Marin Software (MRIN) 10-K20 Feb 152014 FY Annual reportFinancial data

Company Profile

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Jan. 31, 2015	Jun. 30, 2014
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	FALSE
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Trading Symbol	MRIN
Entity Registrant Name	MARIN SOFTWARE INC
Entity Central Index Key	1389002
Current Fiscal Year End Date	-19
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		35,400,000
Entity Public Float			$229

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current assets
Cash and cash equivalents	$68,253	$104,407
Accounts receivable, net	18,726	14,921
Prepaid expenses and other current assets	4,751	2,695
Total current assets	91,730	122,023
Property and equipment, net	16,274	14,417
Goodwill	11,527	0
Intangible assets, net	7,399	0
Other noncurrent assets	1,287	937
Total assets	128,217	137,377
Current liabilities
Accounts payable	3,737	1,018
Accrued expenses and other current liabilities	12,053	10,950
Deferred revenues	2,052	2,566
Current portion of long-term debt	2,587	3,253
Total current liabilities	20,429	17,787
Long-term debt, less current portion	621	2,962
Other long-term liabilities	1,050	1,284
Total liabilities	22,100	22,033
Commitments and contingencies (Note 15)
Stockholders' equity
Common stock, $0.001 par value - 500,000 and 36,000 shares authorized, 35,846 and 33,133 shares issued, 35,181, and 32,953 outstanding at December 31, 2014 and December 31, 2013, respectively	35	33
Additional paid-in capital	253,221	228,512
Accumulated deficit	-146,392	-113,201
Accumulated other comprehensive loss	-747	0
Total stockholders' equity	106,117	115,344
Total liabilities and stockholders' equity	$128,217	$137,377

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Common stock, par value	$0.00	$0.00
Common stock, shares authorized	500,000	36,000
Common stock, shares issued	35,846	33,133
Common stock, shares outstanding	35,181	32,953

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Loss (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues, net	$99,354	$77,315	$59,558
Cost of revenues	35,614	31,109	24,764
Gross profit	63,740	46,206	34,794
Operating expenses
Sales and marketing	47,716	42,799	32,633
Research and development	28,751	20,715	14,014
General and administrative	21,257	17,028	13,432
Total operating expenses	97,724	80,542	60,079
Loss from operations	-33,984	-34,336	-25,285
Interest expense, net	-177	-453	-520
Other expenses, net	-466	-571	-456
Loss before benefit from (provision for) income taxes	-34,627	-35,360	-26,261
Benefit from (provision for) income taxes	1,456	-492	-221
Net loss	-33,171	-35,852	-26,482
Foreign currency translation adjustments	-747	0	0
Comprehensive loss	-33,918	-35,852	-26,482
Net loss per share available to common stockholders, basic and diluted	($0.97)	($1.36)	($6)
Weighted-average shares used to compute net loss per share available to common stockholders, basic and diluted	34,210	26,312	4,417
Stock-based compensation is allocated as follows (Note 11):
Allocation of stock-based compensation	0	0	2,590
Amortization of intangible assets is allocated as follows (Note 5):
Amortization of intangible assets	1,131	0	0
Cost of Revenues [Member]
Stock-based compensation is allocated as follows (Note 11):
Allocation of stock-based compensation	765	887	439
Amortization of intangible assets is allocated as follows (Note 5):
Amortization of intangible assets	399	0	0
Sales and Marketing [Member]
Stock-based compensation is allocated as follows (Note 11):
Allocation of stock-based compensation	1,895	1,304	1,005
Amortization of intangible assets is allocated as follows (Note 5):
Amortization of intangible assets	261	0	0
Research and Development [Member]
Stock-based compensation is allocated as follows (Note 11):
Allocation of stock-based compensation	3,785	1,346	831
Amortization of intangible assets is allocated as follows (Note 5):
Amortization of intangible assets	397	0	0
General and Administrative [Member]
Stock-based compensation is allocated as follows (Note 11):
Allocation of stock-based compensation	2,797	1,681	2,673
Amortization of intangible assets is allocated as follows (Note 5):
Amortization of intangible assets	$74	$0	$0

Consolidated_Statements_of_Con

Consolidated Statements of Convertible Preferred Stock and Stockholders' (Deficit) Equity (USD $)	Total	Convertible Preferred Stock [Member]	Convertible Preferred Stock [Member]	Convertible Preferred Stock [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]
In Thousands	Total	Convertible Preferred Stock [Member]	Series F [Member]	Series F-1 [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]
Beginning Balance at Dec. 31, 2011	($48,408)	$51,514			$5	$2,454	($50,867)
Beginning Balance, shares at Dec. 31, 2011		14,470			4,439
Issuance of stock, net of issuance costs			34,294	19,902
Issuance of stock, shares			2,805	1,478
Issuance of common stock from exercise of vested stock options and vesting of options and shares subject to repurchase	759					759
Issuance of common stock from exercise of vested stock options and vesting of options and shares subject to repurchase, shares	518				500
Issuance of common stock from stock purchase agreements	500					500
Issuance of common stock from stock purchase agreements, shares					84
Redemption of common stock	-4,488					-4,488
Issuance of common stock under employee stock purchase plan	0
Redemption of common stock, shares					-365
Issuance of unrestricted common stock in connection with acquisition of NowSpots Inc.	0
Stock-based compensation expense	4,948					4,948
Compensation expense from issuance of warrants	60					60
Issuance of warrants in connection with debt agreement	213					213
Stock-based compensation tax benefits	192					192
Net loss	-26,482						-26,482
Foreign currency translation adjustments and other, net	0
Ending Balance at Dec. 31, 2012	-72,706	105,710			5	4,638	-77,349
Ending Balance, shares at Dec. 31, 2012		18,753			4,658
Issuance of stock, net of issuance costs	109,307				8	109,299
Issuance of stock, shares					8,625
Conversion of convertible preferred stock into common stock	105,710	-105,710			19	105,691
Conversion of convertible preferred stock into common stock, shares		-18,753			18,753
Conversion of warrant to purchase convertible preferred stock into warrant to purchase common stock	745					745
Conversion of warrant to purchase convertible preferred stock into warrant to purchase common stock, shares	0	0			0	0	0	0
Issuance of common stock from exercise of vested stock options and vesting of options and shares subject to repurchase	1,649				1	1,648
Issuance of common stock from exercise of vested stock options and vesting of options and shares subject to repurchase, shares	618				725
Issuance of common stock from cashless exercise of warrants	0	0			0	0	0	0
Issuance of common stock from cashless exercise of warrants, shares					68
Issuance of common stock under employee stock purchase plan	1,231					1,231
Issuance of common stock under employee stock purchase plan, shares					146
Issuance of unrestricted common stock in connection with acquisition of NowSpots Inc.	0
Stock-based compensation expense	5,218					5,218
Repurchase of unvested shares	-77					-77
Repurchase of unvested shares, shares					-22
Stock-based compensation tax benefits	119					119
Net loss	-35,852						-35,852
Foreign currency translation adjustments and other, net	0
Ending Balance at Dec. 31, 2013	115,344				33	228,512	-113,201
Ending Balance, shares at Dec. 31, 2013					32,953
Issuance of common stock from exercise of vested stock options and vesting of options and shares subject to repurchase	2,841					2,841
Issuance of common stock from exercise of vested stock options and vesting of options and shares subject to repurchase, shares	791				938
Issuance of common stock under employee stock purchase plan	1,402					1,402
Issuance of common stock under employee stock purchase plan, shares					178
Issuance of unrestricted common stock in connection with acquisition of NowSpots Inc.	11,195				2	11,193
Issuance of unrestricted common stock in connection with acquisition of NowSpots Inc, shares					1,119
Transaction costs incurred in connection with acquisition of NowSpots Inc.	-52					-52
Stock-based compensation expense	9,242					9,242
Repurchase of unvested shares	-20					-20
Repurchase of unvested shares, shares					-7
Stock-based compensation tax benefits	126					126
Net loss	-33,171						-33,171
Foreign currency translation adjustments and other, net	-747					-23	-20	-747
Ending Balance at Dec. 31, 2014	$106,117				$35	$253,221	($146,392)	($747)
Ending Balance, shares at Dec. 31, 2014					35,181

Consolidated_Statements_of_Con1

Consolidated Statements of Convertible Preferred Stock and Stockholders' (Deficit) Equity (Parenthetical) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Issuance of common stock in connection with initial public offering, issuance costs	$11,451
Series F [Member]
Issuance of stock, issuance costs		194
Series F-1 [Member]
Issuance of stock, issuance costs		$98

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating activities
Net loss	($33,171)	($35,852)	($26,482)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation	5,669	4,722	2,642
Amortization of internally developed software	1,905	1,156	525
Amortization of intangible assets	1,131	0	0
Loss (gain) on disposal of property and equipment	16	10	-7
Noncash interest expense related to warrants issued in connection with debt	124	251	159
Noncash expense related to warrants issued in connection with service agreement	0	0	60
Change in the valuation of outstanding preferred stock warrants	0	238	362
Stock-based compensation related to equity awards and restricted stock	9,242	5,218	2,358
Stock-based compensation related to preferred stock financing	0	0	2,590
Provision for bad debt	821	359	296
Deferred income tax benefits	-2,258	-91	-108
Excess tax benefits from stock-based award activities	-126	-119	-192
Changes in operating assets and liabilities, net of effect of acquisition
Accounts receivable	-4,561	-2,147	-3,382
Prepaid expenses and other current assets	-2,009	-881	-550
Other assets	-497	-524	-55
Accounts payable	1,387	75	-208
Deferred revenues	-540	1,948	445
Accrued expenses and other current liabilities	-1,523	2,240	2,452
Net cash used in operating activities	-24,390	-23,397	-19,095
Investing activities
Purchases of property and equipment	-5,317	-5,023	-5,507
Capitalization of internally developed software	-3,146	-3,216	-1,743
Acquisition of business, net of cash acquired	-4,151	0	0
Net cash used in investing activities	-12,614	-8,239	-7,250
Financing activities
Proceeds from issuance of common stock in initial public offering, net of issuance costs	0	109,414	-107
Proceeds from issuance of note payable, net of issuance costs	0	1,667	8,631
Repayment of note payable	-3,130	-9,660	-4,334
Redemption of common stock	0	0	-4,488
Repurchase of unvested shares	-20	-77	-48
Proceeds from issuance of convertible, preferred stock, net of issuance costs	0	0	54,196
Proceeds from common stock purchase agreements	0	0	500
Proceeds from exercise of common stock options	2,472	1,541	1,624
Proceeds from employee stock purchase plan	1,402	1,499	0
Excess tax benefits from stock-based award activities	126	119	192
Net cash provided by financing activities	850	104,503	56,166
Net (decrease) increase in cash and cash equivalents	-36,154	72,867	29,821
Cash and cash equivalents
Beginning of year	104,407	31,540	1,719
End of year	68,253	104,407	31,540
Supplemental disclosures of other cash flow information
Cash paid for interest	106	201	453
Cash paid for income taxes	221	276	176
Supplemental disclosure of noncash investing and financing activities
Conversion of convertible preferred stock to common stock	0	105,710	0
Acquisition of equipment through capital lease	0	3,167	0
Conversion of warrant to purchase convertible preferred stock to common stock warrant	0	745	0
Purchases of property and equipment recorded in accounts payable and accrued expenses	1,364	208	533
Issuance of common stock under employee stock purchase plan	1,402	1,231	0
Issuance of common stock in connection with business acquisition	11,195	0	0
Accrued but unpaid debt issuance costs	0	38	57
Unpaid deferred initial public offering costs	0	0	944
Other receivables for stock option exercises	$0	$0	$49

Background

Background	12 Months Ended
Background	Dec. 31, 2014
Accounting Policies [Abstract]
Background	1. Background
	Marin Software Incorporated (the “Company”) was incorporated in Delaware in March 2006. The Company provides a leading cross-channel performance advertising cloud, offering an integrated software-as-a-service, or SaaS, platform for search, display, and social advertising channels. The Company’s platform enables digital marketers to improve financial performance, realize efficiencies and time savings, and make better business decisions. The Company’s corporate headquarters are located in San Francisco, California, and the Company has additional offices in the following locations: New York, Chicago, Austin, Portland, London, Dublin, Hamburg, Paris, Tokyo, Singapore, Sydney and Shanghai.
	On March 27, 2013, the Company closed its initial public offering (“IPO”) of 7,500 shares of its common stock sold by the Company. The public offering price of the shares sold in the IPO was $14.00 per share. The total gross proceeds from the IPO to the Company were $105,000. After deducting underwriting discounts and commissions and IPO expenses payable by the Company, the aggregate net proceeds totaled $94,659. On April 11, 2013, the underwriters of the IPO fully exercised the over-allotment option granted to them. As a result, the Company issued an additional 1,125 shares for net proceeds of $14,648.

Summary_of_Significant_Account

Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2014

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

2. Summary of Significant Accounting Policies

Basis of Presentation

The accompanying consolidated financial statements have been prepared on a going concern basis, which contemplates the realization of assets and the satisfaction of liabilities in the normal course of business.

Principles of Consolidation

The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany accounts and transactions have been eliminated upon consolidation.

Accounting Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States (“GAAP”) requires management to make certain estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. The Company is subject to uncertainties such as the impact of future events, economic and political factors and changes in the Company’s business environment; therefore, actual results could differ from these estimates. Accordingly, the accounting estimates used in the preparation of the Company’s financial statements will change as new events occur, as more experience is acquired, as additional information is obtained and as the Company’s operating environment changes. Changes in estimates are made when circumstances warrant. Such changes in estimates and refinements in estimation methodologies are reflected in reported results of operations and if material, the effects of changes in estimates are disclosed in the notes to the consolidated financial statements. Significant estimates and assumptions by management affect the allowances for doubtful accounts and customer credits, the carrying value of long-lived assets (including goodwill and intangible assets), the useful lives of long-lived assets, the provision for income taxes and related deferred taxes, and stock-based compensation.

Certain Significant Risks and Uncertainties

The Company operates in a rapidly changing environment that involves a number of risks, some of which are beyond the Company’s control that could have a material adverse effect on the Company’s business, operating results, and financial condition. These risks include, among others, the Company’s: history of losses and ability to achieve profitability in the future; highly competitive environment; ability to maintain and increase usage rate of the Company’s platform; and ability to increase demand for its solutions.

Concentration of Credit Risk

Financial instruments that potentially subject the Company to concentrations of credit risk consist of cash, cash equivalents and accounts receivable. The Company’s cash and cash equivalents are placed with high-credit-quality financial institutions and issuers, and at times exceed federally insured limits. The Company limits its concentration of risk in cash equivalents and short-term investments by diversifying its investments among a variety of industries and issuers and by limiting the average maturity to one year or less. The Company has not experienced any loss relating to cash and cash equivalents in these accounts. The Company performs periodic credit evaluations of its customers and generally does not require collateral.

As of December 31, 2014 and 2013, no single customer accounted for greater than 10% of net accounts receivable. No single customer accounted for greater than 10% of consolidated revenues during the years ended December 31, 2014, 2013 and 2012.

Cash and Cash Equivalents

The Company considers all highly liquid investments with an original or remaining maturity from the Company’s date of purchase of 90 days or less to be cash equivalents. Deposits held with financial institutions are likely to exceed the amount of insurance on these deposits. Cash equivalents consist of money market funds, which are readily convertible into cash and are stated at cost, which approximates fair market value. Cash equivalents were $58,027 and $98,987 as of December 31, 2014 and 2013, respectively.

Fair Value of Financial Instruments

The Company’s financial instruments, including cash equivalents, accounts receivable, accounts payable and accrued expenses are carried at cost, which approximates fair value because of the short-term nature of those instruments. Based on borrowing rates available to the Company for loans with similar terms and maturities, and in consideration of the Company’s credit risk profile, the carrying value of borrowings (Note 7) approximates fair value (Level 2 within the fair value hierarchy).

The Company measures and reports certain financial assets at fair value on a recurring basis, including its investments in money market funds. The fair value hierarchy prioritizes the inputs into three broad levels:

Level 1

Inputs are unadjusted quoted prices in active markets for identical assets or liabilities.

Level 2

Inputs are quoted prices for similar assets and liabilities in active markets or inputs that are observable for the asset or liability, either directly or indirectly through market corroboration, for substantially the full term of the financial instrument.

Level 3

Inputs are unobservable inputs based on the Company’s assumptions.

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

Allowance for Doubtful Accounts and Revenue Credits

The allowance for doubtful accounts reflects the Company’s best estimate of probable losses inherent in the Company’s receivables portfolio determined on the basis of historical experience, specific allowances for known troubled accounts and other currently available evidence. The Company has not experienced significant credit losses from its accounts receivable. The Company performs a regular review of its customers’ payment histories and associated credit risks and it does not require collateral from its customers. Certain contracts with advertising agencies contain sequential liability provisions, whereby the agency does not have an obligation to pay the Company until payment is received from the agency’s customers. In these circumstances, the Company evaluates the credit worthiness of the agency’s customers, in addition to the agency itself. The following are changes in the allowance for doubtful accounts during 2014, 2013 and 2012, respectively.

Years Ended December 31,

2014

2013

2012

Balances at beginning of period

417

277

196

Additions

821

359

296

Write-offs

(249

)

(219

)

(215

)

Balances at end of period

989

417

277

From time to time, the Company provides credits to customers and an allowance is made based on historical credit activity. As of December 31, 2014 and 2013, the Company recorded an allowance for potential customer credits in the amount of $508 and $389, respectively.

Property and Equipment

Property and equipment are stated at historical cost less accumulated depreciation and amortization. Depreciation and amortization are computed using the straight-line method over the estimated useful lives of the related assets.

The useful lives of the property and equipment are as follows:

Computer equipment

3 to 5 years

Office equipment, furniture and fixtures

3 to 5 years

Software

3 years

Leasehold improvements

Shorter of useful life or lease term

Upon retirement or sale, the cost and related accumulated depreciation are removed from the balance sheet and the resulting gain or loss is reflected in operations. Major additions and improvements are capitalized while repairs and maintenance that do not extend the life of the asset are charged to operations as incurred. Depreciation and amortization expense is allocated to both cost of revenues and operating expenses.

Internally Developed Software

Costs incurred in the development phase are capitalized and amortized over the product’s estimated useful life, which is three years. The Company expenses all costs incurred that relate to planning and post implementation phases of development. Capitalized costs related to internally developed software under development are treated as construction in progress until the program, feature or functionality is ready for its intended use, at which time amortization commences. For 2014, 2013 and 2012, the Company capitalized $3,146, $3,216, and $1,743 of costs related to internally developed software, respectively. Amortization of capitalized costs related to internally developed software was $1,905, $1,156, and $525 for 2014, 2013 and 2012, respectively. As of December 31, 2014 and 2013, unamortized internally developed software costs totaled $5,476 and $4,236, respectively. Amortization of internally developed software is reflected in cost of revenues. Costs associated with minor enhancements and maintenance are expensed as incurred.

Goodwill, Intangible Assets and Impairment Assessments

Goodwill represents the excess of the purchase price in a business combination over the fair value of net tangible and intangible assets acquired. Intangible assets that are not considered to have an indefinite useful life are amortized over their useful lives, which generally range from two to six years. Estimated remaining useful lives of purchased intangible assets are evaluated to assess whether events or changes in circumstances warrant a revision to the remaining periods of amortization.

In addition, we evaluate our goodwill for impairment at least annually or more frequently if events or changes in circumstances indicate that these assets may be impaired. No goodwill impairment has been identified in any of the years presented.

Impairment of Long-Lived Assets

The Company evaluates long-lived assets, excluding goodwill, for potential impairment whenever adverse events or changes in circumstances or business climate indicate that expected undiscounted future cash flows related to such long-lived assets may not be sufficient to support the net book value of such assets. An impairment exists when the carrying value of a long-lived asset exceeds its fair value. An impairment loss is recognized only if the carrying value of a long-lived asset is not recoverable and exceeds its fair value. The carrying value of a long-lived asset is not recoverable if it exceeds the sum of the undiscounted cash flows expected to result from the use and eventual disposition of the asset. There were no such impairment losses during 2014, 2013 or 2012.

Operating Leases

The Company’s operating lease agreements include provisions for tenant improvement allowances, certain rent holidays and escalations in the base price of the rent payment. The Company defers tenant improvement allowances and amortizes the balance as a reduction to rent expense over the lease term. The Company records rent holidays and rent escalations on a straight-line basis over the lease term. Deferred rent is included in accrued expenses and other current liabilities in the accompanying consolidated balance sheets.

Freestanding Preferred Stock Warrants

Upon the consummation of the Company’s IPO, freestanding warrants related to the Company’s convertible preferred stock converted into warrants to purchase common stock. The preferred stock warrants were classified as liabilities on the Company’s December 31, 2012 consolidated balance sheet. Upon conversion, the liability recorded for the preferred stock warrants was reclassified to additional paid-in capital. When classified as liabilities, the preferred stock warrants were subject to reassessment at each balance sheet date, and any change in fair value was recognized as a component of other income (expenses), net. The Company adjusted the liability for changes in fair value until the preferred stock warrants were converted into warrants to purchase common stock.

Revenue Recognition

The Company generates revenues principally from subscriptions either directly with advertisers or with advertising agencies to its platform for the management of search, display and social advertising. The Company’s subscription agreements are generally one year or longer in length. The Company’s subscription fee under most contracts is variable based on the value of the advertising spend that the Company’s advertisers manage through the Company’s platform and is generally invoiced on a monthly basis. Contracts with direct advertisers and certain contracts with advertising agencies also include a minimum monthly fee that is payable over the duration of the contract. The Company’s customers do not have the right to take possession of the software supporting the application service at any time, nor do the arrangements contain general rights of return. The Company commences revenue recognition for both direct advertisers and advertising agencies when all of the following conditions are met:

•

persuasive evidence of an arrangement exists;

•

the Company’s platform is made available to the customer;

•

the fee is fixed or determinable, and;

•

collection is reasonably assured.

The Company recognizes the total minimum fee for both direct advertisers and advertising agencies, where applicable, over the duration of the contract, commencing on the date that the Company’s platform is made available to the customer, provided revenues recognized do not exceed amounts that are invoiced and due. The variable fee, which is based on a percentage of the value of the advertising spend managed through the Company’s platform, is recognized once the amount is fixed or determinable, which is generally on a monthly basis concurrent with the issuance of the customer invoice. Signed contracts are used as evidence of an arrangement. The Company assesses collectability based on a number of factors such as past collection history with the customer and creditworthiness of the customer. Certain agreements with advertising agencies also contain sequential liability provisions, which provide that the agency has no obligation to pay the Company until the agency receives payment from its customers. In these circumstances, the Company evaluates the credit worthiness of the agency’s customers, in addition to the agency itself, to conclude whether or not collectability is reasonably assured. If the Company determines collectability is not reasonably assured, the Company defers the revenue recognition until collectability becomes reasonably assured.

In October 2009, the Financial Accounting Standards Board (“FASB”) ratified authoritative accounting guidance regarding revenue recognition for arrangements with multiple deliverables effective for fiscal periods beginning on or after June 15, 2010. The Company adopted the new guidance on a prospective basis for fiscal 2011. Professional services and training, when sold with the Company’s platform subscription services, are accounted for separately when those services have standalone value. In determining whether professional services and training services can be accounted for separately from subscription services, the Company considers the following factors: availability of the services from other vendors; the nature of the services; the dependence of the subscription services on the customer’s decision to buy the professional services; and whether the Company sells the Company’s subscription services without professional services. If the deliverables have stand-alone value, the Company accounts for each deliverable separately and revenues are recognized for the respective deliverables as they are delivered. If one or more of the deliverables do not have stand-alone value, the deliverables that do not have stand-alone value are combined with the final deliverables within the arrangement and treated as a single unit of accounting. Revenues for arrangements treated as a single unit of accounting are recognized over the period of the contract commencing upon delivery of the final deliverable. As of

December 31, 2014, the Company did not have stand-alone value for the professional services and training services. This is because the Company includes professional services and training services with the Company’s subscription services and those services are not available from other vendors.

Cost of Revenues

Cost of revenues primarily consists of costs related to hosting the Company’s cloud-based platform, providing implementation and ongoing customer support, data communications expenses, salaries and benefits of operations and support personnel, software license fees, costs associated with website development activities, allocated overhead, amortization expense associated with capitalized internally developed software and intangible assets and property and equipment depreciation.

Stock-Based Compensation

Stock-based compensation is measured at grant date based on the fair value of the award and is expensed on a straight-line basis over the requisite service period.

Fair values of stock option awards are determined on the date of grant using an option-pricing model. The Company has selected the Black-Scholes option pricing model to estimate the fair value of its stock option awards to employees and non-employees. In applying the Black-Scholes option pricing model, the Company’s determination of the fair value of the stock option award on the date of grant is affected by the Company’s fair value of its common stock, as well as assumptions regarding a number of subjective variables. These variables include, but are not limited to, the Company’s expected stock price volatility and the optionholders’ actual and projected stock option exercise and employment termination behaviors.

For stock option awards with time-based vesting, the Company recognizes stock-based compensation expense over the requisite service period using the straight-line method, based on awards ultimately expected to vest. The Company estimates future forfeitures at the date of grant and revises the estimates, if necessary, in subsequent periods if actual forfeitures differ from those estimates.

Restricted stock units (“RSUs”) are measured based on the fair market values of the underlying common stock on the dates of grant. Shares of common stock are issued on the vesting dates. For awards with time-based vesting, the Company recognizes stock-based compensation expense over the requisite service period using the straight-line method, based on awards ultimately expected to vest. The Company estimates future forfeitures at the date of grant and revises the estimates, if necessary, in subsequent periods if actual forfeitures differ from those estimates.

Stock options issued to non-employees such as consultants are recorded at their fair value on the measurement date. The measurement of stock-based compensation is subject to periodic adjustment as the underlying equity instruments vest. The fair value of options granted to consultants is expensed when vested, and such vested outstanding options are recognized as liabilities on the accompanying consolidated balance sheets. Non-employee stock-based compensation expense was not material for all periods presented.

See Note 11 for further information.

Research and Development

Research and development costs are expensed as incurred, except for certain internal software development costs, which may be capitalized as noted above. Research and development costs include salaries, stock-based compensation expense, benefits and other operating costs such as outside services, supplies and allocated overhead costs.

Advertising and Promotion

Advertising and promotional costs are expensed as incurred and included in sales and marketing expense in the accompanying consolidated statements of operations. Advertising and promotion expense totaled $1,475, $785, and $632 for 2014, 2013 and 2012, respectively.

Foreign Currency

For international subsidiaries whose functional currency is not the U.S. dollar, we translate the monetary assets and liabilities of these subsidiaries to U.S. dollars using rates of exchange in effect at the balance sheet date. Nonmonetary assets and liabilities are re-measured to U.S. dollars using historical exchange rates, and other accounts are re-measured using average exchange rates in effect during each period presented. The effects of foreign currency translation adjustments are included in stockholders’ equity as a component of accumulated other comprehensive loss on the accompanying consolidated balance sheets, and related periodic movements are summarized as a line item in the consolidated statements of operations.

The Company records net gains and losses resulting from foreign exchange transactions as a component of other expenses, net. Aggregate foreign currency losses included in determining net loss were $490, $332 and $88 during 2014, 2013 and 2012, respectively.

Income Taxes

The Company accounts for income taxes using the asset and liability method. Under this method, deferred tax assets and liabilities are determined based on differences between the financial statement and tax basis of assets and liabilities and net operating loss and credit carryforwards using enacted tax rates in effect for the year in which the differences are expected to reverse. Valuation allowances are established when necessary to reduce deferred tax assets to the amounts expected to be realized.

The Company accounts for unrecognized tax benefits using a more-likely-than-not threshold for financial statement recognition and measurement of tax positions taken or expected to be taken in a tax return. The Company establishes a liability for tax-related uncertainties based on estimates of whether, and the extent to which, additional taxes will be due. The Company records an income tax liability, if any, for the difference between the benefit recognized and measured and the tax position taken or expected to be taken on the Company’s tax returns. To the extent that the assessment of such tax positions changes, the change in estimate is recorded in the period in which the determination is made. The liability is adjusted in light of changing facts and circumstances, such as the outcome of a tax audit. The provision for income taxes includes the impact of liability provisions and changes to the liabilities that are considered appropriate. The Company recognizes interest and penalties related to unrecognized tax benefits as income tax expense. As the Company maintained a full valuation allowance against its deferred tax assets in the United States, the adjustments resulted in no additional tax expense in 2014. Based on the Company’s assessment of many factors, the Company does not expect that changes in the liability for unrecognized tax benefits for the next twelve months will have a significant impact on the Company’s consolidated financial position or results of operations.

Recent Accounting Pronouncements

In August 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-15, Disclosures of Uncertainties About an Entity’s Ability to Continue as a Going Concern. The new standard provides guidance around management’s responsibility to evaluate whether there is substantial doubt about an entity’s ability to continue as a going concern and to provide related footnote disclosures. The new standard is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2016. Early adoption is permitted. The Company does not expect that this guidance will have a material impact on its consolidated results of operations or financial condition.

In June 2014, the FASB issued ASU 2014-12, Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period. The guidance requires that a performance target that affects vesting and could be achieved after the requisite service period be treated as a performance condition. A reporting entity should apply existing guidance as it relates to such awards. This guidance is effective for us in our first quarter of fiscal year ending December 31, 2017. We are currently evaluating the impact of our pending adoption of this ASU on the Company’s consolidated financial statements.

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers, which provides guidance for revenue recognition. The standard’s core principle is that a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. In doing so, companies will need to use more judgment and make more estimates when compared with the current guidance. These may include identifying performance obligations in the contract, estimating the amount of variable consideration to include in the transaction price and allocating the transaction price to each separate performance obligation. This guidance will be effective for the Company in the first quarter of its fiscal year ending December 31, 2017. The Company is currently in the process of evaluating the impact of pending adoption of this ASU on the Company’s consolidated financial statements.

In July 2013, the FASB issued a new accounting standard update on the financial statement presentation of unrecognized tax benefits. The new guidance provides that a liability related to an unrecognized tax benefit would be presented as a reduction of a deferred tax asset for a net operating loss carryforward, a similar tax loss or a tax credit carryforward if such settlement is required or expected in the event the uncertain tax position is disallowed. The Company adopted the standard update in the first quarter of 2014, and its adoption had no impact on the Company’s consolidated results of operations or financial condition.

Business_Combination

Business Combination	12 Months Ended
Business Combination	Dec. 31, 2014
Business Combinations [Abstract]
Business Combination	3. Business Combination
	On June 2, 2014, pursuant to the terms of an Agreement and Plan of Reorganization, a wholly-owned subsidiary of the Company merged with and into NowSpots, Inc., which conducted business as Perfect Audience (“Perfect Audience”), with Perfect Audience surviving as a wholly-owned subsidiary of the Company. Perfect Audience specializes in display and social network advertisement re-targeting, and its programmatic display and social advertising functions will expand the Company’s cross-channel capabilities.
	The acquisition was accounted for under the acquisition method of accounting in which the tangible and identifiable intangible assets and liabilities of Perfect Audience were recorded at their respective fair values as of the acquisition date, including an amount for goodwill representing the difference between the respective acquisition consideration and fair values of identifiable net assets. The fair value of assets acquired and liabilities assumed was recorded based on a preliminary valuation and the Company’s estimates and assumptions are subject to change within the measurement period. The primary areas of the purchase price allocation that are not yet finalized are related to the fair values of liabilities assumed and residual goodwill.
	The total purchase price for the acquisition was $16,470, which consisted of 1,119 shares of the Company’s common stock valued at $11,195 upon the closing date using the Company’s closing date stock price, and $5,275 in cash. Of the total purchase price, $4,711 was attributed to fair value of net liabilities assumed, $1,124 was cash acquired, and $8,530 was the fair value of intangible assets acquired with $11,527 as residual goodwill. The goodwill is primarily attributable to the synergies expected to arise after the acquisition and is not expected to be deductible for tax purposes.
	In addition, the Company issued 630 shares of common stock (with a closing date fair value of $6,301) to existing Perfect Audience employees in connection with the acquisition, which vest over a range of two to three years upon such employees’ continuous employment with the Company. These shares have been excluded from the purchase consideration and will be recognized as post-acquisition stock-based compensation expense. The Company recognizes compensation expense equal to the grant date fair value of the common stock on a straight-line basis over the employee’s requisite service period.
	The following table summarizes the fair values of tangible assets acquired, liabilities assumed, intangible assets and goodwill:


		Estimated			Estimated
		Fair Value			Useful Life
	Tangible assets acquired	$	1,492		N/A
	Liabilities assumed		(5,079	)	N/A
	Developed technology		6,110		6 years
	Customer relationships		1,290		4 years
	Non-compete agreements and tradename		1,130		2 - 3 years
	Goodwill		11,527		Indefinite

	Total purchase price	$	16,470

	The revenues, net and earnings attributable to Perfect Audience included in our consolidated financial statements since the acquisition date are not material. Actual and pro forma results of the operations have not been presented because the effects are not material to the consolidated financial statements.

Balance_Sheet_Components

Balance Sheet Components	12 Months Ended
Balance Sheet Components	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Balance Sheet Components	4. Balance Sheet Components
	The following table shows the components of property and equipment as of the dates presented:


		December 31,
		2014			2013

	Computer equipment	$	21,422		$	16,314
	Software		11,022			7,690
	Office equipment		795			571
	Furniture, fixtures and leasehold improvements		2,092			1,861

			35,331			26,436
	Less: Accumulated depreciation and amortization		(19,057	)		(12,019	)

		$	16,274		$	14,417

	Depreciation and amortization of internally developed software for 2014, 2013 and 2012 was $7,574, $5,878, and $3,167, respectively.
	The following table shows the components of accrued expenses and other current liabilities as of the dates presented:


		December 31,
		2014			2013
	Accrued salary and payroll related expenses	$	6,017		$	6,675
	Accrued accounts payable		3,709			2,773
	Customer advances		1,366			—
	Income tax payable		377			434
	Sales and use tax payable		263			466
	Other		321			602

		$	12,053		$	10,950

Goodwill_and_Intangible_Assets

Goodwill and Intangible Assets	12 Months Ended
Goodwill and Intangible Assets	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	5. Goodwill and Intangible Assets
	The goodwill balance as of December 31, 2014 totaling $11,527 was the result of the business acquisition disclosed in Note 3 of these consolidated financial statements.
	Intangible assets consisted of the following as of the dates presented:


		December			Estimated
		31, 2014			Useful Life
	Developed technology	$	6,110		6 years
	Customer relationships		1,290		4 years
	Non-compete agreements and tradename		1,130		2-3 years

			8,530
	Less: accumulated amortization		(1,131	)

		$	7,399

	Amortization expense of intangible assets was $1,131 for 2014, and zero for the comparative periods presented.
	Future estimated amortization of intangible assets as of December 31, 2014 is presented below:


	Year ending December 31, 2015	$	1,938
	Year ending December 31, 2016		1,714
	Year ending December 31, 2017		1,483
	Year ending December 31, 2018		1,245
	Year ending December 31, 2019		1,019

		$	7,399

Fair_Value_Measurements

Fair Value Measurements	12 Months Ended
Fair Value Measurements	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Fair Value Measurements	6. Fair Value Measurements
	Account balances measured at fair value on a recurring basis include the following as of December 31, 2014 and 2013:


		December 31,
		2014							2013
		Level 1			Level 2		Level 3		Level 1		Level 2		Level 3
	Cash equivalents
	Money market funds	$	58,027		$	—	$	—	$	98,987	$	—	$	—
	The following table presents the changes in the preferred stock warrant obligation measured and recorded at fair value on a recurring basis, using significant unobservable inputs (Level 3) during 2013 and 2012. There were no changes in the preferred stock warrant obligation during 2014, as the underlying warrants were no longer outstanding subsequent to the Company’s IPO.


		Years Ended December 31,
		2013			2012
	Balances at beginning of year	$	507		$	145
	Change in unrealized loss included in earnings		238			362
	Conversion to common stock warrant		(745	)		—

	Balances at end of year	$	—		$	507

	The Company’s cash equivalents as of December 31, 2014 and 2013 consisted of money market funds with original maturity dates of less than three months from the date of their respective purchase. Cash equivalents are classified as Level 1. The fair value of the Company’s money market funds approximated amortized cost and, as such, there were no unrealized gains or losses on money market funds as of December 31, 2014 and 2013. As of December 31, 2014 and 2013, amounts of $10,226 and $5,420, respectively, were held in bank deposits.

Debt

Debt	12 Months Ended
Debt	Dec. 31, 2014
Debt Disclosure [Abstract]
Debt	7. Debt
	Loan and Security Agreement and Warrant
	In connection with a Loan and Security Agreement entered into with Silicon Valley Bank in 2008, the Company issued a warrant to purchase 51 shares of Series B preferred stock at $2.7563 per share. This warrant was to expire on the later date of October 30, 2018, or five years from the closing of the Company’s IPO. The fair value of the warrant was estimated at an aggregate of $72 using the Black-Scholes valuation model with the following assumptions: expected volatility of 53%, risk free interest rate of 4.85%, expected life of 10 years and no dividends. The fair value of the warrant was recorded as a discount to the loan and was amortized to interest expense over the loan term.
	Revolving Credit Facility, Equipment Advance Facilities and Warrants
	In January 2010, the Company signed an amendment to the Loan and Security Agreement, which provided for a revolving credit facility (the “Revolving Credit Facility”). In January 2011, the Company entered into an amendment to the Revolving Credit Facility pursuant to which Silicon Valley Bank agreed to extend an equipment advance facility of $2,000 (the “Equipment Advance Facility”). The Equipment Advance Facility could only be used to finance the purchase of equipment, accrued interest at a fixed per annum rate of 5.5%, was repayable in 36 consecutive monthly installments of principal and interest and expired on December 1, 2014. The Equipment Advance Facility was fully off on that date.

	In December 2011, the Company entered into another amendment to its existing Revolving Credit Facility pursuant to which Silicon Valley Bank agreed to extend an additional equipment advance facility of $2,000 (the “Additional Equipment Advance Facility”). The Additional Equipment Advance Facility may only be used to finance the purchase of equipment. The Additional Equipment Advance Facility accrues interest at a fixed per annum rate of 5.5% and will be repayable in 36 consecutive monthly installments of principal and interest. The Additional Equipment Advance facility expires September 1, 2015. As of December 31, 2014, the Company had withdrawn the full amount available under the Additional Equipment Advance Facility. In connection with the Additional Equipment Advance Facility, the Company issued a warrant to Silicon Valley Bank to purchase 37 shares of common stock at $2.70 per share. This warrant would expire on November 30, 2021. The fair value of the warrant was estimated at an aggregate of $139 using the Black-Scholes valuation model with the following assumptions: expected volatility of 57%; risk-free interest rate of 2.1%; expected life of 10 years; and no dividends. The fair value of the warrant was recorded as a discount to the loan and was amortized to interest expense over the loan term.
	In December 2012, the Company entered into an amendment to its existing Revolving Credit Facility and Equipment Advance Facility pursuant to which Silicon Valley Bank agreed to extend an additional equipment advance facility of $3,000 (the “Supplemental Equipment Advance”). The Supplemental Equipment Advance may only be used to finance the purchase of equipment. The Supplemental Equipment Advance accrues interest at a fixed per annum rate of 3.0% and will be repayable in 33 consecutive monthly installments of principal and interest. The Supplemental Equipment Advance expires March 1, 2016. As of December 31, 2014, the Company had withdrawn the full amount available under the Supplemental Equipment Advance. In connection with the Supplemental Equipment Advance, the Company issued a warrant to Silicon Valley Bank to purchase 27 shares of common stock at $12.15 per share. This warrant was to expire in December 2022.
	The fair value of the warrant was estimated at an aggregate of $213 using the Black-Scholes valuation model with the following assumptions: expected volatility of 57%; risk-free interest rate of 1.65%; expected life of 10 years; and no dividends. The fair value of the warrant was recorded as a discount to the Revolving Credit Facility and will be amortized to interest expense over the facility term. Together with the Series B convertible preferred stock warrant and the common stock warrants issued, a total of $251 and $159 was recognized as interest expense for 2013 and 2012, respectively, as a result of the amortization of the loan discounts. In May 2013, Silicon Valley Bank exercised the preferred stock warrant and common stock warrants using the cashless exercise feature, resulting in the net issuance of 68 shares of common stock. As a result, no such interest expense was recognized in 2014.
	In September 2013, the Company entered into an amendment to the Revolving Credit Facility pursuant to which Silicon Valley Bank agreed to increase the Revolving Credit Facility to the lesser of $15,000 or 80% of the Company’s eligible accounts receivable. Also, the expiration date of the Revolving Credit Facility was extended to July 31, 2015 and the annual interest rate was amended to 0.25% over the Prime Rate, payable on a monthly basis. Additionally, the Company’s obligation to meet certain financial covenants will be waived when the Company’s unrestricted cash balance exceeds $50,000. As of December 31, 2014, approximately $13,900 was available for withdrawal under the Revolving Credit Facility. No amounts were outstanding pursuant to the Revolving Credit Facility as of December 31, 2014 and 2013. The Revolving Credit Facility, the Additional Equipment Advance Facility and the Supplemental Equipment Advance are all collateralized with all of the personal property of the Company, excluding shares of controlled foreign corporations, patents and copyrights.
	Capital Lease Arrangement
	In February 2013, the Company entered into a capital lease arrangement with an equipment manufacturer to finance the acquisition of computer equipment. The lease has an effective interest rate of 6.0% and is repayable in 36 consecutive equal monthly installments of principal and interest. At the end of the lease period, the Company has the option to purchase the equipment at the estimated fair market value. As of December 31, 2014, the net book value of the equipment under the capital lease was $1,439 and the remaining principal balance payable was $1,542. The capital lease is collateralized by the underlying computer equipment.
	The Company’s outstanding balances under the capital lease and Equipment Advance Facilities as of December 31, 2014 and 2013 are as follows:


		December 31,
		2014			2013
	Capital lease	$	1,542		$	2,598
	Equipment Advance Facilities		1,697			3,771

			3,239			6,369
	Discount on long-term debt		(31	)		(154	)

		$	3,208		$	6,215

	The maturities of debt as of December 31, 2014 are as follows:


	Years Ending
	2015	$	2,587
	2016		652

			3,239
	Less:
	Current portion		(2,587	)
	Discount on long-term debt		(31	)

	Noncurrent portion of debt	$	621

	In December 2014, the Company entered into a standby letter of credit for $1,293 with Silicon Valley Bank in connection with the non-cancelable lease for the Company’s corporate headquarters in San Francisco. This standby letter of credit does not impact the balances available for withdrawal under the Revolving Credit Facility, the Additional Equipment Advance Facility and the Supplemental Equipment Advance. As of December 31, 2014, no amount was drawn on this standby letter of credit.
	Outstanding warrants to purchase the Company’s Series B preferred stock were classified as liabilities which were adjusted to fair value at each reporting period until the earlier of their exercise or expiration on the later date of October 30, 2018 or five years from the closing of the Company’s IPO, or the completion of a liquidation event, including the completion of an IPO, at which time the preferred stock warrant liability was automatically converted into a warrant to purchase shares of common stock and was reclassified to stockholders’ equity. The Company recorded a loss of $238 and $362 for 2013 and 2012, respectively, within other income (expenses), net to adjust the warrant liability to fair value. The fair values were determined using Level 3 inputs under the GAAP fair value hierarchy. No such fair value adjustment was recorded in 2014, as the as the underlying warrants were no longer outstanding subsequent to the Company’s IPO.

Convertible_Preferred_Stock

Convertible Preferred Stock	12 Months Ended
Convertible Preferred Stock	Dec. 31, 2014
Equity [Abstract]
Convertible Preferred Stock	8. Convertible Preferred Stock
	Immediately prior to the close of the Company’s IPO, the Company’s outstanding convertible preferred stock (“Series A Stock,” “Series A-1 Stock,” “Series B Stock,” “Series C Stock,” “Series D Stock,” “Series E Stock,” “Series F Stock” and “Series F-1 Stock”) automatically converted at a rate of 1:1 into common stock. The following table summarizes information related to the Company’s convertible preferred stock prior to conversion into common stock:


		Shares		Shares		Liquidation		Proceeds
		Authorized		Outstanding		Amount		Net of
								Issuance
								Cost
	Series A		2,009		2,009	$	2,248	$	2,208
	Series A-1		1,400		1,400		2,329		2,273
	Series B		2,673		2,622		7,227		7,146
	Series C		4,673		4,673		12,999		12,915
	Series D		2,022		2,022		11,192		11,038
	Series E		1,744		1,744		16,036		15,934
	Series F		2,805		2,805		34,488		34,294
	Series F-1		1,478		1,478		20,000		19,902

			18,804		18,753	$	106,519	$	105,710

	Dividends
	No dividends on the convertible preferred stock were declared by the Board of Directors from inception through their conversion into common stock.
	Issuance of Preferred Stock
	Concurrent with primary issuance of Series F Stock in January 2012, the Company also entered into an agreement with certain executives of the Company to repurchase certain common stock held by them, whereby the Company repurchased 365 shares of their common stock in the Company at the Series F preferred stock issuance price of $12.30 per share for an aggregate price of $4,488. At the date of the repurchase, the aggregate estimated fair value of the repurchased common stock was $1,898. As a result of this arrangement, the Company recorded stock-based compensation expense of $2,590 during 2012. Of this amount, $364, $317 and $1,909 were recorded as sales and marketing, research and development and general and administrative expenses, respectively, in the accompanying statements of comprehensive loss for the year ended December 31, 2012.

Common_Stock

Common Stock	12 Months Ended
Common Stock	Dec. 31, 2014
Equity [Abstract]
Common Stock	9. Common Stock
	On February 12, 2013, the Company’s Board of Directors approved a Restated Certificate of Incorporation, which became effective upon the consummation of the Company’s IPO. The Restated Certificate of Incorporation amends the authorized share capital to 500,000 shares of common stock ($0.001 par value per share) and 10,000 shares of blank-check preferred stock ($0.001 par value per share).

	As of December 31, 2014 and 2013, reserved shares of common stock are as follows:


		December 31,
		2014		2013
	Options available for future grant under stock option plans		3,154		4,585
	Options outstanding under stock option plans		6,376		4,855
	RSUs outstanding under stock option plans		769		—
	Shares available for future issuance under ESPP		1,005		854

			11,304		10,294

	During 2012, the Company entered into common stock purchase agreements (“CSPAs”) with two members of the Board of Directors. In connection with the CSPAs, the Company sold 84 shares of common stock for a cumulative purchase price of $500. The underlying shares vested ratably on a monthly basis over 24 months. The CSPAs included a repurchase feature which provides the Company the option, but not the obligation, to repurchase any unvested shares upon termination at the original purchase price. As of December 31, 2014, all of the common shares issued under the CSPAs were vested.

Equity_Award_Plans

Equity Award Plans	12 Months Ended
Equity Award Plans	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Equity Award Plans	10. Equity Award Plans
	In April 2006, the Company’s Board of Directors adopted and the stockholders approved the 2006 Stock Option Plan (“2006 Plan”). The 2006 Plan provides for the grant of incentive stock options under the federal tax laws and non-statutory stock options. Only employees may receive incentive stock options, but non-statutory stock options may be granted to employees, non-employee directors and consultants. The stock options are exercisable at a price equal to the market value of the underlying shares of common stock on the date of the grant as determined by the Company’s board of directors. The term of options granted under the 2006 Plan may not exceed ten years. Certain options are eligible for exercise prior to vesting. Exercised but unvested shares of common stock are subject to repurchase by the Company at the initial exercise price. The proceeds from the shares of common stock subject to repurchase are classified as a liability and reclassified to equity as the shares vest. Under the 2006 Plan’s early exercise feature, the Company had the right to repurchase 85 and 180 shares of common stock as of December 31, 2014 and 2013, respectively. The Company records cash received from the exercise of unvested stock options as a long-term liability, as well as the fair value of vested outstanding options to non-employee consultants. As of December 31, 2014 and 2013, $826 and $1,215, respectively, has been recorded as a long-term liability on the accompanying consolidated balance sheets.
	In February 2013, the Company’s Board of Directors and stockholders approved the 2013 Equity Incentive Plan (“2013 Plan”), under which 4,500 shares of common stock were originally reserved for issuance. Additionally, all reserved and unissued shares under the 2006 Plan at the time the 2013 Plan became effective are eligible for issuance under the 2013 Plan. The 2013 Plan became effective on March 21, 2013, at which time the Company ceased to grant equity awards under the 2006 Plan. The 2013 Equity Incentive Plan authorizes the award of stock options, restricted stock awards, stock appreciation rights, RSUs, performance awards and stock bonuses to the Company’s employees, directors, consultants, independent contractors and advisors. On January 1 of each of the first 10 calendar years through 2023, the number of shares of common stock reserved under the 2013 Equity Incentive Plan will automatically increase by an amount equal to 5% of the total outstanding shares as of immediately preceding December 31, or such lesser number of shares as determined by the Company’s Board of Directors. Pursuant to terms of the 2013 Plan, the shares available for issuance increased by approximately 1,648 shares of common stock on January 1, 2014.

	Stock Options
	Under the 2006 Plan and the 2013 Plan, the term of options granted may not exceed ten years. Unless the terms of an optionee’s stock option agreement provide otherwise, if an optionee’s service relationship with the Company, or any of its affiliates, ceases for any reason other than disability or death, the optionee may exercise the vested portion of any options for three months after the date of such termination. If an optionee’s service relationship with the Company, or any of its affiliates, ceases due to disability or death (or an optionee dies within a certain period following cessation of service), the optionee or a beneficiary may exercise any vested options for a period of 12 months. In no event, however, may an option be exercised beyond the expiration of its term.
	A summary of activity under the 2006 Plan and the 2013 Plan is as follows:


			Options Outstanding
			Number of				Weighted		Weighted		Aggregate
			Shares				Average		Average		Intrinsic
							Exercise		Remaining		Value
							Price		Contractual
									Term
									(in Years)
	Balances at December 31, 2011			3,000			$	1.71		6.23	$	10,575

	Options granted			2,046				7.48		8.34
	Options exercised			(518	)			3.23		—
	Options forfeited and cancelled			(214	)			3.66		—

	Balances at December 31, 2012			4,314				1.71		7.11	$	34,439

	Options granted			1,594				11.98		9.26
	Options exercised			(618	)			2.42		—
	Options forfeited and cancelled			(435	)			8.6		—

	Balances at December 31, 2013			4,855				6.56		7.85	$	20,593

	Options granted			3,558				9.39		8.35
	Options exercised			(791	)			3.12		—
	Options forfeited and cancelled			(1,246	)			9.51		—

	Balances at December 31, 2014			6,376			$	7.99		7.82	$	9,697

	Options exercisable as of December 31, 2014			2,887			$	6.11		5.91	$	9,501

	Options vested as of December 31, 2014			2,331			$	5.35		5.49	$	8,987

	Options vested and expected to vest as of December 31, 2014			5,985			$	7.89		7.72	$	9,660

	The intrinsic value of options exercised during 2014, 2013 and 2012 was $5,615, $5,693, and $2,266, respectively. The total estimated fair value of options vested during 2014, 2013 and 2012 was $5,447, $3,110, and $1,572, respectively.

	The following table summarizes information about shares subject to stock options outstanding as of December 31, 2014:


			Options Outstanding
	Range of Exercise Prices		Number				Weighted
			Outstanding				Average
							Remaining
							Contractual
							Life (in years)
	$0.14 – $0.82			468				2.74
	$2.39 – $2.70			770				5.47
	$5.20 – $7.76			1,044				7.25
	$8.17 – $9.87			2,858				9.49
	$10.30 – $11.82			448				8.86
	$12.12 – $14.18			788				7.43

				6,376

	RSUs
	A summary of RSUs granted and unvested under the 2013 Plan as of December 31, 2014 is as follows:


		RSUs Outstanding
		Number of				Weighted Average
		RSUs				Fair Value
						Per Unit
Granted and unvested at December 31, 2013			—			$	—
RSUs granted			777				9.37
RSUs vested			—				—
RSUs forfeited			(8	)			10.56

Granted and unvested at December 31, 2014			769			$	9.36

Employee Stock Purchase Plan
In February 2013, the Company’s Board of Directors and stockholders approved the 2013 Employee Stock Purchase Plan (“2013 ESPP”), under which 1,000 shares of common stock were originally reserved for issuance. The 2013 ESPP became effective on March 22, 2013. The 2013 ESPP provides generally for six-month purchase periods and the purchase price for shares of common stock purchased under the 2013 Employee Stock Purchase Plan will be 85% of the lesser of the fair market value of the common stock on (i) the first trading day of the applicable offering period and (ii) the last trading day of each purchase period in the applicable offering period. On January 1 of each of the first 10 calendar years following the first offering date, the number of shares reserved under the 2013 Employee Stock Purchase Plan will automatically increase by an amount equal to 1% of the total outstanding shares as of immediately preceding December 31, but not to exceed 700 shares. Pursuant to terms of the 2013 ESPP, the shares available for issuance increased by approximately 329 shares on January 1, 2014. During 2014 and 2013, 178 and 146 shares, respectively, were issued under the 2013 ESPP.

StockBased_Compensation

Stock-Based Compensation	12 Months Ended
Stock-Based Compensation	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	11. Stock-Based Compensation
	For stock-based awards granted by the Company, stock-based compensation cost is measured at grant date based on the fair value of the award and is expensed over the requisite service period. The Company recorded stock-based compensation of $9,242, $5,218 and $4,948 for 2014, 2013 and 2012, respectively.

	Stock Options
	The Company uses the Black-Scholes option pricing model to estimate the fair value of options. This model requires the input of highly subjective assumptions including the expected volatility, risk-free interest rate, and the expected life of options. The Company used the following assumptions:


		Years Ended December 31,
		2014			2013			2012
	Dividend yield		—			—			—
	Expected volatility		51.3	%		55	%		57	%
	Risk-free interest rate		1.89	%		1.27	%		0.95	%
	Expected life of options (in years)		6.25			6.25			6.25
	Forfeiture rate		7	%		7	%		3.2% –7.0%
	Weighted-average grant-date fair value	$	4.77		$	6.41		$	4.37
	Weighted-average grant-date exercise price	$	9.39		$	11.98		$	7.48
	As the Company has limited historical option exercise data, the expected term of the stock options granted to employees was calculated based on the simplified method. Under the simplified method, the expected term is equal to the average of an option’s weighted-average vesting period and its contractual term. Pursuant to the SEC Staff Accounting Bulletin (“SAB”) No. 110, the Company is permitted to continue using the simplified method until sufficient information regarding exercise behavior, such as historical exercise data or exercise information from external sources, becomes available. The Company estimates the expected volatility of its common stock on the date of grant based on the historical stock volatilities of similar publicly-traded entities over a period equal to the expected terms of the options, as the Company does not have sufficient trading history to use the volatility of its own common stock. The Company has no history or expectation of paying cash dividends on its common stock. The risk-free interest rate is based on the U.S. Treasury yield for a term consistent with the expected life of the options in effect at the time of grant.
	Cash proceeds from the exercise of stock options were $2,472, $1,541, and $1,624 during 2014, 2013 and 2012, respectively.
	Compensation expense is recognized ratably over the requisite service period. As of December 31, 2014 and 2013, there was $16,112 and $11,597, respectively, of unrecognized compensation cost related to options, which is expected to be recognized over a weighted-average period of 3.0 and 2.7 years, respectively.
	Prior to the consummation of the IPO, given the lack of an active public market for the Company’s outstanding Common and preferred stock, the Company’s Board of Directors established an estimate of fair value for these securities as well as for options and warrants to purchase these securities. The fair value of the Company’s common stock as used in the determination of the exercise price of stock options was estimated by the Board of Directors based on factors such as the liquidation preference, dividends and other rights of the outstanding preferred stock; recent financial and operating performance; the status of the Company’s development and sales efforts, revenue growth and additional objectives; the likelihood and proximity of an initial IPO; and the valuation of comparable companies that are publicly traded. Subsequent to the closing of the Company’s IPO, the Company has used the closing price of the Company’s common stock on the date of the stock option grant as the fair value of the Company’s common stock and the exercise price of the stock options.
	For awards that are expected to result in a tax deduction, a deferred tax asset is established as the Company recognizes compensation expense. If the tax deduction exceeds the cumulative recorded compensation expense, the tax benefit associated with the excess deduction is considered a windfall benefit. The excess tax benefit from share compensation plans is recorded in additional paid-in capital and classified as a financing cash flow on the consolidated statements of cash flows. The Company has elected to use the “with and without” approach as described in Accounting Standards Codification 740-20, “Intraperiod Tax Allocation,” in determining the order in which tax attributes are utilized. As a result, the Company will only recognize a tax benefit from stock-based awards in additional paid-in capital if an incremental tax benefit is realized after all other tax attributes currently available to the Company have been utilized.
	Restricted Stock and RSUs
	As of December 31, 2014, there was $9,459 of unrecognized compensation cost related to restricted stock and RSUs, which is expected to be recognized over a weighted-average period of 2.2 years. The Company uses the fair market value of the underlying common stock on the dates of grant to determine the fair value of restricted stock and RSUs. Stock-based compensation expense related to these awards is recognized on a straight-line basis over the service period of the award for the estimated number of shares that are ultimately expected to vest.
	Employee Stock Purchase Plan
	The Company estimates the fair value of purchase rights under the ESPP using the Black-Scholes valuation model. The fair value of each purchase right under the ESPP was estimated on the date of grant using the Black-Scholes option valuation model and the straight-line attribution approach with assumptions substantially similar to those used for the valuation of our stock option awards.

Income_Taxes

Income Taxes	12 Months Ended
Income Taxes	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Taxes	12. Income Taxes
	The components of the Company’s loss before (benefit from) provision for income taxes were as follows:


			Years Ended December 31,
			2014				2013			2012
	United States of America		$	(26,427	)		$	(24,197	)	$	(27,423	)
	International			(8,200	)			(11,163	)		1,162

			$	(34,627	)		$	(35,360	)	$	(26,261	)

	The components of the (benefit from) provision for income taxes were as follows:


			Years Ended December 31,
			2014				2013			2012
	Current income tax provision
	Federal		$	—			$	—		$	—
	State			101				26			19
	Foreign			700				557			310

	Total current income tax provision			801				583			329

	Deferred income tax (benefit) provision
	Federal			(2,094	)			—			—
	State			(191	)			—			—
	Foreign			28				(91	)		(108	)

	Total deferred income tax (benefit) provision			(2,257	)			(91	)		(108	)

	(Benefit from) provision for income taxes		$	(1,456	)		$	492		$	221


	The Company has incurred operating losses and has recorded a full valuation allowance against its deferred tax assets (except for the deferred tax assets associated with the Company’s subsidiary in the United Kingdom) for all periods to date and, accordingly, has not recorded a provision for income taxes for any of the periods presented other than provisions for foreign and state income taxes.
	The differences in the total (benefit from) provision for income taxes that would result from applying the 34% federal statutory rate to loss before provision for income taxes and the reported provision for income taxes were as follows:


			Years Ended December 31,
			2014				2013			2012
	Tax benefit at U.S. statutory rate		$	(11,773	)		$	(12,022	)	$	(8,929	)
	State income taxes, net of federal benefit			(105	)			19			19
	Foreign income and withholding taxes			3,593				4,382			(184	)
	Stock-based compensation			984				863			458
	Change in valuation allowance			5,982				4,437			9,082
	Research and development credits			(807	)			(776	)		(823	)
	Uncertain tax positions			52				1,499			—
	Provision to return adjustments			(53	)			1,894			328
	Other			671				196			270

			$	(1,456	)		$	492		$	221

	Major components of the Company’s deferred tax assets as of December 31, 2014 and 2013 are as follows:


			December 31,
			2014				2013
	Current
	Accruals and reserves		$	1,250			$	1,816
	Stock-based compensation			586				151
	Other			118				(64	)

	Current deferred tax assets			1,954				1,903
	Valuation allowance			(1,822	)			(1,853	)

Total current deferred tax asset, net of valuation allowance			132				50

Noncurrent
Net operating loss			34,586				27,355
Accruals and reserves			128				149
Research and development credits			4,791				3,391
Stock-based compensation			1,757				452
Property and equipment and intangible assets			543				914
Other			(235	)			94

Noncurrent deferred tax assets			41,570				32,355
Valuation allowance			(41,531	)			(32,205	)

Total non-current deferred tax asset, net of valuation allowance		$	39			$	150


As a result of certain realization requirements of accounting guidance for stock compensation, the table of deferred tax assets and liabilities shown above does not include certain deferred tax assets at December 31, 2014, and 2013 that arose directly from tax deductions related to equity compensation in excess of compensation recognized for financial reporting. Additional paid-in capital will be increased by $1,109 if and when such benefits are ultimately realized and reduce taxes payable.
The Code, as amended, imposes restrictions on the utilization of net operating losses in the event of an “ownership change” of a corporation. Accordingly, a company’s ability to use net operating losses may be limited as prescribed under Internal Revenue Code Section 382 (“IRC Section 382”). Events which may cause limitations in the amount of the net operating losses that the Company may use in any one year include, but are not limited to, a cumulative ownership change of more than 50% over a three-year period. Utilization of the federal and state net operating losses may be subject to substantial annual limitation due to the ownership change limitations provided by the IRC Section 382 and similar state provisions. An analysis was conducted through December 31, 2014 to determine whether an ownership change had occurred since inception. The analysis indicated that because an ownership change occurred in a prior year, federal and state net operating losses of $184 and $214, respectively, were significantly limited pursuant to IRC Section 382. In the event the Company has subsequent changes in ownership, net operating losses and research and development credit carryovers could be further limited and may expire unutilized.
As of December 31, 2014, the Company had federal and state net operating loss carryforwards of approximately $99,779 and $85,288, respectively. The federal net operating loss carryforward will begin expiring in 2026 and the state net operating loss carryforward will begin expiring in 2016. As of December 31, 2014, the Company had federal and state research and development credits of approximately $3,938 and $3,497, respectively. The federal research and development credits will begin expiring in 2026. The state research and development credits are not currently subject to expiration. On January 2, 2013, the American Taxpayer Relief Act of 2012 was signed into law. As part of the act, the research and development credit was retroactively extended. Accordingly, the Company did not record a federal research and development credit for 2012. While the applicable credit for 2012 was considered in 2014 and 2013, no financial statement benefit was recorded as the Company applies a valuation allowance against the credit generated.
The Company has recorded a full valuation allowance against its otherwise recognizable deferred income tax assets as of December 31, 2014 and 2013 (except for the deferred income tax assets associated with the Company’s subsidiary in the United Kingdom). The Company has determined, after evaluating all positive and negative historical and prospective evidence, that it is more likely than not that the deferred tax assets will not be realized. The valuation allowance increased by $9,295, $4,205 and $10,951 during the years ended December 31, 2014, 2013 and 2012, respectively.
The Company files U.S. state and foreign income tax returns in jurisdictions with varying statutes of limitations. In the normal course of business, the Company is subject to examination by taxing authorities throughout the world. These audits include questioning the timing and amount of deduction, the nexus of income among various tax jurisdictions and compliance with state, local and foreign tax laws. The Company is not currently under any examination by the U.S. state or foreign tax authorities. Because of net operating loss and credit carry forwards, all of the Company’s tax years dating to inception in 2007 remain open to examination.
As of December 31, 2014 and 2013, the Company did not have any unrecognized tax benefits that if recognized would impact the annual effective tax rate. During 2014, 2013 and 2012, the Company did not recognize any interest or penalties related to unrecognized tax benefits. The aggregate changes in the balance of gross unrecognized tax benefits were as follows:


Beginning balance as of January 1, 2014		$	1,088
Increase in balances related to tax positions taken during the current period			394
Increase in balances related to tax positions taken during the prior period			99

Ending balance as of December 31, 2014		$	1,581

The Company does not anticipate that the amount of unrecognized tax benefits relating to tax positions existing at December 31, 2014 will significantly increase or decrease within the next twelve months.
U.S. income taxes and foreign withholding taxes associated with the repatriation of earnings of foreign subsidiaries were not provided for on a cumulative total of $1,292 of undistributed earnings for certain foreign subsidiaries as of December 31, 2014. The Company intends to reinvest these earnings indefinitely in its foreign subsidiaries. If these earnings were distributed to the United States in the form of dividends or otherwise, or if the shares of the relevant foreign subsidiaries were sold or otherwise transferred, the Company would be subject to additional U.S. income taxes (subject to an adjustment for foreign tax credits) and foreign withholding taxes. Determination of the amount of unrecognized deferred income tax liability related to these earnings is not practicable.

Net_Loss_Per_Share_Available_t

Net Loss Per Share Available to Common Stockholders	12 Months Ended
Net Loss Per Share Available to Common Stockholders	Dec. 31, 2014
Earnings Per Share [Abstract]
Net Loss Per Share Available to Common Stockholders	13. Net Loss Per Share Available to Common Stockholders
	Basic net loss per share available to common stockholders is calculated by dividing the net loss available to common stockholders by the weighted-average number of shares of common stock outstanding for the period. Net loss available to common stockholders is calculated using the two class method as net loss less the preferred stock dividend for the period less the amount of net loss, if any, allocated to the preferred stock based on weighted preferred stock outstanding during the period relative to total stock outstanding during the period. As the Company’s preferred stockholders did not have the contractual obligations to share in the losses of the Company, no loss was allocated to the convertible preferred stockholders in the determination of net loss available to common stockholders. The weighted-average number of shares of common stock used to calculate the Company’s basic net loss per share available to common stockholders excludes those shares subject to repurchase related to unvested common shares, stock options that were exercised prior to vesting, restricted stock issued and RSUs settled for shares of common stock as these shares are not deemed to be outstanding for accounting purposes until they vest. The diluted net loss per share of common stock is computed by dividing the net loss using the weighted-average number of shares of common stock, excluding common stock subject to repurchase, and, if dilutive, potential shares of common stock outstanding during the period. Potential shares of common stock consist of common stock subject to repurchase, stock options to purchase common stock, restricted common stock issued, RSUs settled for shares of common stock, warrants to purchase convertible preferred stock (using the treasury stock method) and the conversion of the Company’s convertible preferred stock (using the “if converted” method).

	The following table presents the calculation of basic and diluted net loss per share:


		Years Ended December 31,
		2014			2013			2012
	Numerator:
	Net loss available to common stockholders	$	(33,171	)	$	(35,852	)	$	(26,482	)

	Denominator:
	Weighted average number of shares, basic and diluted		34,210			26,312			4,417

	Net loss per share available to common stockholders
	Basic and diluted net loss per common share available to common stockholders	$	(0.97	)	$	(1.36	)	$	(6.00	)

	The following table presents the potential common shares outstanding that were excluded from the computation of diluted net loss per share available to common stockholders for the periods presented because including them would have been anti-dilutive:


		Years Ended December 31,
		2014			2013			2012
	Convertible preferred stock		—			—			18,753
	Options to purchase common stock		6,376			4,855			4,314
	Restricted stock units		769			—			—
	Restricted common stock		580			—			—
	Common stock subject to repurchase		85			180			284
	Convertible preferred stock warrants		—			—			51
	Common stock warrants		—			—			63

			7,810			5,035			23,465

Segment_Reporting

Segment Reporting	12 Months Ended
Segment Reporting	Dec. 31, 2014
Segment Reporting [Abstract]
Segment Reporting	14. Segment Reporting
	The Company defines the term “chief operating decision maker” to be the Chief Executive Officer. The Chief Executive Officer reviews the financial information presented on a consolidated basis for purposes of allocating resources and evaluation of financial performance. Accordingly, the Company has determined that it operates as a single reportable and operating segment.
	Revenues by geographic area, based on the billing location of the customer, were as follows:


		Years Ended December 31,
		2014		2013		2012
	United States of America	$	65,745	$	52,725	$	43,429
	International		33,609		24,590		16,129

	Total revenues, net	$	99,354	$	77,315	$	59,558


	Long-lived assets, excluding goodwill and intangible assets, by geographic area were as follows:


		December 31,
		2014		2013
	United States of America	$	15,701	$	14,050
	International		573		367

	Total long-lived assets, net	$	16,274	$	14,417

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
Commitments and Contingencies	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	15. Commitments and Contingencies
	Operating Leases
	Rent expense for 2014, 2013 and 2012 was $7,478, $6,811, and $4,741, respectively.
	The Company has leased office space in San Francisco, London, Austin, Chicago, Dublin, Hamburg, New York, Paris, Portland, Singapore, Sydney, Tokyo and Shanghai under non-cancelable operating leases, which expire between 2015 and 2022. Additionally, the Company leases the space utilized for data center operations.
	Future minimum lease payments for significant operating leases as of December 31, 2014 were as follows:


	Years Ending
	2015	$	6,278
	2016		7,108
	2017		6,817
	2018		3,900
	2019		3,800
	Thereafter		7,893

		$	35,796

	Legal Matters
	From time to time, the Company may be involved in lawsuits, claims, investigations and proceedings, consisting of intellectual property, commercial, employment and other matters, which arise in the ordinary course of business. In accordance with GAAP, the Company records a liability when it is both probable that a liability has been incurred and the amount of the loss can be reasonably estimated. These provisions are reviewed at least quarterly and adjusted to reflect the impact of negotiations, settlements, ruling, advice of legal counsel and other information and events pertaining to a particular case. Litigation is inherently unpredictable. If any unfavorable ruling were to occur in any specific period or if a loss becomes probable and estimable, there exists the possibility of a material adverse impact on the Company’s results of operations, financial position or cash flows.
	Indemnification
	The Company enters into standard indemnification agreements in the ordinary course of business. Pursuant to the agreements, each party may indemnify, defend and hold the other party harmless with respect to such claim, suit or proceeding brought against it by a third party alleging that the indemnifying party’s intellectual property infringes upon the intellectual property of the third party, or results from a breach of the indemnifying party’s representations and warranties or covenants, or that results from any acts of negligence or willful misconduct. The term of these indemnification agreements is generally perpetual any time after execution of the agreement. The maximum potential amount of future payments the Company could be required to make under these indemnification agreements is unlimited. Historically, the Company has not been obligated to make significant payments for these obligations and no liabilities have been recorded for these obligations on the consolidated balance sheets as of December 31, 2014 and 2013.
	The Company also indemnifies its officers and directors for certain events or occurrences, subject to certain limits, while the officer or director is or was serving at the Company’s request in such capacity. The maximum amount of potential future indemnification is unlimited; however, the Company has a Directors and Officers insurance policy that limits its exposure and enables the Company to recover a portion of any future amounts paid. Historically, the Company has not been obligated to make any payments for these obligations and no liabilities have been recorded for these obligations on the consolidated balance sheets as of December 31, 2014 and 2013.
	Other Contingencies
	The Company is subject to claims and assessments from time to time in the ordinary course of business. The Company’s management does not believe that any such matters, individually or in the aggregate, will have a material adverse effect on the Company’s financial position, results of operations or cash flows.

Employee_Benefit_Plans

Employee Benefit Plans	12 Months Ended
Employee Benefit Plans	Dec. 31, 2014
Postemployment Benefits [Abstract]
Employee Benefit Plans	16. Employee Benefit Plans
Employee Benefit Plans	The Company sponsors a 401(k) defined contribution plan covering all employees in the United States. The Board of Directors determines contributions made by the Company annually. The Company made no contributions under this plan for 2014, 2013 and 2012.

Related_Party_Transactions

Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 31, 2014
Related Party Transactions [Abstract]
Related Party Transactions	17. Related Party Transactions
Related Party Transactions	In October 2013, the Company appointed James Barrese to the Board of Directors. Mr. Barrese is the Chief Technology Officer of PayPal, Inc, which is a customer of the Company. During 2014 and 2013, the Company recorded total revenues of $390 and $163, respectively, through its subscription agreements with PayPal, Inc. and their affiliate eBay Inc.

Subsequent_Events

Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2014
Subsequent Events [Abstract]
Subsequent Events	18. Subsequent Events
	Acquisition
	On February 12, 2015, the Company acquired SocialMoov, a Paris-based social advertising platform for Facebook and Twitter advertising. Under the terms of the agreement, total consideration for the acquisition was $18,750, consisting of $8,000 of cash, and $10,750 in common stock. The Company also agreed to grant approximately $2,000 in stock-based awards with time-based vesting to employees of SocialMoov that continued employment with the Company.
	The results of SocialMoov’s operations will be included in the consolidated financial statements following the acquisition date. The Company is currently evaluating the purchase price allocation following the consummation of the transaction. It is not possible to disclose the preliminary purchase price allocation given the short period of time between the acquisition date and the filing of this report.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2014

Accounting Policies [Abstract]

Basis of Presentation

Principles of Consolidation

The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany accounts and transactions have been eliminated upon consolidation.

Accounting Estimates

Certain Significant Risks and Uncertainties

Concentration of Credit Risk

Cash and Cash Equivalents

Fair Value of Financial Instruments

Level 1

Inputs are unadjusted quoted prices in active markets for identical assets or liabilities.

Level 2

Level 3

Inputs are unobservable inputs based on the Company’s assumptions.

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

Allowance for Doubtful Accounts and Revenue Credits

Years Ended December 31,

2014

2013

2012

Balances at beginning of period

417

277

196

Additions

821

359

296

Write-offs

(249

)

(219

)

(215

)

Balances at end of period

989

417

277

Property and Equipment

The useful lives of the property and equipment are as follows:

Computer equipment

3 to 5 years

Office equipment, furniture and fixtures

3 to 5 years

Software

3 years

Leasehold improvements

Shorter of useful life or lease term

Internally Developed Software

Goodwill, Intangible Assets and Impairment Assessments

Impairment of Long-Lived Assets

Operating Leases

Freestanding Preferred Stock Warrants

Revenue Recognition

•

persuasive evidence of an arrangement exists;

•

the Company’s platform is made available to the customer;

•

the fee is fixed or determinable, and;

•

collection is reasonably assured.

Cost of Revenues

Stock-Based Compensation

Stock-based compensation is measured at grant date based on the fair value of the award and is expensed on a straight-line basis over the requisite service period.

See Note 11 for further information.

Research and Development

Advertising and Promotion

Foreign Currency

Income Taxes

Recent Accounting Pronouncements

In August 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-15, Disclosures of Uncertainties About an Entity’s Ability to Continue as a Going Concern . The new standard provides guidance around management’s responsibility to evaluate whether there is substantial doubt about an entity’s ability to continue as a going concern and to provide related footnote disclosures. The new standard is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2016. Early adoption is permitted. The Company does not expect that this guidance will have a material impact on its consolidated results of operations or financial condition.

In June 2014, the FASB issued ASU 2014-12, Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period . The guidance requires that a performance target that affects vesting and could be achieved after the requisite service period be treated as a performance condition. A reporting entity should apply existing guidance as it relates to such awards. This guidance is effective for us in our first quarter of fiscal year ending December 31, 2017. We are currently evaluating the impact of our pending adoption of this ASU on the Company’s consolidated financial statements.

Business Combination

The acquisition was accounted for under the acquisition method of accounting in which the tangible and identifiable intangible assets and liabilities of Perfect Audience were recorded at their respective fair values as of the acquisition date, including an amount for goodwill representing the difference between the respective acquisition consideration and fair values of identifiable net assets. The fair value of assets acquired and liabilities assumed was recorded based on a preliminary valuation and the Company’s estimates and assumptions are subject to change within the measurement period. The primary areas of the purchase price allocation that are not yet finalized are related to the fair values of liabilities assumed and residual goodwill.

Net Loss Per Share Available to Common Stockholders

Basic net loss per share available to common stockholders is calculated by dividing the net loss available to common stockholders by the weighted-average number of shares of common stock outstanding for the period. Net loss available to common stockholders is calculated using the two class method as net loss less the preferred stock dividend for the period less the amount of net loss, if any, allocated to the preferred stock based on weighted preferred stock outstanding during the period relative to total stock outstanding during the period. As the Company’s preferred stockholders did not have the contractual obligations to share in the losses of the Company, no loss was allocated to the convertible preferred stockholders in the determination of net loss available to common stockholders. The weighted-average number of shares of common stock used to calculate the Company’s basic net loss per share available to common stockholders excludes those shares subject to repurchase related to unvested common shares, stock options that were exercised prior to vesting, restricted stock issued and RSUs settled for shares of common stock as these shares are not deemed to be outstanding for accounting purposes until they vest. The diluted net loss per share of common stock is computed by dividing the net loss using the weighted-average number of shares of common stock, excluding common stock subject to repurchase, and, if dilutive, potential shares of common stock outstanding during the period. Potential shares of common stock consist of common stock subject to repurchase, stock options to purchase common stock, restricted common stock issued, RSUs settled for shares of common stock, warrants to purchase convertible preferred stock (using the treasury stock method) and the conversion of the Company’s convertible preferred stock (using the “if converted” method).

Segment Reporting

The Company defines the term “chief operating decision maker” to be the Chief Executive Officer. The Chief Executive Officer reviews the financial information presented on a consolidated basis for purposes of allocating resources and evaluation of financial performance. Accordingly, the Company has determined that it operates as a single reportable and operating segment.

Commitments and Contingencies

From time to time, the Company may be involved in lawsuits, claims, investigations and proceedings, consisting of intellectual property, commercial, employment and other matters, which arise in the ordinary course of business. In accordance with GAAP, the Company records a liability when it is both probable that a liability has been incurred and the amount of the loss can be reasonably estimated. These provisions are reviewed at least quarterly and adjusted to reflect the impact of negotiations, settlements, ruling, advice of legal counsel and other information and events pertaining to a particular case. Litigation is inherently unpredictable. If any unfavorable ruling were to occur in any specific period or if a loss becomes probable and estimable, there exists the possibility of a material adverse impact on the Company’s results of operations, financial position or cash flows.

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Tables)	12 Months Ended
Summary of Significant Accounting Policies (Tables)	Dec. 31, 2014
Accounting Policies [Abstract]
Changes in Allowance for Doubtful Accounts	The following are changes in the allowance for doubtful accounts during 2014, 2013 and 2012, respectively.


		Years Ended December 31,
		2014			2013			2012
	Balances at beginning of period	$	417		$	277		$	196
	Additions		821			359			296
	Write-offs		(249	)		(219	)		(215	)

	Balances at end of period	$	989		$	417		$	277

Schedule of Useful Lives of Property and Equipment	The useful lives of the property and equipment are as follows:


	Computer equipment	3 to 5 years
	Office equipment, furniture and fixtures	3 to 5 years
	Software	3 years
	Leasehold improvements	Shorter of useful life or lease term

Business_Combination_Tables

Business Combination (Tables)	12 Months Ended
Business Combination (Tables)	Dec. 31, 2014
Business Combinations [Abstract]
Summary of Fair Values of Tangible Assets Acquired, Liabilities Assumed, Intangible Assets and Goodwill	The following table summarizes the fair values of tangible assets acquired, liabilities assumed, intangible assets and goodwill:


		Estimated			Estimated
		Fair Value			Useful Life
	Tangible assets acquired	$	1,492		N/A
	Liabilities assumed		(5,079	)	N/A
	Developed technology		6,110		6 years
	Customer relationships		1,290		4 years
	Non-compete agreements and tradename		1,130		2 - 3 years
	Goodwill		11,527		Indefinite

	Total purchase price	$	16,470

Balance_Sheet_Components_Table

Balance Sheet Components (Tables)	12 Months Ended
Balance Sheet Components (Tables)	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Components of Property and Equipment	The following table shows the components of property and equipment as of the dates presented:


		December 31,
		2014			2013

	Computer equipment	$	21,422		$	16,314
	Software		11,022			7,690
	Office equipment		795			571
	Furniture, fixtures and leasehold improvements		2,092			1,861

			35,331			26,436
	Less: Accumulated depreciation and amortization		(19,057	)		(12,019	)

		$	16,274		$	14,417

Components of Accrued Expenses and Other Current Liabilities	The following table shows the components of accrued expenses and other current liabilities as of the dates presented:


		December 31,
		2014			2013
	Accrued salary and payroll related expenses	$	6,017		$	6,675
	Accrued accounts payable		3,709			2,773
	Customer advances		1,366			—
	Income tax payable		377			434
	Sales and use tax payable		263			466
	Other		321			602

		$	12,053		$	10,950

Goodwill_and_Intangible_Assets1

Goodwill and Intangible Assets (Tables)	12 Months Ended
Goodwill and Intangible Assets (Tables)	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Intangible Assets	Intangible assets consisted of the following as of the dates presented:


		December			Estimated
		31, 2014			Useful Life
	Developed technology	$	6,110		6 years
	Customer relationships		1,290		4 years
	Non-compete agreements and tradename		1,130		2-3 years

			8,530
	Less: accumulated amortization		(1,131	)

		$	7,399

Schedule of Future Estimated Amortization Costs of Intangible Assets	Future estimated amortization of intangible assets as of December 31, 2014 is presented below:


	Year ending December 31, 2015	$	1,938
	Year ending December 31, 2016		1,714
	Year ending December 31, 2017		1,483
	Year ending December 31, 2018		1,245
	Year ending December 31, 2019		1,019

		$	7,399

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	12 Months Ended
Fair Value Measurements (Tables)	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Account Balances Measured at Fair Value on Recurring Basis	Account balances measured at fair value on a recurring basis include the following as of December 31, 2014 and 2013:


		December 31,
		2014							2013
		Level 1			Level 2		Level 3		Level 1		Level 2		Level 3
	Cash equivalents
	Money market funds	$	58,027		$	—	$	—	$	98,987	$	—	$	—
Changes in Preferred Stock Warrant Obligation Measured and Recorded at Fair Value on Recurring Basis	The following table presents the changes in the preferred stock warrant obligation measured and recorded at fair value on a recurring basis, using significant unobservable inputs (Level 3) during 2013 and 2012.

		Years Ended December 31,
		2013			2012
	Balances at beginning of year	$	507		$	145
	Change in unrealized loss included in earnings		238			362
	Conversion to common stock warrant		(745	)		—

	Balances at end of year	$	—		$	507

Debt_Tables

Debt (Tables)	12 Months Ended
Debt (Tables)	Dec. 31, 2014
Debt Disclosure [Abstract]
Schedule of Outstanding Debt Balances	The Company’s outstanding balances under the capital lease and Equipment Advance Facilities as of December 31, 2014 and 2013 are as follows:


		December 31,
		2014			2013
	Capital lease	$	1,542		$	2,598
	Equipment Advance Facilities		1,697			3,771

			3,239			6,369
	Discount on long-term debt		(31	)		(154	)

		$	3,208		$	6,215

Maturities of Outstanding Debt	The maturities of debt as of December 31, 2014 are as follows:


	Years Ending
	2015	$	2,587
	2016		652

			3,239
	Less:
	Current portion		(2,587	)
	Discount on long-term debt		(31	)

	Noncurrent portion of debt	$	621

Convertible_Preferred_Stock_Ta

Convertible Preferred Stock (Tables)	12 Months Ended
Convertible Preferred Stock (Tables)	Dec. 31, 2014
Equity [Abstract]
Summary of Information Related to Convertible Preferred Stock Prior to Conversion into Common Stock	The following table summarizes information related to the Company’s convertible preferred stock prior to conversion into common stock:


		Shares		Shares		Liquidation		Proceeds
		Authorized		Outstanding		Amount		Net of
								Issuance
								Cost
	Series A		2,009		2,009	$	2,248	$	2,208
	Series A-1		1,400		1,400		2,329		2,273
	Series B		2,673		2,622		7,227		7,146
	Series C		4,673		4,673		12,999		12,915
	Series D		2,022		2,022		11,192		11,038
	Series E		1,744		1,744		16,036		15,934
	Series F		2,805		2,805		34,488		34,294
	Series F-1		1,478		1,478		20,000		19,902

			18,804		18,753	$	106,519	$	105,710

Common_Stock_Tables

Common Stock (Tables)	12 Months Ended
Common Stock (Tables)	Dec. 31, 2014
Equity [Abstract]
Reserved Shares of Common Stock	As of December 31, 2014 and 2013, reserved shares of common stock are as follows:


		December 31,
		2014		2013
	Options available for future grant under stock option plans		3,154		4,585
	Options outstanding under stock option plans		6,376		4,855
	RSUs outstanding under stock option plans		769		—
	Shares available for future issuance under ESPP		1,005		854

			11,304		10,294

Equity_Award_Plans_Tables

Equity Award Plans (Tables)	12 Months Ended
Equity Award Plans (Tables)	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Activity under the 2006 Plan and 2013 Plan	A summary of activity under the 2006 Plan and the 2013 Plan is as follows:


		Options Outstanding
		Number of			Weighted		Weighted		Aggregate
		Shares			Average		Average		Intrinsic
					Exercise		Remaining		Value
					Price		Contractual
							Term
							(in Years)
	Balances at December 31, 2011		3,000		$	1.71		6.23	$	10,575

	Options granted		2,046			7.48		8.34
	Options exercised		(518	)		3.23		—
	Options forfeited and cancelled		(214	)		3.66		—

	Balances at December 31, 2012		4,314			1.71		7.11	$	34,439

	Options granted		1,594			11.98		9.26
	Options exercised		(618	)		2.42		—
	Options forfeited and cancelled		(435	)		8.6		—

	Balances at December 31, 2013		4,855			6.56		7.85	$	20,593

	Options granted		3,558			9.39		8.35
	Options exercised		(791	)		3.12		—
	Options forfeited and cancelled		(1,246	)		9.51		—

	Balances at December 31, 2014		6,376		$	7.99		7.82	$	9,697

	Options exercisable as of December 31, 2014		2,887		$	6.11		5.91	$	9,501

	Options vested as of December 31, 2014		2,331		$	5.35		5.49	$	8,987

	Options vested and expected to vest as of December 31, 2014		5,985		$	7.89		7.72	$	9,660

Summary of Information about Shares Subject to Stock Options Outstanding	The following table summarizes information about shares subject to stock options outstanding as of December 31, 2014:


		Options Outstanding
	Range of Exercise Prices	Number			Weighted
		Outstanding			Average
					Remaining
					Contractual
					Life (in years)
	$0.14 – $0.82		468			2.74
	$2.39 – $2.70		770			5.47
	$5.20 – $7.76		1,044			7.25
	$8.17 – $9.87		2,858			9.49
	$10.30 – $11.82		448			8.86
	$12.12 – $14.18		788			7.43

			6,376

Summary of RSUs Granted and Unvested under the 2013 Plan	A summary of RSUs granted and unvested under the 2013 Plan as of December 31, 2014 is as follows:


		RSUs Outstanding
		Number of			Weighted Average
		RSUs			Fair Value
					Per Unit
	Granted and unvested at December 31, 2013		—		$	—
	RSUs granted		777			9.37
	RSUs vested		—			—
	RSUs forfeited		(8	)		10.56

	Granted and unvested at December 31, 2014		769		$	9.36

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	12 Months Ended
Stock-Based Compensation (Tables)	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Assumptions Used to Estimate Fair Value of Options	The Company used the following assumptions:


		Years Ended December 31,
		2014			2013			2012
	Dividend yield		—			—			—
	Expected volatility		51.3	%		55	%		57	%
	Risk-free interest rate		1.89	%		1.27	%		0.95	%
	Expected life of options (in years)		6.25			6.25			6.25
	Forfeiture rate		7	%		7	%		3.2% –7.0%
	Weighted-average grant-date fair value	$	4.77		$	6.41		$	4.37
	Weighted-average grant-date exercise price	$	9.39		$	11.98		$	7.48

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
Income Taxes (Tables)	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Schedule of Components of Loss Before (Benefit from) Provision for Income Taxes	The components of the Company’s loss before (benefit from) provision for income taxes were as follows:


		Years Ended December 31,
		2014			2013			2012
	United States of America	$	(26,427	)	$	(24,197	)	$	(27,423	)
	International		(8,200	)		(11,163	)		1,162

		$	(34,627	)	$	(35,360	)	$	(26,261	)

Schedule of Components of (Benefit from) Provision for Income Taxes	The components of the (benefit from) provision for income taxes were as follows:


		Years Ended December 31,
		2014			2013			2012
	Current income tax provision
	Federal	$	—		$	—		$	—
	State		101			26			19
	Foreign		700			557			310

	Total current income tax provision		801			583			329

	Deferred income tax (benefit) provision
	Federal		(2,094	)		—			—
	State		(191	)		—			—
	Foreign		28			(91	)		(108	)

	Total deferred income tax (benefit) provision		(2,257	)		(91	)		(108	)

	(Benefit from) provision for income taxes	$	(1,456	)	$	492		$	221


Differences in Total (Benefit from) Provision for Income Taxes	The differences in the total (benefit from) provision for income taxes that would result from applying the 34% federal statutory rate to loss before provision for income taxes and the reported provision for income taxes were as follows:


		Years Ended December 31,
		2014			2013			2012
	Tax benefit at U.S. statutory rate	$	(11,773	)	$	(12,022	)	$	(8,929	)
	State income taxes, net of federal benefit		(105	)		19			19
	Foreign income and withholding taxes		3,593			4,382			(184	)
	Stock-based compensation		984			863			458
	Change in valuation allowance		5,982			4,437			9,082
	Research and development credits		(807	)		(776	)		(823	)
	Uncertain tax positions		52			1,499			—
	Provision to return adjustments		(53	)		1,894			328
	Other		671			196			270

		$	(1,456	)	$	492		$	221

Schedule of Components of Company's Deferred Tax Assets	Major components of the Company’s deferred tax assets as of December 31, 2014 and 2013 are as follows:


		December 31,
		2014			2013
	Current
	Accruals and reserves	$	1,250		$	1,816
	Stock-based compensation		586			151
	Other		118			(64	)

	Current deferred tax assets		1,954			1,903
	Valuation allowance		(1,822	)		(1,853	)

	Total current deferred tax asset, net of valuation allowance		132			50

	Noncurrent
	Net operating loss		34,586			27,355
	Accruals and reserves		128			149
	Research and development credits		4,791			3,391
	Stock-based compensation		1,757			452
	Property and equipment and intangible assets		543			914
	Other		(235	)		94

	Noncurrent deferred tax assets		41,570			32,355
	Valuation allowance		(41,531	)		(32,205	)

	Total non-current deferred tax asset, net of valuation allowance	$	39		$	150

Change in Unrecognized Tax Benefits	The aggregate changes in the balance of gross unrecognized tax benefits were as follows:


	Beginning balance as of January 1, 2014	$	1,088
	Increase in balances related to tax positions taken during the current period		394
	Increase in balances related to tax positions taken during the prior period		99

	Ending balance as of December 31, 2014	$	1,581

Net_Loss_Per_Share_Available_t1

Net Loss Per Share Available to Common Stockholders (Tables)	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Calculation of Basic and Diluted Net Loss Per Share	The following table presents the calculation of basic and diluted net loss per share:


		Years Ended December 31,
		2014			2013			2012
	Numerator:
	Net loss available to common stockholders	$	(33,171	)	$	(35,852	)	$	(26,482	)

	Denominator:
	Weighted average number of shares, basic and diluted		34,210			26,312			4,417

	Net loss per share available to common stockholders
	Basic and diluted net loss per common share available to common stockholders	$	(0.97	)	$	(1.36	)	$	(6.00	)

Potential Common Shares Outstanding	The following table presents the potential common shares outstanding that were excluded from the computation of diluted net loss per share available to common stockholders for the periods presented because including them would have been anti-dilutive:


		Years Ended December 31,
		2014			2013			2012
	Convertible preferred stock		—			—			18,753
	Options to purchase common stock		6,376			4,855			4,314
	Restricted stock units		769			—			—
	Restricted common stock		580			—			—
	Common stock subject to repurchase		85			180			284
	Convertible preferred stock warrants		—			—			51
	Common stock warrants		—			—			63

			7,810			5,035			23,465

Segment_Reporting_Tables

Segment Reporting (Tables)	12 Months Ended
Segment Reporting (Tables)	Dec. 31, 2014
Segment Reporting [Abstract]
Revenues by Geographic Area, Based on Billing Location of Customer	Revenues by geographic area, based on the billing location of the customer, were as follows:


		Years Ended December 31,
		2014		2013		2012
	United States of America	$	65,745	$	52,725	$	43,429
	International		33,609		24,590		16,129

	Total revenues, net	$	99,354	$	77,315	$	59,558


	Long-lived assets, excluding goodwill and intangible assets, by geographic area were as follows:


		December 31,
		2014		2013
	United States of America	$	15,701	$	14,050
	International		573		367

	Total long-lived assets, net	$	16,274	$	14,417

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
Commitments and Contingencies (Tables)	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Annual Future Minimum Payments under Operating Leases	Future minimum lease payments for significant operating leases as of December 31, 2014 were as follows:


	Years Ending
	2015	$	6,278
	2016		7,108
	2017		6,817
	2018		3,900
	2019		3,800
	Thereafter		7,893

		$	35,796

Background_Additional_Informat

Background - Additional Information (Detail) (USD $)	0 Months Ended		12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Apr. 11, 2013	Mar. 27, 2013	Dec. 31, 2014
Background And Basis Of Presentation [Line Items]
Incorporation date			31-Mar-06
Common stock shares sold	1,125
Gross proceeds from IPO		$105,000
Net proceeds from shares issuance in IPO	14,648
Initial Public Offering [Member]
Background And Basis Of Presentation [Line Items]
Common stock shares sold		7,500
Public offering price per share		$14
Net proceeds from IPO		$94,659

Summary_of_Significant_Account3

Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Summary Of Significant Accounting Policies [Line Items]
Cash equivalents	$58,027	$98,987
Allowance for potential customer credits	508	389
Capitalization of internally developed software costs	3,146	3,216	1,743
Amortization of capitalized costs related to internally developed software	1,905	1,156	525
Unamortized internally developed software costs	5,476	4,236
Impairment losses on long-lived assets	0	0	0
Advertising and promotion expense	1,475	785	632
Gains losses from foreign exchange transactions	-490	-332	-88
Additional tax expense	5,982	4,437	9,082
Expected changes in liability for unrecognized tax benefits for next twelve months	$0
Customer concentration risk [Member] \| Net accounts receivable [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of customers accounted for more than 10%	0	0
Customer concentration risk [Member] \| Consolidated revenues [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of customers accounted for more than 10%	0	0	0
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Intangible assets amortized useful lives	2 years
Minimum [Member] \| Customer concentration risk [Member] \| Net accounts receivable [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage of concentration of credit risk	10.00%	10.00%
Minimum [Member] \| Customer concentration risk [Member] \| Consolidated revenues [Member]
Summary Of Significant Accounting Policies [Line Items]
Percentage of concentration of credit risk	10.00%	10.00%	10.00%
Minimum [Member] \| Subscription arrangement [Member]
Summary Of Significant Accounting Policies [Line Items]
Length of subscription agreements	1 year
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Intangible assets amortized useful lives	6 years
Software [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life of internally developed software	3 years

Summary_of_Significant_Account4

Summary of Significant Accounting Policies - Changes in Allowance for Doubtful Accounts (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounting Policies [Abstract]
Balances at beginning of period	$417	$277	$196
Additions	821	359	296
Write-offs	-249	-219	-215
Balances at end of period	$989	$417	$277

Summary_of_Significant_Account5

Summary of Significant Accounting Policies - Schedule of Useful Lives of Property and Equipment (Detail)	12 Months Ended
	Dec. 31, 2014
Computer Equipment [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful lives of property and equipment	5 years
Computer Equipment [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful lives of property and equipment	3 years
Office equipment, furniture and fixtures [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful lives of property and equipment	5 years
Office equipment, furniture and fixtures [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful lives of property and equipment	3 years
Software [Member]
Property, Plant and Equipment [Line Items]
Useful lives of property and equipment	3 years
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Leasehold improvements	Shorter of useful life or lease term

Business_Combination_Additiona

Business Combination - Additional Information (Detail) (USD $)	12 Months Ended	0 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Jun. 02, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Purchase price attributable to goodwill	$11,527		$0
Vesting period of common stock	24 months
NowSpots, Inc. [Member]
Business Acquisition [Line Items]
Acquisition date	2-Jun-14
Business acquisition, purchase price		16,470
Common stock value at the date of acquisition		5,275
Number of common stock, shares at the date of acquisition		1,119
Consideration in common stock		11,195
Cash acquired from acquisition		1,124
Purchase price attributable to intangible assets		8,530
Purchase price attributable to goodwill	11,527	11,527
Purchase price of net liabilities assumed		4,711
Additional shares of common stock issued in connection with acquisition		630
Common stock issued in connection with acquisition closing date fair value		$6,301
NowSpots, Inc. [Member] \| Minimum [Member]
Business Acquisition [Line Items]
Vesting period of common stock		2 years
NowSpots, Inc. [Member] \| Maximum [Member]
Business Acquisition [Line Items]
Vesting period of common stock		3 years

Business_Combination_Summary_o

Business Combination - Summary of Fair Values of Tangible Assets Acquired, Liabilities Assumed, Intangible Assets and Goodwill (Detail) (USD $)	12 Months Ended	0 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Jun. 02, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Goodwill	11,527		$0
Maximum [Member]
Business Acquisition [Line Items]
Intangible assets, estimated useful life	6 years
Minimum [Member]
Business Acquisition [Line Items]
Intangible assets, estimated useful life	2 years
Developed technology [Member]
Business Acquisition [Line Items]
Intangible assets, estimated useful life	6 years
Customer relationships [Member]
Business Acquisition [Line Items]
Intangible assets, estimated useful life	4 years
Non-compete agreements and tradename [Member] \| Maximum [Member]
Business Acquisition [Line Items]
Intangible assets, estimated useful life	3 years
Non-compete agreements and tradename [Member] \| Minimum [Member]
Business Acquisition [Line Items]
Intangible assets, estimated useful life	2 years
NowSpots, Inc. [Member]
Business Acquisition [Line Items]
Tangible assets acquired		1,492
Liabilities assumed		-4,711
Goodwill	11,527	11,527
Total purchase price		16,470
Goodwill, estimated useful life		Indefinite
NowSpots, Inc. [Member] \| Developed technology [Member]
Business Acquisition [Line Items]
Intangible assets		6,110
Intangible assets, estimated useful life		6 years
NowSpots, Inc. [Member] \| Customer relationships [Member]
Business Acquisition [Line Items]
Intangible assets		1,290
Intangible assets, estimated useful life		4 years
NowSpots, Inc. [Member] \| Non-compete agreements and tradename [Member]
Business Acquisition [Line Items]
Intangible assets		$1,130
NowSpots, Inc. [Member] \| Non-compete agreements and tradename [Member] \| Maximum [Member]
Business Acquisition [Line Items]
Intangible assets, estimated useful life		2 years
NowSpots, Inc. [Member] \| Non-compete agreements and tradename [Member] \| Minimum [Member]
Business Acquisition [Line Items]
Intangible assets, estimated useful life		3 years

Balance_Sheet_Components_Compo

Balance Sheet Components - Components of Property and Equipment (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$35,331	$26,436
Less: Accumulated depreciation and amortization	-19,057	-12,019
Property and equipment, net	16,274	14,417
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	21,422	16,314
Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	11,022	7,690
Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	795	571
Furniture, Fixtures and Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$2,092	$1,861

Balance_Sheet_Components_Addit

Balance Sheet Components - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Depreciation and amortization of internally developed software	$7,574	$5,878	$3,167

Balance_Sheet_Components_Compo1

Balance Sheet Components - Components of Accrued Expenses and Other Current Liabilities (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Accrued salary and payroll related expenses	$6,017	$6,675
Accrued accounts payable	3,709	2,773
Customer advances	1,366	0
Income tax payable	377	434
Sales and use tax payable	263	466
Other	321	602
Accrued expenses and other current liabilities	$12,053	$10,950

Goodwill_and_Intangible_Assets2

Goodwill and Intangible Assets - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 02, 2014
Finite-Lived Intangible Assets [Line Items]
Goodwill in result of business acquisition	$11,527	$0
Amortization expense of intangible assets	1,131	0	0
NowSpots, Inc. [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill in result of business acquisition	$11,527			$11,527

Goodwill_and_Intangible_Assets3

Goodwill and Intangible Assets - Schedule of Intangible Assets (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	8,530
Less: accumulated amortization	-1,131
Intangible assets, net	7,399
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, estimated useful life	6 years
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, estimated useful life	2 years
Developed technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, estimated useful life	6 years
Intangible assets, gross	6,110
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, estimated useful life	4 years
Intangible assets, gross	1,290
Non-compete agreements and tradename [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross	1,130
Non-compete agreements and tradename [Member] \| Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, estimated useful life	3 years
Non-compete agreements and tradename [Member] \| Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, estimated useful life	2 years

Goodwill_and_Intangible_Assets4

Goodwill and Intangible Assets - Schedule of Future Estimated Amortization Costs of Intangible Assets (Detail) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified	Dec. 31, 2014
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Year ending December 31, 2015	$1,938
Year ending December 31, 2016	1,714
Year ending December 31, 2017	1,483
Year ending December 31, 2018	1,245
Year ending December 31, 2019	1,019
Intangible assets, net	$7,399

Fair_Value_Measurements_Accoun

Fair Value Measurements - Account Balances Measured at Fair Value on Recurring Basis (Detail) (Money Market Funds [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Level 1 [Member]
Cash equivalents
Cash equivalents - Money market funds	$58,027	$98,987
Level 2 [Member]
Cash equivalents
Cash equivalents - Money market funds	0	0
Level 3 [Member]
Cash equivalents
Cash equivalents - Money market funds	$0	$0

Fair_Value_Measurements_Change

Fair Value Measurements - Changes in Preferred Stock Warrant Obligation Measured and Recorded at Fair Value on Recurring Basis (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Conversion to common stock warrant	$0	($745)	$0
Level 3 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance		507	145
Change in unrealized loss included in earnings		238	362
Conversion to common stock warrant		-745	0
Ending balance		$0	$507

Fair_Value_Measurements_Additi

Fair Value Measurements - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value Disclosures [Abstract]
Cash equivalent consist of money market with maturity dates	3 months	3 months
Unrealized gains or losses on money market funds	$0	$0
Amount held in bank deposits	$10,226	$5,420

Debt_Additional_Information_De

Debt - Additional Information (Detail) (USD $)	12 Months Ended			1 Months Ended
Share data in Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 31, 2011	Dec. 31, 2011	Sep. 30, 2013	Dec. 31, 2014	Dec. 31, 2012	31-May-13	Feb. 28, 2013
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Installment	Installment	Sep. 30, 2013	Dec. 31, 2014	Installment	31-May-13	Installment
Line of Credit Facility [Line Items]
Interest expense related to preferred stock warrants and common stock warrants issued		$251,000	$159,000
Revolving credit facility, amount outstanding	3,239,000	6,369,000					3,239,000
Letter of credit drawn current	0						0
Change in the valuation of outstanding preferred stock warrants	0	238,000	362,000
Equipment Advance Facilities [Member]
Line of Credit Facility [Line Items]
Increase in the revolving credit facility				2,000,000
Revolving credit facility, amended annual interest rate				5.50%
Frequency of payments, description	Repayable in 36 consecutive monthly installments of principal and interest
Number of monthly installments				36
Revolving credit facility, the expiration date				1-Dec-14
Revolving credit facility, amount outstanding	1,697,000	3,771,000					1,697,000
Additional Equipment Advance Facility [Member]
Line of Credit Facility [Line Items]
Increase in the revolving credit facility					2,000,000
Revolving credit facility, amended annual interest rate					5.50%
Frequency of payments, description	Repayable in 36 consecutive monthly installments of principal and interest.
Number of monthly installments					36
Revolving credit facility, the expiration date					1-Sep-15
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Increase in the revolving credit facility						15,000,000
Revolving credit facility, amended annual interest rate						0.25%
Revolving credit facility, the expiration date						31-Jul-15
Percentage of eligible accounts receivable						80.00%
Unrestricted cash balance exceeds						50,000,000
Revolving credit facility, amount outstanding	0	0					0
Revolving credit facility, Description	In September 2013, the Company entered into an amendment to the Revolving Credit Facility pursuant to which Silicon Valley Bank agreed to increase the Revolving Credit Facility to the lesser of $15,000 or 80% of the Company's eligible accounts receivable.
Letter of credit	1,293,000						1,293,000
Revolving Credit Facility [Member] \| Common Stock [Member]
Line of Credit Facility [Line Items]
Common stock per share	$2.70						$2.70
Fair value of warrant assumptions, expected volatility							57.00%
Fair value of warrant assumptions, risk free interest rate							2.10%
Fair value of warrant assumptions, expected life							10 years
Fair value of warrant assumptions, dividends							$0
Number of shares purchased from issuance of a warrant	37						37
Expiration date							30-Nov-21
Aggregate estimated fair value of warrant							139,000
Supplemental Equipment Advance [Member]
Line of Credit Facility [Line Items]
Increase in the revolving credit facility			3,000,000					3,000,000
Revolving credit facility, amended annual interest rate								3.00%
Frequency of payments, description	Repayable in 33 consecutive monthly installments of principal and interest
Number of monthly installments								33
Revolving credit facility, the expiration date								1-Mar-16
Supplemental Equipment Advance [Member] \| Warrant [Member]
Line of Credit Facility [Line Items]
Common stock per share	$12.15						$12.15
Fair value of warrant assumptions, expected volatility	57.00%
Fair value of warrant assumptions, risk free interest rate	1.65%
Fair value of warrant assumptions, expected life	10 years
Fair value of warrant assumptions, dividends	$0
Number of shares purchased from issuance of a warrant	27						27		68
Expiration date	31-Dec-22
Aggregate estimated fair value of warrant	213,000
Loan and Security Agreement [Member] \| Series B [Member]
Line of Credit Facility [Line Items]
Number of shares called by issuance of warrant	51						51
Common stock per share	$2.76						$2.76
Expiration date of warrant	30-Oct-18
Expiration period of warrant	5 years
Aggregate estimated fair value of warrant	72,000						72,000
Fair value of warrant assumptions, expected volatility	53.00%
Fair value of warrant assumptions, risk free interest rate	4.85%
Fair value of warrant assumptions, expected life	10 years
Fair value of warrant assumptions, dividends	$0
Computer Equipment [Member]
Line of Credit Facility [Line Items]
Effective interest rate										6.00%
Number of monthly installments										36
Net book value of equipment under capital lease	1,439,000						1,439,000
Remaining principal balance payable	$1,542,000						$1,542,000

Debt_Schedule_of_Outstanding_D

Debt - Schedule of Outstanding Debt Balances (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Long-term debt outstanding, gross	$3,239,000	$6,369,000
Discount on long-term debt	-31,000	-154,000
Long term debt outstanding, net	3,208,000	6,215,000
Capital lease [Member]
Debt Instrument [Line Items]
Long-term debt outstanding, gross	1,542,000	2,598,000
Equipment Advance Facilities [Member]
Debt Instrument [Line Items]
Long-term debt outstanding, gross	$1,697,000	$3,771,000

Debt_Maturities_of_Outstanding

Debt - Maturities of Outstanding Debt (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Disclosure [Abstract]
2015	$2,587
2016	652
Total	3,239
Total	3,239
Less:
Current portion	-2,587	-3,253
Discount on long-term debt	-31	-154
Noncurrent portion of debt	$621	$2,962

Convertible_Preferred_Stock_Ad

Convertible Preferred Stock - Additional Information (Detail) (USD $)	12 Months Ended			1 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 31, 2012
Class of Stock [Line Items]
Preferred stock conversion rate	The Companybs outstanding convertible preferred stock (bSeries A Stock,b bSeries A-1 Stock,b bSeries B Stock,b bSeries C Stock,b bSeries D Stock,b bSeries E Stock,b bSeries F Stockb and bSeries F-1 Stockb) automatically converted at a rate of 1:1 into common stock.
Preferred stock conversion ratio	1
Payments for repurchase of preferred stock	$20	$77
Aggregate estimated fair value of repurchased common stock				$1,898
Stock-based compensation expense	0	0	2,590
Sales and Marketing [Member]
Class of Stock [Line Items]
Stock-based compensation expense	1,895	1,304	1,005
Research and Development [Member]
Class of Stock [Line Items]
Stock-based compensation expense	3,785	1,346	831
General and Administrative [Member]
Class of Stock [Line Items]
Stock-based compensation expense	2,797	1,681	2,673
Convertible Preferred Stock [Member]
Class of Stock [Line Items]
Dividends declared	0
Common Stock [Member]
Class of Stock [Line Items]
Number of shares of common stock repurchased				365
Payments for repurchase of preferred stock				$4,488
Series F [Member]
Class of Stock [Line Items]
Issuance price of preferred stock				$12.30

Convertible_Preferred_Stock_Su

Convertible Preferred Stock - Summary of Information Related to Convertible Preferred Stock Prior to Conversion into Common Stock (Detail) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified	Dec. 31, 2014
Class of Stock [Line Items]
Shares Authorized	18,804
Shares Outstanding	18,753
Liquidation Amount	$106,519
Proceeds Net of Issuance Cost	105,710
Series A [Member]
Class of Stock [Line Items]
Shares Authorized	2,009
Shares Outstanding	2,009
Liquidation Amount	2,248
Proceeds Net of Issuance Cost	2,208
Series A-1 [Member]
Class of Stock [Line Items]
Shares Authorized	1,400
Shares Outstanding	1,400
Liquidation Amount	2,329
Proceeds Net of Issuance Cost	2,273
Series B [Member]
Class of Stock [Line Items]
Shares Authorized	2,673
Shares Outstanding	2,622
Liquidation Amount	7,227
Proceeds Net of Issuance Cost	7,146
Series C [Member]
Class of Stock [Line Items]
Shares Authorized	4,673
Shares Outstanding	4,673
Liquidation Amount	12,999
Proceeds Net of Issuance Cost	12,915
Series D [Member]
Class of Stock [Line Items]
Shares Authorized	2,022
Shares Outstanding	2,022
Liquidation Amount	11,192
Proceeds Net of Issuance Cost	11,038
Series E [Member]
Class of Stock [Line Items]
Shares Authorized	1,744
Shares Outstanding	1,744
Liquidation Amount	16,036
Proceeds Net of Issuance Cost	15,934
Series F [Member]
Class of Stock [Line Items]
Shares Authorized	2,805
Shares Outstanding	2,805
Liquidation Amount	34,488
Proceeds Net of Issuance Cost	34,294
Series F-1 [Member]
Class of Stock [Line Items]
Shares Authorized	1,478
Shares Outstanding	1,478
Liquidation Amount	20,000
Proceeds Net of Issuance Cost	$19,902

Common_Stock_Additional_Inform

Common Stock - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Feb. 12, 2013	Dec. 31, 2012
Class of Stock [Line Items]
Common stock, shares authorized	500,000	36,000	500,000
Common stock, par value	$0.00	$0.00	$0.00
Convertible preferred stock, shares authorized			10,000
Convertible preferred stock, par value			$0.00
Common stock, shares issued	35,846	33,133
Proceeds from issuance of common stock	$35	$33
Common stock, shares unvested	769	0
Stock options, vest period	24 months
CSPAs [Member]
Class of Stock [Line Items]
Common stock, shares issued				84
Proceeds from issuance of common stock				$500
Common stock, shares unvested	0

Common_Stock_Reserved_Shares_o

Common Stock - Reserved Shares of Common Stock (Detail)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Class of Stock [Line Items]
Reserved shares of Common Stock	11,304	10,294
Shares Available for Future Issuance under ESPP [Member]
Class of Stock [Line Items]
Reserved shares of Common Stock	1,005	854
RSUs [Member]
Class of Stock [Line Items]
Reserved shares of Common Stock	769	0
Options Outstanding [Member]
Class of Stock [Line Items]
Reserved shares of Common Stock	6,376	4,855
Options Available for Future Grant [Member]
Class of Stock [Line Items]
Reserved shares of Common Stock	3,154	4,585

Equity_Award_Plans_Additional_

Equity Award Plans - Additional Information (Detail) (USD $)	12 Months Ended			0 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 01, 2014	Feb. 28, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, vest period	24 months
Common stock reserved for issuance	11,304	10,294
Intrinsic value of options exercised	$5,615	$5,693	$2,266
Estimated fair value of share options vested	5,447	3,110	1,572
2013 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance					4,500
Percentage of shares outstanding under Equity Award Plan	5.00%
Increase in common stock available for issuance				1,648
2013 Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance					1,000
Percentage of shares outstanding under Equity Award Plan	1.00%
Increase in common stock available for issuance				329
Percentage of fair market value of common stock of lesser	85.00%
Number of shares reserved under Employee Stock Purchase Plan	700
Shares issued under 2013 ESPP	178	146
Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, vest period	10 years
Reason Other Than Disability or Death [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise period of options	3 months
Due to Disability or Death [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise period of options	12 months
Employee Stock Plan 2006 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, vest period	10 years
Repurchase of common stock	85	180
Long-term liability	$826	$1,215

Equity_Award_Plans_Summary_of_

Equity Award Plans - Summary of Activity under the 2006 Plan and 2013 Plan (Detail) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Equity [Abstract]
Number of Shares, Options Outstanding, Balance	4,855	4,314	3,000
Weighted Average Remaining Contractual Term, Options granted (in Years)	8 years 4 months 6 days	9 years 3 months 4 days	8 years 4 months 2 days
Number of Shares, Options granted	3,558	1,594	2,046
Weighted Average Remaining Contractual Term, Options exercised (in Years)	0 years	0 years	0 years
Number of Shares, Options exercised	-791	-618	-518
Weighted Average Remaining Contractual Term, Options forfeited and cancelled (in Years)	0 years	0 years	0 years
Number of Shares, Options forfeited and cancelled	-1,246	-435	-214
Weighted Average Remaining Contractual Term, Options Outstanding (in Years)	7 years 9 months 26 days	7 years 10 months 6 days	7 years 1 month 10 days	6 years 2 months 23 days
Number of Shares, Options Outstanding, Balance	6,376	4,855	4,314	3,000
Weighted Average Remaining Contractual Term, Options exercisable (in Years)	5 years 10 months 28 days
Weighted Average Exercise Price, Options Outstanding, Balance	$6.56	$1.71	$1.71
Number of Shares, Options exercisable, Balance	2,887
Weighted Average Remaining Contractual Term, Options vested (in Years)	5 years 5 months 27 days
Weighted Average Exercise Price, Options granted	$9.39	$11.98	$7.48
Number of Shares, Options vested, Balance	2,331
Weighted Average Remaining Contractual Term, Options vested and expected to vest (in Years)	7 years 8 months 19 days
Weighted Average Exercise Price, Options exercised	$3.12	$2.42	$3.23
Number of Shares, Options vested and expected to vest, Balance	5,985
Weighted Average Exercise Price, Options forfeited and cancelled	$9.51	$8.60	$3.66
Weighted Average Exercise Price, Options Outstanding, Balance	$7.99	$6.56	$1.71	$1.71
Aggregate Intrinsic Value, Options Outstanding, Balance	$20,593	$34,439	$10,575
Weighted Average Exercise Price, Options exercisable, Balance	$6.11
Weighted Average Exercise Price, Options vested, Balance	$5.35
Weighted Average Exercise Price, Options vested and expected to vest, Balance	$7.89
Aggregate Intrinsic Value, Options Outstanding, Balance	9,697	20,593	34,439	10,575
Aggregate Intrinsic Value, Options exercisable, Balance	9,501
Aggregate Intrinsic Value, Outstanding, Options vested, Balance	8,987
Aggregate Intrinsic Value, Outstanding, Options vested and expected to vest, Balance	$9,660

Equity_Award_Plans_Summary_of_1

Equity Award Plans - Summary of Information about Shares Subject to Stock Options Outstanding (Detail) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options Outstanding	6,376	4,855	4,314	3,000
Weighted Average Remaining Contractual Life in years, Options outstanding	7 years 9 months 26 days	7 years 10 months 6 days	7 years 1 month 10 days	6 years 2 months 23 days
Range of Exercise Prices, $0.14 - $0.83 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower limit	0.14
Exercise Price Range, Upper limit	0.82
Number of Options Outstanding	468
Weighted Average Remaining Contractual Life in years, Options outstanding	2 years 8 months 27 days
Range of Exercise Prices, $2.39 - $2.70 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower limit	2.39
Exercise Price Range, Upper limit	2.7
Number of Options Outstanding	770
Weighted Average Remaining Contractual Life in years, Options outstanding	5 years 5 months 19 days
Range of Exercise Prices, $5.20 - $7.76 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower limit	5.2
Exercise Price Range, Upper limit	7.76
Number of Options Outstanding	1,044
Weighted Average Remaining Contractual Life in years, Options outstanding	7 years 3 months
Range of Exercise Prices, $8.17 - $9.87 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower limit	8.17
Exercise Price Range, Upper limit	9.87
Number of Options Outstanding	2,858
Weighted Average Remaining Contractual Life in years, Options outstanding	9 years 5 months 27 days
Range of Exercise Prices, $10.3 - $11.82 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower limit	10.3
Exercise Price Range, Upper limit	11.82
Number of Options Outstanding	448
Weighted Average Remaining Contractual Life in years, Options outstanding	8 years 10 months 10 days
Range of Exercise Prices, $12.1 - $14.18 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower limit	12.12
Exercise Price Range, Upper limit	14.18
Number of Options Outstanding	788
Weighted Average Remaining Contractual Life in years, Options outstanding	7 years 5 months 5 days

Equity_Award_Plans_Summary_of_2

Equity Award Plans - Summary of RSUs Granted and Unvested under the 2013 Plan (Detail) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014
Equity [Abstract]
Number of RSUs, Granted and unvested, Beginning balance	0
Number of RSUs, granted	777
Number of RSUs, vested	0
Number of RSUs, forfeited	-8
Number of RSUs, Granted and unvested, Ending balance	769
Weighted Average Fair Value Per Unit, Granted and unvested, Beginning balance	$0
Weighted Average Fair Value Per Unit, RSUs granted	$9.37
Weighted Average Fair Value Per Unit, RSUs vested	$0
Weighted Average Fair Value Per Unit, RSUs forfeited	$10.56
Weighted Average Fair Value Per Unit, Granted and unvested, Ending balance	$9.36

StockBased_Compensation_Additi

Stock-Based Compensation - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$9,242	$5,218	$2,358
Cash proceeds from the exercise of stock options	2,472	1,541	1,624
Unrecognized compensation cost related to options	16,112	11,597
Recognized weighted-average period	3 years	2 years 8 months 12 days
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	9,242	5,218	4,948
Restricted Stock and RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to restricted stock and RSUs	$9,459
Weighted-average period over which unrecognized compensation cost expected to be recognized	2 years 2 months 12 days

StockBased_Compensation_Assump

Stock-Based Compensation - Assumptions Used to Estimate Fair Value of Options (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	0.00%	0.00%	0.00%
Expected volatility	51.30%	55.00%	57.00%
Risk-free interest rate	1.89%	1.27%	0.95%
Expected life of options (in years)	6 years 3 months	6 years 3 months	6 years 3 months
Forfeiture rate	7.00%	7.00%
Weighted-average grant-date fair value	$4.77	$6.41	$4.37
Weighted-average grant-date exercise price	$9.39	$11.98	$7.48
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Forfeiture rate			3.20%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Forfeiture rate			7.00%

Income_Taxes_Schedule_of_Compo

Income Taxes - Schedule of Components of Loss Before (Benefit from) Provision for Income Taxes (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
United States of America	($26,427)	($24,197)	($27,423)
International	-8,200	-11,163	1,162
Loss before benefit from (provision for) income taxes	($34,627)	($35,360)	($26,261)

Income_Taxes_Schedule_of_Compo1

Income Taxes - Schedule of Components of (Benefit from) Provision of Income Taxes (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current income tax provision
Federal	$0	$0	$0
State	101	26	19
Foreign	700	557	310
Total current income tax provision	801	583	329
Deferred income tax (benefit) provision
Federal	-2,094	0	0
State	-191	0	0
Foreign	28	-91	-108
Total deferred income tax (benefit) provision	-2,257	-91	-108
(Benefit from) provision for income taxes	($1,456)	$492	$221

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
Income Taxes - Additional Information (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule Of Income Taxes [Line Items]
Federal statutory rate on loss before provision for income taxes	34.00%
Additional paid-in capital increase	$126,000	$119,000	$192,000
Cumulative ownership percentage	50.00%
Cumulative ownership period	3 years
Net operating losses	-33,984,000	-34,336,000	-25,285,000
Valuation allowance against our current deferred tax assets as of December 31	1,822,000	1,853,000	10,951,000
Interest or penalties related to unrecognized tax benefits	0	0	0
Untaxed undistributed earnings of foreign subsidiaries	1,292,000
Federal [Member]
Schedule Of Income Taxes [Line Items]
Net operating losses	184,000
Net operating loss carryforwards	99,779,000
Net operating loss carryforwards expiration date	2026
State [Member]
Schedule Of Income Taxes [Line Items]
Net operating losses	214,000
Net operating loss carryforwards	85,288,000
Net operating loss carryforwards expiration date	2016
Federal Research and Development [Member]
Schedule Of Income Taxes [Line Items]
Research and development credits	3,938,000		3,497,000
State Research and Development [Member]
Schedule Of Income Taxes [Line Items]
Research and development credits	$0

Income_Taxes_Differences_in_To

Income Taxes - Differences in Total (Benefit from) Provision for Income Taxes (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Tax benefit at U.S. statutory rate	($11,773)	($12,022)	($8,929)
State income taxes, net of federal benefit	-105	19	19
Foreign income and withholding taxes	3,593	4,382	-184
Stock-based compensation	984	863	458
Change in valuation allowance	5,982	4,437	9,082
Research and development credits	-807	-776	-823
Uncertain tax positions	52	1,499	0
Provision to return adjustments	-53	1,894	328
Other	671	196	270
(Benefit from) provision for income taxes	($1,456)	$492	$221

Income_Taxes_Schedule_of_Compo2

Income Taxes - Schedule of Components of Company's Deferred Tax Assets (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current
Accruals and reserves	$1,250	$1,816
Stock-based compensation	586	151
Other	118	-64
Current deferred tax assets	1,954	1,903
Valuation allowance	-1,822	-1,853	-10,951
Total current deferred tax asset, net of valuation allowance	132	50
Noncurrent
Net operating loss	34,586	27,355
Accruals and reserves	128	149
Research and development credits	4,791	3,391
Stock-based compensation	1,757	452
Property and equipment and intangible assets	543	914
Other	-235	94
Noncurrent deferred tax assets	41,570	32,355
Valuation allowance	-41,531	-32,205
Total non-current deferred tax asset, net of valuation allowance	$39	$150

Income_Taxes_Changes_in_Unreco

Income Taxes - Changes in Unrecognized Tax Benefits (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Beginning balance	$1,088
Increase in balances related to tax positions taken during the current period	394
Increase in balances related to tax positions taken during the prior period	99
Ending balance	$1,581

Net_Loss_Per_Share_Available_t2

Net Loss Per Share Available to Common Stockholders - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Loss allocated to convertible preferred stockholders	$0

Net_Loss_Per_Share_Available_t3

Net Loss Per Share Available to Common Stockholders - Calculation of Basic and Diluted Net Loss Per Share (Detail) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Numerator:
Net loss available to common stockholders	($33,171)	($35,852)	($26,482)
Denominator:
Weighted average number of shares, basic and diluted	34,210	26,312	4,417
Net loss per share available to common stockholders
Basic and diluted net loss per common share available to common stockholders	($0.97)	($1.36)	($6)

Net_Loss_Per_Share_Available_t4

Net Loss Per Share Available to Common Stockholders - Potential Common Shares Outstanding (Detail)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential common shares outstanding	7,810	5,035	23,465
Convertible Preferred Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential common shares outstanding	0	0	18,753
Options to Purchase Common Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential common shares outstanding	6,376	4,855	4,314
RSUs [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential common shares outstanding	769	0	0
Restricted Common Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential common shares outstanding	580	0	0
Common Stock Subject to Repurchase [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential common shares outstanding	85	180	284
Convertible Preferred Stock Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential common shares outstanding	0	0	51
Common Stock Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential common shares outstanding	0	0	63

Segment_Reporting_Additional_I

Segment Reporting - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014
	Segment
Segment Reporting [Abstract]
Number of operating segments	1

Segment_Reporting_Revenues_by_

Segment Reporting - Revenues by Geographic Area, Based on Billing Location of Customer (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues, net	$99,354	$77,315	$59,558
Total long-lived assets, net	16,274	14,417
United States of America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues, net	65,745	52,725	43,429
Total long-lived assets, net	15,701	14,050
International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues, net	33,609	24,590	16,129
Total long-lived assets, net	$573	$367

Commitments_and_Contingencies_1

Commitments and Contingencies - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]
Rent expense	$7,478	$6,811	$4,741
Non-cancelable operating leases, minimum year	2015
Non-cancelable operating leases, maximum year	2022
Liabilities obligations	$0	$0

Commitments_and_Contingencies_2

Commitments and Contingencies - Annual Future Minimum Payments under Operating Leases (Detail) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
2015	$6,278
2016	7,108
2017	6,817
2018	3,900
2019	3,800
Thereafter	7,893
Future minimum lease payments for significant operating leases	$35,796

Employee_Benefit_Plans_Additio

Employee Benefit Plans - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule Of Sale Of Subsidiary [Abstract]
Employer contributions to employee benefit plans	$0	$0	$0

Related_Party_Transactions_Add

Related Party Transactions - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Related Party Transactions [Abstract]
Total revenues through subscription agreements	$390	$163

Subsequent_Events_Additional_I

Subsequent Events - Additional Information (Detail) (Subsequent Events [Member], SocialMoov [Member], USD $)	0 Months Ended
In Thousands, unless otherwise specified	Feb. 12, 2015	Feb. 12, 2015
Subsequent Events [Member] \| SocialMoov [Member]
Subsequent Event [Line Items]
Total consideration	$18,750
Cash consideration	8,000
Consideration in common stock	10,750
Stock options agreed to grant	$2,000	$2,000