standards that the Company has not yet adopted Revenue Recognition: Accounting Standards Update ("ASU") 2014-09, Revenue from Contracts with Customers (Topic 606) The Company's adoption date: January 1, 2018 The standard will replace existing revenue recognition standards and provides that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2014-09 also requires improved disclosures to help users of financial statements better understand the nature, amount, timing, and uncertainty of revenue that is recognized. Entities have the option of using either a full retrospective or modified retrospective approach for the adoption of the standard. The Company formed a project team to evaluate and direct the implementation of the new revenue recognition standard and related amendments. The project team developed an implementation plan centered around specific functional areas that may be impacted by the standard and its amendments, including accounting and reporting, information technology ("IT"), internal audit and contracts and legal, among others. This team has recently completed certain IT updates to the Company's accounting system to support recognition and disclosure under the new standard, and is continuing to make additional updates to facilitate the standard's adoption and reporting requirements. The project team completed an initial contract assessment on a sample of contracts and analyzed the Company's contract portfolio and associated contract costs. The team is finalizing the Company's remaining accounting positions under ASU 2014-09, as amended, including certain significant judgments and estimates required, and is currently assessing the potential changes to internal controls and the tax effect implications. The project team has reported the findings and progress of the implementation plan to management and to the Audit Committee on a frequent basis over the last two years and will continue to do so as the effective date of the new standard approaches. The Company anticipates that the adoption of the new standard will impact the timing of revenue recognition of fixed fees for its contracts, as well as the accounting for costs to obtain contracts. For managed-service contracts, the Company currently defers revenue until the completion of the implementation services, at which point the Company recognizes a cumulative catch-up adjustment equal to the revenue earned during the implementation period but previously deferred. The remaining balance of these fixed fees is recognized ratably over the remaining term of the contract. Under the new standard, the Company expects revenue recognition for the managed-service subscription and implementation fees to begin on the launch date and to be recognized over time through the contract end date, with no cumulative catch-up adjustment on the launch date. Further, the Company currently expenses sales commissions and related bonuses as incurred. Under the new standard, the Company will be required to defer and amortize a portion of these contract costs. The Company intends to adopt the new standard using the modified retrospective transition method effective January 1, 2018. The Company continues to evaluate the provisions of the new standard to identify further potential impacts to its consolidated financial statements. ASU 2016-08, Principal Versus Agent Considerations (Reporting Revenue Gross Versus Net) The Company's adoption date: January 1, 2018 The standard clarifies implementation guidance on principal versus agent considerations in ASU 2014-09. ASU 2016-10, Identifying Performance Obligations and Licensing The Company's adoption date: January 1, 2018 The standard clarifies implementation guidance on the identification of performance obligations and the licensing implementation guidance in ASU 2014-09. ASU 2016-12, Narrow-Scope Improvements and Practical Expedients The Company's adoption date: January 1, 2018 The standard clarifies the guidance on assessing collectability, presentation of sales taxes, noncash consideration and completed contracts and contract modifications at transition. ASU 2016-20, Technical Corrections and Improvements to Topic 606 The Company's adoption date: January 1, 2018 The standard clarifies certain narrow aspects of ASU 2014-09. Leases: ASU 2016-02, Leases (Topic 842) The Company's adoption date: January 1, 2019 The standard requires that lessees recognize assets and liabilities for leases with lease terms greater than twelve months in the statement of financial position. The standard also requires improved disclosures to help users of financial statements better understand the amount, timing and uncertainty of cash flows arising from leases. The Company is currently evaluating the impact the adoption of the standard will have on its consolidated financial statements. Financial Instruments: ASU 2016-13, Financial Instruments - Credit Losses (Topic 326) The Company's adoption date: January 1, 2020 The standard replaces the incurred loss impairment methodology in current U.S. GAAP (defined below) with a methodology that reflects expected credit losses. The update is intended to provide financial statement users with more useful information about expected credit losses. The Company is currently evaluating the impact the adoption of the standard will have on its consolidated financial statements. Cash Flow: ASU 2016-18, Restricted Cash The Company's adoption date: January 1, 2018 The standard requires that entities show the changes in the total of cash, cash equivalents and restricted cash in the statement of cash flows. Transfers between cash, cash equivalents and restricted cash should not be presented as cash flow activities on the statement of cash flows. The Company is currently evaluating the impact the adoption of the standard will have on its consolidated financial statements. Standards that the Company has recently adopted Stock-Based Compensation: ASU 2016-09, Improvements to Employee Share-Based Payment Accounting (Topic 718) The Company's adoption date: January 1, 2017 The standard is intended to simplify several aspects of the accounting for share-based payment transactions, including the accounting for income taxes, forfeitures, and statutory tax withholding requirements, as well as classification in the statement of cash flows. The Company adopted this standard effective January 1, 2017. As a result of this adoption, the Company recognized $8.2 million of deferred tax assets attributable to accumulated excess tax benefits that under the previous guidance could not be recognized until the benefits were realized through a reduction in income taxes payable. This adjustment was applied using a modified retrospective method with a cumulative-effect adjustment to the accumulated deficit for the excess tax benefits not previously recognized. However, given the full valuation allowance of $8.2 million placed on the additional deferred tax assets, the recognition upon adoption had no impact on the Company's accumulated deficit as of January 1, 2017. Further, the Company has elected to continue to estimate forfeitures to determine the amount of compensation cost to be recognized in each period.
Use of Estimates	The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying notes. Actual results could differ from those estimates. On an ongoing basis, the Company evaluates its estimates, including those related to the accounts receivable allowance, the useful lives of long-lived assets and other intangible assets, income taxes and assumptions used for purposes of determining stock-based compensation, among others. Estimates and assumptions are also required to value assets acquired and liabilities assumed as well as contingent consideration, where applicable, in conjunction with business combinations. The Company bases its estimates on historical experience and on various other assumptions that it believes to be reasonable, the results of which form the basis for making judgments about the carrying value of assets and liabilities.
Stock-Based Compensation	The Company recognizes stock-based compensation expense using the accelerated attribution method, net of estimated forfeitures, in which compensation cost for each vesting tranche in an award is recognized ratably from the service inception date to the vesting date for that tranche.
Earnings Per Share	Diluted net loss per share is the same as basic net loss per share for all periods presented because the effects of potentially dilutive items were anti-dilutive given the Company’s net loss.
Income Taxes	At the end of each interim reporting period, the Company estimates its effective income tax rate expected to be applicable for the full year. This estimate is used to determine the income tax provision or benefit on a year-to-date basis and may change in subsequent interim periods.

Significant Accounting Polici17

Significant Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Schedule of New Accounting Pronouncements and Changes in Accounting Principles	Standard Description Effect on the Financial Statements or Other Significant Matters Standards that the Company has not yet adopted Revenue Recognition: Accounting Standards Update ("ASU") 2014-09, Revenue from Contracts with Customers (Topic 606) The Company's adoption date: January 1, 2018 The standard will replace existing revenue recognition standards and provides that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2014-09 also requires improved disclosures to help users of financial statements better understand the nature, amount, timing, and uncertainty of revenue that is recognized. Entities have the option of using either a full retrospective or modified retrospective approach for the adoption of the standard. The Company formed a project team to evaluate and direct the implementation of the new revenue recognition standard and related amendments. The project team developed an implementation plan centered around specific functional areas that may be impacted by the standard and its amendments, including accounting and reporting, information technology ("IT"), internal audit and contracts and legal, among others. This team has recently completed certain IT updates to the Company's accounting system to support recognition and disclosure under the new standard, and is continuing to make additional updates to facilitate the standard's adoption and reporting requirements. The project team completed an initial contract assessment on a sample of contracts and analyzed the Company's contract portfolio and associated contract costs. The team is finalizing the Company's remaining accounting positions under ASU 2014-09, as amended, including certain significant judgments and estimates required, and is currently assessing the potential changes to internal controls and the tax effect implications. The project team has reported the findings and progress of the implementation plan to management and to the Audit Committee on a frequent basis over the last two years and will continue to do so as the effective date of the new standard approaches. The Company anticipates that the adoption of the new standard will impact the timing of revenue recognition of fixed fees for its contracts, as well as the accounting for costs to obtain contracts. For managed-service contracts, the Company currently defers revenue until the completion of the implementation services, at which point the Company recognizes a cumulative catch-up adjustment equal to the revenue earned during the implementation period but previously deferred. The remaining balance of these fixed fees is recognized ratably over the remaining term of the contract. Under the new standard, the Company expects revenue recognition for the managed-service subscription and implementation fees to begin on the launch date and to be recognized over time through the contract end date, with no cumulative catch-up adjustment on the launch date. Further, the Company currently expenses sales commissions and related bonuses as incurred. Under the new standard, the Company will be required to defer and amortize a portion of these contract costs. The Company intends to adopt the new standard using the modified retrospective transition method effective January 1, 2018. The Company continues to evaluate the provisions of the new standard to identify further potential impacts to its consolidated financial statements. ASU 2016-08, Principal Versus Agent Considerations (Reporting Revenue Gross Versus Net) The Company's adoption date: January 1, 2018 The standard clarifies implementation guidance on principal versus agent considerations in ASU 2014-09. ASU 2016-10, Identifying Performance Obligations and Licensing The Company's adoption date: January 1, 2018 The standard clarifies implementation guidance on the identification of performance obligations and the licensing implementation guidance in ASU 2014-09. ASU 2016-12, Narrow-Scope Improvements and Practical Expedients The Company's adoption date: January 1, 2018 The standard clarifies the guidance on assessing collectability, presentation of sales taxes, noncash consideration and completed contracts and contract modifications at transition. ASU 2016-20, Technical Corrections and Improvements to Topic 606 The Company's adoption date: January 1, 2018 The standard clarifies certain narrow aspects of ASU 2014-09. Leases: ASU 2016-02, Leases (Topic 842) The Company's adoption date: January 1, 2019 The standard requires that lessees recognize assets and liabilities for leases with lease terms greater than twelve months in the statement of financial position. The standard also requires improved disclosures to help users of financial statements better understand the amount, timing and uncertainty of cash flows arising from leases. The Company is currently evaluating the impact the adoption of the standard will have on its consolidated financial statements. Financial Instruments: ASU 2016-13, Financial Instruments - Credit Losses (Topic 326) The Company's adoption date: January 1, 2020 The standard replaces the incurred loss impairment methodology in current U.S. GAAP (defined below) with a methodology that reflects expected credit losses. The update is intended to provide financial statement users with more useful information about expected credit losses. The Company is currently evaluating the impact the adoption of the standard will have on its consolidated financial statements. Cash Flow: ASU 2016-18, Restricted Cash The Company's adoption date: January 1, 2018 The standard requires that entities show the changes in the total of cash, cash equivalents and restricted cash in the statement of cash flows. Transfers between cash, cash equivalents and restricted cash should not be presented as cash flow activities on the statement of cash flows. The Company is currently evaluating the impact the adoption of the standard will have on its consolidated financial statements. Standards that the Company has recently adopted Stock-Based Compensation: ASU 2016-09, Improvements to Employee Share-Based Payment Accounting (Topic 718) The Company's adoption date: January 1, 2017 The standard is intended to simplify several aspects of the accounting for share-based payment transactions, including the accounting for income taxes, forfeitures, and statutory tax withholding requirements, as well as classification in the statement of cash flows. The Company adopted this standard effective January 1, 2017. As a result of this adoption, the Company recognized $8.2 million of deferred tax assets attributable to accumulated excess tax benefits that under the previous guidance could not be recognized until the benefits were realized through a reduction in income taxes payable. This adjustment was applied using a modified retrospective method with a cumulative-effect adjustment to the accumulated deficit for the excess tax benefits not previously recognized. However, given the full valuation allowance of $8.2 million placed on the additional deferred tax assets, the recognition upon adoption had no impact on the Company's accumulated deficit as of January 1, 2017. Further, the Company has elected to continue to estimate forfeitures to determine the amount of compensation cost to be recognized in each period.

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2017
Stockholders' Equity Attributable to Parent [Abstract]
Schedule of Stockholders Equity	The following table summarizes the stockholders' equity activity for the nine months ended September 30, 2017 (in thousands): Balance as of December 31, 2016 $ 86,997 Exercise of stock options and vesting of restricted stock units 625 Stock-based compensation expense 9,132 Statutory tax withholding related to net-share settlement of restricted stock units (2,581 ) Net loss (16,096 ) Foreign currency translation adjustments 719 Balance as of September 30, 2017 $ 78,796

Business Combinations, Goodwi19

Business Combinations, Goodwill and Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2017
Business Combinations [Abstract]
Schedule of Goodwill	The following table shows the changes in the carrying amount of goodwill for the nine months ended September 30, 2017 (in thousands): Balance as of December 31, 2016 $ 21,632 Goodwill attributable to the HubLogix acquisition 1,854 Balance as of September 30, 2017 $ 23,486
Schedule of Intangible Assets	The estimated useful lives and amortization methodology used in computing amortization are as follows: Estimated Useful Life Amortization Methodology Customer relationships 7 years Straight-line Acquired technology 7 years Straight-line Trade names 3 years Straight-line

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Stock-Based Compensation Expense	Stock-based compensation expense is included in the following line items in the accompanying condensed consolidated statements of operations for the three and nine months ended September 30, 2017 and 2016 (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 Cost of revenue $ 259 $ 330 $ 753 $ 941 Sales and marketing 970 1,161 2,960 3,651 Research and development 588 496 1,659 1,485 General and administrative 1,023 878 3,760 4,130 $ 2,840 $ 2,865 $ 9,132 $ 10,207
Summary of Awards Granted in Period	During the nine months ended September 30, 2017 , the Company granted the following share-based awards: Number of Shares Underlying Grant Weighted Average Grant Date Fair Value Stock options 597,034 $ 4.21 Restricted stock units ("RSUs") 1,325,172 10.44 Total share-based awards 1,922,206 8.50

Net Loss Per Share (Tables)

Net Loss Per Share (Tables)	9 Months Ended
	Sep. 30, 2017
Earnings Per Share [Abstract]
Schedule of Securities Excluded from Calculation of Weighted Average Common Shares Outstanding	The following securities have been excluded from the calculation of weighted average common shares outstanding because the effect is anti-dilutive for the three and nine months ended September 30, 2017 and 2016 : Three and Nine Months Ended September 30, 2017 2016 Stock options 2,132,715 1,657,549 RSUs 2,547,941 2,342,444

Segment and Geographic Inform22

Segment and Geographic Information (Tables)	9 Months Ended
	Sep. 30, 2017
Segment Reporting [Abstract]
Summary of Revenue by Geography	he table below summarizes revenue by geography for the three and nine months ended September 30, 2017 and 2016 (in thousands). The Company categorizes domestic and international revenue from customers based on their billing address. Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 Domestic $ 23,156 $ 21,985 $ 69,354 $ 63,458 International 6,941 6,007 19,076 17,979 Total revenue $ 30,097 $ 27,992 $ 88,430 $ 81,437

Significant Accounting Polici23

Significant Accounting Policies (Details) - Accounting Standards Update 2016-09 $ in Millions	Jan. 01, 2017USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred tax assets, net	$ 8.2
Deferred tax assets, valuation allowance	$ 8.2

Stockholders' Equity - Changes

Stockholders' Equity - Changes in Equity (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance as of December 31, 2016			$ 86,997
Exercise of stock options and vesting of restricted stock units			625
Stock-based compensation expense			9,132
Statutory tax withholding related to net-share settlement of restricted stock units			(2,581)
Net loss	$ (4,055)	$ (2,552)	(16,096)	$ (13,842)
Foreign currency translation adjustments	184	$ (78)	719	$ (180)
Balance as of September 30, 2017	$ 78,796		$ 78,796

Business Combinations, Goodwi25

Business Combinations, Goodwill and Intangible Assets - Business Combinations (Details) - USD ($) $ in Thousands	May 26, 2017	Sep. 30, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill		$ 23,486	$ 21,632
HubLogix
Business Acquisition [Line Items]
Purchase price in cash	$ 2,300
Indemnification obligations of shareholders	400
Consideration transferred	2,300
Goodwill	1,900
Intangible assets	500
Working capital liability	$ 100
Transaction costs		$ 300

Business Combinations, Goodwi26

Business Combinations, Goodwill and Intangible Assets - Schedule of Goodwill (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2017USD ($)
Goodwill [Roll Forward]
Balance as of December 31, 2016	$ 21,632
Goodwill attributable to the HubLogix acquisition	1,854
Balance as of September 30, 2017	$ 23,486

Business Combinations, Goodwi27

Business Combinations, Goodwill and Intangible Assets - Goodwill and Intangible Assets (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Business Combinations [Abstract]
Change in goodwill					$ 0
Amortization expense	$ 200,000	$ 100,000	$ 500,000	$ 400,000

Business Combinations, Goodwi28

Business Combinations, Goodwill and Intangible Assets - Estimated Useful Lives and Amortization Methodology (Detail)	9 Months Ended
	Sep. 30, 2017
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Estimated useful life of intangible asset (in years)	7 years
Acquired technology
Finite-Lived Intangible Assets [Line Items]
Estimated useful life of intangible asset (in years)	7 years
Trade names
Finite-Lived Intangible Assets [Line Items]
Estimated useful life of intangible asset (in years)	3 years

Commitments (Details)

Commitments (Details) - Sales Tax Obligations $ in Millions	9 Months Ended
	Sep. 30, 2017USD ($)
Loss Contingencies [Line Items]
VDA liability for sales taxes	$ 2.5
VDA liability for sales taxes, payments	$ 0.9

Stock-Based Compensation - Summ

Stock-Based Compensation - Summary of Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Stock-Based Compensation [Line Items]
Stock-based compensation expense	$ 2,840	$ 2,865	$ 9,132	$ 10,207
Cost of revenue
Stock-Based Compensation [Line Items]
Stock-based compensation expense	259	330	753	941
Sales and marketing
Stock-Based Compensation [Line Items]
Stock-based compensation expense	970	1,161	2,960	3,651
Research and development
Stock-Based Compensation [Line Items]
Stock-based compensation expense	588	496	1,659	1,485
General and administrative
Stock-Based Compensation [Line Items]
Stock-based compensation expense	$ 1,023	$ 878	$ 3,760	$ 4,130

Stock-Based Compensation - Gran

Stock-Based Compensation - Grants in Period (Detail)	9 Months Ended
	Sep. 30, 2017$ / sharesshares
Number of Shares Underlying Grant
Stock options (in shares) | shares	597,034
Total share-based awards (in shares) | shares	1,922,206
Weighted Average Grant Date Fair Value
Stock options (in dollars per share) | $ / shares	$ 4.21
Total share-based awards (in dollars per share) | $ / shares	$ 8.50
Restricted stock units (RSUs)
Number of Shares Underlying Grant
Restricted stock units (RSUs) (in shares) | shares	1,325,172
Weighted Average Grant Date Fair Value
Restricted stock units (RSUs) (in dollars per share) | $ / shares	$ 10.44

Net Loss Per Share - Schedule o

Net Loss Per Share - Schedule of Securities Excluded from Calculation of Weighted Average Common Shares Outstanding (Detail) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from calculation of weighted average common shares outstanding (in shares)	2,132,715	1,657,549	2,132,715	1,657,549
RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from calculation of weighted average common shares outstanding (in shares)	2,547,941	2,342,444	2,547,941	2,342,444

Income Taxes (Detail)

Income Taxes (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Effective income tax rate	(0.90%)	1.00%	(1.30%)	0.70%
U.S. federal statutory tax rate	34.00%	34.00%	34.00%	34.00%

Segment and Geographic Inform34

Segment and Geographic Information - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2017segment
Segment Reporting [Abstract]
Number of reportable segment	1
Number of operating segment	1

Segment and Geographic Inform35

Segment and Geographic Information - Summary of Revenue by Geography (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Revenue	$ 30,097	$ 27,992	$ 88,430	$ 81,437
Domestic
Segment Reporting Information [Line Items]
Revenue	23,156	21,985	69,354	63,458
International
Segment Reporting Information [Line Items]
Revenue	$ 6,941	$ 6,007	$ 19,076	$ 17,979