HubSpot (HUBS) 10-K 24 Feb 16 2015 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2015	Feb. 12, 2016	Jun. 30, 2015
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	FY
Trading Symbol	HUBS
Entity Registrant Name	HUBSPOT INC
Entity Central Index Key	1,404,655
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		34,707,673
Entity Public Float			$ 1,049,025,000

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 55,580	$ 123,721
Short-term investments	48,972
Accounts receivable—net of allowance for doubtful accounts of $371 and $218 at December 31, 2015 and 2014, respectively	25,142	14,270
Deferred commission expense	8,114	5,995
Restricted cash		230
Prepaid hosting costs	3,047	1,777
Prepaid expenses and other current assets	4,899	3,516
Total current assets	145,754	149,509
Long-term investments	40,566
Property and equipment, net	18,161	11,381
Capitalized software development costs, net	4,655	4,433
Restricted cash	363
Other assets	1,007	116
Intangible assets, net	100	89
Goodwill	9,773	9,330
Total assets	220,379	174,858
Current liabilities:
Accounts payable	2,588	2,800
Accrued compensation costs	11,371	7,660
Other accrued expenses	12,313	7,953
Capital lease obligations	542	100
Deferred rent	86	110
Deferred revenue	64,407	40,805
Total current liabilities	91,307	59,428
Capital lease obligations, net of current portion	277	78
Deferred rent, net of current portion	6,345	4,153
Deferred revenue, net of current portion	732	500
Other long term liabilities	10
Total liabilities	$ 98,671	$ 64,159
Commitments and contingencies (Note 8)
Stockholders’ equity:
Common stock, $0.001 par value—authorized, 500,000 shares; issued and outstanding, 34,313 and 31,431 at December 31, 2015 and 2014, respectively	$ 34	$ 32
Additional paid-in capital	322,833	265,113
Accumulated other comprehensive loss	(805)	(145)
Accumulated deficit	(200,354)	(154,301)
Total stockholders’ equity	121,708	110,699
Total liabilities and stockholders’ equity	$ 220,379	$ 174,858

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Statement Of Financial Position [Abstract]
Accounts receivable, net of allowance for doubtful accounts	$ 371	$ 218
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	34,313,000	31,431,000
Common stock, shares outstanding	34,313,000	31,431,000

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues:
Subscription	$ 167,920	$ 106,319	$ 70,819
Professional services and other	14,023	9,557	6,815
Total revenue	181,943	115,876	77,634
Cost of Revenues:
Subscription	32,271	23,655	18,745
Professional services and other	15,652	11,425	8,759
Total cost of revenues	47,923	35,080	27,504
Gross profit	134,020	80,796	50,130
Operating expenses:
Research and development	32,457	25,638	15,018
Sales and marketing	112,629	78,809	53,158
General and administrative	35,408	24,958	16,204
Total operating expenses	180,494	129,405	84,380
Loss from operations	(46,474)	(48,609)	(34,250)
Other income (expense):
Interest income	390	46	34
Interest expense	(185)	(322)	(20)
Other income (expense)	628	564	(38)
Total other income (expense)	833	288	(24)
Loss before income tax (provision) benefit	(45,641)	(48,321)	(34,274)
Income tax (provision) benefit	(412)	92
Net loss	(46,053)	(48,229)	(34,274)
Preferred stock accretion		331	54
Net loss attributable to common stockholders	$ (46,053)	$ (48,560)	$ (34,328)
Net loss attributable to common stockholders per common share, basic and diluted	$ (1.39)	$ (4.20)	$ (6.71)
Weighted average common shares used in computing basic and diluted net loss attributable to common stockholders per common share:	33,222	11,562	5,113

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (46,053)	$ (48,229)	$ (34,274)
Other comprehensive loss:
Foreign currency translation adjustments	(272)	(66)	(69)
Changes in unrealized losses on investments	(388)
Comprehensive loss	$ (46,713)	$ (48,295)	$ (34,343)

Consolidated Statements of Rede

Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($) shares in Thousands, $ in Thousands	Total	IPO [Member]	Secondary Public Offering [Member]	Redeemable Convertible Preferred Stock [Member]	Common Stock [Member]	Common Stock [Member]IPO [Member]	Common Stock [Member]Secondary Public Offering [Member]	Additional Paid-In Capital [Member]	Additional Paid-In Capital [Member]IPO [Member]	Additional Paid-In Capital [Member]Secondary Public Offering [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Equity (Deficit) [Member]
Beginning Balance at Dec. 31, 2012	$ (63,209)			$ 101,239	$ 5			$ 8,594			$ (10)	$ (71,798)
Beginning Balance, shares at Dec. 31, 2012				58,589	5,004
Exercise of common stock options	621							621
Exercise of common stock options, shares					230
Stock based compensation	3,353							3,353
Restricted shares vesting	384							384
Vesting of restricted common stock, shares					67
Accretion of redeemable convertible preferred stock to redemption	(54)			$ 54				(54)
Cumulative translation adjustment	(69)										(69)
Net loss	(34,274)											(34,274)
Ending Balance, Amount at Dec. 31, 2013	(93,248)			$ 101,293	$ 5			12,898			(79)	(106,072)
Ending Balance, shares at Dec. 31, 2013				58,589	5,301
Exercise of common stock options	3,794				$ 1			3,793
Exercise of common stock options, shares					850
Stock based compensation	16,593							16,593
Accretion of redeemable convertible preferred stock to redemption	(331)			$ 331				(331)
Conversion of preferred stock to common stock	101,624			$ (101,624)	$ 20			101,604
Conversion of preferred stock to common stock, shares				(58,589)	19,530
Issuance of common stock, value		$ 130,562				$ 6			$ 130,556
Issuance of common stock, shares						5,750
Cumulative translation adjustment	(66)										(66)
Net loss	(48,229)											(48,229)
Ending Balance, Amount at Dec. 31, 2014	$ 110,699				$ 32			265,113			(145)	(154,301)
Ending Balance, shares at Dec. 31, 2014					31,431
Exercise of common stock options, shares	1,334
Issuance of common stock under stock plans, net of shares withheld for employee taxes	$ 2,253				$ 1			2,252
Issuance of common stock under stock plans, net of shares withheld for employee taxes, shares					1,910
Stock based compensation	21,800							21,800
Issuance of common stock, value			$ 33,669				$ 1			$ 33,668
Issuance of common stock, shares							972
Unrealized loss on investments	(388)										(388)
Cumulative translation adjustment	(272)										(272)
Net loss	(46,053)											(46,053)
Ending Balance, Amount at Dec. 31, 2015	$ 121,708				$ 34			$ 322,833			$ (805)	$ (200,354)
Ending Balance, shares at Dec. 31, 2015					34,313

Consolidated Statements of Red7

Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) (Parenthetical) $ in Thousands	12 Months Ended
	Dec. 31, 2014USD ($)
Statement Of Stockholders Equity [Abstract]
Net offering costs incurred	$ 3,126

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Activities:
Net loss	$ (46,053)	$ (48,229)	$ (34,274)
Adjustments to reconcile net loss to net cash and cash equivalents used in operating activities:
Depreciation and amortization	7,343	5,714	4,472
Stock-based compensation	21,308	16,358	3,464
Provision for income taxes	(50)	(133)
Amortization of bond premiums	671
Non-cash rent expense	1,793	286	908
Unrealized currency translation	(329)	(213)
Changes in assets and liabilities
Accounts receivable	(11,249)	(7,258)	(1,955)
Prepaid expenses and other assets	(3,373)	(713)	(3,351)
Deferred commission expense	(2,119)	(2,004)	(1,155)
Accounts payable	(508)	286	(1,158)
Accrued expenses	7,085	4,734	4,259
Restricted cash		157	(67)
Deferred rent	392	1,467	258
Deferred revenue	24,666	17,084	8,791
Net cash and cash equivalents used in operating activities	(423)	(12,464)	(19,808)
Investing Activities:
Purchases of investments	(113,615)
Maturity of investments	23,018
Purchases of property and equipment	(8,427)	(7,266)	(4,358)
Capitalization of software development costs	(4,314)	(4,634)	(3,432)
Acquisition of a business	(600)
Acquisition of intangible assets		(80)	(190)
Restricted cash	(166)	1,500	(1,190)
Net cash and cash equivalents used in investing activities	(104,104)	(10,480)	(9,170)
Financing Activities:
Proceeds from common stock offerings, net of offering costs paid of $583 in 2015 and $2,924 in 2014	33,669	130,764
Employee taxes paid related to the net share settlement of stock-based awards	(8,607)
Proceeds related to the issuance of common stock under stock plans	12,083	3,794	621
Proceeds from draw-down on line of credit		18,000
Payments on line of credit		(18,000)
Repayment of capital lease obligations	(206)	(121)	(107)
Net cash and cash equivalents provided by financing activities	36,939	134,437	514
Effect on exchange rate changes on cash and cash equivalents	(553)	(415)	10
Net (decrease) increase in cash and cash equivalents	(68,141)	111,078	(28,454)
Cash and cash equivalents, beginning of year	123,721	12,643	41,097
Cash and cash equivalents, end of year	55,580	123,721	12,643
Supplemental cash flow disclosure:
Cash paid for interest	185	199	3
Cash paid for income taxes	215
Non-cash investing and financing activities:
Property and equipment acquired under capital lease	847		299
Capital expenditures incurred but not yet paid	$ 435	111	1,499
IPO costs incurred but not yet paid		202
Accretion of preferred stock		331	$ 54
Conversion of preferred stock to common stock		$ 101,624

Consolidated Statements of Cas9

Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Statement Of Cash Flows [Abstract]
Offering cost paid on initial public offering	$ 583	$ 2,924

Organization and Operations

Organization and Operations	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Organization and Operations	1. Organization and Operations HubSpot, Inc. (the “Company”), was formed as a limited liability company in Delaware on April 4, 2005. The Company converted to a Delaware corporation on June 7, 2007. The Company provides a cloud-based inbound marketing and sales platform which features integrated applications to help businesses attract visitors to their websites, convert visitors into leads, close leads into customers and delight customers so they become promoters of those businesses. These integrated applications include social media, search engine optimization, blogging, website content management, marketing automation, email, CRM, analytics, and reporting. The Company is headquartered in Cambridge, Massachusetts, and has wholly-owned subsidiaries in Dublin, Ireland, which commenced operations in January of 2013, in Sydney, Australia, which commenced operations in August of 2014, and in Singapore which commenced operations in October 2015. On October 15, 2014, the Company closed its initial public offering (“IPO”) whereby 5,750,000 shares of common stock were sold to the public, including the underwriters’ overallotment option of 750,000 shares of common stock, at a price of $25.00 per share. The Company received aggregate proceeds of approximately $133.7 million from the IPO, net of underwriters’ discounts and commissions, but before deduction of offering expenses of approximately $3.1 million. Upon the closing of the IPO, all shares of the Company’s outstanding convertible preferred stock automatically converted into 19,529,713 shares of common stock. On March 24, 2015, the Company closed a common stock public offering whereby 971,891 shares of common stock were sold to the public, including the underwriters’ overallotment option of 121,891 shares of common stock, at a price of $37.00 per share. The Company received aggregate proceeds of approximately $34.3 million from the offering, net of underwriters’ discounts and commissions, but before deduction of offering expenses of approximately $583 thousand.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	2. Summary of Significant Accounting Policies Basis of Presentation —The consolidated financial statements have been prepared in U.S. dollars, in accordance with accounting principles generally accepted in the United States of America (“GAAP”). The accompanying consolidated financial statements include the accounts of the Company and its wholly owned subsidiary. All intercompany transactions have been eliminated in consolidation. Use of Estimates —The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from those estimates. Operating Segments —The Company operates as one operating segment. Operating segments are defined as components of an enterprise for which separate financial information is regularly evaluated by the chief operating decision makers (“CODMs”), which are the Company’s chief executive officer and chief operating officer, in deciding how to allocate resources and assess performance. The Company’s CODMs evaluate the Company’s financial information and resources and assess the performance of these resources on a consolidated basis. Since the Company operates in one operating segment, all required financial segment information can be found in the consolidated financial statements. Loss Per Share — Basic net loss attributable to common stockholders per share is computed by dividing net loss attributable to common stockholders by the weighted average number of common shares outstanding for the period. Diluted net loss attributable to common stockholders per share is computed by giving effect to all potential dilutive common stock equivalents outstanding for the period. For purposes of this calculation, options to purchase common stock, common stock warrants, restricted stock units (“RSUs”) and redeemable convertible preferred stock are considered to be potential common stock equivalents. The Company applied the two-class method to calculate its basic and diluted net loss per share of common stock for the year ended December 31, 2013, as its convertible preferred stock and common stock are participating securities. The two-class method is an earnings allocation formula that treats a participating security as having rights to earnings that otherwise would have been available to common stockholders. However, the two-class method does not impact the net loss per share of common stock as the Company was in a loss position for the year ended December 31, 2013 and preferred stockholders did not participate in losses. A reconciliation of the denominator used in the calculation of basic and diluted loss per share is as follows: Year Ended December 31, 2015 2014 2013 (in thousands, except per share amounts) Numerator: Net loss attributable to common stockholders $ (46,053 ) $ (48,560 ) $ (34,328 ) Denominator: Weighted-average common shares outstanding—basic 33,222 11,562 5,113 Dilutive effect of share equivalents resulting from stock options, RSUs, common stock warrant and redeemable convertible preferred shares (as converted) — — — Weighted-average common shares outstanding-diluted 33,222 11,562 5,113 Net loss per common share, basic and diluted $ (1.39 ) $ (4.20 ) $ (6.71 ) Additionally, since the Company incurred net losses for the years ended December 31, 2015, 2014 and 2013, diluted net loss attributable to common stockholders per share is the same as basic net loss attributable to common stockholders. The Company’s outstanding stock options, common stock warrant, redeemable convertible preferred stock, and RSUs are not included in the calculation of diluted loss per share as the effect would be anti-dilutive. The following table contains share totals with a potentially dilutive impact: Year Ended December 31, 2015 2014 2013 (in thousands) Options to purchase common shares 3,331 4,588 4,695 Common stock warrant — 13 13 Convertible preferred shares (as converted) — — 19,530 RSUs 1,703 1,376 858 Cash and Cash Equivalents —The Company considers all highly liquid investments purchased with original maturity of three months or less to be cash equivalents. Cash and cash equivalents consist of cash held in bank deposit accounts and short-term, highly-liquid investments with remaining maturities of three months or less at the date of purchase, consisting of money-market funds. Investments — Investments consist of corporate debt securities and U.S. government agency obligations. Securities having remaining maturities of more than three months at the date of purchase and less than one year from the date of the balance sheets are classified as short-term, and those with maturities of more than one year from the date of the balance sheet are classified as long-term in the consolidated balance sheets. The Company classifies its debt investments with readily determinable market values as available-for-sale. These investments are classified as investments on the consolidated balance sheets and are carried at fair market value, with unrealized gains and losses considered to be temporary in nature reported as accumulated other comprehensive loss, a separate component of stockholders’ equity. The Company reviews all investments for reductions in fair value that are other-than-temporary. When such reductions occur, the cost of the investment is adjusted to fair value through recording a loss on investments in the consolidated statements of operations. Gains and losses on investments are calculated on the basis of specific identification. Investments are considered to be impaired when a decline in fair value below cost basis is determined to be other-than-temporary. The Company periodically evaluates whether a decline in fair value below cost basis is other-than-temporary by considering available evidence regarding these investments including, among other factors: the duration of the period that, and extent to which, the fair value is less than cost basis; the financial health of, and business outlook for the issuer, including industry and sector performance and operational and financing cash flow factors; overall market conditions and trends and the Company’s intent and ability to retain its investment in the security for a period of time sufficient to allow for an anticipated recovery in market value. Once a decline in fair value is determined to be other-than-temporary, a write-down is recorded and a new cost basis in the security is established. Accounts Receivable and Allowance for Doubtful Accounts —Accounts receivable are carried at the original invoiced amount less an allowance for doubtful accounts based on the probability of future collection. When management becomes aware of circumstances that may decrease the likelihood of collection, it records a specific allowance against amounts due, which reduces the receivable to the amount that management reasonably believes will be collected. For all other customers, management determines the adequacy of the allowance based on historical loss patterns, the number of days that billings are past due and an evaluation of the potential risk of loss associated with specific accounts. To date, losses resulting from uncollected receivables have not exceeded management’s expectations. The following is a rollforward of the Company’s allowance for doubtful accounts (in thousands): Balance Beginning of Period Charged to Statement of Operations Deductions (1) Balance at End of Period Allowance for doubtful accounts Year ended December 31, 2015 $ 218 $ 1,367 $ (1,214 ) $ 371 Year ended December 31, 2014 $ 175 $ 632 $ (589 ) $ 218 Year ended December 31, 2013 $ 122 $ 523 $ (470 ) $ 175 (1) Deductions include actual accounts written-off, net of recoveries. Restricted Cash —The Company had restricted cash of $363 thousand at December 31, 2015 and $230 thousand at December 31, 2014 related to landlord guarantees for leased facilities. Property and Equipment —Property and equipment are stated at cost and depreciated using the straight-line method over the estimated useful lives of the related assets. Expenditures for maintenance and repairs are charged to expense as incurred, whereas major betterments are capitalized as additions to leasehold improvements. Depreciation is recorded over the following estimated useful lives: Estimated Useful Life Employee related computer equipment 2 years Computer equipment and purchased software 3 years Office equipment 5 years Furniture and fixtures 5 years Leasehold improvements Lesser of lease Impairment of Long-Lived Assets —Long-lived assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of the asset may not be recoverable or that the useful lives of those assets are no longer appropriate. Management considers the following potential indicators of impairment of its long-lived assets (asset group): a substantial decrease in the Company’s stock price, a significant adverse change in the extent or manner in which a long-lived asset (asset group) is being used, a significant adverse change in legal factors or in the business climate that could affect the value of the long-lived asset (asset group), an accumulation of costs significantly in excess of the amount originally expected for the acquisition or construction of a long-lived asset (asset group), and a current expectation that, more likely than not, a long lived asset (asset group) will be sold or otherwise disposed of significantly before the end of its previously estimated useful life. When such events occur, the Company compares the carrying amounts of the assets to their undiscounted expected future cash flows. If this comparison indicates that there may be an impairment, the amount of the impairment is calculated as the difference between the carrying value and fair value. For the years presented, the Company did not recognize an impairment charge. Goodwill —Goodwill represents the excess of cost over the fair value of the net tangible and identifiable intangible assets acquired in a business combination. The Company has no other intangible assets with indefinite useful lives. Goodwill is not subject to amortization, but is monitored annually for impairment or more frequently if there are indicators of impairment. Management considers the following potential indicators of impairment: significant underperformance relative to historical or projected future operating results, significant changes in the Company’s use of acquired assets or the strategy of the Company’s overall business, significant negative industry or economic trends and a significant decline in the Company’s stock price for a sustained period. The Company performs its annual impairment test on November 30. Currently, the Company’s goodwill is evaluated at the entity level as it is determined there is only one reporting unit. The Company performs a two-step impairment test. In the first step, the fair value of each reporting unit is compared to its carrying amount. If the fair value exceeds the carrying value of the net assets assigned, goodwill is not considered impaired and the second step is not required. If the carrying value exceeds the fair value, then the second step of the impairment test is performed in order to determine the implied fair value of the reporting unit’s goodwill. If the carrying value of the goodwill exceeds the fair value, then an impairment charge is recorded. On November 30, 2015 the fair value of the Company’s single reporting unit exceeded its carrying amount. Because the fair value of the Company’s single reporting unit was in excess of its carrying value and there were no indicators that the Company’s goodwill had become impaired since that date, there was no impairment as of November 30, 2015 through December 31, 2015. For the years ended December 31, 2015, 2014 and 2013, the Company did not recognize an impairment charge. Advertising Expense —The Company expenses advertising as incurred, which is included in sales and marketing expense in the accompanying consolidated statements of operations. The Company incurred $4.9 million of advertising expense in 2015, $3.3 million in 2014, and $3.5 million in 2013. Revenue Recognition —The Company primarily generates revenue from multiple-element arrangements, which typically include subscriptions to its online software solution and professional services which includes on-boarding and training services. The Company’s customers do not have the right to take possession of the online software solution. The Company recognizes revenue when all of the following have occurred: · persuasive evidence of an arrangement with the customer exists; · service has been or is being provided; · the fees are fixed or determinable; and · collectability of the fees is reasonably assured. The Company’s arrangements do not contain general rights of return. In order to treat elements in a multiple-element arrangement as separate units of accounting, the delivered elements must have standalone value and delivery of the undelivered element is probable and within control of the Company. The Company has determined that subscriptions for its online software solution have standalone value because, once a customer launches its initial site, the online software solution is fully functional and does not require any additional development, modification, or customization. Professional services consists primarily of on-boarding and web-based and in-person training, are not required to use the online software solution, and are determined to have stand-alone value from the related subscription services because they are sold separately by the Company and third parties. When multiple-element arrangements are separated into different units of accounting, the arrangement consideration is allocated to the identified separate units based on a relative selling price hierarchy. The estimated fair value of each element is determined based upon the following hierarchy: (1) vendor specific objective evidence (“VSOE”) of fair value, (2) third party evidence of selling price (“TPE”), or (3) the Company’s best estimate of selling price (“BESP”). The Company is not able to establish VSOE of fair value for undelivered elements, which in most instances is subscription and training and professional services, based on its pricing practices, and there is not a reliable measure of TPE of selling price. As such, arrangement consideration is allocated amongst multiple deliverable arrangements using BESP. The Company establishes BESP for each deliverable primarily considering the median of actual sales prices of each type of subscription and other professional services sold. The Company considers each type of subscription and service as well as pricing and geographic information when establishing BESP. Arrangement consideration is allocated such that the revenue recognized does not exceed the fee subject to refund. Revenue from subscriptions is recognized ratably over the subscription period beginning on the date the Company’s subscription is made available to customers. Substantially all subscription contracts are one year or less. The Company recognizes revenue from on-boarding and training services as the services are provided. The Company pays its marketing agency partners a commission of the subscription sales price for sales to customers. The classification of the commission paid on the Company’s consolidated statements of operations depends on who is purchasing its subscription. In instances where the customer is purchasing the subscription, the Company is the primary obligor and records the commission paid to the agency partner as sales and marketing expense. When the agency partner purchases the subscription directly from the Company, the Company nets the consideration paid to the partner against the associated revenue it recognizes, as in these instances the Company’s customer is the partner and the Company’s remaining obligations are to the partner. The Company does not believe that it receives a tangible benefit from the payment back to the partner. The Company has $4.9 million accrued for partner commissions at December 31, 2015 and $2.8 million accrued for partner commissions at December 31, 2014. These amounts are included within other accrued expenses on the balance sheets. Sales taxes collected from customers and remitted to government authorities are excluded from revenue. Amounts that have been invoiced are recorded in accounts receivable and deferred revenue or revenue, depending on whether the revenue recognition criteria have been met. Deferred revenue represents amounts billed for which revenue has not yet been recognized. Deferred revenue that will be recognized during the succeeding 12-month period is recorded as current deferred revenue and the remaining portion is recorded as long-term deferred revenue. Concentrations of Credit Risk and Significant Customers —Financial instruments that potentially expose the Company to concentrations of credit risk consist primarily of cash, investments and accounts receivable. A significant portion of the Company’s cash and cash equivalents is held at one financial institution that management believes to be of high credit quality. Although the Company deposits it cash and cash equivalents with multiple financial institutions, its deposits exceed federally insured limits. The Company’s investments consist of highly rated corporate debt securities and U.S. government agency obligations . The Company limits the amount of investments in any single issuer. The Company believes that, as of December 31, 2015, its concentration of credit risk related to investments was not significant. The Company has no significant off-balance sheet risk such as foreign exchange contracts, option contracts, or other hedging arrangements. The Company generally does not require collateral from its customers and generally requires payment 30 days from the invoice date. The Company maintains an allowance for doubtful accounts based on its assessment of the collectability of accounts receivable. Credit risk arising from accounts receivable is mitigated as a result of transacting with a large number of geographically dispersed customers spread across various industries. At December 31, 2015 and 2014 there were no customers that represented more than 10% of the net accounts receivable balance. There were no customers that individually exceeded 10% of the Company’s revenue in any of the periods presented. Foreign Currency —The functional currency of the Company’s foreign subsidiaries is the local currency. Assets and liabilities denominated in a foreign currency are translated into U.S. dollars at the exchange rates in effect at the balance sheet dates; with the resulting translation adjustments directly recorded to a separate component of accumulated other comprehensive loss. Income and expense accounts are translated at the weighted-average exchange rates during the period. Foreign currency transaction gains and losses are recorded in other income (expense). Research and Development —Research and development expenses include payroll, employee benefits and other expenses associated with product development. Capitalized Software Development Costs —Certain payroll and stock compensation costs incurred to develop functionality for the Company’s software platform, as well as certain upgrades and enhancements that are expected to result in increased functionality are capitalized. The costs incurred in the preliminary stages of development are expensed as incurred. Once an application has reached the development stage, certain internal costs are capitalized until the software is substantially complete and ready for its intended use. Capitalized software development costs are amortized on a straight-line basis over their estimated useful life of two years. Management evaluates the useful lives of these assets on an annual basis and tests for impairment whenever events or changes in circumstances occur that could impact the recoverability of these assets. Capitalized software development costs consisted of the following: December 31, 2015 December 31, 2014 (in thousands) Gross capitalized software development costs $ 18,737 $ 14,219 Accumulated amortization (14,082 ) (9,786 ) Capitalized software development costs, net $ 4,655 $ 4,433 The Company capitalized software development costs of $4.5 million in 2015, $4.9 million in 2014, and $3.7 million in 2013. Stock-based compensation costs included in capitalized software were $492 thousand in 2015, $235 thousand in 2014, and $273 thousand in 2013. Amortization of capitalized software development costs was $4.6 million in 2015, $3.9 million in 2014, and $2.6 million in 2013. Amortization expense is included in cost of revenue in the consolidated statements of operations. Income Taxes —Deferred tax assets and liabilities are recognized for the differences between the financial statement carrying amounts and the tax bases of existing assets and liabilities using tax rates expected to be in effect in the years in which the differences are expected to reverse. Deferred tax assets are reduced by a valuation allowance if it is more likely than not that some portion or all of the deferred tax assets will not be realized. Accounting for uncertainty in income taxes recognized in the financial statements is in accordance with accounting authoritative guidance, which prescribes a two-step process to determine the amount of tax benefit to be recognized. First, the tax position must be evaluated to determine the likelihood that it will be sustained upon external examination. If the tax position is deemed “more-likely-than-not” to be sustained, the tax position is then assessed to determine the amount of benefit to recognize in the financial statements. The amount of the benefit that may be recognized is the largest amount that has a greater than 50 percent likelihood of being realized upon ultimate settlement. Our intention is to reinvest the total amount of our unremitted foreign earnings in the local international jurisdictions, except for instances where we can remit such earnings to the U.S. without an associated net tax cost. As a result, we do not provide for United States taxes on the unremitted earnings of our international subsidiaries. Stock-Based Compensation —The Company accounts for all stock options and awards granted to employees and nonemployees using a fair value method. Stock-based compensation is recognized as an expense and is measured at the fair value of the award. The measurement date for employee awards is generally the date of the grant. The measurement date for nonemployee awards is generally the date the awards vest. Stock-based compensation costs are recognized as expense over the requisite service period, which is generally the vesting period for awards, on a straight-line basis for awards with only a service condition, and using the graded-method for awards with both a performance and service that were granted prior to our IPO, and on a straight-line basis for the awards that were granted following our IPO. Recent Accounting Pronouncements — In November 2015, the Financial Accounting Standards Board (FASB) issued updated guidance that allows entities to present deferred tax assets and deferred tax liabilities as noncurrent in a classified balance sheet. The update simplifies the current guidance, which requires entities to separately present deferred tax assets and deferred tax liabilities as current and noncurrent in a classified balance sheet. The guidance is required for annual reporting periods beginning after December 15, 2016, including interim periods within the reporting period. The Company early adopted the provisions of this update during the fourth quarter of fiscal year 2015 and applied it retrospectively. Adoption of this standard did not materially impact results of operations, retained earnings, or cash flows in the current or previous interim and annual reporting periods. In September 2015, the FASB issued updated guidance related to simplifying the accounting for measurement period adjustments related to business combinations. The amended guidance eliminates the requirement to retrospectively account for adjustments made during the measurement period. The standard is effective beginning January 1, 2016, with early adoption permitted. The Company does not expect it to have a material impact on our consolidated financial position, results of operations or cash flows. In May 2014, the FASB issued updated guidance and disclosure requirements for recognizing revenue. The new revenue recognition standard provides a five-step analysis of transactions to determine when and how revenue is recognized. The core principle is that a company 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. In July 2015, the FASB approved the deferral of the new standard's effective date by one year. The new standard now is effective for annual and interim reporting periods beginning December 15, 2017. The FASB will permit companies to adopt the new standard early, but not before the original effective date of December 15, 2016. The Company is evaluating the potential impact of adopting this new accounting guidance. Reclassifications — Certain prior year amounts have been reclassified to conform with the current year’s presentation. During the year ended December 31, 2015, the Company classified $2.9 million of credit card fees associated with customer payments within general and administrative expenses on the consolidated statements of operations. Accordingly, the Company reclassified $2.0 million of credit card fees associated with customer payments for the year ended December 31, 2014 and $1.5 million of credit card fees associated with customer payments for the year ended December 31, 2013 from cost of revenues, subscription to general and administrative expenses to conform with this presentation.

Fair Value of Financial Instrum

Fair Value of Financial Instruments	12 Months Ended
	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	3. Fair Value of Financial Instruments The Company measures certain financial assets at fair value. Fair value is determined based upon the exit price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants, as determined by either the principal market or the most advantageous market. Inputs used in the valuation techniques to derive fair values are classified based on a three-level hierarchy, as follows: Level 1 — Quoted prices in active markets for identical assets or liabilities. Level 2 — Observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets with insufficient volume or infrequent transactions (less active markets); or model-derived valuations in which all significant inputs are observable or can be derived principally from or corroborated by observable market data for substantially the full term of the assets or liabilities. Level 3 — Unobservable inputs to the valuation methodology that are significant to the measurement of fair value of assets or liabilities. The following table details the fair value measurements within the fair value hierarchy of the Company’s financial assets and liabilities at December 31, 2015 and December 31, 2014. December 31, 2015 Level 1 Level 2 Level 3 Total (in thousands) Money market funds $ 32,014 $ — $ — $ 32,014 Commercial paper — 7,711 — 7,711 Corporate bonds — 70,869 — 70,869 U.S. government agency obligations — 10,958 — 10,958 Total $ 32,014 $ 89,538 $ — $ 121,552 December 31, 2014 Level 1 Level 2 Level 3 Total (in thousands) Money market funds $ 100,000 $ — $ — $ 100,000 Total $ 100,000 $ — $ — $ 100,000 The Company considers all highly liquid investments purchased with a remaining maturity of three months or less to be cash equivalents. The fair value of the Company’s investments in certain money market funds is their face value and such instruments are classified as Level 1 and are included in cash and cash equivalents on the consolidated balance sheets. At December 31, 2015, our Level 2 securities were priced by pricing vendors. These pricing vendors utilize the most recent observable market information in pricing these securities or, if specific prices are not available for these securities, use other observable inputs like market transactions involving identical or comparable securities. For certain other financial instruments, including accounts receivable, accounts payable, capital leases and other current liabilities, the carrying amounts approximate their fair value due to the relatively short maturity of these balances. The following tables summarize the composition of our short- and long-term investments at December 31, 2015. The Company did not have any investments at December 31, 2014. December 31, 2015 Amortized Cost Unrealized Gains Unrealized (Losses) Aggregate Fair Value (in thousands) Commercial paper $ 7,721 $ — $ (10 ) $ 7,711 Corporate bonds 71,207 — (338 ) 70,869 U.S. government agency obligations 10,998 — (40 ) 10,958 Total $ 89,926 $ — $ (388 ) $ 89,538 For all of our securities for which the amortized cost basis was greater than the fair value at December 31, 2015, the Company has concluded that there is no plan to sell the security nor is it more likely than not that the Company would be required to sell the security before its anticipated recovery. In making the determination as to whether the unrealized loss is other-than-temporary, the Company considered the length of time and extent the investment has been in an unrealized loss position, the financial condition and near-term prospects of the issuers, the issuers’ credit rating and the time to maturity. Contractual Maturities The contractual maturities of short-term and long-term investments held at December 31, 2015 are as follows: December 31, 2015 Amortized Cost Basis Aggregate Fair Value ( in thousands) Due within one year $ 49,068 $ 48,972 Due after 1 year through 2 years 40,858 40,566 Total $ 89,926 $ 89,538

Property and Equipment

Property and Equipment	12 Months Ended
	Dec. 31, 2015
Property Plant And Equipment [Abstract]
Property and Equipment	4. Property and Equipment Property and equipment as of December 31, 2015 and December 31, 2014 consists of the following: December 31. 2015 2014 (in thousands) Computer equipment & purchased software $ 1,237 $ 904 Employee computer equipment 307 — Furniture and fixtures 3,907 3,010 Office equipment 1,209 1,118 Leasehold improvements 17,086 10,153 Equipment under capital lease 1,409 562 Total property and equipment 25,155 15,747 Less accumulated depreciation (6,994 ) (4,366 ) Property and equipment, net $ 18,161 $ 11,381 Depreciation expense was $2.7 million in 2015, $1.7 million in 2014, and $1.5 million in 2013. Accumulated depreciation for equipment under capital lease was $508 thousand as of December 31, 2015, $339 thousand as of December 31, 2014, and $272 thousand as of December 31, 2013

Intangible Assets

Intangible Assets	12 Months Ended
	Dec. 31, 2015
Goodwill And Intangible Assets Disclosure [Abstract]
Intangible Assets	5. Intangible Assets During the year ended December 31, 2015, the Company acquired certain assets and treated this purchase as a business combination. The Company paid cash considerations of $600 thousand for these assets and allocated $107 thousand to acquired technology, $50 thousand to certain other assets, and the remaining $443 thousand to goodwill. Intangible assets as of December 31, 2015 and 2014 consist of the following: Weighted Average Remaining Useful Life December 31, 2015 2014 (in thousands) Acquired technology 13 Months $ 852 $ 745 Acquired intellectual property 15 Months 80 80 Accumulated amortization (832 ) (736 ) Total $ 100 $ 89 The estimated useful life of acquired technology and intellectual property is three years. The Company evaluates the useful lives of these assets on an annual basis and tests for impairment whenever events or changes in circumstances occur that could impact the recoverability of these assets. The goodwill and intangible assets are expected to be deductible for U.S. federal income tax purposes. Amortization expense related to intangible assets was $96 thousand in 2015, $138 thousand in 2014, and $359 thousand in 2013. Amortization expense of acquired technology is included in cost of subscription revenue in the consolidated statements of operations. Amortization expense of acquired intellectual property is included in sales and marketing expense in the consolidated statements of operations. Estimated future amortization expense for intangible assets as of December 31, 2015 is as follows: Years ended December 31, Amortization Expense (in thousands) 2016 $ 84 2017 16 Total $ 100

Debt

Debt	12 Months Ended
	Dec. 31, 2015
Debt Disclosure [Abstract]
Debt	6. Debt The Company has a $35 million revolving line of credit outstanding (the “Loan Agreement”) that expires in March 2017. Under the Loan Agreement the Company is required to maintain compliance with certain financial covenants, including the delivery of financial and other information, limitations on cash balances outside the United States, and meeting certain . The Company was in compliance with all covenants at December 31, 2015 and December 31, 2014.

Geographic Data

Geographic Data	12 Months Ended
	Dec. 31, 2015
Segment Reporting [Abstract]
Geographic Data	7. Geographic Data As more fully described in the Company’s Summary of Significant Accounting Policies, the Company operates in one operating segment. Revenue and long-lived assets by geographic region, based on physical location of the operations recording the sale or the assets are as follows: Revenues by geographical region: Year Ended December 31, 2015 2014 2013 (In thousands) Americas $ 154,625 $ 103,356 $ 74,437 Europe 23,487 12,270 3,197 Asia Pacific 3,831 250 — Total $ 181,943 $ 115,876 $ 77,634 Percentage of revenues generated outside of the United States 15 % 11 % 4 % Total long-lived assets by geographical region: As of December 31, 2015 As of December 31, 2014 (In thousands) Americas $ 15,108 $ 10,711 Europe 1,885 670 Asia Pacific 1,168 — Total long lived assets $ 18,161 $ 11,381 Percentage of long lived assets held outside of the United States 17 % 6 %

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2015
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	8. Commitments and Contingencies The Company leases its office facilities under non-cancelable operating leases that expire at various dates through October 2027. Rent expense for non-cancellable operating leases with free rental periods or scheduled rent increases is recognized on a straight-line basis over the terms of the leases. Certain leases contain optional termination dates. The table below only includes payments up to the optional termination date. If the Company were to extended leases beyond the optional termination date the future commitments would increase by approximately $12.7 million. Improvement reimbursements from landlords of $3.7 million are being amortized on a straight-line basis into rent expense over the terms of the leases. The difference between required lease payments and rent expense has been recorded as deferred rent. Rent expense was $7.4 million in 2015, $4.9 million in 2014, and $3.1 million in 2013. Deferred rent was $6.4 million as of December 31, 2015 and $4.3 million as of December 31, 2014. In April 2015, the Company entered into a new 10 year property lease. The lease commences on January 1, 2016 and the Company will pay an aggregate of approximately $37 million in rent over the 10 year lease period. In September 2015, the Company entered into a 5 year property lease. The lease commenced on October 1, 2015 and the Company will pay an aggregate of approximately $1.3 million in rent over the 5 year lease period. In November 2015, the Company entered into a 20 year property lease, with the option to break the term at 10 years and 6 months. The lease will become effective once certain landlord work in the building has been completed and the Company will pay an aggregate of approximately $14 million in rent over the 10 years and 6 months term. In December 2015, the Company amended an existing lease and expanded the leased premises. The amended lease provides for additional rentable square feet when the term of the existing tenants expire. The amended lease commenced on November 1, 2015 and will expire on October 31, 2027. The Company will pay an aggregate of approximately $72 million in rent over the lease period. In December 2015, the Company entered into a 3 year property lease. The lease commences on April 14, 2016 and the Company will pay an aggregate of approximately $1.7 million in rent over the 3 year lease period. The Company has additional existing property leases that will require the Company to pay an aggregate of approximately $2.4 million in rent over the lease periods. These leases expire at various dates through 2020. Future minimum payments under all operating and capital lease agreements as of December 31, 2015, are as follows: Operating Capital (in thousands) 2016 $ 9,091 $ 561 2017 10,687 287 2018 10,579 — 2019 10,345 — 2020 10,513 — Thereafter 77,373 — Total $ 128,588 848 Less: Portion representing interest (29 ) Capital lease obligation $ 819 Additionally, in May 2015, the Company entered into a renewal agreement with a customer relationship management vendor. The Company’s contractual obligation under this agreement is approximately $30 million, payable over the sixty-month term of the agreement. Additionally, in December 2015, the Company entered into a renewal agreement with a web-hosting vendor. The Company’s contractual obligation under this agreement is approximately $32 million, payable over the three-year term of the agreement. Legal Contingencies From time to time the Company may become involved in legal proceedings or be subject to claims arising in the ordinary course of its business. Although the results of litigation and claims cannot be predicted with certainty, the Company currently believes that the final outcome of these ordinary course matters will not have a material adverse effect on its business, operating results, financial condition or cash flows. Regardless of the outcome, litigation can have an adverse impact on the Company because of defense and settlement costs, diversion of management resources and other factors.

Changes in Accumulated Other Co

Changes in Accumulated Other Comprehensive Loss	12 Months Ended
	Dec. 31, 2015
Equity [Abstract]
Changes in Accumulated Other Comprehensive Loss	9. Changes in Accumulated Other Comprehensive Loss The following table summarizes the changes in accumulated other comprehensive loss, which is reported as a component of stockholders’ equity, for the years ended December 31, 2015 and 2014: Cumulative Translation Adjustment Unrealized L on Investments Total (in thousands) Beginning balance at January 1, 2014 $ (79 ) $ — $ (79 ) Other comprehensive loss before reclassifications (66 ) — (66 ) Amounts reclassified from accumulated other comprehensive income — — — Ending balance at December 31, 2014 $ (145 ) $ — $ (145 ) Other comprehensive loss before reclassifications (272 ) (388 ) (660 ) Amounts reclassified from accumulated other comprehensive income — — — Ending balance at December 31, 2015 $ (417 ) $ (388 ) $ (805 )

Stockholders' Equity and Stock-

Stockholders' Equity and Stock-Based Compensation	12 Months Ended
	Dec. 31, 2015
Stockholders Equity And Stock Based Compensation [Abstract]
Stockholders' Equity and Stock-Based Compensation	10. Stockholders’ Equity and Stock-Based Compensation Upon the closing of the IPO on October 15, 2014, all outstanding convertible preferred stock was converted into 19,529,713 shares of common stock on a one-to-three basis. No convertible preferred stock was outstanding as of December 31, 2015 or December 31, 2014. Common Stock Reserved —As of December 31, 2015 and 2014, the Company has authorized 500 million shares of common stock. The number of shares of common stock reserved for the vesting of RSUs, exercise of common stock options and exercise of a warrant are as follows (in thousands): December 31, 2015 December 31, 2014 Common stock warrant — 13 Restricted stock units 1,703 1,376 Common stock options 3,331 4,588 5,034 5,977 Equity Incentive Plan —The Company’s 2007 Equity Incentive Plan (the “2007 Plan”) was terminated in connection with the IPO, and accordingly, no shares are available for issuance under the 2007 Plan. The 2007 Plan will continue to govern outstanding awards granted thereunder, The 2007 Plan provided for the grant of qualified incentive stock options and nonqualified stock options or other awards such as RSUs to the Company’s employees, officers, directors and outside consultants. The term of each option is fixed by our compensation committee and may not exceed 10 years from the date of grant. As of December 31, 2015, 2.9 million options to purchase common stock and 479 thousand RSUs remained outstanding under the 2007 Plan. On September 25, 2014, the Company’s board of directors adopted and the Company’s stockholders approved the 2014 Stock Option and Incentive Plan (the “2014 Plan”). The 2014 Plan became effective upon the closing of the Company’s IPO. The Company initially reserved 1,973,551 shares of its common stock, or the Initial Limit, for the issuance of awards under the 2014 Plan. The 2014 Plan provides that the number of shares reserved and available for issuance under the plan automatically increases each January 1, beginning on January 1, 2015, by 5% of the outstanding number of shares of the Company’s common stock on the immediately preceding December 31 or such lesser number of shares as determined by the compensation committee. This number is subject to adjustment in the event of a stock split, stock dividend or other change in the Company’s capitalization. The term of each option is fixed by our compensation committee and may not exceed 10 years from the date of grant. As of December 31, 2015, 397 thousand options to purchase common stock and 1.2 million RSUs remained outstanding under the 2014 Plan. Equity Compensation Expense —The Company’s equity compensation expense is comprised of awards of options to purchase common stock, restricted stock awards (RSAs), RSUs, and shares obtained through the Company’s Employee Stock Purchase Plan (“ESPP”). The following two tables show stock compensation expense by award type and where the stock compensation expense is recorded in the Company’s consolidated statements of operations: Year Ended December 31, 2015 2014 2013 ( in thousands) Options $ 6,349 $ 5,128 $ 3,080 Vesting of RSAs — — 384 ESPP 1,035 — — RSUs 13,924 11,230 — Total stock-based compensation $ 21,308 $ 16,358 $ 3,464 2015 2014 2013 (in thousands) Cost of revenue, subscription $ 341 $ 128 $ 50 Cost of revenue, service 1,216 498 211 Research and development 6,327 6,190 691 Sales and marketing 7,658 5,596 1,194 General and administrative 5,766 3,946 1,318 Total stock-based compensation $ 21,308 $ 16,358 $ 3,464 Excluded from stock-based compensation expense is $492 thousand of capitalized software development costs in 2015, $235 thousand in 2014, and $273 thousand in 2013. Stock Options —The fair value of employee options is estimated on the date of each grant using the Black-Scholes option-pricing model with the following assumptions: Year Ended December 31, 2015 2014 2013 Risk-free interest rate 1.36% - 1.53% 1.79% - 2.67% 0.82% - 1.86% Expected term (in years) 6.18 - 6.22 5.0 - 6.5 4.6 - 6.5 Volatility 43.0% - 51.6% 44.8% - 50.9% 46.8% - 54.7% Expected dividends — — — The weighted-average grant-date fair value of options granted was $16.53 per share in 2015, $9.72 per share in 2014, and $6.84 per share in 2013. The interest rate was based on the U.S. Treasury bond rate at the date of grant with a maturity approximately equal to the expected term. The expected term of options granted to employees was calculated using the simplified method, which represents the average of the contractual term of the option and the weighted-average vesting period of the option. The expected term of options granted to nonemployees is equal to the remaining contractual term as of the measurement date. Expected volatility for the Company’s common stock was based on an average of the historical volatility of a peer group of similar public companies. The assumed dividend yield is based upon the Company’s expectation of not paying dividends in the foreseeable future. The estimation of share-based awards that will ultimately vest requires judgment, and to the extent actual results differ from the Company’s estimates, such amounts will be recorded as an adjustment in the period estimates are revised. Prior to the Company’s IPO, the fair value of the common stock was determined by the Board of Directors at each award grant date based upon a variety of factors, including the results obtained from independent third-party valuations, the Company’s financial position and historical financial performance, the status of technological developments within the Company’s products, the composition and ability of the engineering and management team, an evaluation of benchmark of the Company’s competition, the climate in the marketplace, the illiquid nature of the common stock, arm’s-length sales of the Company’s capital stock (including redeemable convertible preferred stock), the effect of the rights and preferences of the preferred stockholders and the prospects of a liquidity event, among others. After the Company’s IPO, the fair value of the Company’s common stock is the closing price of the stock on the date of grant. The stock option activity for the year ended December 31, 2015 is as follows: Options (in thousands) Weighted- Average Exercise Price Weighted- Average Remaining Life (in years) Aggregate Intrinsic Value (in thousands) Outstanding—January 1, 2015 4,588 $ 9.64 7.6 $ 110,396 Granted 318 34.51 Exercised (1,334 ) 7.53 Forfeited/expired (241 ) 18.73 Outstanding—December 31, 2015 3,331 12.18 6.9 $ 146,994 Options vested or expected to vest—December 31, 2015 3,202 $ 11.80 6.9 $ 142,552 Options exercisable—December 31, 2015 2,174 $ 7.97 6.3 $ 104,844 Total unrecognized compensation cost related to the nonvested options granted under the 2007 Plan and the 2014 Plan was $8.2 million at December 31, 2015. That cost is expected to be recognized over a weighted-average period of 2.4 years as of December 31, 2015. Common Stock Warrant —In 2012, in conjunction with the Loan Agreement, the Company issued a warrant to purchase 13 thousand shares of common stock at an exercise price of $5.70 per share with an expiration date of April 2022. The warrant was exercised in 2015. Restricted Stock Units —RSUs vest upon achievement of a service condition and a performance condition. As soon as practicable following each vesting date, the Company will issue to the holder of the RSUs the number of shares of common stock equal to the aggregate number of RSUs that have vested. Notwithstanding the foregoing, the Company may, in its sole discretion, in lieu of issuing shares of common stock to the holder of the RSUs, pay the holder an amount in cash equal to the fair market value of such shares of common stock. The service condition is a time-based condition met over a period of four years, with 25% met after one year, and then in equal monthly installments over the succeeding three years. The performance condition is met upon a sale event or six months following the Company’s IPO, which was not considered probable as of December 31, 2013 and therefore no stock-based compensation expense was recorded in the consolidated financial statements as of that date. Upon completion of the Company’s IPO the Company began recording stock-based compensation expense based on the grant-date fair value of the RSUs using the accelerated attribution method for RSUs granted prior to its IPO and using the straight-line method for RSUs granted following its IPO, net of estimated forfeitures. The stock compensation expense associated with RSUs where the service condition had been met prior to the IPO was also recognized on the date of the IPO, using the accelerated attribution method. The total stock-based compensation expense expected to be recorded over the remaining life of outstanding RSUs is approximately $36.3 million at December 31, 2015. That cost is expected to be recognized over a weighted-average period of 3.3 years as of December 31, 2015. As of December 31, 2015 there are 1.5 million RSUs expected to vest with an aggregate intrinsic value of $82.5 million. The total fair value of RSUs vested was approximately $11.9 million in the year ended December 31, 2015. No RSUs vested in years ended December 31, 2014 and 2013. The following table summarizes the activity related to RSUs for the year ended December 31, 2015: RSUs Outstanding Shares (in thousands) Weighted- Average Grant Date Fair Value Per Share Unvested and outstanding at January 1, 2015 1,376 $ 17.40 Granted 1,284 $ 40.69 Vested (752 ) $ 15.83 Canceled (205 ) $ 25.83 Unvested and outstanding at December 31, 2015 1,703 $ 34.64

Employee Stock Purchase Plan

Employee Stock Purchase Plan	12 Months Ended
	Dec. 31, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Employee Stock Purchase Plan	11. Employee Stock Purchase Plan On September 25, 2014, the Company’s board of directors adopted and the Company’s stockholders approved the 2014 Employee Share Purchase Plan (the “2014 ESPP”). The 2014 ESPP became effective upon the closing of the Company’s IPO. The 2014 ESPP authorizes the issuance of up to a total of 709,017 shares of common stock to participating employees, and allows eligible employees to purchase shares of common stock at a 15% discount from the fair market value of the stock as determined on specific dates at six-month intervals. The offering periods generally start on the first trading day on or after January 1st and July 1st of each year. During the year ended December 31, 2015, the Company issued 29 thousand shares under the 2014 ESPP, with a weighted average purchase price per share of $28.46. Total cash proceeds from the purchase of shares under the 2014 ESPP in 2015 was $814 thousand.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	12. Income Taxes Loss before provision for income taxes was as follows: Year Ended December 31, 2015 2014 2013 (in thousands) United States $ (47,911 ) $ (49,634 ) $ (34,393 ) Foreign 2,270 1,313 119 Total $ (45,641 ) $ (48,321 ) $ (34,274 ) The (provision) benefit for income taxes consists of the following: Year Ended December 31, 2015 2014 2013 (in thousands) Current income tax provision Federal $ — $ — $ — State (61 ) (20 ) — Foreign (401 ) (12 ) — Total current income tax provision (462 ) (32 ) — Deferred income tax (provision) benefit Federal (10 ) — — State — — — Foreign 60 124 — Total deferred income tax (provision) benefit 50 124 — Total income tax (provision) benefit $ (412 ) $ 92 $ The following reconciles the differences between income taxes computed at the federal statutory rate of 35% and the provision for income taxes: Year Ended December 31, 2015 2014 2013 (in thousands) Expected income tax benefit at the federal statutory rate $ 15,974 $ 16,913 $ 11,997 State taxes net of federal benefit 2,257 1,709 1,197 Stock-based compensation (1,685 ) (886 ) (830 ) Difference in foreign tax rates 482 289 27 U.S. tax credits 2,738 1,331 444 Change in valuation allowance (19,421 ) (18,719 ) (12,367 ) Other (757 ) (545 ) (468 ) Income tax (provision) benefit $ (412 ) $ 92 $ — Deferred Tax Assets and Liabilities —Deferred income taxes reflect the net effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. Significant components of the Company’s deferred tax assets and liabilities were as follows: Year Ended December 31, 2015 2014 (in thousands) Deferred tax assets: Net operating loss carryforwards $ 60,188 $ 46,615 Research and investment credits 5,040 2,334 Accruals and reserves 5,788 3,423 Depreciation 579 372 Intangible assets 223 — Stock-based compensation 6,901 5,409 Total deferred tax assets $ 78,719 $ 58,153 Deferred tax liabilities: Capitalized costs (3,916 ) (2,808 ) Total deferred tax liabilities (3,916 ) (2,808 ) Valuation allowance (74,642 ) (55,221 ) Net deferred tax assets $ 161 $ 124 The Company reviews all available evidence to evaluate its recovery of deferred tax assets, including its recent history of accumulated losses in all tax jurisdictions over the most recent three years as well as its ability to generate income in future periods. The Company has provided a valuation allowance against its U.S. net deferred tax assets as it is more likely than not that these assets will not be realized given the nature of the assets and the likelihood of future utilization. The valuation allowance increased by $19.4 million in 2015 and $16.8 million in 2014, and due to the increase in the deferred tax assets by approximately the same amounts (primarily due to the increase in the net operating loss carryforwards). The Company does not expect any significant changes in its valuation allowance within the next 12 months. U.S. income taxes on the undistributed earnings of the Company’s three non-U.S. subsidiaries have not been provided for as the Company currently plans to indefinitely reinvest these amounts and has the ability to do so. Cumulative undistributed foreign earnings were not material at December 31, 2015 and December 31, 2014. The Company does not believe it is practicable to estimate with reasonable accuracy the hypothetical amount of the unrecognized deferred tax liability on undistributed foreign earnings given the many factors and assumptions required to estimate the taxable amount after reduction for available foreign tax credits. The Company had federal and state net operating loss carryforwards of $212.2 million and $137.3 million, respectively at December 31, 2015, which expire at various dates through 2035. The Company has generated net operating loss carryforwards from stock compensation deductions and the amount of federal and state excess tax benefits totaling $21.1 million (net of tax) will be credited to additional paid-in capital when realized. The Company had federal research and development credit carryforwards of $3.3 million and foreign tax credits of $100 thousand at December 31, 2015 that expire at various dates through 2035. The Company also has state research and investment credit carryforwards of $2.2 million and $246 thousand, respectively that expire at various dates through 2035. Under Section 382 of the Internal Revenue Code of 1986, as amended, substantial changes in the Company's ownership may limit the amount of net operating loss carryforwards that could be utilized annually in the future to offset taxable income. Specifically, this limitation may arise in the event of a cumulative change in ownership of the Company of more than 50% within a three-year period. Any such annual limitation may significantly reduce the utilization of net operating loss carryforwards before they expire. The Company performed an analysis as of December 31, 2015, and determined any potential ownership change under Section 382 during the year would not have a material impact on the future utilization of US net operating losses and tax credits. However, future transactions in the Company's common stock could trigger an ownership change for purposes of Section 382, which could limit the amount of net operating loss carryforwards and other attributes that could be utilized annually in the future to offset taxable income, if any. Any such limitation, whether as the result of sales of common stock by our existing stockholders or sales of common stock by the Company, could have a material adverse effect on results of operations in future years. In December 2015, U.S. legislation was enacted to permanently reinstate the federal Research & Development tax credit (R&D tax credit) which had expired on December 31, 2014. The Company increased its U.S. net deferred tax assets and related valuation allowance by $876 thousand for 2015 federal research credit. Uncertain Tax Positions —The Company accounts for uncertainty in income taxes using a two-step process. The Company first determines whether it is more likely than not that a tax position will be sustained upon examination by the tax authority, including resolutions of any related appeals or litigation processes, based on technical merit. If a tax position meets the more-likely-than-not recognition threshold it is then measured to determine the amount of benefit to recognize in the financial statements. The tax position is measured as the largest amount of benefit that is greater than 50% likely of being realized upon ultimate settlement. The following summarizes activity related to unrecognized tax benefits: Year Ended December 31, 2015 2014 2013 (in thousands) Unrecognized benefit—beginning of the year $ 1,713 $ 1,030 $ 667 Gross increases—current period positions 171 683 363 Gross decrease—prior period positions (1,211 ) — — Unrecognized benefit—end of period $ 673 $ 1,713 $ 1,030 All of the gross unrecognized tax benefits represent a reduction to the research and development tax credit carryforward. The gross decrease to prior period positions is a result of the Company completing IRS documentation of all credits generated since inception. All of the unrecognized tax benefits decrease deferred tax assets with a corresponding decrease to the valuation allowance. None of the unrecognized tax benefits would affect the Company’s effective tax rate if recognized in the future. The Company has elected to recognize interest and penalties related to uncertain tax positions as a component of income tax expense. No interest or penalties have been recorded through December 31, 2015. The Company does not expect any significant change in its unrecognized tax benefits within the next 12 months. The Company files tax returns in the United States, Ireland, Australia, Singapore and various state jurisdictions. All of the Company’s tax years remain open to examination by major taxing jurisdictions to which the Company is subject, as carryforward attributes generated in past years may still be adjusted upon examination by the Internal Revenue Service or state and foreign tax authorities if they have or will be used in future periods. The Company is routinely examined by various taxing authorities. The IRS announced a federal income tax audit for the tax year 2013 in the fourth quarter of 2015. The current federal income tax audit is ongoing and is expected to be completed in 2016

Employee Benefit Plan

Employee Benefit Plan	12 Months Ended
	Dec. 31, 2015
Compensation And Retirement Disclosure [Abstract]
Employee Benefit Plan	13. Employee Benefit Plan In July 2008, the Company established a defined contribution savings plan under Section 401(k) of the Internal Revenue Code. This plan covers substantially all employees who meet minimum age and service requirements and allows participants to defer a portion of their annual compensation on a pretax basis, subject to legal limitations. Total contributions were $1.2 million in 2015, $549 thousand in 2014, and $366 thousand in 2013.

Quarterly Financial Results (un

Quarterly Financial Results (unaudited)	12 Months Ended
	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Results (unaudited)	14. Quarterly Financial Results (unaudited) Fourth Quarter Third Quarter Second Quarter First Quarter (in thousands, except per share amounts) Year ended December 31, 2015 Revenue $ 53,126 $ 47,711 $ 42,941 $ 38,166 Cost of revenue 13,707 12,478 11,273 10,465 Gross profit 39,419 35,233 31,668 27,701 Net loss (10,252 ) (13,552 ) (11,392 ) (10,858 ) Net loss attributable to common stockholders (10,252 ) (13,552 ) (11,392 ) (10,858 ) Basic and diluted net loss attributable to common stockholders per share $ (0.30 ) $ (0.40 ) $ (0.34 ) $ (0.34 ) Year ended December 31, 2014 Revenue $ 34,157 $ 30,448 $ 27,098 $ 24,174 Cost of revenue 9,929 9,205 8,282 7,664 Gross profit 24,228 21,243 18,816 16,510 Net loss (19,697 ) (10,793 ) (8,279 ) (9,465 ) Net loss attributable to common stockholders (19,988 ) (10,806 ) (8,292 ) (9,477 ) Basic and diluted net loss attributable to common stockholders per share $ (0.69 ) $ (1.84 ) $ (1.44 ) $ (1.73 )

Summary of Significant Accoun24

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation —The consolidated financial statements have been prepared in U.S. dollars, in accordance with accounting principles generally accepted in the United States of America (“GAAP”). The accompanying consolidated financial statements include the accounts of the Company and its wholly owned subsidiary. All intercompany transactions have been eliminated in consolidation.
Use of Estimates	Use of Estimates —The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from those estimates.
Operating Segments	Operating Segments — The Company operates as one operating segment. Operating segments are defined as components of an enterprise for which separate financial information is regularly evaluated by the chief operating decision makers (“CODMs”), which are the Company’s chief executive officer and chief operating officer, in deciding how to allocate resources and assess performance. The Company’s CODMs evaluate the Company’s financial information and resources and assess the performance of these resources on a consolidated basis. Since the Company operates in one operating segment, all required financial segment information can be found in the consolidated financial statements.
Historical Loss Per Share	Loss Per Share — Basic net loss attributable to common stockholders per share is computed by dividing net loss attributable to common stockholders by the weighted average number of common shares outstanding for the period. Diluted net loss attributable to common stockholders per share is computed by giving effect to all potential dilutive common stock equivalents outstanding for the period. For purposes of this calculation, options to purchase common stock, common stock warrants, restricted stock units (“RSUs”) and redeemable convertible preferred stock are considered to be potential common stock equivalents. The Company applied the two-class method to calculate its basic and diluted net loss per share of common stock for the year ended December 31, 2013, as its convertible preferred stock and common stock are participating securities. The two-class method is an earnings allocation formula that treats a participating security as having rights to earnings that otherwise would have been available to common stockholders. However, the two-class method does not impact the net loss per share of common stock as the Company was in a loss position for the year ended December 31, 2013 and preferred stockholders did not participate in losses. A reconciliation of the denominator used in the calculation of basic and diluted loss per share is as follows: Year Ended December 31, 2015 2014 2013 (in thousands, except per share amounts) Numerator: Net loss attributable to common stockholders $ (46,053 ) $ (48,560 ) $ (34,328 ) Denominator: Weighted-average common shares outstanding—basic 33,222 11,562 5,113 Dilutive effect of share equivalents resulting from stock options, RSUs, common stock warrant and redeemable convertible preferred shares (as converted) — — — Weighted-average common shares outstanding-diluted 33,222 11,562 5,113 Net loss per common share, basic and diluted $ (1.39 ) $ (4.20 ) $ (6.71 ) Additionally, since the Company incurred net losses for the years ended December 31, 2015, 2014 and 2013, diluted net loss attributable to common stockholders per share is the same as basic net loss attributable to common stockholders. The Company’s outstanding stock options, common stock warrant, redeemable convertible preferred stock, and RSUs are not included in the calculation of diluted loss per share as the effect would be anti-dilutive. The following table contains share totals with a potentially dilutive impact: Year Ended December 31, 2015 2014 2013 (in thousands) Options to purchase common shares 3,331 4,588 4,695 Common stock warrant — 13 13 Convertible preferred shares (as converted) — — 19,530 RSUs 1,703 1,376 858
Cash and Cash Equivalents	Cash and Cash Equivalents — The Company considers all highly liquid investments purchased with original maturity of three months or less to be cash equivalents. Cash and cash equivalents consist of cash held in bank deposit accounts and short-term, highly-liquid investments with remaining maturities of three months or less at the date of purchase, consisting of money-market funds.
Investments	Investments — Investments consist of corporate debt securities and U.S. government agency obligations. Securities having remaining maturities of more than three months at the date of purchase and less than one year from the date of the balance sheets are classified as short-term, and those with maturities of more than one year from the date of the balance sheet are classified as long-term in the consolidated balance sheets. The Company classifies its debt investments with readily determinable market values as available-for-sale. These investments are classified as investments on the consolidated balance sheets and are carried at fair market value, with unrealized gains and losses considered to be temporary in nature reported as accumulated other comprehensive loss, a separate component of stockholders’ equity. The Company reviews all investments for reductions in fair value that are other-than-temporary. When such reductions occur, the cost of the investment is adjusted to fair value through recording a loss on investments in the consolidated statements of operations. Gains and losses on investments are calculated on the basis of specific identification. Investments are considered to be impaired when a decline in fair value below cost basis is determined to be other-than-temporary. The Company periodically evaluates whether a decline in fair value below cost basis is other-than-temporary by considering available evidence regarding these investments including, among other factors: the duration of the period that, and extent to which, the fair value is less than cost basis; the financial health of, and business outlook for the issuer, including industry and sector performance and operational and financing cash flow factors; overall market conditions and trends and the Company’s intent and ability to retain its investment in the security for a period of time sufficient to allow for an anticipated recovery in market value. Once a decline in fair value is determined to be other-than-temporary, a write-down is recorded and a new cost basis in the security is established.
Accounts Receivable and Allowance for Doubtful Accounts	Accounts Receivable and Allowance for Doubtful Accounts —Accounts receivable are carried at the original invoiced amount less an allowance for doubtful accounts based on the probability of future collection. When management becomes aware of circumstances that may decrease the likelihood of collection, it records a specific allowance against amounts due, which reduces the receivable to the amount that management reasonably believes will be collected. For all other customers, management determines the adequacy of the allowance based on historical loss patterns, the number of days that billings are past due and an evaluation of the potential risk of loss associated with specific accounts. To date, losses resulting from uncollected receivables have not exceeded management’s expectations. The following is a rollforward of the Company’s allowance for doubtful accounts (in thousands): Balance Beginning of Period Charged to Statement of Operations Deductions (1) Balance at End of Period Allowance for doubtful accounts Year ended December 31, 2015 $ 218 $ 1,367 $ (1,214 ) $ 371 Year ended December 31, 2014 $ 175 $ 632 $ (589 ) $ 218 Year ended December 31, 2013 $ 122 $ 523 $ (470 ) $ 175 (1) Deductions include actual accounts written-off, net of recoveries.
Restricted Cash	Restricted Cash — The Company had restricted cash of $363 thousand at December 31, 2015 and $230 thousand at December 31, 2014 related to landlord guarantees for leased facilities.
Property and Equipment	Property and Equipment —Property and equipment are stated at cost and depreciated using the straight-line method over the estimated useful lives of the related assets. Expenditures for maintenance and repairs are charged to expense as incurred, whereas major betterments are capitalized as additions to leasehold improvements. Depreciation is recorded over the following estimated useful lives: Estimated Useful Life Employee related computer equipment 2 years Computer equipment and purchased software 3 years Office equipment 5 years Furniture and fixtures 5 years Leasehold improvements Lesser of lease
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets — Long-lived assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of the asset may not be recoverable or that the useful lives of those assets are no longer appropriate. Management considers the following potential indicators of impairment of its long-lived assets (asset group): a substantial decrease in the Company’s stock price, a significant adverse change in the extent or manner in which a long-lived asset (asset group) is being used, a significant adverse change in legal factors or in the business climate that could affect the value of the long-lived asset (asset group), an accumulation of costs significantly in excess of the amount originally expected for the acquisition or construction of a long-lived asset (asset group), and a current expectation that, more likely than not, a long lived asset (asset group) will be sold or otherwise disposed of significantly before the end of its previously estimated useful life. When such events occur, the Company compares the carrying amounts of the assets to their undiscounted expected future cash flows. If this comparison indicates that there may be an impairment, the amount of the impairment is calculated as the difference between the carrying value and fair value. For the years presented, the Company did not recognize an impairment charge.
Goodwill	Goodwill — Goodwill represents the excess of cost over the fair value of the net tangible and identifiable intangible assets acquired in a business combination. The Company has no other intangible assets with indefinite useful lives. Goodwill is not subject to amortization, but is monitored annually for impairment or more frequently if there are indicators of impairment. Management considers the following potential indicators of impairment: significant underperformance relative to historical or projected future operating results, significant changes in the Company’s use of acquired assets or the strategy of the Company’s overall business, significant negative industry or economic trends and a significant decline in the Company’s stock price for a sustained period. The Company performs its annual impairment test on November 30. Currently, the Company’s goodwill is evaluated at the entity level as it is determined there is only one reporting unit. The Company performs a two-step impairment test. In the first step, the fair value of each reporting unit is compared to its carrying amount. If the fair value exceeds the carrying value of the net assets assigned, goodwill is not considered impaired and the second step is not required. If the carrying value exceeds the fair value, then the second step of the impairment test is performed in order to determine the implied fair value of the reporting unit’s goodwill. If the carrying value of the goodwill exceeds the fair value, then an impairment charge is recorded. On November 30, 2015 the fair value of the Company’s single reporting unit exceeded its carrying amount. Because the fair value of the Company’s single reporting unit was in excess of its carrying value and there were no indicators that the Company’s goodwill had become impaired since that date, there was no impairment as of November 30, 2015 through December 31, 2015. For the years ended December 31, 2015, 2014 and 2013, the Company did not recognize an impairment charge.
Advertising Expense	Advertising Expense — The Company expenses advertising as incurred, which is included in sales and marketing expense in the accompanying consolidated statements of operations. The Company incurred $4.9 million of advertising expense in 2015, $3.3 million in 2014, and $3.5 million in 2013.
Revenue Recognition	Revenue Recognition —The Company primarily generates revenue from multi ple-element arrangements, which typically include subscriptions to its online software solution and professional services which includes on-boarding and training services. The Company’s customers do not have the right to take possession of the online software solution. The Company recognizes revenue when all of the following have occurred: · persuasive evidence of an arrangement with the customer exists; · service has been or is being provided; · the fees are fixed or determinable; and · collectability of the fees is reasonably assured. The Company’s arrangements do not contain general rights of return. In order to treat elements in a multiple-element arrangement as separate units of accounting, the delivered elements must have standalone value and delivery of the undelivered element is probable and within control of the Company. The Company has determined that subscriptions for its online software solution have standalone value because, once a customer launches its initial site, the online software solution is fully functional and does not require any additional development, modification, or customization. Professional services consists primarily of on-boarding and web-based and in-person training, are not required to use the online software solution, and are determined to have stand-alone value from the related subscription services because they are sold separately by the Company and third parties. When multiple-element arrangements are separated into different units of accounting, the arrangement consideration is allocated to the identified separate units based on a relative selling price hierarchy. The estimated fair value of each element is determined based upon the following hierarchy: (1) vendor specific objective evidence (“VSOE”) of fair value, (2) third party evidence of selling price (“TPE”), or (3) the Company’s best estimate of selling price (“BESP”). The Company is not able to establish VSOE of fair value for undelivered elements, which in most instances is subscription and training and professional services, based on its pricing practices, and there is not a reliable measure of TPE of selling price. As such, arrangement consideration is allocated amongst multiple deliverable arrangements using BESP. The Company establishes BESP for each deliverable primarily considering the median of actual sales prices of each type of subscription and other professional services sold. The Company considers each type of subscription and service as well as pricing and geographic information when establishing BESP. Arrangement consideration is allocated such that the revenue recognized does not exceed the fee subject to refund. Revenue from subscriptions is recognized ratably over the subscription period beginning on the date the Company’s subscription is made available to customers. Substantially all subscription contracts are one year or less. The Company recognizes revenue from on-boarding and training services as the services are provided. The Company pays its marketing agency partners a commission of the subscription sales price for sales to customers. The classification of the commission paid on the Company’s consolidated statements of operations depends on who is purchasing its subscription. In instances where the customer is purchasing the subscription, the Company is the primary obligor and records the commission paid to the agency partner as sales and marketing expense. When the agency partner purchases the subscription directly from the Company, the Company nets the consideration paid to the partner against the associated revenue it recognizes, as in these instances the Company’s customer is the partner and the Company’s remaining obligations are to the partner. The Company does not believe that it receives a tangible benefit from the payment back to the partner. The Company has $4.9 million accrued for partner commissions at December 31, 2015 and $2.8 million accrued for partner commissions at December 31, 2014. These amounts are included within other accrued expenses on the balance sheets. Sales taxes collected from customers and remitted to government authorities are excluded from revenue. Amounts that have been invoiced are recorded in accounts receivable and deferred revenue or revenue, depending on whether the revenue recognition criteria have been met. Deferred revenue represents amounts billed for which revenue has not yet been recognized. Deferred revenue that will be recognized during the succeeding 12-month period is recorded as current deferred revenue and the remaining portion is recorded as long-term deferred revenue.
Concentrations of Credit Risk and Significant Customers	Concentrations of Credit Risk and Significant Customers —Financial instruments that potentially expose the Company to concentrations of credit risk consist primarily of cash, investments and accounts receivable. A significant portion of the Company’s cash and cash equivalents is held at one financial institution that management believes to be of high credit quality. Although the Company deposits it cash and cash equivalents with multiple financial institutions, its deposits exceed federally insured limits. The Company’s investments consist of highly rated corporate debt securities and U.S. government agency obligations . The Company limits the amount of investments in any single issuer. The Company believes that, as of December 31, 2015, its concentration of credit risk related to investments was not significant. The Company has no significant off-balance sheet risk such as foreign exchange contracts, option contracts, or other hedging arrangements. The Company generally does not require collateral from its customers and generally requires payment 30 days from the invoice date. The Company maintains an allowance for doubtful accounts based on its assessment of the collectability of accounts receivable. Credit risk arising from accounts receivable is mitigated as a result of transacting with a large number of geographically dispersed customers spread across various industries. At December 31, 2015 and 2014 there were no customers that represented more than 10% of the net accounts receivable balance. There were no customers that individually exceeded 10% of the Company’s revenue in any of the periods presented.
Foreign Currency	Foreign Currency —The functional currency of the Company’s foreign subsidiaries is the local currency. Assets and liabilities denominated in a foreign currency are translated into U.S. dollars at the exchange rates in effect at the balance sheet dates; with the resulting translation adjustments directly recorded to a separate component of accumulated other comprehensive loss. Income and expense accounts are translated at the weighted-average exchange rates during the period. Foreign currency transaction gains and losses are recorded in other income (expense).
Research and Development	Research and Development —Research and development expenses include payroll, employee benefits and other expenses associated with product development.
Capitalized Software Development Costs	Capitalized Software Development Costs — Certain payroll and stock compensation costs incurred to develop functionality for the Company’s software platform, as well as certain upgrades and enhancements that are expected to result in increased functionality are capitalized. The costs incurred in the preliminary stages of development are expensed as incurred. Once an application has reached the development stage, certain internal costs are capitalized until the software is substantially complete and ready for its intended use. Capitalized software development costs are amortized on a straight-line basis over their estimated useful life of two years. Management evaluates the useful lives of these assets on an annual basis and tests for impairment whenever events or changes in circumstances occur that could impact the recoverability of these assets. Capitalized software development costs consisted of the following: December 31, 2015 December 31, 2014 (in thousands) Gross capitalized software development costs $ 18,737 $ 14,219 Accumulated amortization (14,082 ) (9,786 ) Capitalized software development costs, net $ 4,655 $ 4,433 The Company capitalized software development costs of $4.5 million in 2015, $4.9 million in 2014, and $3.7 million in 2013. Stock-based compensation costs included in capitalized software were $492 thousand in 2015, $235 thousand in 2014, and $273 thousand in 2013. Amortization of capitalized software development costs was $4.6 million in 2015, $3.9 million in 2014, and $2.6 million in 2013. Amortization expense is included in cost of revenue in the consolidated statements of operations.
Income Taxes	Income Taxes —Deferred tax assets and liabilities are recognized for the differences between the financial statement carrying amounts and the tax bases of existing assets and liabilities using tax rates expected to be in effect in the years in which the differences are expected to reverse. Deferred tax assets are reduced by a valuation allowance if it is more likely than not that some portion or all of the deferred tax assets will not be realized. Accounting for uncertainty in income taxes recognized in the financial statements is in accordance with accounting authoritative guidance, which prescribes a two-step process to determine the amount of tax benefit to be recognized. First, the tax position must be evaluated to determine the likelihood that it will be sustained upon external examination. If the tax position is deemed “more-likely-than-not” to be sustained, the tax position is then assessed to determine the amount of benefit to recognize in the financial statements. The amount of the benefit that may be recognized is the largest amount that has a greater than 50 percent likelihood of being realized upon ultimate settlement. Our intention is to reinvest the total amount of our unremitted foreign earnings in the local international jurisdictions, except for instances where we can remit such earnings to the U.S. without an associated net tax cost. As a result, we do not provide for United States taxes on the unremitted earnings of our international subsidiaries.
Stock-Based Compensation	Stock-Based Compensation —The Company accounts for all stock options and awards granted to employees and nonemployees using a fair value method. Stock-based compensation is recognized as an expense and is measured at the fair value of the award. The measurement date for employee awards is generally the date of the grant. The measurement date for nonemployee awards is generally the date the awards vest. Stock-based compensation costs are recognized as expense over the requisite service period, which is generally the vesting period for awards, on a straight-line basis for awards with only a service condition, and using the graded-method for awards with both a performance and service that were granted prior to our IPO, and on a straight-line basis for the awards that were granted following our IPO.
Recent Accounting Pronouncements	Recent Accounting Pronouncements — In November 2015, the Financial Accounting Standards Board (FASB) issued updated guidance that allows entities to present deferred tax assets and deferred tax liabilities as noncurrent in a classified balance sheet. The update simplifies the current guidance, which requires entities to separately present deferred tax assets and deferred tax liabilities as current and noncurrent in a classified balance sheet. The guidance is required for annual reporting periods beginning after December 15, 2016, including interim periods within the reporting period. The Company early adopted the provisions of this update during the fourth quarter of fiscal year 2015 and applied it retrospectively. Adoption of this standard did not materially impact results of operations, retained earnings, or cash flows in the current or previous interim and annual reporting periods. In September 2015, the FASB issued updated guidance related to simplifying the accounting for measurement period adjustments related to business combinations. The amended guidance eliminates the requirement to retrospectively account for adjustments made during the measurement period. The standard is effective beginning January 1, 2016, with early adoption permitted. The Company does not expect it to have a material impact on our consolidated financial position, results of operations or cash flows. In May 2014, the FASB issued updated guidance and disclosure requirements for recognizing revenue. The new revenue recognition standard provides a five-step analysis of transactions to determine when and how revenue is recognized. The core principle is that a company 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. In July 2015, the FASB approved the deferral of the new standard's effective date by one year. The new standard now is effective for annual and interim reporting periods beginning December 15, 2017. The FASB will permit companies to adopt the new standard early, but not before the original effective date of December 15, 2016. The Company is evaluating the potential impact of adopting this new accounting guidance.
Reclassifications	Reclassifications — Certain prior year amounts have been reclassified to conform with the current year’s presentation. During the year ended December 31, 2015, the Company classified $2.9 million of credit card fees associated with customer payments within general and administrative expenses on the consolidated statements of operations. Accordingly, the Company reclassified $2.0 million of credit card fees associated with customer payments for the year ended December 31, 2014 and $1.5 million of credit card fees associated with customer payments for the year ended December 31, 2013 from cost of revenues, subscription to general and administrative expenses to conform with this presentation.

Summary of Significant Accoun25

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Summary of Reconciliation of Denominator Used in Calculation of Basic and Diluted Loss Per Share	A reconciliation of the denominator used in the calculation of basic and diluted loss per share is as follows: Year Ended December 31, 2015 2014 2013 (in thousands, except per share amounts) Numerator: Net loss attributable to common stockholders $ (46,053 ) $ (48,560 ) $ (34,328 ) Denominator: Weighted-average common shares outstanding—basic 33,222 11,562 5,113 Dilutive effect of share equivalents resulting from stock options, RSUs, common stock warrant and redeemable convertible preferred shares (as converted) — — — Weighted-average common shares outstanding-diluted 33,222 11,562 5,113 Net loss per common share, basic and diluted $ (1.39 ) $ (4.20 ) $ (6.71 )
Schedule of Share Totals with Potentially Dilutive Impact	The following table contains share totals with a potentially dilutive impact: Year Ended December 31, 2015 2014 2013 (in thousands) Options to purchase common shares 3,331 4,588 4,695 Common stock warrant — 13 13 Convertible preferred shares (as converted) — — 19,530 RSUs 1,703 1,376 858
Schedule of Rollforward of Company's Allowance for Doubtful Accounts	The following is a rollforward of the Company’s allowance for doubtful accounts (in thousands): Balance Beginning of Period Charged to Statement of Operations Deductions (1) Balance at End of Period Allowance for doubtful accounts Year ended December 31, 2015 $ 218 $ 1,367 $ (1,214 ) $ 371 Year ended December 31, 2014 $ 175 $ 632 $ (589 ) $ 218 Year ended December 31, 2013 $ 122 $ 523 $ (470 ) $ 175 (1) Deductions include actual accounts written-off, net of recoveries.
Schedule of Property Plant and Equipment Useful Life	Depreciation is recorded over the following estimated useful lives: Estimated Useful Life Employee related computer equipment 2 years Computer equipment and purchased software 3 years Office equipment 5 years Furniture and fixtures 5 years Leasehold improvements Lesser of lease
Summary of Capitalized Software Development Costs	Capitalized software development costs consisted of the following: December 31, 2015 December 31, 2014 (in thousands) Gross capitalized software development costs $ 18,737 $ 14,219 Accumulated amortization (14,082 ) (9,786 ) Capitalized software development costs, net $ 4,655 $ 4,433

Fair Value of Financial Instr26

Fair Value of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Schedule of Fair Value Measurements of Financial Assets and Liabilities	The following table details the fair value measurements within the fair value hierarchy of the Company’s financial assets and liabilities at December 31, 2015 and December 31, 2014. December 31, 2015 Level 1 Level 2 Level 3 Total (in thousands) Money market funds $ 32,014 $ — $ — $ 32,014 Commercial paper — 7,711 — 7,711 Corporate bonds — 70,869 — 70,869 U.S. government agency obligations — 10,958 — 10,958 Total $ 32,014 $ 89,538 $ — $ 121,552 December 31, 2014 Level 1 Level 2 Level 3 Total (in thousands) Money market funds $ 100,000 $ — $ — $ 100,000 Total $ 100,000 $ — $ — $ 100,000
Summary of Composition of Short and Long Term Investments	The following tables summarize the composition of our short- and long-term investments at December 31, 2015. The Company did not have any investments at December 31, 2014. December 31, 2015 Amortized Cost Unrealized Gains Unrealized (Losses) Aggregate Fair Value (in thousands) Commercial paper $ 7,721 $ — $ (10 ) $ 7,711 Corporate bonds 71,207 — (338 ) 70,869 U.S. government agency obligations 10,998 — (40 ) 10,958 Total $ 89,926 $ — $ (388 ) $ 89,538
Summary of Contractual Maturities of Short and Long Term Investments	The contractual maturities of short-term and long-term investments held at December 31, 2015 are as follows: December 31, 2015 Amortized Cost Basis Aggregate Fair Value ( in thousands) Due within one year $ 49,068 $ 48,972 Due after 1 year through 2 years 40,858 40,566 Total $ 89,926 $ 89,538

Property and Equipment (Tables)

Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2015
Property Plant And Equipment [Abstract]
Schedule of Property and Equipment	Property and equipment as of December 31, 2015 and December 31, 2014 consists of the following: December 31. 2015 2014 (in thousands) Computer equipment & purchased software $ 1,237 $ 904 Employee computer equipment 307 — Furniture and fixtures 3,907 3,010 Office equipment 1,209 1,118 Leasehold improvements 17,086 10,153 Equipment under capital lease 1,409 562 Total property and equipment 25,155 15,747 Less accumulated depreciation (6,994 ) (4,366 ) Property and equipment, net $ 18,161 $ 11,381

Intangible Assets (Tables)

Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2015
Goodwill And Intangible Assets Disclosure [Abstract]
Intangible Assets	Intangible assets as of December 31, 2015 and 2014 consist of the following: Weighted Average Remaining Useful Life December 31, 2015 2014 (in thousands) Acquired technology 13 Months $ 852 $ 745 Acquired intellectual property 15 Months 80 80 Accumulated amortization (832 ) (736 ) Total $ 100 $ 89
Estimated Future Amortization Expense for Intangible Assets	Estimated future amortization expense for intangible assets as of December 31, 2015 is as follows: Years ended December 31, Amortization Expense (in thousands) 2016 $ 84 2017 16 Total $ 100

Geographic Data (Tables)

Geographic Data (Tables)	12 Months Ended
	Dec. 31, 2015
Segment Reporting [Abstract]
Revenues by Geographical Region	Revenues by geographical region: Year Ended December 31, 2015 2014 2013 (In thousands) Americas $ 154,625 $ 103,356 $ 74,437 Europe 23,487 12,270 3,197 Asia Pacific 3,831 250 — Total $ 181,943 $ 115,876 $ 77,634 Percentage of revenues generated outside of the United States 15 % 11 % 4 %
Long Lived Assets by Geographical Region	Total long-lived assets by geographical region: As of December 31, 2015 As of December 31, 2014 (In thousands) Americas $ 15,108 $ 10,711 Europe 1,885 670 Asia Pacific 1,168 — Total long lived assets $ 18,161 $ 11,381 Percentage of long lived assets held outside of the United States 17 % 6 %

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2015
Commitments And Contingencies Disclosure [Abstract]
Schedule of Future Minimum Payments	Future minimum payments under all operating and capital lease agreements as of December 31, 2015, are as follows: Operating Capital (in thousands) 2016 $ 9,091 $ 561 2017 10,687 287 2018 10,579 — 2019 10,345 — 2020 10,513 — Thereafter 77,373 — Total $ 128,588 848 Less: Portion representing interest (29 ) Capital lease obligation $ 819

Changes in Accumulated Other 31

Changes in Accumulated Other Comprehensive Loss (Tables)	12 Months Ended
	Dec. 31, 2015
Equity [Abstract]
Changes in Accumulated Other Comprehensive Loss	The following table summarizes the changes in accumulated other comprehensive loss, which is reported as a component of stockholders’ equity, for the years ended December 31, 2015 and 2014: Cumulative Translation Adjustment Unrealized L on Investments Total (in thousands) Beginning balance at January 1, 2014 $ (79 ) $ — $ (79 ) Other comprehensive loss before reclassifications (66 ) — (66 ) Amounts reclassified from accumulated other comprehensive income — — — Ending balance at December 31, 2014 $ (145 ) $ — $ (145 ) Other comprehensive loss before reclassifications (272 ) (388 ) (660 ) Amounts reclassified from accumulated other comprehensive income — — — Ending balance at December 31, 2015 $ (417 ) $ (388 ) $ (805 )

Stockholders' Equity and Stoc32

Stockholders' Equity and Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2015
Stockholders Equity And Stock Based Compensation [Abstract]
Summary of Number of Shares of Common Stock Reserved	The number of shares of common stock reserved for the vesting of RSUs, exercise of common stock options and exercise of a warrant are as follows (in thousands): December 31, 2015 December 31, 2014 Common stock warrant — 13 Restricted stock units 1,703 1,376 Common stock options 3,331 4,588 5,034 5,977
Stock Compensation Expense by Award is Recorded in the Company's Consolidated Statements of Operations	The following two tables show stock compensation expense by award type and where the stock compensation expense is recorded in the Company’s consolidated statements of operations: Year Ended December 31, 2015 2014 2013 ( in thousands) Options $ 6,349 $ 5,128 $ 3,080 Vesting of RSAs — — 384 ESPP 1,035 — — RSUs 13,924 11,230 — Total stock-based compensation $ 21,308 $ 16,358 $ 3,464
Effect of Stock-Based Compensation on Income by Line Item	The following two tables show stock compensation expense by award type and where the stock compensation expense is recorded in the Company’s consolidated statements of operations: 2015 2014 2013 (in thousands) Cost of revenue, subscription $ 341 $ 128 $ 50 Cost of revenue, service 1,216 498 211 Research and development 6,327 6,190 691 Sales and marketing 7,658 5,596 1,194 General and administrative 5,766 3,946 1,318 Total stock-based compensation $ 21,308 $ 16,358 $ 3,464
Schedule of Assumptions Used for Estimation of Fair Value of Options Granted to Employees	Stock Options —The fair value of employee options is estimated on the date of each grant using the Black-Scholes option-pricing model with the following assumptions: Year Ended December 31, 2015 2014 2013 Risk-free interest rate 1.36% - 1.53% 1.79% - 2.67% 0.82% - 1.86% Expected term (in years) 6.18 - 6.22 5.0 - 6.5 4.6 - 6.5 Volatility 43.0% - 51.6% 44.8% - 50.9% 46.8% - 54.7% Expected dividends — — —
Summary of Stock Option Activity	The stock option activity for the year ended December 31, 2015 is as follows: Options (in thousands) Weighted- Average Exercise Price Weighted- Average Remaining Life (in years) Aggregate Intrinsic Value (in thousands) Outstanding—January 1, 2015 4,588 $ 9.64 7.6 $ 110,396 Granted 318 34.51 Exercised (1,334 ) 7.53 Forfeited/expired (241 ) 18.73 Outstanding—December 31, 2015 3,331 12.18 6.9 $ 146,994 Options vested or expected to vest—December 31, 2015 3,202 $ 11.80 6.9 $ 142,552 Options exercisable—December 31, 2015 2,174 $ 7.97 6.3 $ 104,844
Summary of Activity Related to RSUs	The following table summarizes the activity related to RSUs for the year ended December 31, 2015: RSUs Outstanding Shares (in thousands) Weighted- Average Grant Date Fair Value Per Share Unvested and outstanding at January 1, 2015 1,376 $ 17.40 Granted 1,284 $ 40.69 Vested (752 ) $ 15.83 Canceled (205 ) $ 25.83 Unvested and outstanding at December 31, 2015 1,703 $ 34.64

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Schedule of Loss Before Provision for Income Taxes	Loss before provision for income taxes was as follows: Year Ended December 31, 2015 2014 2013 (in thousands) United States $ (47,911 ) $ (49,634 ) $ (34,393 ) Foreign 2,270 1,313 119 Total $ (45,641 ) $ (48,321 ) $ (34,274 )
Components of Income Tax (Provision) Benefit	The (provision) benefit for income taxes consists of the following: Year Ended December 31, 2015 2014 2013 (in thousands) Current income tax provision Federal $ — $ — $ — State (61 ) (20 ) — Foreign (401 ) (12 ) — Total current income tax provision (462 ) (32 ) — Deferred income tax (provision) benefit Federal (10 ) — — State — — — Foreign 60 124 — Total deferred income tax (provision) benefit 50 124 — Total income tax (provision) benefit $ (412 ) $ 92 $
Schedule of Differences Between Income Taxes Computed at the Federal Statutory Rate and the Provision for Income Taxes	The following reconciles the differences between income taxes computed at the federal statutory rate of 35% and the provision for income taxes: Year Ended December 31, 2015 2014 2013 (in thousands) Expected income tax benefit at the federal statutory rate $ 15,974 $ 16,913 $ 11,997 State taxes net of federal benefit 2,257 1,709 1,197 Stock-based compensation (1,685 ) (886 ) (830 ) Difference in foreign tax rates 482 289 27 U.S. tax credits 2,738 1,331 444 Change in valuation allowance (19,421 ) (18,719 ) (12,367 ) Other (757 ) (545 ) (468 ) Income tax (provision) benefit $ (412 ) $ 92 $ —
Components of the Company's Deferred Tax Assets and Liabilities	Significant components of the Company’s deferred tax assets and liabilities were as follows: Year Ended December 31, 2015 2014 (in thousands) Deferred tax assets: Net operating loss carryforwards $ 60,188 $ 46,615 Research and investment credits 5,040 2,334 Accruals and reserves 5,788 3,423 Depreciation 579 372 Intangible assets 223 — Stock-based compensation 6,901 5,409 Total deferred tax assets $ 78,719 $ 58,153 Deferred tax liabilities: Capitalized costs (3,916 ) (2,808 ) Total deferred tax liabilities (3,916 ) (2,808 ) Valuation allowance (74,642 ) (55,221 ) Net deferred tax assets $ 161 $ 124
Summary of Activity Related to Unrecognized Tax Benefits	The following summarizes activity related to unrecognized tax benefits: Year Ended December 31, 2015 2014 2013 (in thousands) Unrecognized benefit—beginning of the year $ 1,713 $ 1,030 $ 667 Gross increases—current period positions 171 683 363 Gross decrease—prior period positions (1,211 ) — — Unrecognized benefit—end of period $ 673 $ 1,713 $ 1,030

Quarterly Financial Results (34

Quarterly Financial Results (unaudited) (Tables)	12 Months Ended
	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Financial Results	Fourth Quarter Third Quarter Second Quarter First Quarter (in thousands, except per share amounts) Year ended December 31, 2015 Revenue $ 53,126 $ 47,711 $ 42,941 $ 38,166 Cost of revenue 13,707 12,478 11,273 10,465 Gross profit 39,419 35,233 31,668 27,701 Net loss (10,252 ) (13,552 ) (11,392 ) (10,858 ) Net loss attributable to common stockholders (10,252 ) (13,552 ) (11,392 ) (10,858 ) Basic and diluted net loss attributable to common stockholders per share $ (0.30 ) $ (0.40 ) $ (0.34 ) $ (0.34 ) Year ended December 31, 2014 Revenue $ 34,157 $ 30,448 $ 27,098 $ 24,174 Cost of revenue 9,929 9,205 8,282 7,664 Gross profit 24,228 21,243 18,816 16,510 Net loss (19,697 ) (10,793 ) (8,279 ) (9,465 ) Net loss attributable to common stockholders (19,988 ) (10,806 ) (8,292 ) (9,477 ) Basic and diluted net loss attributable to common stockholders per share $ (0.69 ) $ (1.84 ) $ (1.44 ) $ (1.73 )

Organization and Operations - A

Organization and Operations - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	Mar. 24, 2015	Oct. 15, 2014	Dec. 31, 2015	Dec. 31, 2014
Summary Of Organization And Operations [Line Items]
Number of shares issued to public	971,891
Issued price per share of common stock	$ 37
Aggregate proceeds from IPO		$ 133,700
Share offering expenses	$ 583
Number of preferred stock converted to common stock		19,529,713
Aggregate Proceeds From Offering	$ 34,300		$ 33,669	$ 130,764
IPO [Member]
Summary Of Organization And Operations [Line Items]
Number of shares issued to public		5,750,000
Issued price per share of common stock		$ 25
Share offering expenses		$ 3,100
Over-Allotment Option [Member]
Summary Of Organization And Operations [Line Items]
Number of shares issued to public	121,891	750,000

Summary of Significant Accoun36

Summary of Significant Accounting Policies - Additional Information (Detail)	Nov. 30, 2015USD ($)	Dec. 31, 2015USD ($)SegmentReporting_UnitCustomer	Dec. 31, 2014USD ($)Customer	Dec. 31, 2013USD ($)
Schedule Of Accounting Policies [Line Items]
Number of operating segment | Segment		1
Cash and cash equivalents, maturity description		Three months or less at the date of purchase, consisting of money-market funds.
Restricted cash		$ 363,000	$ 230,000
Impairment charges of long lived assets		0
Intangible assets with indefinite useful lives		$ 0
Number of reporting unit | Reporting_Unit		1
Goodwill impairment	$ 0	$ 0	0	$ 0
Advertising expense		$ 4,900,000	3,300,000	3,500,000
Revenue subscription contract period		One year or less
Accrued for partner commissions		$ 4,900,000	2,800,000
Off-balance sheet risk amount		$ 0
Accounts receivable payment period		30 days
Capitalized software development costs		$ 4,500,000	4,900,000	3,700,000
Stock-based compensation in capitalized software development costs		492,000	235,000	273,000
Amortization of software development costs		$ 4,600,000	3,900,000	2,600,000
Minimum percentage chances of tax benefit to be realized on examination		50.00%
General and Administrative [Member]
Schedule Of Accounting Policies [Line Items]
Amount reclassified from cost of revenues to general and administrative expenses		$ 2,900,000	$ 2,000,000	$ 1,500,000
Software Development Costs [Member]
Schedule Of Accounting Policies [Line Items]
Property and Equipment, Estimated Useful Life		2 years
Accounts Receivable [Member] | Customer Concentration Risk [Member]
Schedule Of Accounting Policies [Line Items]
Number of customers represented more than 10% | Customer		0	0
Concentration risk, percentage		10.00%	10.00%
Revenue [Member] | Customer Concentration Risk [Member]
Schedule Of Accounting Policies [Line Items]
Number of customers represented more than 10% | Customer		0	0
Concentration risk, percentage		10.00%	10.00%

Summary of Significant Accoun37

Summary of Significant Accounting Policies - Summary of Reconciliation of Denominator Used in Calculation of Basic and Diluted Loss Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Numerator:
Net loss attributable to common stockholders	$ (10,252)	$ (13,552)	$ (11,392)	$ (10,858)	$ (19,988)	$ (10,806)	$ (8,292)	$ (9,477)	$ (46,053)	$ (48,560)	$ (34,328)
Denominator:
Weighted-average common shares outstanding - basic									33,222	11,562	5,113
Dilutive effect of share equivalents resulting from stock options, RSUs, common stock warrant and redeemable convertible preferred shares (as converted)										0	0
Weighted-average common shares outstanding - diluted									33,222	11,562	5,113
Net loss per common share, basic and diluted	$ (0.30)	$ (0.40)	$ (0.34)	$ (0.34)	$ (0.69)	$ (1.84)	$ (1.44)	$ (1.73)	$ (1.39)	$ (4.20)	$ (6.71)

Summary of Significant Accoun38

Summary of Significant Accounting Policies - Schedule of Potentially Dilutive Common Stock Equivalents (Detail) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Options to Purchase Common Shares [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	3,331	4,588	4,695
Common Stock Warrant [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share		13	13
RSUs [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	1,703	1,376	858
Convertible Preferred Shares [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share			19,530

Summary of Significant Accoun39

Summary of Significant Accounting Policies - Schedule of Rollforward of Company's Allowance for Doubtful Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Receivables [Abstract]
Allowance for doubtful accounts, Beginning Balance	$ 218	$ 175	$ 122
Allowance for doubtful accounts, Charged to Statement of Operations	1,367	632	523
Allowance for doubtful accounts, Deductions	(1,214)	(589)	(470)
Allowance for doubtful accounts, Ending Balance	$ 371	$ 218	$ 175

Summary of Significant Accoun40

Summary of Significant Accounting Policies - Schedule of Property Plant and Equipment Useful Life (Detail)	12 Months Ended
	Dec. 31, 2015
Employee Related Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Estimated Useful Life	2 years
Computer Equipment and Purchased Software [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Estimated Useful Life	3 years
Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Estimated Useful Life	5 years
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Estimated Useful Life	5 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and Equipment, Estimated Useful Life, Description	Lesser of lease term or useful life

Summary of Significant Accoun41

Summary of Significant Accounting Policies - Summary of Capitalized Software Development Costs (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Capitalized Computer Software Net [Abstract]
Gross capitalized software development costs	$ 18,737	$ 14,219
Accumulated amortization	(14,082)	(9,786)
Capitalized software development costs, net	$ 4,655	$ 4,433

Fair Value of Financial Instr42

Fair Value of Financial Instruments - Schedule of Fair Value of Financial Assets and Liabilities (Detail) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of short and long term investments	$ 89,538,000	$ 0
Fair value of financial assets	121,552,000	100,000,000
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of financial assets	32,014,000	100,000,000
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of financial assets	89,538,000	0
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of financial assets		0
Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of cash and cash equivalents	32,014,000	100,000,000
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of cash and cash equivalents	32,014,000	100,000,000
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of cash and cash equivalents		0
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of cash and cash equivalents		$ 0
Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of cash and cash equivalents	7,711,000
Fair value of short and long term investments	7,711,000
Commercial Paper [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of cash and cash equivalents	7,711,000
Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of short and long term investments	70,869,000
Corporate Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of short and long term investments	70,869,000
US Government Agency Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of short and long term investments	10,958,000
US Government Agency Obligations [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of short and long term investments	$ 10,958,000

Fair Value of Financial Instr43

Fair Value of Financial Instruments - Additional Information (Detail) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Available For Sale Securities [Abstract]
Short term or long term investment	$ 89,538,000	$ 0

Fair Value of Financial Instr44

Fair Value of Financial Instruments - Summary of Composition of Short and Long Term Investments (Detail) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 89,926,000
Unrealized (Losses)	(388,000)
Aggregate Fair Value	89,538,000	$ 0
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,721,000
Unrealized (Losses)	(10,000)
Aggregate Fair Value	7,711,000
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	71,207,000
Unrealized (Losses)	(338,000)
Aggregate Fair Value	70,869,000
US Government Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	10,998,000
Unrealized (Losses)	(40,000)
Aggregate Fair Value	$ 10,958,000

Fair Value of Financial Instr45

Fair Value of Financial Instruments - Summary of Contractual Maturities of Short and Long Term Investments (Detail) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Amortized Cost Basis, Due within one year	$ 49,068,000
Amortized Cost Basis, Due after 1 year through 2 years	40,858,000
Amortized Cost	89,926,000
Aggregate Fair Value, Due within one year	48,972,000
Aggregate Fair Value, Due after 1 year through 2 years	40,566,000
Aggregate Fair Value, Total	$ 89,538,000	$ 0

Property and Equipment, Net - S

Property and Equipment, Net - Schedule of Property and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 25,155	$ 15,747
Less accumulated depreciation	(6,994)	(4,366)
Property and equipment, net	18,161	11,381
Computer Equipment and Purchased Software [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	1,237	904
Employee Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	307
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	3,907	3,010
Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	1,209	1,118
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	17,086	10,153
Equipment under Capital Lease [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 1,409	$ 562

Property and Equipment, Net - A

Property and Equipment, Net - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property Plant And Equipment [Abstract]
Depreciation expense	$ 2,700	$ 1,700	$ 1,500
Accumulated depreciation	$ 508	$ 339	$ 272

Intangible Assets - Additional

Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Finite Lived Intangible Assets [Line Items]
Cash consideration on acquisition	$ 600
Business combination other assets	50
Goodwill	443
Amortization expense	96	$ 138	$ 359
Acquired Technology [Member]
Finite Lived Intangible Assets [Line Items]
Business combination acquired technologies	$ 107
Estimated useful life	3 years
Acquired Intellectual Property [Member]
Finite Lived Intangible Assets [Line Items]
Estimated useful life	3 years

Intangible Assets - Schedule of

Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Finite Lived Intangible Assets [Line Items]
Accumulated amortization	$ (832)	$ (736)
Intangible assets, net	100	89
Acquired Technology [Member]
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets	$ 852	745
Acquired intangible assets, Weighted average remaining useful life	13 months
Acquired Intellectual Property [Member]
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets	$ 80	$ 80
Acquired intangible assets, Weighted average remaining useful life	15 months

Intangible Assets - Estimated F

Intangible Assets - Estimated Future Amortization Expense for Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Goodwill And Intangible Assets Disclosure [Abstract]
2,016	$ 84
2,017	16
Total	$ 100	$ 89

Debt - Additional Information (

Debt - Additional Information (Detail) - Revolving Line [Member]	12 Months Ended
	Dec. 31, 2015USD ($)
Line Of Credit Facility [Line Items]
Credit facility, borrowing capacity	$ 35,000,000
Debt instrument, expiration date	2017-03
Revolving credit facility, outstanding balance	$ 0
Credit facility, available borrowing capacity	30,700,000
Letters of credit outstanding balance	$ 4,300,000

Geographic Data - Additional In

Geographic Data - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015Segment
Segment Reporting [Abstract]
Number of operating segment	1

Geographic Data - Revenues by G

Geographic Data - Revenues by Geographical Region (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Total Revenues	$ 53,126	$ 47,711	$ 42,941	$ 38,166	$ 34,157	$ 30,448	$ 27,098	$ 24,174	$ 181,943	$ 115,876	$ 77,634
Americas [Member]
Segment Reporting Information [Line Items]
Total Revenues									154,625	103,356	74,437
Europe [Member]
Segment Reporting Information [Line Items]
Total Revenues									23,487	12,270	$ 3,197
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Total Revenues									$ 3,831	$ 250
Revenue [Member] | Outside Of United States [Member] | Geographic Concentration Risk [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage									15.00%	11.00%	4.00%

Geographic Data - Long Lived As

Geographic Data - Long Lived Assets by Geographical Region (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Total long lived assets	$ 18,161	$ 11,381
Americas [Member]
Segment Reporting Information [Line Items]
Total long lived assets	15,108	10,711
Europe [Member]
Segment Reporting Information [Line Items]
Total long lived assets	1,885	$ 670
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Total long lived assets	$ 1,168
Outside Of United States [Member] | Assets Total [Member] | Geographic Concentration Risk [Member]
Segment Reporting Information [Line Items]
Percentage of long lived assets held outside of the United States	17.00%	6.00%

Commitments and Contingencies-

Commitments and Contingencies- Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended					12 Months Ended
	Dec. 31, 2015	Nov. 30, 2015	Sep. 30, 2015	May. 31, 2015	Apr. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating And Capital Leased Assets [Line Items]
Increase in future lease commitments						$ 12,700
Improvement reimbursements from landlords						3,700
Rent expense						7,400	$ 4,900	$ 3,100
Deferred rent, net of current portion	$ 6,400					6,400	$ 4,300
Rent payable	128,588					128,588
Customer Relationship Management Vendor
Operating And Capital Leased Assets [Line Items]
Rent payable				$ 30,000
Renewal term				60 months
Web Hosting Vendor
Operating And Capital Leased Assets [Line Items]
Rent payable	$ 32,000					32,000
Renewal term	3 years
Lease Agreements One
Operating And Capital Leased Assets [Line Items]
Lease agreement period					10 years
Lease commence date					Jan. 1, 2016
Rent payable					$ 37,000
Lease Agreements Two
Operating And Capital Leased Assets [Line Items]
Lease agreement period			5 years
Lease commence date			Oct. 1, 2015
Rent payable			$ 1,300
Lease Agreements Three
Operating And Capital Leased Assets [Line Items]
Lease agreement period		20 years
Lease commence date	Nov. 1, 2015
Rent payable	$ 72,000	$ 14,000				72,000
Renewal term		10 years 6 months
Lease expiration date	Oct. 31, 2027
Lease Agreements Four
Operating And Capital Leased Assets [Line Items]
Lease agreement period	3 years
Lease commence date	Apr. 14, 2016
Rent payable	$ 1,700					1,700
Lease Agreement Additional
Operating And Capital Leased Assets [Line Items]
Rent payable	$ 2,400					$ 2,400
Lease expiration term						These leases expire at various dates through 2020.

Commitments and Contingencies -

Commitments and Contingencies - Schedule of Future Minimum Payments (Detail) $ in Thousands	Dec. 31, 2015USD ($)
Commitments And Contingencies Disclosure [Abstract]
Capital Leases, 2016	$ 561
Capital Leases, 2017	287
Capital Leases, Total	848
Less: Portion representing interest	(29)
Capital lease obligation	819
Operating, 2016	9,091
Operating, 2017	10,687
Operating, 2018	10,579
Operating, 2019	10,345
Operating, 2020	10,513
Operating, Thereafter	77,373
Operating, Total	$ 128,588

Changes in Accumulated Other 57

Changes in Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	$ 110,699	$ (93,248)
Ending Balance, Amount	121,708	110,699
Cumulative Translation Adjustment [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(145)	(79)
Other comprehensive loss before reclassifications	(272)	(66)
Ending Balance, Amount	(417)	(145)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Other comprehensive loss before reclassifications	(388)
Ending Balance, Amount	(388)
Total
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(145)	(79)
Other comprehensive loss before reclassifications	(660)	(66)
Ending Balance, Amount	$ (805)	$ (145)

Stockholders' Equity and Stoc58

Stockholders' Equity and Stock-Based Compensation - Additional Information (Detail) - USD ($)	Oct. 15, 2014	Sep. 25, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Convertible preferred stock	19,529,713
Convertible preferred stock outstanding			0	0
Preferred stock, conversion basis	33.00%
Common stock authorized			500,000,000	500,000,000
Number of Shares outstanding			3,331,000	4,588,000
Common stock shares issued			34,313,000	31,431,000
Software Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Capitalized software development costs excluded from stock based compensation			$ 492,000	$ 235,000	$ 273,000
Common Stock Warrant [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Common stock shares issued						13,000
Common stock warrant exercisable price						$ 5.70
Common stock warrant expiration date			Apr. 30, 2022
RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Percentage of service condition met			25.00%
The total stock-based compensation expense expected to be recorded			$ 36,300,000		0
Weighted average period of RSU			3 years 3 months 18 days
Number of RSUs expected to vest			1,500,000
Aggregate intrinsic value of RSUs expected to vest			$ 82,500,000
Total fair value of RSUs vested			$ 11,900,000	$ 0	$ 0
Common Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Weighted-average grant date fair value of options granted			$ 16.53	$ 9.72	$ 6.84
Maximum [Member] | RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Period of service condition met			4 years
Minimum [Member] | RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Period of service condition met			1 year
2007 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Number of shares available for issuance				0
Unrecognized compensation costs			$ 8,200,000
Unrecognized compensation costs, weighted average period			2 years 4 months 24 days
2007 Equity Incentive Plan [Member] | Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Number of Shares outstanding			2,900,000
2007 Equity Incentive Plan [Member] | RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Number of Shares outstanding			479,000
2007 Equity Incentive Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Number of years fixed for each option			10 years
2014 Stock Option and Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Percentage of common stock outstanding		5.00%
Unrecognized compensation costs			$ 8,200,000
Unrecognized compensation costs, weighted average period			2 years 4 months 24 days
2014 Stock Option and Incentive Plan [Member] | Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Number of shares available for issuance		1,973,551
Number of Shares outstanding			397,000
2014 Stock Option and Incentive Plan [Member] | RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Number of Shares outstanding			1,200,000
2014 Stock Option and Incentive Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Number of years fixed for each option		10 years

Stockholders' Equity and Stoc59

Stockholders' Equity and Stock-Based Compensation - Summary of Number of Shares of Common Stock Reserved (Detail) - shares shares in Thousands	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for the potential conversion	5,034	5,977
Common Stock Warrant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for the potential conversion		13
Common Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for the potential conversion	3,331	4,588
RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for the potential conversion	1,703	1,376

Stockholders' Equity and Stoc60

Stockholders' Equity and Stock-Based Compensation - Stock Compensation Expense by Award is Recorded in the Company's Consolidated Statements of Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation	$ 21,308	$ 16,358	$ 3,464
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation	1,035
Common Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation	6,349	5,128	3,080
Vesting of RSAs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation			$ 384
RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation	$ 13,924	$ 11,230

Stockholders' Equity and Stoc61

Stockholders' Equity and Stock-Based Compensation - Effect of Stock-Based Compensation on Income by Line Item (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation	$ 21,308	$ 16,358	$ 3,464
Cost of Revenue, Subscription [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation	341	128	50
Cost of Revenue, Service [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation	1,216	498	211
Research and Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation	6,327	6,190	691
Sales and Marketing [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation	7,658	5,596	1,194
General and Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total stock-based compensation	$ 5,766	$ 3,946	$ 1,318

Stockholders' Equity and Stoc62

Stockholders' Equity and Stock-Based Compensation - Schedule of Assumptions Used for Estimation of Fair Value of Options Granted to Employees (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	1.36%	1.79%	0.82%
Expected term (in years)	6 years 2 months 5 days	5 years	4 years 7 months 6 days
Volatility	43.00%	44.80%	46.80%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	1.53%	2.67%	1.86%
Expected term (in years)	6 years 2 months 19 days	6 years 6 months	6 years 6 months
Volatility	51.60%	50.90%	54.70%

Stockholders' Equity and Stoc63

Stockholders' Equity and Stock-Based Compensation - Summary of Stock Option Activity (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Shares, Beginning balance	4,588
Number of Shares, Granted	318
Number of Shares, Exercised	(1,334)
Number of Shares, Forfeited/Expired	(241)
Number of Shares, Ending balance	3,331	4,588
Number of Shares, Vested and expected to vest	3,202
Number of Shares, Exercisable	2,174
Weighted Average Exercise Price, Beginning balance	$ 9.64
Weighted Average Exercise Price, Granted	34.51
Weighted Average Exercise Price, Exercised	7.53
Weighted Average Exercise Price, Forfeited/ Expired	18.73
Weighted Average Exercise Price , Ending balance	12.18	$ 9.64
Weighted Average Exercise Price, Vested and expected to vest	11.80
Weighted Average Exercise Price, Exercisable	$ 7.97
Weighted Average Remaining Life, Outstanding	6 years 10 months 24 days	7 years 7 months 6 days
Weighted Average Remaining Life, Options vested or expected to vest	6 years 10 months 24 days
Weighted Average Remaining Life, Options exercisable	6 years 3 months 18 days
Aggregate Intrinsic Value, Outstanding	$ 146,994	$ 110,396
Aggregate Intrinsic Value, Options vested or expected to vest	142,552
Aggregate Intrinsic Value, Options exercisable	$ 104,844

Stockholders' Equity and Stoc64

Stockholders' Equity and Stock-Based Compensation - Summary of Activity Related to RSUs (Detail) - RSUs [Member] shares in Thousands	12 Months Ended
	Dec. 31, 2015$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Shares, Beginning balance | shares	1,376
Shares, Granted | shares	1,284
Shares, Vested | shares	(752)
Shares, Canceled | shares	(205)
Restricted shares, Ending balance | shares	1,703
Weighted average grant date fair value, Beginning balance | $ / shares	$ 17.40
Weighted- Average Grant Date Fair Value, Granted | $ / shares	40.69
Weighted- Average Grant Date Fair Value, Vested | $ / shares	15.83
Weighted- Average Grant Date Fair, Canceled | $ / shares	25.83
Weighted average grant date fair value, Ending balance | $ / shares	$ 34.64

Employee Stock Purchase Plan -

Employee Stock Purchase Plan - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	Sep. 25, 2014	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorizes for issuance		5,034,000	5,977,000
Percentage of discount allowed to employee to purchase common stock	15.00%
2014 Employee Share Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorizes for issuance	709,017
Issuance of common stock under stock plans, net of shares withheld for employee taxes, shares		29,000
Weighted average purchase price per share		$ 28.46
Cash proceeds from purchase of shares		$ 814

Income Taxes - Schedule of Loss

Income Taxes - Schedule of Loss Before Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
United States	$ (47,911)	$ (49,634)	$ (34,393)
Foreign	2,270	1,313	119
Total	$ (45,641)	$ (48,321)	$ (34,274)

Income Taxes - Components of In

Income Taxes - Components of Income Tax (Provision) Benefit (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Current income tax provision
State	$ (61)	$ (20)
Foreign	(401)	(12)
Total current income tax provision	(462)	(32)
Deferred income tax (provision) benefit
Federal	(10)
Foreign	60	124
Total deferred income tax (provision) benefit	50	124
Total income tax (provision) benefit	$ (412)	$ 92

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015USD ($)Subsidiary	Dec. 31, 2014USD ($)
Reconciliation Of Income Taxes [Line Items]
Federal statutory income tax rate	35.00%
Increase in valuation allowance	$ 19,400,000	$ 16,800,000
Valuation allowance changes, description	The Company does not expect any significant changes in its valuation allowance within the next 12 months.
Federal net operating loss carryforwards	$ 212,200,000
State net operating loss carryforwards	$ 137,300,000
Federal and state net operating loss carryforwards, expiration year	Dec. 31, 2035
Net operating loss carryforwards	$ 60,188,000	46,615,000
Research and development credits	5,040,000	$ 2,334,000
Federal research credit	$ 876,000
Federal research credit, description	In December 2015, U.S. legislation was enacted to permanently reinstate the federal Research & Development tax credit (R&D tax credit) which had expired on December 31, 2014. The Company increased its U.S. net deferred tax assets and related valuation allowance by $876 thousand for 2015 federal research credit.
Minimum percentage chances of tax benefit to be realized on examination	50.00%
Unrecognized tax benefits affect the Company's effective tax rate	$ 0
Interest or penalties recorded	$ 0
Expected significant change in unrecognized tax benefits, description	The Company does not expect any significant change in its unrecognized tax benefits within the next 12 months
Additional Paid-In Capital [Member]
Reconciliation Of Income Taxes [Line Items]
Net operating loss carryforwards	$ 21,100,000
Non-U.S [Member]
Reconciliation Of Income Taxes [Line Items]
Number of subsidiaries | Subsidiary	3
Research and development credits	$ 100,000
Federal [Member]
Reconciliation Of Income Taxes [Line Items]
Research and development credits	$ 3,300,000
Research and development credit carryforwards, expiration year	Dec. 31, 2035
State [Member]
Reconciliation Of Income Taxes [Line Items]
Research and development credits	$ 2,200,000
Research and development credit carryforwards, expiration year	Dec. 31, 2035
Investments credits	$ 246,000

Income Taxes - Schedule of Diff

Income Taxes - Schedule of Differences Between Income Taxes Computed at the Federal Statutory Rate and the Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Expected income tax benefit at the federal statutory rate	$ 15,974	$ 16,913	$ 11,997
State taxes net of federal benefit	2,257	1,709	1,197
Stock-based compensation	(1,685)	(886)	(830)
Difference in foreign tax rates	482	289	27
U.S. tax credits	2,738	1,331	444
Change in valuation allowance	(19,421)	(18,719)	(12,367)
Other	(757)	(545)	$ (468)
Total income tax (provision) benefit	$ (412)	$ 92

Income Taxes - Components of th

Income Taxes - Components of the Company's Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Net operating loss carryforwards	$ 60,188	$ 46,615
Research and investment credits	5,040	2,334
Accruals and reserves	5,788	3,423
Depreciation	579	372
Intangible assets	223
Stock-based compensation	6,901	5,409
Total deferred tax assets	78,719	58,153
Deferred tax liabilities:
Capitalized costs	(3,916)	(2,808)
Total deferred tax liabilities	(3,916)	(2,808)
Valuation allowance	(74,642)	(55,221)
Net deferred tax assets	$ 161	$ 124

Income Taxes - Summary of Activ

Income Taxes - Summary of Activity Related to Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Unrecognized benefit - beginning of the year	$ 1,713	$ 1,030	$ 667
Gross increases-current period positions	171	683	363
Gross decrease—prior period positions	(1,211)
Unrecognized benefit - end of period	$ 673	$ 1,713	$ 1,030

Employee Benefit Plan - Additio

Employee Benefit Plan - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Postemployment Benefits [Abstract]
Contribution to Defined contribution savings plan	$ 1,200	$ 549	$ 366

Quarterly Financial Results (73

Quarterly Financial Results (Unaudited) - Schedule of Quarterly Financial Results (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 53,126	$ 47,711	$ 42,941	$ 38,166	$ 34,157	$ 30,448	$ 27,098	$ 24,174	$ 181,943	$ 115,876	$ 77,634
Cost of revenue	13,707	12,478	11,273	10,465	9,929	9,205	8,282	7,664	47,923	35,080	27,504
Gross profit	39,419	35,233	31,668	27,701	24,228	21,243	18,816	16,510	134,020	80,796	50,130
Net loss	(10,252)	(13,552)	(11,392)	(10,858)	(19,697)	(10,793)	(8,279)	(9,465)	(46,053)	(48,229)	(34,274)
Net loss attributable to common stockholders	$ (10,252)	$ (13,552)	$ (11,392)	$ (10,858)	$ (19,988)	$ (10,806)	$ (8,292)	$ (9,477)	$ (46,053)	$ (48,560)	$ (34,328)
Net loss attributable to common stockholders per common share, basic and diluted	$ (0.30)	$ (0.40)	$ (0.34)	$ (0.34)	$ (0.69)	$ (1.84)	$ (1.44)	$ (1.73)	$ (1.39)	$ (4.20)	$ (6.71)