Zendesk (ZEN) 10-K 17 Feb 15 2014 FY Annual report Financial data

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	ZEN
Entity Registrant Name	Zendesk, Inc.
Entity Central Index Key	1463172
Current Fiscal Year End Date	-19
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		75,791,926
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Public Float			$561.80

CONSOLIDATED_BALANCE_SHEETS

CONSOLIDATED BALANCE SHEETS (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current Assets:
Cash and cash equivalents	$80,265	$53,725
Marketable securities	42,204	9,889
Accounts receivable, net of allowance for doubtful accounts of $264 and $282	11,523	7,237
Prepaid expenses and other current assets	5,013	3,008
Total current assets	139,005	73,859
Marketable securities, noncurrent	9,205	2,225
Property and equipment, net	41,895	15,431
Goodwill and intangible assets, net	14,152
Other assets	1,531	1,221
Total assets	205,788	92,736
Current liabilities:
Accounts payable	4,763	3,685
Accrued liabilities	7,689	4,648
Accrued compensation and related benefits	11,738	4,618
Deferred revenue	50,908	28,473
Current portion of credit facility	3,041	365
Current portion of capital leases	10	364
Total current liabilities	78,149	42,153
Deferred revenue, noncurrent	823	575
Credit facility, noncurrent	3,911	23,395
Other liabilities	9,199	1,520
Total liabilities	92,082	67,643
Commitments and contingencies (Note 8)
Redeemable convertible preferred stock, par value $0.01, issuable in series: no shares and 24.0 million shares authorized; no shares and 23.6 million shares issued and outstanding as of December 31, 2014 and 2013, respectively		71,369
Stockholders’ equity (deficit):
Preferred stock, par value $0.01 per share: 10.0 million and no shares authorized as of December 31, 2014 and 2013, respectively; no shares issued and outstanding as of December 31, 2014 and 2013
Common stock, par value $0.01 per share: 400.0 million and 125.0 million shares authorized; 76.1 million and 23.7 million shares issued; 75.5 million and 23.2 million shares outstanding as of December 31, 2014 and 2013, respectively (including 0.6 million and 0.8 million shares subject to repurchase, legally issued and outstanding as of December 31, 2014 and 2013, respectively)	755	229
Additional paid-in capital	246,000	18,591
Accumulated other comprehensive income (loss)	-528	10
Accumulated deficit	-131,869	-64,454
Treasury stock at cost; 0.5 million shares as of December 31, 2014 and 2013	-652	-652
Total stockholders’ equity (deficit)	113,706	-46,276
Total liabilities, redeemable convertible preferred stock, and stockholders’ equity (deficit)	$205,788	$92,736

CONSOLIDATED_BALANCE_SHEETS_Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts	$264	$282
Redeemable convertible preferred stock, par value	$0.01	$0.01
Redeemable convertible preferred stock, shares authorized	0	24,000,000
Redeemable convertible preferred stock, shares issued	0	23,600,000
Redeemable convertible preferred stock, shares outstanding	0	23,600,000
Preferred stock, par value	$0.01	$0.01
Preferred stock, shares authorized	10,000,000	0
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	400,000,000	125,000,000
Common stock, shares issued	76,100,000	23,700,000
Common stock, shares outstanding	75,500,000	23,200,000
Common stock shares outstanding, subject to repurchase	600,000	800,000
Treasury stock, shares	500,000	500,000

CONSOLIDATED_STATEMENTS_OF_OPE

CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Income Statement [Abstract]
Revenue	$127,049		$72,045		$38,228
Cost of revenue	46,047	[1]	24,531	[1]	13,253	[1]
Gross profit	81,002		47,514		24,975
Operating expenses:
Research and development	36,403	[1]	15,288	[1]	14,816	[1]
Sales and marketing	77,875	[1]	37,622	[1]	22,749	[1]
General and administrative	32,869	[1]	16,437	[1]	11,558	[1]
Total operating expenses	147,147	[1]	69,347	[1]	49,123	[1]
Operating loss	-66,145		-21,833		-24,148
Other expense, net	-1,533		-517		-96
Loss before provision for (benefit from) income taxes	-67,678		-22,350		-24,244
Provision for (benefit from) income taxes	-263		221		121
Net loss	-67,415		-22,571		-24,365
Accretion of redeemable convertible preferred stock	-18		-49		-50
Deemed dividend to investors in relation to the tender offer					-8,326
Net loss attributable to common stockholders	($67,433)		($22,620)		($32,741)
Net loss per share attributable to common stockholders, basic and diluted	($1.26)		($1.04)		($1.67)
Weighted-average shares used to compute net loss per share attributable to common stockholders, basic and diluted	53,571		21,674		19,629
[1]	Includes share-based compensation expense as follows:

CONSOLIDATED_STATEMENTS_OF_OPE1

CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cost of Revenue
Share-based compensation expense	$2,464,000	$254,000	$129,000
Research and Development
Share-based compensation expense	10,918,000	635,000	4,117,000
Sales and Marketing
Share-based compensation expense	10,680,000	1,210,000	1,313,000
General and Administrative
Share-based compensation expense	$8,077,000	$2,755,000	$4,081,000

CONSOLIDATED_STATEMENTS_OF_COM

CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement Of Income And Comprehensive Income [Abstract]
Net loss	($67,415)	($22,571)	($24,365)
Other comprehensive income (loss), net of tax:
Net change in unrealized gain (loss) on available-for-sale investments	-71	10
Changes in foreign currency translation adjustment	-467		-40
Comprehensive loss	($67,953)	($22,561)	($24,405)

CONSOLIDATED_STATEMENTS_OF_RED

CONSOLIDATED STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) (USD $)	Total	Redeemable Convertible Preferred Stock	Common Stock	Additional Paid-in Capital	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
In Thousands
Balances at Dec. 31, 2011	($16,594)	$26,385	$187	$1,349	($652)	$40	($17,518)
Balances, shares at Dec. 31, 2011		15,016	21,996		-535
Issuance of Series D redeemable convertible preferred stock, value		44,885
Issuance of Series D redeemable convertible preferred stock, shares		8,582
Accretion of redeemable convertible preferred stock	-50	50		-50
Issuance of common stock upon exercise of stock options, value	214		7	207
Issuance of common stock upon exercise of stock options, shares			718
Issuance of common stock upon early exercise of stock options			529
Vesting of early exercised stock options	723		18	705
Issuance of common stock upon exercise of warrants	182			182
Repurchase of common stock, shares			-5
Share-based compensation	9,725			9,725
Foreign currency translation adjustment	-40					-40
Net loss	-24,365						-24,365
Balances at Dec. 31, 2012	-30,205	71,320	212	12,118	-652		-41,883
Balances, shares at Dec. 31, 2012		23,598	23,238		-535
Accretion of redeemable convertible preferred stock	-49	49		-49
Issuance of common stock upon exercise of stock options, value	681		8	673
Issuance of common stock upon exercise of stock options, shares			765
Issuance of common stock upon early exercise of stock options			164
Vesting of early exercised stock options	861		9	852
Repurchase of common stock, shares			-457
Share-based compensation	4,997			4,997
Unrealized gain on investment	10					10
Net loss	-22,571						-22,571
Balances at Dec. 31, 2013	-46,276	71,369	229	18,591	-652	10	-64,454
Balances, shares at Dec. 31, 2013		23,598	23,710		-535
Issuance of common stock upon initial public offering, net of offering costs	103,090		128	102,962
Issuance of common stock upon initial public offering, net of offering costs, shares			12,778
Accretion of redeemable convertible preferred stock	-18	18		-18
Conversion of preferred stock to common stock upon initial public offering, value	71,387	-71,387	343	71,044
Conversion of preferred stock to common stock upon initial public offering, shares	34,300	-23,598	34,323
Issuance of common stock for acquisition of Zopim Technologies Ptd Ltd.	10,892		9	10,883
Issuance of common stock for acquisition of Zopim Technologies Ptd Ltd., shares			902
Issuance of common stock upon exercise of stock options, value	4,970		32	4,938
Issuance of common stock upon exercise of stock options, shares	3,516		3,207
Issuance of common stock for settlement of restricted stock units (RSUs)			5	-5
Issuance of common stock for settlement of restricted stock units (RSUs), shares			517
Shares withheld related to net share settlement of RSUs, value	-2,118		-1	-2,117
Shares withheld related to net share settlement of RSUs			-147
Issuance of common stock upon early exercise of stock options			309
Vesting of early exercised stock options	1,512		5	1,507
Issuance of common stock in connection with employee stock purchase plans	3,271		4	3,267
Issuance of common stock in connection with employee stock purchase plans, shares			428
Issuance of common stock upon exercise of warrants			1	-1
Issuance of common stock upon exercise of warrants, shares			111
Repurchase of common stock, shares	-4		-4
Share-based compensation	34,615			34,615
Tax benefit from share-based award activity	334			334
Other comprehensive loss, net of income taxes	-538					-538
Foreign currency translation adjustment	-467
Unrealized gain on investment	-71
Net loss	-67,415						-67,415
Balances at Dec. 31, 2014	$113,706		$755	$246,000	($652)	($528)	($131,869)
Balances, shares at Dec. 31, 2014			76,134		-535

CONSOLIDATED_STATEMENTS_OF_RED1

CONSOLIDATED STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) (Parenthetical) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2012
Statement Of Stockholders Equity [Abstract]
Net of issuance costs of Series D redeemable convertible preferred stock	$115

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
Cash flows from operating activities
Net loss	($67,415)	($22,571)	($24,365)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	11,456	5,222	2,506
Share-based compensation	32,139	4,854	9,640
Excess tax benefit from share-based award activity	-334
Other	337	179	123
Changes in operating assets and liabilities:
Accounts receivable	-3,846	-3,594	-1,404
Prepaid expenses and other current assets	-1,444	-482	-1,571
Other assets and liabilities	1,742	303	-383
Accounts payable	947	2,409	704
Accrued liabilities	351	1,724	401
Accrued compensation and related benefits	5,767	2,043	1,583
Deferred revenue	22,390	13,918	7,670
Net cash provided by (used in) operating activities	2,090	4,005	-5,096
Cash flows from investing activities
Purchases of property and equipment	-21,665	-7,116	-3,582
Internal-use software costs	-8,013	-4,661	-3,505
Purchases of marketable securities	-54,330	-12,409
Proceeds from maturities of marketable securities	10,450
Proceeds from sale of marketable securities	4,004
Decrease (increase) to restricted cash	153		-32
Cash paid for the acquisition of Zopim, net of cash acquired	-1,896
Net cash used in investing activities	-71,297	-24,186	-7,119
Cash flows from financing activities
Proceeds from initial public offering, net of issuance costs	103,090
Proceeds from issuance of Series D redeemable convertible preferred stock, net of issuance costs			44,885
Proceeds from exercise of employee stock options	7,229	1,793	2,125
Taxes paid related to net share settlement of equity awards	-2,117
Proceeds from issuance of common stock from employee equity plans	4,404
Excess tax benefit from share-based award activity	334
Proceeds from issuance of debt	3,940	23,760
Principal payments on debt	-20,748
Principal payments on capital lease obligations	-364	-337	-305
Net cash provided by financing activities	95,768	25,216	46,705
Effect of exchange rate changes on cash and cash equivalents	-21	2	-40
Net increase in cash and cash equivalents	26,540	5,037	34,450
Cash and cash equivalents at the beginning of period	53,725	48,688	14,238
Cash and cash equivalents at the end of period	80,265	53,725	48,688
Supplemental cash flow data:
Cash paid for interest and income taxes	1,056	171	71
Non-cash investing and financing activities:
Deemed dividends on common stock			8,326
Issuance of common stock for the acquisition of Zopim	10,892
Vesting of early exercised stock options	1,512	860	62
Purchases of property and equipment in accrued expenses	374	251
Property and equipment acquired through tenant improvement allowances	3,932
Issuance of warrant in connection with credit facility			182
Property and equipment acquired under capital leases			123
Share-based compensation capitalized in internal-use software costs	$2,476	$143	$85

Organization

Organization	12 Months Ended
	Dec. 31, 2014
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Organization	Note 1. Organization
	Zendesk was founded in Denmark in 2007 and reincorporated in Delaware in April 2009.
	Our mission is to help organizations and their customers build better relationships. We are a software development company that provides a software-as-a-service, or SaaS, customer service platform. Our platform helps organizations engage with people in new ways that foster long-term customer loyalty and satisfaction. We empower organizations to better answer customers’ questions, and to solve their problems through the channels that people use every day when seeking help, such as email, chat, voice, social media and websites. Our customer service platform also helps people find answers on their own through knowledge bases and communities, capitalizing on the increasing customer preference for self-service. Our customer engagement capabilities allow organizations to proactively serve their customers, reaching out to those who may need help and soliciting feedback about their experience. The openness of our customer service platform makes it easy for organizations to integrate with their other applications. Our customer service platform consolidates the data from customer interactions and provides organizations with powerful analytics and performance benchmarking.
	References to Zendesk or “we” in these notes refer to Zendesk, Inc. and its subsidiaries on a consolidated basis.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Note 2. Summary of Significant Accounting Policies
	Basis of Presentation
	The consolidated financial statements have been prepared in accordance with United States generally accepted accounting principles, or GAAP. The consolidated financial statements include the accounts of Zendesk, Inc. and its subsidiaries. All intercompany balances and transactions have been eliminated upon consolidation.
	Initial Public Offering
	In May 2014, we completed our initial public offering, or IPO, in which we issued and sold 12.8 million shares of common stock at a public offering price of $9.00 per share. We received net proceeds of $103.1 million after deducting underwriting discounts and commissions of $8.1 million and other offering expenses of $3.8 million. Upon the closing of the IPO, all shares of our then-outstanding redeemable convertible preferred stock automatically converted into an aggregate of 34.3 million shares of common stock.
	Reclassification
	Certain prior year amounts have been reclassified for consistency with the current year presentation.  These reclassifications had no effect on the reported results of operations.
	Use of Estimates
	The preparation of consolidated financial statements in conformity with GAAP requires management to make certain estimates, judgments and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, as well as the reported amounts of revenue and expenses during the reported periods.
	Significant items subject to such estimates and assumptions include the fair value of our common stock and share-based awards, fair value of purchased intangible assets, goodwill, unrecognized tax benefits, useful lives of purchased intangible assets and property and equipment, and the capitalization and estimated useful life of our capitalized internal-use software.
	These estimates are based on information available as of the date of the financial statements; therefore, actual results could differ from those estimates.
	Segment Information
	Our chief operating decision maker reviews the financial information presented on a consolidated basis for purposes of allocating resources and evaluating our financial performance. Accordingly, we have determined that we operate in a single operating segment.
	Revenue Recognition
	We generate substantially all of our revenue from subscription services, which are comprised of subscription fees from customer accounts on our customer service platform and, to a lesser extent, live chat software. Arrangements with customers do not provide the customer with the right to take possession of the software supporting our customer service platform or live chat software at any time, and are therefore accounted for as service contracts. Subscription service arrangements are generally non-cancelable and do not provide for refunds to customers in the event of cancellations or any other right of return. We record revenue net of sales or excise taxes.
	We commence revenue recognition when all of the following conditions are met:
	·	There is persuasive evidence of an arrangement;
	·	The service has been or is being provided to the customer;
	·	The collection of the fees is reasonably assured; and
	·	The amount of fees to be paid by the customer is fixed or determinable.
	Subscription revenue is recognized on a straight-line basis over the contractual term of the arrangement beginning on the date that our service is made available to the customer. Payments received in advance of services being rendered are recorded as deferred revenue and recognized on a straight-line basis over the requisite service period.
	Certain customers have arrangements that provide for a maximum number of users over the contract term, with usage measured monthly.  Revenue for these arrangements is recognized ratably over the contract terms. Incremental fees are incurred when the maximum number of users is exceeded, and any incremental fees are recognized as revenue ratably over the remaining contractual term.
	We derive an immaterial amount of revenue from implementation, voice, and training services, for which we recognize revenue upon completion.
	Deferred Revenue
	Deferred revenue consists primarily of customer billings in advance of revenue being recognized. We invoice customers for subscriptions to our customer service platform or live chat software in monthly, quarterly, or annual installments. Deferred revenue that is anticipated to be recognized during the succeeding 12-month period is recorded as current deferred revenue and the remaining portion is recorded as noncurrent deferred revenue. Deferred revenue associated with implementation, voice, and training services was immaterial as of December 31, 2014 and 2013.
	Cost of Revenue
	Cost of revenue consists primarily of personnel costs (including salaries, benefits, and share-based compensation) for employees associated with our platform infrastructure and our product support organizations, data center costs related to hosting our platform, depreciation and other expenses associated with our self-managed colocation data centers, amortization expense associated with capitalized internal-use software, payment processing fees, amortization expense associated with purchased intangible assets, and allocated shared costs.
	Cash, Cash Equivalents, and Restricted Cash
	We consider all highly liquid investments purchased with a remaining maturity of three months or less to be cash equivalents. Cash and cash equivalents are recorded at fair value and consist primarily of bank deposits and money market funds.
	There was no restricted cash as of December 31, 2014 as compared to $0.2 million as of December 31, 2013.  As of December 31, 2014, the certificate of deposit pledged as collateral on credit cards had been refunded.
	Marketable Securities
	Marketable securities consist of corporate bonds and auto and credit card asset backed securities. We classify marketable securities as available-for-sale at the time of purchase and reevaluate such classification as of each balance sheet date. All marketable securities are recorded at their estimated fair value. Unrealized gains and losses for available-for-sale securities are recorded in other comprehensive loss. We evaluate our investments to assess whether those with unrealized loss positions are other than temporarily impaired. Impairments are considered other than temporary if they are related to deterioration in credit risk or if it is likely we will sell the securities before the recovery of their cost basis. Realized gains and losses and declines in value determined to be other than temporary are determined based on the specific identification method and are reported in other expense, net in the consolidated statements of operations.
	Accounts Receivable and Allowance for Doubtful Accounts
	Accounts receivable are recorded at the invoiced amount, net of allowance for doubtful accounts. The allowance is based upon historical loss patterns, the age of each past due invoice, and an evaluation of the potential risk of loss associated with delinquent accounts. Accounts receivable deemed uncollectable are charged against the allowance for doubtful accounts when identified.
	The allowance for doubtful accounts consists of the following activity (in thousands):
			Year Ended December 31,
			2014			2013
	Allowance for doubtful accounts, beginning balance		$	282		$	173
	Additions			843			301
	Write-offs			(861	)		(192	)
	Allowance for doubtful accounts, ending balance		$	264		$	282
	Property and Equipment
	Property and equipment are stated at cost less accumulated depreciation. Depreciation is calculated using the straight-line method over the estimated useful lives of assets. Maintenance and repair costs are charged to expense as incurred. The estimated useful lives of our property and equipment are as follows:
	Furniture and fixtures			5 years
	Hosting equipment			3 years
	Computer equipment and software			3 years
	Leasehold improvements			Shorter of the lease term or estimated useful life
	Depreciation expense of assets acquired through capital leases is included in depreciation and amortization expense in the accompanying consolidated statements of operations.
	Fair Value Measurements
	We measure certain financial assets at fair value using a fair value hierarchy. A financial instrument’s classification within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. Three levels of inputs may be used to measure fair value:
	Level 1—Observable inputs that reflect quoted prices (unadjusted) for identical assets or liabilities in active markets.
	Level 2—Other inputs that are directly or indirectly observable in the marketplace.
	Level 3—Unobservable inputs that are supported by little or no market activity.
	Our marketable securities are classified in either Level 1 or Level 2 and we have no financial assets or liabilities measured using Level 3 inputs. The fair value of our Level 1 financial assets is based on quoted market prices of the identical underlying security. The fair value of our Level 2 financial assets is based on inputs that are directly or indirectly observable in the market, including readily available pricing sources for identical underlying securities that may not be actively traded.
	For certain other financial instruments, including accounts receivable, accounts payable and other current liabilities, the carrying amounts approximate their fair value due to the relatively short maturity of these balances. Based on borrowing rates available to us for loans with similar terms and maturities, the carrying value of borrowings approximates fair value or Level 2 within the fair value hierarchy.
	Capitalized Internal-Use Software Costs
	We capitalize certain development costs incurred in connection with software development for our platform and software used in operations. Costs incurred in the preliminary stages of development are expensed as incurred. Once software has reached the development stage, internal and external costs, if direct and incremental, are capitalized until the software is substantially complete and ready for its intended use. Capitalization ceases upon completion of all substantial testing. We also capitalize costs related to specific upgrades and enhancements when it is probable the expenditures will result in additional functionality. Capitalized costs are recorded as part of property and equipment. Maintenance and training costs are expensed as incurred.
	Capitalized internal-use software is amortized on a straight-line basis over its estimated useful life and recorded in cost of revenue within the accompanying consolidated statements of operations. The weighted-average useful life of our capitalized internal-use software was 3.2 years as of December 31, 2014.
	Business Combination
	When we acquire businesses, we allocate the purchase price to the net tangible and identifiable intangible assets. Any residual purchase price is recorded as goodwill. The allocation of the purchase price requires management to make significant estimates in determining the fair values of assets acquired and liabilities assumed, especially with respect to intangible assets. These estimates can include, but are not limited to, the cash flows that an asset is expected to generate in the future, the appropriate weighted-average cost of capital, and the cost savings expected to be derived from acquiring an asset. These estimates are inherently uncertain and unpredictable.
	Goodwill, Purchased Intangible Assets, and Impairment Assessment of Long-Lived Assets
	Goodwill. Goodwill represents the excess purchase consideration of an acquired business over the fair value of the net tangible and identifiable intangible assets. Goodwill is evaluated for impairment annually in the third quarter, and whenever events or changes in circumstances indicate the carrying value of goodwill may not be recoverable. Triggering events that may indicate impairment include, but are not limited to, a significant adverse change in customer demand or business climate or a significant decrease in expected cash flows. No impairment charges were recorded during the year ended December 31, 2014. No goodwill was recorded prior to December 31, 2013.
	Purchased Intangible Assets. Purchased intangible assets consist of identifiable intangible assets, primarily developed technology and customer relationships, resulting from our acquisition. Intangible assets are recorded at fair value on the date of acquisition and amortized over their estimated economic lives following the pattern in which the economic benefits of the assets will be consumed, generally straight-line.
	Impairment of Long-Lived Assets. The carrying amounts of our long-lived assets, including property and equipment, capitalized internal-use software, and purchased intangible assets, are reviewed periodically for impairment whenever events or changes in circumstances indicate that the carrying value of these assets may not be recoverable or that the useful life is shorter than originally estimated. Recoverability of assets to be held and used is measured by comparing the carrying amount of an asset to future undiscounted net cash flows the asset is expected to generate over its remaining life. If the asset is considered to be impaired, the amount of any impairment is measured as the difference between the carrying value and the fair value of the impaired asset. If the useful life is shorter than originally estimated, we amortize the remaining carrying value over the new shorter useful life. No impairment of any long-lived assets was identified for the years ended December 31, 2014 and 2013.
Share Based Compensation
Share-based compensation expense to employees is measured based on the fair value of the awards on the grant date and recognized in our consolidated statements of operations over the period during which the employee is required to perform services in exchange for the award (generally the vesting period of the award). We estimate the fair value of stock options granted using the Black-Scholes option valuation model. We measure the fair value of restricted stock units, or RSUs, based on the fair value of the underlying shares on the date of grant. Compensation expense for awards with only service conditions is recognized over the vesting period of the applicable award using the straight-line method.
All RSUs and certain options granted to employees prior to the IPO vest upon the satisfaction of both a service condition and a performance condition. These RSUs and stock options with both a service condition and performance condition are collectively referred to as “Performance Awards” in the following discussion. The service condition for substantially all of these awards is satisfied over four years. The performance condition was satisfied upon the occurrence of a qualifying liquidity event which occurred upon the effectiveness of the registration statement related to our IPO. No share-based compensation expense was recognized for the Performance Awards prior to the IPO as the performance condition had not been deemed probable to have been met. Upon the satisfaction of the performance condition, we recognized a cumulative share-based compensation expense for the portion of the Performance Awards that had met the service condition. For the year ended December 31, 2014, share-based compensation expense related to the Performance Awards recognized was $12.7 million, using the accelerated attribution method. The remaining unrecognized share-based compensation expense related to the Performance Awards will be recorded over the remaining requisite service period using the accelerated attribution method, net of estimated forfeitures.
As of December 31 2014, we had a total of $74.5 million in future period share-based compensation expense related to all equity awards, net of estimated forfeitures, to be recognized over a weighted average period of 3.5 years.
Advertising Expense
Advertising is expensed as incurred. For the years ended December 31, 2014, 2013, and 2012, advertising expense was $12.7 million, $6.5 million, and $3.5 million, respectively.
Income Taxes
We record income taxes using the asset and liability method, which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been recognized in our consolidated financial statements or tax returns. Deferred tax assets and liabilities are measured using the tax rates that are expected to apply to taxable income for the years in which those tax assets and liabilities are expected to be realized or settled. Valuation allowances are provided when necessary to reduce deferred tax assets to the amount expected to be realized.
We recognize tax benefits from uncertain tax positions if it is more likely than not that the tax position will be sustained on examination by the taxing authorities based on the technical merits of the position. Although we believe that we have adequately reserved for our uncertain tax positions, we can provide no assurance that the final tax outcome of these matters will not be materially different. We make adjustments to these reserves when facts and circumstances change, such as the closing of a tax audit or the refinement of an estimate. To the extent that the final tax outcome of these matters is different than the amounts recorded, such differences will affect the provision for income taxes in the period in which such determination is made and could have a material impact on our financial condition and results of operations.
We have elected to record interest accrued and penalties related to unrecognized tax benefits in the financial statements as a component of provision for income taxes.
Foreign Currency
The functional currency of our foreign subsidiaries, with the exception of our Singapore subsidiary, is the U.S. dollar. Accordingly, monetary balance sheet accounts are remeasured using exchange rates in effect at the balance sheet dates and non-monetary items are remeasured at historical exchange rates. Expenses are generally remeasured at the average exchange rates for the period. Foreign currency remeasurement and transaction gains and losses are included in other expense, net on the statements of operations and were not material for the periods presented. The functional currency of our Singapore subsidiary is the Singapore dollar. Assets and liabilities are translated into U.S. dollars at exchange rates in effect at the balance sheet dates. Revenue and expenses are translated at the average exchange rates for the period. Amounts classified in stockholders’ equity (deficit) are translated at historical exchange rates.
Concentrations of Risk
Financial instruments potentially exposing us to concentrations of credit risk consist primarily of cash and cash equivalents, restricted cash, marketable securities and accounts receivable. We place our cash and cash equivalents with high-credit-quality financial institutions.  However, we maintain balances in excess of the FDIC insurance limits. We do not require our customers to provide collateral to support accounts receivable and maintain an allowance for doubtful accounts receivable balances.
At December 31, 2014 and 2013, there were no customers that represented more than 10% of the accounts receivable balance. There were no customers that individually exceeded 10% of our revenue in any of the periods presented.
Recently Issued Accounting Standards
In February 2013, the Financial Accounting Statements Board, or FASB, issued Accounting Standards Update No. 2013-02 “Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income,” which requires an entity to disaggregate the total change of each component of other comprehensive income either on the face of the statement of operations or as a separate disclosure in the notes. The guidance became effective for reporting periods beginning after December 15, 2012 and is applied prospectively. We adopted this standard for the year ended December 31, 2013, and the adoption did not have any impact on our financial position, results of operations, or cash flows, as the amounts reclassified out of accumulated other comprehensive loss are not significant.
In July 2013, the FASB issued Accounting Standards Update No. 2013-11 “Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists,” or ASU 2013-11, which provides guidance on the financial statement presentation of an unrecognized tax benefit when a net operating loss, or NOL, carryforward, a similar tax loss, or a tax credit carryforward exists. ASU 2013-11 supports the approach for companies to present an unrecognized tax benefit as a reduction of a deferred tax asset for a NOL or tax credit carryforward whenever the NOL or tax credit carryforward would be available to reduce the additional taxable income or tax due if the tax position is disallowed. This approach requires companies to assess whether to net the unrecognized tax benefit with a deferred tax asset as of the reporting date. We adopted this standard for the year ended December 31, 2014, and the adoption did not have a material effect on our financial position, results of operations, or cash flows.
On May 28, 2014, the Financial Accounting Statements Board, or FASB, issued ASU 2014-09 regarding ASC Topic 606 “Revenue from Contracts with Customers.” This ASU provides principles for recognizing revenue for the transfer of promised goods or services to customers with the consideration to which the entity expects to be entitled in exchange for those goods or services. This ASU will be effective for our fiscal year beginning January 1, 2017. Early adoption is not permitted. We are currently evaluating the accounting, transition, and disclosure requirements of the standard and cannot currently estimate the financial statement impact of adoption.

Acquisition_of_Zopim_Technolog

Acquisition of Zopim Technologies	12 Months Ended
	Dec. 31, 2014
Business Combinations [Abstract]
Acquisition of Zopim Technologies	Note 3. Acquisition of Zopim Technologies
	On March 21, 2014, we completed the acquisition of Zopim Technologies Pte Ltd., or Zopim, a software development company that provides a SaaS live chat service.  During the three months ended December 31, 2014, we finalized our purchase accounting after adjustments were made to the preliminary purchase price allocation. The total adjusted acquisition date fair value of consideration transferred was $15.8 million ($4.9 million of cash and $10.9 million of our common stock), which included $1.1 million of cash and $2.4 million of common stock consideration held back between 12 and 18 months as partial security for standard indemnification obligations. The total adjusted purchase price was allocated to assets acquired and liabilities assumed as set forth below (in thousands).  The excess of the purchase price over the net assets acquired was recorded as goodwill.  Goodwill generated from the acquisition is attributable to expected synergies from future growth and potential future monetization opportunities, and is not deductible for tax purpose.
	Net tangible liabilities assumed	$	(385	)
	Intangible assets		6,560
	Goodwill		9,594
	Total purchase price	$	15,769
	In connection with the acquisition, we also established a retention plan pursuant to which we issued RSUs for 0.9 million shares of our common stock, which vest in three annual installments from the date of acquisition. In addition, we agreed to pay cash in an aggregate amount of $3.0 million in two annual installments from the date of acquisition to Zopim employees in connection with their continued employment, which is recorded as compensation expense over the associated service periods of such employees.
	Pro forma revenue and results of operations have not been presented because the historical results of Zopim were not material to our consolidated financial statements in any period presented.

Fair_Value_Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Fair Value Measurements	Note 4. Fair Value Measurements
	The following tables present information about our financial assets measured at fair value on a recurring basis as of December 31, 2014 and 2013 based on the three-tier fair value hierarchy (in thousands):
		Fair Value Measurement at
		31-Dec-14
		Level 1		Level 2		Total
	Description
	Corporate bonds	$	—		40,345	$	40,345
	Money market funds		21,382		—		21,382
	Asset-backed securities		—		5,080		5,080
	Commercial paper		—		3,993		3,993
	U.S. treasury securities		—		1,991		1,991
	Total	$	21,382	$	51,409	$	72,791
	Included in cash and cash equivalents					$	21,382
	Included in marketable securities					$	51,409
		Fair Value Measurement at
		31-Dec-13
		Level 1		Level 2		Total
	Description
	Corporate bonds	$	—	$	12,114	$	12,114
	Money market funds		10,836		—		10,836
	Total	$	10,836	$	12,114	$	22,950
	Included in cash and cash equivalents					$	10,836
	Included in marketable securities					$	12,114
	There were no transfers between fair value measurement levels during the years ended December 31, 2014 or 2013.
	Gross unrealized gains or losses for cash equivalent and marketable securities as of December 31, 2014 and 2013 were not material. As of December 31, 2014 and 2013, there were no securities that were in an unrealized loss position for more than twelve months.
	The following table classifies our marketable securities by contractual maturities as of December 31, 2014 and 2013 (in thousands):
		31-Dec-14		31-Dec-13
	Due in one year	$	42,204	$	9,889
	Due in one to five years		9,205		2,225
	Total	$	51,409	$	12,114

Property_and_Equipment

Property and Equipment	12 Months Ended
	Dec. 31, 2014
Property Plant And Equipment [Abstract]
Property and Equipment	Note 5. Property and Equipment
	Property and equipment consists of the following (in thousands):
		31-Dec-14			31-Dec-13
	Capitalized internal-use software	$	18,541		$	11,104
	Furniture and fixtures		4,524			1,383
	Hosting equipment		14,085			7,931
	Computer equipment and software		4,310			1,680
	Leasehold improvements		15,144			1,717
	Construction in progress		3,546			341
	Total		60,150			24,156
	Less accumulated depreciation and amortization		(18,255	)		(8,725	)
	Property and equipment, net	$	41,895		$	15,431
	Depreciation expense was $6.1 million, $2.9 million, and $1.1 million for the years ended December 31, 2014, 2013, and 2012, respectively. We capitalized $10.5 million, $4.8 million, and $3.6 million in costs associated with internal-use software during the years ended December 31, 2014, 2013, and 2012, respectively. Included in the capitalized internal-use software costs are $2.5 million, $0.1 million, and $0.1 million in share-based compensation costs for the years ended December 31, 2014, 2013, and 2012, respectively. Amortization expense of capitalized internal-use software totaled $3.8 million, $2.3 million, and $1.4 million during the years ended December 31, 2014, 2013, and 2012, respectively. The carrying value of capitalized internal-use software at December 31, 2014 and 2013 was $13.6 million and $6.8 million, respectively, including $3.5 million and $0.3 million in construction in progress, respectively.

Goodwill_and_Purchased_Intangi

Goodwill and Purchased Intangibles Assets	12 Months Ended
	Dec. 31, 2014
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Purchased Intangibles Assets	Note 6. Goodwill and Purchased Intangibles Assets
	The changes in the carrying amount of goodwill for the year ended December 31, 2014 are as follows (in thousands):
	Balance as of December 31, 2013	$	—
	Goodwill acquired		9,373
	Goodwill adjustments		221
	Foreign currency translation adjustments		(354	)
	Balance as of December 31, 2014	$	9,240
	Purchased intangible assets related to the Zopim acquisition subject to amortization as of December 31, 2014 consist of the following (in thousands). No purchased intangible assets were recorded as of December 31, 2013.
		Cost			Accumulated			Foreign			Net		Remaining
					Amortization			Currency					Useful Life
								Translation
								Adjustments
													(In years)
	Developed technology	$	5,200		$	(1,118	)	$	(191	)	$	3,891		2.7
	Customer relationships		1,300			(244	)		(48	)		1,008		3.2
	Trade name		60			(45	)		(2	)		13		0.2
		$	6,560		$	(1,407	)	$	(241	)	$	4,912
	Amortization expense of purchased intangible assets related to the Zopim acquisition for the year ended December 31, 2014 was $1.4 million. No amortization expense was recorded for the year ended December 31, 2013.
	Estimated future amortization expense as of December 31, 2014 is as follows (in thousands):
	2015	$	1,757
	2016		1,744
	2017		1,342
	2018		69
		$	4,912

Credit_Facility

Credit Facility	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Credit Facility	Note 7. Credit Facility
	We have a credit facility with Silicon Valley Bank consisting of a $20.0 million revolving line of credit and a $10.0 million equipment line of credit. As of December 31, 2013, outstanding balance under the revolving line of credit was $20.0 million.  In June 2014 we repaid all outstanding principal and accrued interest under the revolving line of credit and as of December 31, 2014 there was no balance outstanding. As of December 31, 2014 and 2013, outstanding balance under the equipment line of credit was $7.0 million and $3.8 million, respectively.
	Prior to our IPO, borrowings on the revolving line of credit bore interest at the Prime Rate plus 2.0% per annum. Upon the consummation of the IPO, the interest rate was reduced to the Prime Rate. Borrowings on the revolving line of credit are subject to a borrowing base limit determined monthly based on our recurring revenue metrics from previous months and the ratio of certain current assets to current liabilities as of the previous month end. To the extent we borrow funds on the revolving line of credit, we are entitled to make interest-only payments until January 1, 2016, when the outstanding balance is due in full.
	Borrowings on the equipment line of credit bear interest of 2.5% per annum. For each equipment advance, we were entitled to make interest-only payments until September 14, 2014, when the last draw against the equipment line of credit could be made. The outstanding balance as of September 14, 2014 is payable in 30 equal monthly installments, with the last payment due on March 14, 2017. We are also required to make a final payment fee of $0.3 million on March 14, 2017.
	The credit facility is collateralized by substantially all of our assets, excluding our intellectual property. Our domestic subsidiary is a guarantor of the credit facility and we have pledged up to 65% of the equity in our international subsidiaries as collateral. The credit facility also imposes various covenants on us, including the delivery of financial and other information, the maintenance of our primary operating and securities accounts with the lender, the maintenance of minimum revenue targets and an agreed ratio of certain current assets to current liabilities, as well as limitations on dispositions, changes in business or management, certain mergers or consolidations, dividends and other corporate activities. As of December 31, 2014 and 2013, we were in compliance with all of the covenants contained in the credit facility.
	Contractual future principal repayments in relation to the credit facility are as follows for the year ending December 31 (in thousands):
	2015	$	3,041
	2016		3,118
	2017		793
		$	6,952
	In June 2012, in connection with the credit facility, we issued a non-refundable, fully earned warrant to Silicon Valley Bank to purchase 125,000 shares of common stock at $1.92 per share with an expiration date of June 2019. The fair value of the warrant on issuance is being accreted to interest expense using the effective interest rate method over the life of the credit facility. This warrant was exercised in the three months ended June 30, 2014.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2014
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 8. Commitments and Contingencies
	Leases
	We lease office space under noncancelable operating leases with various expiration dates. Certain of the office space lease agreements contain rent holidays or rent escalation provisions. Rent holiday and rent escalation provisions are considered in determining the straight-line expense to be recorded over the lease term. The lease term begins on the date of initial possession of the leased property for purposes of recognizing lease expense on a straight-line basis over the term of the lease. In 2013, we renewed the lease of our office in San Francisco through October 2019, with an option to renew for an additional 7 years and 8 months. We also entered into a lease for additional office space in San Francisco with an 8-year term, renewable for an additional period of 5 years. For the years ended December 31, 2014, 2013, and 2012, rent expense was $6.8 million, $2.3 million, and $1.6 million, respectively.
	We lease computer equipment from various parties under capital lease agreements that expire through March 2015. The total outstanding balance financed under capital leases was immaterial at December 31, 2014 and $0.4 million at December 31, 2013. Accumulated depreciation on the leased assets was $1.0 million and $0.7 million at December 31, 2014 and 2013, respectively. Depreciation of assets recorded under capital leases is included in depreciation expense.
	As of December 31, 2014, the future minimum lease payments by year under noncancelable leases are as follows for the year ending December 31 (in thousands):
	2015	$	7,025
	2016		7,067
	2017		6,935
	2018		6,936
	2019		6,672
	Thereafter		12,707
	Total minimum lease payments	$	47,342
	Letters of Credit
	As of December 31, 2014 and 2013, we had a total of $3.7 million and $3.8 million, respectively, in letters of credit outstanding primarily related to our leased office space in San Francisco. The letters of credit are collateralized by substantially all of our assets, excluding our intellectual property. These letters of credit renew annually and mature at various dates through October 31, 2022.
	Litigation and Loss Contingencies
	We accrue estimates for resolution of legal and other contingencies when losses are probable and estimable. From time to time, we may become a party to litigation and subject to claims incident to the ordinary course of business, including intellectual property claims, labor and employment claims, and threatened claims, breach of contract claims, tax, and other matters. We currently have no material pending litigation.
	We are not currently aware of any litigation matters or loss contingencies that would be expected to have a material adverse effect on our business, consolidated financial position, results of operations, comprehensive loss, or cash flows.
	Indemnifications
	In the ordinary course of business, we enter into contractual arrangements under which we agree to provide indemnification of varying scope and terms to business partners and other parties with respect to certain matters, including, but not limited to, losses arising out of the breach of such agreements, intellectual property infringement claims made by third parties, and other liabilities relating to or arising from our customer service platform, live chat software, or our acts or omissions. In these circumstances, payment may be conditional on the other party making a claim pursuant to the procedures specified in the particular contract. Further, our obligations under these agreements may be limited in terms of time and/or amount, and in some instances, we may have recourse against third parties for certain payments. In addition, we have indemnification agreements with our directors and executive officers that require us, among other things, to indemnify them against certain liabilities that may arise by reason of their status or service as directors or officers. The terms of such obligations may vary. To date, we have not incurred any material costs, and we have not accrued any liabilities in the accompanying consolidated financial statements, as a result of these obligations.
	We have entered into service-level agreements with certain customers warranting defined levels of uptime reliability and performance and permitting those customers to receive credits for future services in the event that we fail to meet those levels. To date, we have not experienced any significant failures to meet the defined levels of reliability and performance warranted by those agreements and, as a result, we have not accrued any liabilities related to these agreements in the accompanying consolidated financial statements.

Common_Stock_and_Stockholders_

Common Stock and Stockholders’ Equity (Deficit)	12 Months Ended
	Dec. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Common Stock and Stockholders’ Equity (Deficit)	Note 9. Common Stock and Stockholders’ Equity (Deficit)
	Convertible Preferred Stock
	Upon the completion of the IPO, all outstanding convertible preferred stock was converted into 34.3 million shares of common stock.
	Reverse Stock Split
	In April 2014, our board of directors and stockholders approved a one-for-two reverse stock split of our common stock. All share and per share information throughout the consolidated financial statements and notes to the consolidated financial statements have been retroactively adjusted to reflect this reverse stock split.
	Common Stock Authorized
	At December 31, 2013, there were 80.0 million and 30.0 million shares authorized for Series A and Series B common stock, respectively, and there were 9.9 million and 13.3 million shares outstanding of Series A and Series B common stock, respectively, of which 0.8 million shares of Series B common stock were unvested resulting from employees exercising stock options prior to vesting. Upon the completion of our IPO, each share of Series B common stock was converted into Series A common stock on a one-for-one basis, and the Series A common stock was redesignated as common stock. In addition, we increased the amount of common stock authorized for issuance to 400.0 million common shares with a par value of $0.01 per share.
	Employee Equity Plans
	Employee Stock Purchase Plan
	Our board of directors adopted the Employee Stock Purchase Plan, or ESPP, in February 2014, which became effective in May 2014 upon the effectiveness of the registration statement related to our IPO. The ESPP initially reserved and authorized the issuance of up to 3.6 million shares of common stock. The ESPP provides that the number of shares reserved and available for issuance under the plan automatically increases each January, beginning on January 1, 2015, by the lesser of 1.5 million shares, 1% of the number of shares issued and outstanding on the immediately preceding December 31, or such lesser number of shares as determined by our compensation committee.
	Under the ESPP, eligible employees are granted options to purchase shares of our common stock through payroll deductions. The ESPP provides for eighteen-month offering periods, which include three six-month purchase periods. At the end of each purchase period, employees are able to purchase shares at 85% of the lower of the fair market value of our common stock at the beginning of an offering period or the fair market value of our common stock at the end of the purchase period. We commenced our first purchase period under the ESPP on May 15, 2014. For the year ended December 31, 2014, 0.4 million shares of common stock were purchased under the ESPP at $7.65 per share, resulting in cash proceeds of $3.3 million.  As of December 31, 2014, 3.2 million shares of common stock were available for issuance under the ESPP.
	Stock Option and Grant Plan
	Our board of directors adopted the 2009 Stock Option and Grant Plan, or the 2009 Plan, in July 2009. The 2009 Plan was terminated in connection with our IPO, and accordingly, no shares are available for issuance under this plan. The 2009 Plan continues to govern outstanding awards granted thereunder.
	Our board of directors adopted the 2014 Stock Option and Incentive Plan, or the 2014 Plan, in February 2014, which became effective in May 2014 upon the effectiveness of the registration statement related to our IPO. The 2014 Plan serves as the successor to our 2009 Plan. The 2014 Plan initially reserved and authorized the issuance of 7.5 million shares of our common stock. Additionally, shares not issued or subject to outstanding grants under the 2009 Plan rolled into the 2014 Plan, resulting in a total of 8.3 million available shares under the 2014 Plan as of the effective date. The 2014 Plan provides that the number of shares reserved and available for issuance under the plan automatically increases each January 1, beginning on January 1, 2015, by 5% of the outstanding number of shares of our common stock on the immediately preceding December 31, or such lesser number of shares as determined by our compensation committee.
	A summary of our stock option and RSU activity for the year ended December 31, 2014 is as follows (in thousands, except per share information):
						Options Outstanding									RSUs Outstanding
											Weighted
											Average							Weighted
			Shares						Weighted		Remaining		Aggregate					Average
			Available			Number of			Average		Contractual		Intrinsic		Outstanding			Grant Date
			for Grant			Shares			Exercise Price		Term		Value		RSUs			Fair Value
											(In years)
	Outstanding — January 1, 2014			1,854			10,134		$	2.82		8.15	$	50,185		811		$	6.76
	Increase in authorized shares			13,750
	Stock options granted			(6,308	)		6,308			11.4
	RSUs granted			(3,030	)											3,030			14.44
	Stock options exercised						(3,516	)		2.03
	RSUs vested															(370	)		9.56
	Unvested shares repurchased			4
	Stock options forfeited or canceled			883			(883	)		4.96
	RSUs forfeited or cancelled			407												(407	)		9.31
	Outstanding — December 31, 2014			7,560			12,043		$	7.39		8.29	$	204,467		3,064		$	13.69
	Options vested and expected to vest as of						10,742		$	7.07		8.21	$	185,866
	December 31, 2014
	Options vested and exercisable as of						4,293		$	3.87		7.34	$	88,025
	December 31, 2014
	The total intrinsic value of stock options exercised during the year ended December 31, 2014, 2013, 2012 was $66.2 million, $4.6 million, and $1.8 million, respectively.  Aggregate intrinsic value for options exercised represents the difference between the exercise price and the market value on the date of exercise.  The weighted-average grant date fair value of stock options granted during the years ended December 31, 2014, 2013, and 2012 was $7.22, $1.62, and $0.56, respectively.
	Aggregate intrinsic value for options outstanding represents the difference between the closing stock price of our common stock and the exercise price of outstanding, in-the-money options. Zendesk’s closing stock price as reported on the New York Stock Exchange as of December 31, 2014 was $24.37.
	Share-Based Compensation Expense
	All share-based awards to employees and members of our board of directors are measured based on the grant date fair value of the awards and recognized in the consolidated statements of operations over the period during which the employee is required to perform services in exchange for the award (generally the vesting period of the award). We record share-based compensation expense for service-based equity awards using the straight-line attribution method. We record share-based compensation expense for performance-based equity awards using the accelerated attribution method.
	We estimate the fair value of stock options granted using the Black-Scholes option valuation model, which requires assumptions, including the fair value of our underlying common stock, expected term, expected volatility, risk-free interest rate and dividend yield of our common stock. These estimates involve inherent uncertainties and the application of management’s judgment. If factors change and different assumptions are used, our share-based compensation expense could be materially different in the future.
	These assumptions are estimated as follows:
	·	Fair Value of Common Stock. Prior to our IPO in May 2014, our board of directors, with input from management, exercised significant judgment and considered numerous objective and subjective factors to determine the fair value of our common stock as of the date of each option grant. These factors included, but were not limited to: (i) contemporaneous valuations performed by unrelated third-party specialists, (ii) rights, preferences, and privileges of our redeemable convertible preferred stock relative to those of our common stock, (iii) actual operating and financial performance, (iv) relevant precedent transactions involving our capital stock, (v) likelihood of achieving a liquidity event, such as an initial public offering or a sale of our company given prevailing market conditions and the nature and history of our business, (vi) market multiples of comparable companies in our industry, (vii) stage of development, (viii) industry information such as market size and growth, (ix) illiquidity of share-based awards involving securities in a private company, and (x) macroeconomic conditions.
	Since our IPO, we have used the market closing price for our common stock as reported on the New York Stock Exchange.
	·	Expected Term. We determine the expected term based on the average period the stock options are expected to remain outstanding generally calculated as the midpoint of the stock options vesting term and contractual expiration period, as we do not have sufficient historical information to develop reasonable expectations about future exercise patterns and post-vesting employment termination behavior.
	·	Expected Volatility. We determine the price volatility factor based on the historical volatility of publicly traded industry peers. To determine our peer group of companies, we consider public companies in the technology industry and select those that are similar to us in size, stage of life cycle, and financial leverage. We do not rely on implied volatilities of traded options in our industry peers’ common stock because the volume of activity is relatively low. We intend to continue to consistently apply this methodology using the same or similar public companies until a sufficient amount of historical information regarding the volatility of our own common stock price becomes available, or unless circumstances change such that the identified companies are no longer similar to us, in which case, more suitable companies whose share prices are publicly available would be utilized in the calculation.
	·	Risk-Free Interest Rate. We base the risk-free interest rate used in the Black-Scholes valuation model on the yield available on U.S. Treasury zero-coupon issues with an equivalent remaining term of the stock options for each stock option group
	·	Dividend Yield. We have not paid and do not anticipate paying any cash dividends in the foreseeable future and, therefore, use an expected dividend yield of zero.
	The assumptions used to estimate the fair value of stock options granted to employees are as follows:
			Year Ended December 31,
			2014			2013			2012
	Expected volatility		54% - 56%			50% - 63%			57% - 59%
	Dividend rate			0%			0%			0%
	Risk-free interest rate		1.75% - 2.02%			0.63% - 2.02%			0.68% - 1.47%
	Expected term (in years)		6.02 - 6.50			4.47 - 6.27			5.28 - 6.27
	The assumptions used to estimate the fair value of ESPP awards are as follows:
			Year Ended
			31-Dec-14
	Expected volatility		45% - 49%
	Dividend rate			0%
	Risk-free interest rate		0.05% - 0.35%
	Expected term (in years)		0.50 - 1.5
	In addition to the assumptions used in the Black-Scholes option valuation model, we must also estimate a forfeiture rate to calculate the share-based compensation expense for our awards. Our forfeiture rate is based on an analysis of our actual forfeitures. We will continue to evaluate the appropriateness of the forfeiture rate based on actual forfeiture experience, analysis of employee turnover, and other factors. Changes in the estimated forfeiture rate can have a significant impact on our share-based compensation expense as the cumulative effect of adjusting the rate is recognized in the period the forfeiture estimate is changed. If a revised forfeiture rate is higher than the previously estimated forfeiture rate, an adjustment is made that will result in a decrease to the share-based compensation expense recognized in our financial statements. If a revised forfeiture rate is lower than the previously estimated forfeiture rate, an adjustment is made that will result in an increase to the share-based compensation expense recognized in our financial statements.
	We will continue to use judgment in evaluating the expected volatility, expected term, and forfeiture rate utilized in our share-based compensation expense calculations on a prospective basis. As we continue to accumulate additional data related to our common stock, we may refine our estimates of expected volatility, expected term, and forfeiture rates, which could materially impact our future share-based compensation expense.
In the years ended December 31, 2014 and 2013 we recorded $4.3 million and $1.7 million share-based compensation expense related to the accelerated vesting of certain stock options resulting from employee terminations, respectively. No such expense was recorded in the year ended December 31, 2012.
In September 2012, in connection with our sale of the Series D redeemable convertible preferred stock, the purchasers of the Series D redeemable convertible preferred stock conducted a tender offer to acquire approximately 8.0 million shares of common stock from employees, former employees, and other existing investors.  In connection with the tender offer, we waived any rights of first refusal or other transfer restrictions applicable to such shares.  The shares were repurchased from the stockholders at a purchase price of $9.62 per share. As a result of this transaction, we recorded a total of $8.6 million in share-based compensation expense in the year ended December 31, 2012 for the difference between the price paid for shares held by our employees and former employee stockholders and the estimated fair market value on the date of the transaction. Of the total share-based compensation expense, we recorded $20,000, $3.9 million, $1.0 million, and $3.7 million in cost of revenue, research and development, sales and marketing, and general and administrative expenses, respectively.
In connection with the tender offer, we recorded $8.3 million in deemed dividends, within additional paid-in capital, for the difference between the price paid for shares held by stockholders that were not employees or former employees and the estimated fair market value on the date of the transaction.
Early Exercise of Stock Options and Purchase of Unvested Stock Awards
Common stock purchased pursuant to an early exercise of stock options or unvested stock awards is not deemed to be outstanding for financial reporting purposes until those shares vest. Therefore, cash received in exchange for unvested shares is recorded as a liability and is transferred into common stock and additional paid-in capital as the shares vest. Upon termination of service, we may, at our discretion, repurchase unvested shares acquired through early exercise of stock options or purchase of unvested stock awards at a price equal to the price per share paid upon the exercise of such options or the purchase of such unvested stock awards. As of December 31, 2014 and 2013 there were 0.6 million and 0.8 million shares outstanding as a result of early exercise of stock options and purchase of unvested stock awards by our employees and directors that were classified as accrued liabilities for an aggregated amount of $2.1 million and $1.4 million, respectively.
Treasury Stock
We repurchased 0.5 million shares of common stock in the year ended December 31, 2011 and recorded the repurchased shares as treasury shares in the stockholders’ equity (deficit) section of the balance sheet at cost.

Net_Loss_per_Share

Net Loss per Share	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Net Loss per Share	Note 10. Net Loss Per Share
	We compute net loss per share of common stock in conformity with the two-class method required for participating securities. We consider all series of the redeemable convertible preferred stock to be participating securities as the holders of the preferred stock are entitled to receive a non-cumulative dividend on a pari passu basis in the event that a dividend is paid on common stock. We also consider shares of common stock issued upon the early exercise of stock awards subject to repurchase to be participating securities, because holders of such shares have non-forfeitable dividend rights in the event a dividend is paid on common stock. The holders of all series of the redeemable convertible preferred stock and the holders of shares of common stock acquired upon early exercise of stock options do not have a contractual obligation to share in our losses. As such, our net losses for the years ended December 31, 2014, 2013 and 2012 were not allocated to these participating securities. Upon the closing of the IPO in May 2014, all shares of our then-outstanding redeemable convertible preferred stock automatically converted into our common stock.
	Basic net loss per share attributable to common stockholders is computed by dividing the net loss attributable to common stockholders by the weighted-average number of shares of common stock outstanding during the period, less the weighted-average unvested common stock subject to repurchase. Diluted net loss per share is computed by giving effect to all potential shares of common stock, including common stock issuable upon conversion of the redeemable convertible preferred stock, outstanding share-based awards, and outstanding warrant, to the extent dilutive. Basic and diluted net loss per share was the same for each period presented as the inclusion of all potential common stock outstanding would have been anti-dilutive.
	The following table presents the calculation of basic and diluted net loss per share for the periods presented (in thousands, except per share data):
		Year Ended
		December 31,
		2014			2013						2012
					Class A			Class B			Class A			Class B
	Net loss	$	(67,415	)	$	(10,290	)	$	(12,281	)	$	(12,104	)	$	(12,261	)
	Less: Accretion of redeemable convertible preferred stock		(18	)		(22	)		(27	)		(25	)		(25	)
	Less: Deemed dividend to investors in relation to the tender offer		—			—			—			(4,136	)		(4,190	)
	Net loss attributable to common stockholders	$	(67,433	)	$	(10,312	)	$	(12,308	)	$	(16,265	)	$	(16,476	)
	Basic shares:
	Weighted-average common shares outstanding		54,383			9,881			12,964			9,881			12,153
	Less: Weighted-average common shares subject to repurchase		(812	)		—			(1,171	)		(130	)		(2,275	)
	Weighted-average common shares used to compute basic net loss per share		53,571			9,881			11,793			9,751			9,878
	Diluted shares:
	Weighted-average common shares used to compute diluted net loss per share		53,571			9,881			11,793			9,751			9,878
	Net loss per share attributable to common stockholders:
	Basic and diluted	$	(1.26	)	$	(1.04	)	$	(1.04	)	$	(1.67	)	$	(1.67	)
	The anti-dilutive securities excluded from the shares used to calculate the diluted net loss per common stock are as follows (in thousands):
		As of December 31,
		2014			2013			2012
	Redeemable convertible preferred stock		—			34,323			34,323
	Shares subject to outstanding common stock options		12,043			10,134			7,781
	Shares subject to common stock warrants		—			125			125
	Restricted stock units		3,064			811			—
			15,107			45,393			42,229

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Taxes	Note 11. Income Taxes
	The components of loss before provision for income taxes are as follows (in thousands):
		Year Ended December 31,
		2014			2013			2012
	U.S.	$	(66,755	)	$	(23,117	)	$	(24,739	)
	Foreign		(923	)		767			495
	Total	$	(67,678	)	$	(22,350	)	$	(24,244	)
	The income tax provision is composed of the following (in thousands):
		Year Ended December 31,
		2014			2013			2012
	Current tax provision:
	Federal	$	2		$	—		$	—
	State		1			37			2
	Foreign		567			189			126
			570			226			128
	Deferred tax provision:
	Federal		—			—			—
	State		—			—			—
	Foreign		(833	)		(5	)		(7	)
	Total provision for (benefit from) income taxes	$	(263	)	$	221		$	121
	Significant components of deferred tax assets are as follows (in thousands):
		As of December 31,
		2014			2013
	Deferred tax assets:
	Tax credit carryforward	$	197		$	15
	Net operating loss carryforward		33,878			19,278
	Share-based compensation		5,311			771
	Accrued liabilities and reserves		3,710			1,316
	Other		600			677
	Total deferred tax assets		43,696			22,057
	Less: valuation allowance		(39,496	)		(19,837	)
	Deferred tax assets, net of valuation allowance		4,200			2,220
	Deferred tax liabilities:
	Depreciation and amortization		(4,597	)		(2,207	)
	Net deferred tax assets (liabilities)	$	(397	)	$	13
	The following is a reconciliation of the statutory federal income tax rate and the effective tax rates:
		Year Ended December 31,
		2014			2013			2012
	Tax at federal statutory rate		34	%		34	%		34	%
	State tax provision, net of federal benefit		—			(0.2	)		—
	Share-based compensation		(5.5	)		(4.4	)		(11.1	)
	Valuation allowance		(27.9	)		(30.4	)		(23.3	)
	Other		(0.2	)		—			(0.1	)
	Effective tax rate		0.4	%		(1.0	%)		(0.5	%)
	We have not provided U.S. income taxes and foreign withholding taxes on the undistributed earnings of foreign subsidiaries as of December 31, 2014 because we intend to permanently reinvest such earnings outside of the U.S. If these foreign earnings were to be repatriated in the future, the related U.S. tax liability may be reduced by any foreign income taxes previously paid on these earnings. As of December 31, 2014, the cumulative amount of earnings upon which U.S. income taxes have not been provided is approximately $2.4 million. Determination of the amount of unrecognized deferred tax liability related to these earnings is not practicable.
	As of December 31, 2014, we had net operating loss carryforwards of approximately $133.0 million for federal income taxes and $47.5 million for state income taxes. If not utilized, these carryforwards will begin to expire in 2029 for federal purposes and 2031 for state purposes.
	We account for income taxes under an asset and liability approach. Deferred income taxes reflect the impact of temporary differences between assets and liabilities recognized for financial reporting purposes and such amounts recognized for income tax reporting purposes, net operating loss carryforwards, and other tax credits measured by applying currently enacted tax laws.
	As of December 31, 2014, we had research and development credit carryforwards of approximately, $2.5 million and $2.7 million for federal and state income taxes, respectively. If not utilized, the federal carryforwards will begin to expire in 2029. The state tax credit can be carried forward indefinitely.
	A share option exercise may result in a tax deduction prior to the actual recognition of the related excess tax benefit because we have a net operating loss carryforward. Our net operating losses include $40.9 million of excess stock option benefits that will be creditable to additional paid in capital when realized.
	Internal Revenue Code Section 382 limits the use of net operating loss and tax credit carryforwards in certain situations where changes occur in the stock ownership of a company. In the event that we had a change of ownership, utilization of the net operating loss and tax credit carryforwards may be restricted.
	A reconciliation of the beginning and ending amount of unrecognized tax benefits (excluding interest and penalties) is as follows (in thousands):
	Balance at December 31, 2012	$	1,939
	Additions for tax positions related to the prior year		—
	Additions for tax positions related to the current year		1,978
	Lapse of statutes of limitations		—
	Balance at December 31, 2013		3,917
	Additions for tax positions related to the prior year		(32	)
	Additions for tax positions related to the current year		2,070
	Lapse of statutes of limitations		—
	Balance at December 31, 2014	$	5,955
	As of December 31, 2014, we had $0.3 million of interest and penalties related to the uncertain tax positions.  We have elected to record interest and penalties in the financial statements as a component of income taxes.  Included in the balance of unrecognized tax benefits at December 31, 2014 and 2013 are potential benefits of $0.9 million and $0.5 million, respectively, which if recognized, would affect the effective tax rate.
	We are currently unaware of any uncertain tax positions that could result in significant additional payments, accruals, or other material deviation in this estimate over the next 12 months.
	Our 2009-2013 tax years remain subject to examination by the taxing authorities for U.S. federal, state, and foreign tax purposes.

Geographic_Information

Geographic Information	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Geographic Information	Note 12. Geographic Information
	Revenue
	The following table presents our revenue by geographic areas as determined based on the billing address of our customers (in thousands):
		Year Ended December 31,
		2014		2013		2012
	United States	$	72,217	$	42,415	$	22,445
	EMEA		35,856		19,125		10,257
	Other		18,976		10,505		5,526
	Total	$	127,049	$	72,045	$	38,228
	Long-Lived Assets
	The following table presents our long-lived assets by geographic areas (in thousands):
		As of		As of
		31-Dec-14		31-Dec-13
	United States	$	22,817	$	6,466
	EMEA		4,373		2,054
	Other		1,096		135
	Total	$	28,286	$	8,655
	The carrying value of capitalized internal-use software is excluded from the balance of long-lived assets presented in the table above.

Retirement_Plans

Retirement Plans	12 Months Ended
	Dec. 31, 2014
Compensation And Retirement Disclosure [Abstract]
Retirement Plans	Note 13. Retirement Plans
	We have a 401(k) retirement and savings plan made available to all United States employees. The 401(k) plan allows each participant to contribute up to an amount not to exceed an annual statutory maximum. We may, at our discretion, make matching contributions to the 401(k) plan. We are responsible for the administrative costs of the 401(k) plan. We have not made any contributions to the 401(k) plan since inception.

Subsequent_Events

Subsequent Events	12 Months Ended
	Dec. 31, 2014
Subsequent Events [Abstract]
Subsequent Events	Note 14. Subsequent Events
	In January 2015, we changed the time-off policy for U.S. employees. Under the new policy, salaried employees no longer accrue paid time off and a one-time payment of $2.4 million was made in January 2015 to U.S. salaried employees for the amount accrued as of such date.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Immaterial Error Correction	ERROR: Could not retrieve Word content for note block
Basis of Presentation	Basis of Presentation
	The consolidated financial statements have been prepared in accordance with United States generally accepted accounting principles, or GAAP. The consolidated financial statements include the accounts of Zendesk, Inc. and its subsidiaries. All intercompany balances and transactions have been eliminated upon consolidation.
Initial Public Offering	Initial Public Offering
	In May 2014, we completed our initial public offering, or IPO, in which we issued and sold 12.8 million shares of common stock at a public offering price of $9.00 per share. We received net proceeds of $103.1 million after deducting underwriting discounts and commissions of $8.1 million and other offering expenses of $3.8 million. Upon the closing of the IPO, all shares of our then-outstanding redeemable convertible preferred stock automatically converted into an aggregate of 34.3 million shares of common stock.
Reclassification	Reclassification
	Certain prior year amounts have been reclassified for consistency with the current year presentation.  These reclassifications had no effect on the reported results of operations.
Use of Estimates	Use of Estimates
	The preparation of consolidated financial statements in conformity with GAAP requires management to make certain estimates, judgments and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, as well as the reported amounts of revenue and expenses during the reported periods.
	Significant items subject to such estimates and assumptions include the fair value of our common stock and share-based awards, fair value of purchased intangible assets, goodwill, unrecognized tax benefits, useful lives of purchased intangible assets and property and equipment, and the capitalization and estimated useful life of our capitalized internal-use software.
	These estimates are based on information available as of the date of the financial statements; therefore, actual results could differ from those estimates.
Segment Information	Segment Information
	Our chief operating decision maker reviews the financial information presented on a consolidated basis for purposes of allocating resources and evaluating our financial performance. Accordingly, we have determined that we operate in a single operating segment.
Revenue Recognition	Revenue Recognition
	We generate substantially all of our revenue from subscription services, which are comprised of subscription fees from customer accounts on our customer service platform and, to a lesser extent, live chat software. Arrangements with customers do not provide the customer with the right to take possession of the software supporting our customer service platform or live chat software at any time, and are therefore accounted for as service contracts. Subscription service arrangements are generally non-cancelable and do not provide for refunds to customers in the event of cancellations or any other right of return. We record revenue net of sales or excise taxes.
	We commence revenue recognition when all of the following conditions are met:
	·	There is persuasive evidence of an arrangement;
	·	The service has been or is being provided to the customer;
	·	The collection of the fees is reasonably assured; and
	·	The amount of fees to be paid by the customer is fixed or determinable.
	Subscription revenue is recognized on a straight-line basis over the contractual term of the arrangement beginning on the date that our service is made available to the customer. Payments received in advance of services being rendered are recorded as deferred revenue and recognized on a straight-line basis over the requisite service period.
	Certain customers have arrangements that provide for a maximum number of users over the contract term, with usage measured monthly.  Revenue for these arrangements is recognized ratably over the contract terms. Incremental fees are incurred when the maximum number of users is exceeded, and any incremental fees are recognized as revenue ratably over the remaining contractual term.
	We derive an immaterial amount of revenue from implementation, voice, and training services, for which we recognize revenue upon completion.
Deferred Revenue	Deferred Revenue
	Deferred revenue consists primarily of customer billings in advance of revenue being recognized. We invoice customers for subscriptions to our customer service platform or live chat software in monthly, quarterly, or annual installments. Deferred revenue that is anticipated to be recognized during the succeeding 12-month period is recorded as current deferred revenue and the remaining portion is recorded as noncurrent deferred revenue. Deferred revenue associated with implementation, voice, and training services was immaterial as of December 31, 2014 and 2013.
Cost of Revenue	Cost of Revenue
	Cost of revenue consists primarily of personnel costs (including salaries, benefits, and share-based compensation) for employees associated with our platform infrastructure and our product support organizations, data center costs related to hosting our platform, depreciation and other expenses associated with our self-managed colocation data centers, amortization expense associated with capitalized internal-use software, payment processing fees, amortization expense associated with purchased intangible assets, and allocated shared costs.
Cash, Cash Equivalents, and Restricted Cash	Cash, Cash Equivalents, and Restricted Cash
	We consider all highly liquid investments purchased with a remaining maturity of three months or less to be cash equivalents. Cash and cash equivalents are recorded at fair value and consist primarily of bank deposits and money market funds.
	There was no restricted cash as of December 31, 2014 as compared to $0.2 million as of December 31, 2013.  As of December 31, 2014, the certificate of deposit pledged as collateral on credit cards had been refunded.
Marketable Securities	Marketable Securities
	Marketable securities consist of corporate bonds and auto and credit card asset backed securities. We classify marketable securities as available-for-sale at the time of purchase and reevaluate such classification as of each balance sheet date. All marketable securities are recorded at their estimated fair value. Unrealized gains and losses for available-for-sale securities are recorded in other comprehensive loss. We evaluate our investments to assess whether those with unrealized loss positions are other than temporarily impaired. Impairments are considered other than temporary if they are related to deterioration in credit risk or if it is likely we will sell the securities before the recovery of their cost basis. Realized gains and losses and declines in value determined to be other than temporary are determined based on the specific identification method and are reported in other expense, net in the consolidated statements of operations.
Accounts Receivable and Allowance for Doubtful Accounts	Accounts Receivable and Allowance for Doubtful Accounts
	Accounts receivable are recorded at the invoiced amount, net of allowance for doubtful accounts. The allowance is based upon historical loss patterns, the age of each past due invoice, and an evaluation of the potential risk of loss associated with delinquent accounts. Accounts receivable deemed uncollectable are charged against the allowance for doubtful accounts when identified.
	The allowance for doubtful accounts consists of the following activity (in thousands):
			Year Ended December 31,
			2014			2013
	Allowance for doubtful accounts, beginning balance		$	282		$	173
	Additions			843			301
	Write-offs			(861	)		(192	)
	Allowance for doubtful accounts, ending balance		$	264		$	282
Property and Equipment	Property and Equipment
	Property and equipment are stated at cost less accumulated depreciation. Depreciation is calculated using the straight-line method over the estimated useful lives of assets. Maintenance and repair costs are charged to expense as incurred. The estimated useful lives of our property and equipment are as follows:
	Furniture and fixtures			5 years
	Hosting equipment			3 years
	Computer equipment and software			3 years
	Leasehold improvements			Shorter of the lease term or estimated useful life
	Depreciation expense of assets acquired through capital leases is included in depreciation and amortization expense in the accompanying consolidated statements of operations.
Fair Value Measurements	Fair Value Measurements
	We measure certain financial assets at fair value using a fair value hierarchy. A financial instrument’s classification within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. Three levels of inputs may be used to measure fair value:
	Level 1—Observable inputs that reflect quoted prices (unadjusted) for identical assets or liabilities in active markets.
	Level 2—Other inputs that are directly or indirectly observable in the marketplace.
	Level 3—Unobservable inputs that are supported by little or no market activity.
	Our marketable securities are classified in either Level 1 or Level 2 and we have no financial assets or liabilities measured using Level 3 inputs. The fair value of our Level 1 financial assets is based on quoted market prices of the identical underlying security. The fair value of our Level 2 financial assets is based on inputs that are directly or indirectly observable in the market, including readily available pricing sources for identical underlying securities that may not be actively traded.
	For certain other financial instruments, including accounts receivable, accounts payable and other current liabilities, the carrying amounts approximate their fair value due to the relatively short maturity of these balances. Based on borrowing rates available to us for loans with similar terms and maturities, the carrying value of borrowings approximates fair value or Level 2 within the fair value hierarchy.
Capitalized Internal-Use Software Costs	Capitalized Internal-Use Software Costs
	We capitalize certain development costs incurred in connection with software development for our platform and software used in operations. Costs incurred in the preliminary stages of development are expensed as incurred. Once software has reached the development stage, internal and external costs, if direct and incremental, are capitalized until the software is substantially complete and ready for its intended use. Capitalization ceases upon completion of all substantial testing. We also capitalize costs related to specific upgrades and enhancements when it is probable the expenditures will result in additional functionality. Capitalized costs are recorded as part of property and equipment. Maintenance and training costs are expensed as incurred.
	Capitalized internal-use software is amortized on a straight-line basis over its estimated useful life and recorded in cost of revenue within the accompanying consolidated statements of operations. The weighted-average useful life of our capitalized internal-use software was 3.2 years as of December 31, 2014.
Business Combination	Business Combination
	When we acquire businesses, we allocate the purchase price to the net tangible and identifiable intangible assets. Any residual purchase price is recorded as goodwill. The allocation of the purchase price requires management to make significant estimates in determining the fair values of assets acquired and liabilities assumed, especially with respect to intangible assets. These estimates can include, but are not limited to, the cash flows that an asset is expected to generate in the future, the appropriate weighted-average cost of capital, and the cost savings expected to be derived from acquiring an asset. These estimates are inherently uncertain and unpredictable.
Goodwill, Purchased Intangible Assets, and Impairment Assessment of Long-Lived Assets	Goodwill, Purchased Intangible Assets, and Impairment Assessment of Long-Lived Assets
	Goodwill. Goodwill represents the excess purchase consideration of an acquired business over the fair value of the net tangible and identifiable intangible assets. Goodwill is evaluated for impairment annually in the third quarter, and whenever events or changes in circumstances indicate the carrying value of goodwill may not be recoverable. Triggering events that may indicate impairment include, but are not limited to, a significant adverse change in customer demand or business climate or a significant decrease in expected cash flows. No impairment charges were recorded during the year ended December 31, 2014. No goodwill was recorded prior to December 31, 2013.
	Purchased Intangible Assets. Purchased intangible assets consist of identifiable intangible assets, primarily developed technology and customer relationships, resulting from our acquisition. Intangible assets are recorded at fair value on the date of acquisition and amortized over their estimated economic lives following the pattern in which the economic benefits of the assets will be consumed, generally straight-line.
	Impairment of Long-Lived Assets. The carrying amounts of our long-lived assets, including property and equipment, capitalized internal-use software, and purchased intangible assets, are reviewed periodically for impairment whenever events or changes in circumstances indicate that the carrying value of these assets may not be recoverable or that the useful life is shorter than originally estimated. Recoverability of assets to be held and used is measured by comparing the carrying amount of an asset to future undiscounted net cash flows the asset is expected to generate over its remaining life. If the asset is considered to be impaired, the amount of any impairment is measured as the difference between the carrying value and the fair value of the impaired asset. If the useful life is shorter than originally estimated, we amortize the remaining carrying value over the new shorter useful life. No impairment of any long-lived assets was identified for the years ended December 31, 2014 and 2013.
Share Based Compensation	Share Based Compensation
	Share-based compensation expense to employees is measured based on the fair value of the awards on the grant date and recognized in our consolidated statements of operations over the period during which the employee is required to perform services in exchange for the award (generally the vesting period of the award). We estimate the fair value of stock options granted using the Black-Scholes option valuation model. We measure the fair value of restricted stock units, or RSUs, based on the fair value of the underlying shares on the date of grant. Compensation expense for awards with only service conditions is recognized over the vesting period of the applicable award using the straight-line method.
	All RSUs and certain options granted to employees prior to the IPO vest upon the satisfaction of both a service condition and a performance condition. These RSUs and stock options with both a service condition and performance condition are collectively referred to as “Performance Awards” in the following discussion. The service condition for substantially all of these awards is satisfied over four years. The performance condition was satisfied upon the occurrence of a qualifying liquidity event which occurred upon the effectiveness of the registration statement related to our IPO. No share-based compensation expense was recognized for the Performance Awards prior to the IPO as the performance condition had not been deemed probable to have been met. Upon the satisfaction of the performance condition, we recognized a cumulative share-based compensation expense for the portion of the Performance Awards that had met the service condition. For the year ended December 31, 2014, share-based compensation expense related to the Performance Awards recognized was $12.7 million, using the accelerated attribution method. The remaining unrecognized share-based compensation expense related to the Performance Awards will be recorded over the remaining requisite service period using the accelerated attribution method, net of estimated forfeitures.
	As of December 31 2014, we had a total of $74.5 million in future period share-based compensation expense related to all equity awards, net of estimated forfeitures, to be recognized over a weighted average period of 3.5 years.
Advertising Expense	Advertising Expense
	Advertising is expensed as incurred. For the years ended December 31, 2014, 2013, and 2012, advertising expense was $12.7 million, $6.5 million, and $3.5 million, respectively.
Income Taxes	Income Taxes
	We record income taxes using the asset and liability method, which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been recognized in our consolidated financial statements or tax returns. Deferred tax assets and liabilities are measured using the tax rates that are expected to apply to taxable income for the years in which those tax assets and liabilities are expected to be realized or settled. Valuation allowances are provided when necessary to reduce deferred tax assets to the amount expected to be realized.
	We recognize tax benefits from uncertain tax positions if it is more likely than not that the tax position will be sustained on examination by the taxing authorities based on the technical merits of the position. Although we believe that we have adequately reserved for our uncertain tax positions, we can provide no assurance that the final tax outcome of these matters will not be materially different. We make adjustments to these reserves when facts and circumstances change, such as the closing of a tax audit or the refinement of an estimate. To the extent that the final tax outcome of these matters is different than the amounts recorded, such differences will affect the provision for income taxes in the period in which such determination is made and could have a material impact on our financial condition and results of operations.
	We have elected to record interest accrued and penalties related to unrecognized tax benefits in the financial statements as a component of provision for income taxes.
Foreign Currency	Foreign Currency
	The functional currency of our foreign subsidiaries, with the exception of our Singapore subsidiary, is the U.S. dollar. Accordingly, monetary balance sheet accounts are remeasured using exchange rates in effect at the balance sheet dates and non-monetary items are remeasured at historical exchange rates. Expenses are generally remeasured at the average exchange rates for the period. Foreign currency remeasurement and transaction gains and losses are included in other expense, net on the statements of operations and were not material for the periods presented. The functional currency of our Singapore subsidiary is the Singapore dollar. Assets and liabilities are translated into U.S. dollars at exchange rates in effect at the balance sheet dates. Revenue and expenses are translated at the average exchange rates for the period. Amounts classified in stockholders’ equity (deficit) are translated at historical exchange rates.
Concentrations of Risk	Concentrations of Risk
	Financial instruments potentially exposing us to concentrations of credit risk consist primarily of cash and cash equivalents, restricted cash, marketable securities and accounts receivable. We place our cash and cash equivalents with high-credit-quality financial institutions.  However, we maintain balances in excess of the FDIC insurance limits. We do not require our customers to provide collateral to support accounts receivable and maintain an allowance for doubtful accounts receivable balances.
	At December 31, 2014 and 2013, there were no customers that represented more than 10% of the accounts receivable balance. There were no customers that individually exceeded 10% of our revenue in any of the periods presented.
Recently Issued Accounting Standards	Recently Issued Accounting Standards
	In February 2013, the Financial Accounting Statements Board, or FASB, issued Accounting Standards Update No. 2013-02 “Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income,” which requires an entity to disaggregate the total change of each component of other comprehensive income either on the face of the statement of operations or as a separate disclosure in the notes. The guidance became effective for reporting periods beginning after December 15, 2012 and is applied prospectively. We adopted this standard for the year ended December 31, 2013, and the adoption did not have any impact on our financial position, results of operations, or cash flows, as the amounts reclassified out of accumulated other comprehensive loss are not significant.
	In July 2013, the FASB issued Accounting Standards Update No. 2013-11 “Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists,” or ASU 2013-11, which provides guidance on the financial statement presentation of an unrecognized tax benefit when a net operating loss, or NOL, carryforward, a similar tax loss, or a tax credit carryforward exists. ASU 2013-11 supports the approach for companies to present an unrecognized tax benefit as a reduction of a deferred tax asset for a NOL or tax credit carryforward whenever the NOL or tax credit carryforward would be available to reduce the additional taxable income or tax due if the tax position is disallowed. This approach requires companies to assess whether to net the unrecognized tax benefit with a deferred tax asset as of the reporting date. We adopted this standard for the year ended December 31, 2014, and the adoption did not have a material effect on our financial position, results of operations, or cash flows.
	On May 28, 2014, the Financial Accounting Statements Board, or FASB, issued ASU 2014-09 regarding ASC Topic 606 “Revenue from Contracts with Customers.” This ASU provides principles for recognizing revenue for the transfer of promised goods or services to customers with the consideration to which the entity expects to be entitled in exchange for those goods or services. This ASU will be effective for our fiscal year beginning January 1, 2017. Early adoption is not permitted. We are currently evaluating the accounting, transition, and disclosure requirements of the standard and cannot currently estimate the financial statement impact of adoption.

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Schedule of Allowance for Doubtful Accounts	The allowance for doubtful accounts consists of the following activity (in thousands):
		Year Ended December 31,
		2014			2013
	Allowance for doubtful accounts, beginning balance	$	282		$	173
	Additions		843			301
	Write-offs		(861	)		(192	)
	Allowance for doubtful accounts, ending balance	$	264		$	282
Estimated Useful Lives of Property and Equipment	Property and equipment are stated at cost less accumulated depreciation. Depreciation is calculated using the straight-line method over the estimated useful lives of assets. Maintenance and repair costs are charged to expense as incurred. The estimated useful lives of our property and equipment are as follows:
	Furniture and fixtures		5 years
	Hosting equipment		3 years
	Computer equipment and software		3 years
	Leasehold improvements		Shorter of the lease term or estimated useful life

Acquisition_of_Zopim_Technolog1

Acquisition of Zopim Technologies (Tables)	12 Months Ended
	Dec. 31, 2014
Business Combinations [Abstract]
Schedule of Purchase Price Allocation for Acquisitions	The total adjusted purchase price was allocated to assets acquired and liabilities assumed as set forth below (in thousands).
	Net tangible liabilities assumed	$	(385	)
	Intangible assets		6,560
	Goodwill		9,594
	Total purchase price	$	15,769

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Assets Measured at Fair Value on Recurring Basis	The following tables present information about our financial assets measured at fair value on a recurring basis as of December 31, 2014 and 2013 based on the three-tier fair value hierarchy (in thousands):
		Fair Value Measurement at
		31-Dec-14
		Level 1		Level 2		Total
	Description
	Corporate bonds	$	—		40,345	$	40,345
	Money market funds		21,382		—		21,382
	Asset-backed securities		—		5,080		5,080
	Commercial paper		—		3,993		3,993
	U.S. treasury securities		—		1,991		1,991
	Total	$	21,382	$	51,409	$	72,791
	Included in cash and cash equivalents					$	21,382
	Included in marketable securities					$	51,409
		Fair Value Measurement at
		31-Dec-13
		Level 1		Level 2		Total
	Description
	Corporate bonds	$	—	$	12,114	$	12,114
	Money market funds		10,836		—		10,836
	Total	$	10,836	$	12,114	$	22,950
	Included in cash and cash equivalents					$	10,836
	Included in marketable securities					$	12,114
Schedule of Marketable Securities Classified by Contractual Maturities	The following table classifies our marketable securities by contractual maturities as of December 31, 2014 and 2013 (in thousands):
		31-Dec-14		31-Dec-13
	Due in one year	$	42,204	$	9,889
	Due in one to five years		9,205		2,225
	Total	$	51,409	$	12,114

Property_and_Equipment_Tables

Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2014
Property Plant And Equipment [Abstract]
Components of Property and Equipment	Property and equipment consists of the following (in thousands):
		31-Dec-14			31-Dec-13
	Capitalized internal-use software	$	18,541		$	11,104
	Furniture and fixtures		4,524			1,383
	Hosting equipment		14,085			7,931
	Computer equipment and software		4,310			1,680
	Leasehold improvements		15,144			1,717
	Construction in progress		3,546			341
	Total		60,150			24,156
	Less accumulated depreciation and amortization		(18,255	)		(8,725	)
	Property and equipment, net	$	41,895		$	15,431

Goodwill_and_Purchased_Intangi1

Goodwill and Purchased Intangibles Assets (Tables)	12 Months Ended
	Dec. 31, 2014
Goodwill And Intangible Assets Disclosure [Abstract]
Summary of Changes in Carrying Amount of Goodwill	The changes in the carrying amount of goodwill for the year ended December 31, 2014 are as follows (in thousands):
	Balance as of December 31, 2013	$	—
	Goodwill acquired		9,373
	Goodwill adjustments		221
	Foreign currency translation adjustments		(354	)
	Balance as of December 31, 2014	$	9,240
Summary of Intangible Assets Acquired	Purchased intangible assets related to the Zopim acquisition subject to amortization as of December 31, 2014 consist of the following (in thousands). No purchased intangible assets were recorded as of December 31, 2013.
		Cost			Accumulated			Foreign			Net		Remaining
					Amortization			Currency					Useful Life
								Translation
								Adjustments
													(In years)
	Developed technology	$	5,200		$	(1,118	)	$	(191	)	$	3,891		2.7
	Customer relationships		1,300			(244	)		(48	)		1,008		3.2
	Trade name		60			(45	)		(2	)		13		0.2
		$	6,560		$	(1,407	)	$	(241	)	$	4,912
Summary of Estimated Future Amortization Expense	Estimated future amortization expense as of December 31, 2014 is as follows (in thousands):
	2015	$	1,757
	2016		1,744
	2017		1,342
	2018		69
		$	4,912

Credit_Facility_Tables

Credit Facility (Tables)	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Schedule of Contractual Future Principal Repayments in Relation to Credit Facility	Contractual future principal repayments in relation to the credit facility are as follows for the year ending December 31 (in thousands):
	2015	$	3,041
	2016		3,118
	2017		793
		$	6,952

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2014
Commitments And Contingencies Disclosure [Abstract]
Schedule of Future Minimum Lease Payments by Year under Noncancelable Leases	As of December 31, 2014, the future minimum lease payments by year under noncancelable leases are as follows for the year ending December 31 (in thousands):
	2015	$	7,025
	2016		7,067
	2017		6,935
	2018		6,936
	2019		6,672
	Thereafter		12,707
	Total minimum lease payments	$	47,342

Common_Stock_and_Stockholders_1

Common Stock and Stockholders’ Equity (Deficit) (Tables)	12 Months Ended
	Dec. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Summary of Stock Option and RSU Activity	A summary of our stock option and RSU activity for the year ended December 31, 2014 is as follows (in thousands, except per share information):
					Options Outstanding									RSUs Outstanding
										Weighted
										Average							Weighted
		Shares						Weighted		Remaining		Aggregate					Average
		Available			Number of			Average		Contractual		Intrinsic		Outstanding			Grant Date
		for Grant			Shares			Exercise Price		Term		Value		RSUs			Fair Value
										(In years)
	Outstanding — January 1, 2014		1,854			10,134		$	2.82		8.15	$	50,185		811		$	6.76
	Increase in authorized shares		13,750
	Stock options granted		(6,308	)		6,308			11.4
	RSUs granted		(3,030	)											3,030			14.44
	Stock options exercised					(3,516	)		2.03
	RSUs vested														(370	)		9.56
	Unvested shares repurchased		4
	Stock options forfeited or canceled		883			(883	)		4.96
	RSUs forfeited or cancelled		407												(407	)		9.31
	Outstanding — December 31, 2014		7,560			12,043		$	7.39		8.29	$	204,467		3,064		$	13.69
	Options vested and expected to vest as of					10,742		$	7.07		8.21	$	185,866
	December 31, 2014
	Options vested and exercisable as of					4,293		$	3.87		7.34	$	88,025
	December 31, 2014
Assumptions Used to Estimate Fair Value of Stock Options Granted to Employees	The assumptions used to estimate the fair value of stock options granted to employees are as follows:
		Year Ended December 31,
		2014			2013			2012
	Expected volatility	54% - 56%			50% - 63%			57% - 59%
	Dividend rate		0%			0%			0%
	Risk-free interest rate	1.75% - 2.02%			0.63% - 2.02%			0.68% - 1.47%
	Expected term (in years)	6.02 - 6.50			4.47 - 6.27			5.28 - 6.27
Assumptions Used to Estimate Fair Value of ESPP Awards	The assumptions used to estimate the fair value of ESPP awards are as follows:
		Year Ended
		31-Dec-14
	Expected volatility	45% - 49%
	Dividend rate		0%
	Risk-free interest rate	0.05% - 0.35%
	Expected term (in years)	0.50 - 1.5

Net_Loss_per_Share_Tables

Net Loss per Share (Tables)	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Schedule of Computation of Basic and Diluted Net Loss per Share	The following table presents the calculation of basic and diluted net loss per share for the periods presented (in thousands, except per share data):
		Year Ended
		December 31,
		2014			2013						2012
					Class A			Class B			Class A			Class B
	Net loss	$	(67,415	)	$	(10,290	)	$	(12,281	)	$	(12,104	)	$	(12,261	)
	Less: Accretion of redeemable convertible preferred stock		(18	)		(22	)		(27	)		(25	)		(25	)
	Less: Deemed dividend to investors in relation to the tender offer		—			—			—			(4,136	)		(4,190	)
	Net loss attributable to common stockholders	$	(67,433	)	$	(10,312	)	$	(12,308	)	$	(16,265	)	$	(16,476	)
	Basic shares:
	Weighted-average common shares outstanding		54,383			9,881			12,964			9,881			12,153
	Less: Weighted-average common shares subject to repurchase		(812	)		—			(1,171	)		(130	)		(2,275	)
	Weighted-average common shares used to compute basic net loss per share		53,571			9,881			11,793			9,751			9,878
	Diluted shares:
	Weighted-average common shares used to compute diluted net loss per share		53,571			9,881			11,793			9,751			9,878
	Net loss per share attributable to common stockholders:
	Basic and diluted	$	(1.26	)	$	(1.04	)	$	(1.04	)	$	(1.67	)	$	(1.67	)
Schedule of Anti-Dilutive Securities Excluded from the Diluted per Common Stock Calculation	The anti-dilutive securities excluded from the shares used to calculate the diluted net loss per common stock are as follows (in thousands):
		As of December 31,
		2014			2013			2012
	Redeemable convertible preferred stock		—			34,323			34,323
	Shares subject to outstanding common stock options		12,043			10,134			7,781
	Shares subject to common stock warrants		—			125			125
	Restricted stock units		3,064			811			—
			15,107			45,393			42,229

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Components of Loss Before Provision for Income Taxes	The components of loss before provision for income taxes are as follows (in thousands):
		Year Ended December 31,
		2014			2013			2012
	U.S.	$	(66,755	)	$	(23,117	)	$	(24,739	)
	Foreign		(923	)		767			495
	Total	$	(67,678	)	$	(22,350	)	$	(24,244	)
Schedule of Income Tax Provision	The income tax provision is composed of the following (in thousands):
		Year Ended December 31,
		2014			2013			2012
	Current tax provision:
	Federal	$	2		$	—		$	—
	State		1			37			2
	Foreign		567			189			126
			570			226			128
	Deferred tax provision:
	Federal		—			—			—
	State		—			—			—
	Foreign		(833	)		(5	)		(7	)
	Total provision for (benefit from) income taxes	$	(263	)	$	221		$	121
Schedule of Significant Components of Deferred Tax Assets	Significant components of deferred tax assets are as follows (in thousands):
		As of December 31,
		2014			2013
	Deferred tax assets:
	Tax credit carryforward	$	197		$	15
	Net operating loss carryforward		33,878			19,278
	Share-based compensation		5,311			771
	Accrued liabilities and reserves		3,710			1,316
	Other		600			677
	Total deferred tax assets		43,696			22,057
	Less: valuation allowance		(39,496	)		(19,837	)
	Deferred tax assets, net of valuation allowance		4,200			2,220
	Deferred tax liabilities:
	Depreciation and amortization		(4,597	)		(2,207	)
	Net deferred tax assets (liabilities)	$	(397	)	$	13
Schedule of Reconciliation of the Statutory Federal Income Tax Rate and the Effective Tax Rates	The following is a reconciliation of the statutory federal income tax rate and the effective tax rates:
		Year Ended December 31,
		2014			2013			2012
	Tax at federal statutory rate		34	%		34	%		34	%
	State tax provision, net of federal benefit		—			(0.2	)		—
	Share-based compensation		(5.5	)		(4.4	)		(11.1	)
	Valuation allowance		(27.9	)		(30.4	)		(23.3	)
	Other		(0.2	)		—			(0.1	)
	Effective tax rate		0.4	%		(1.0	%)		(0.5	%)
Schedule of Unrecognized Tax Benefits	A reconciliation of the beginning and ending amount of unrecognized tax benefits (excluding interest and penalties) is as follows (in thousands):
	Balance at December 31, 2012	$	1,939
	Additions for tax positions related to the prior year		—
	Additions for tax positions related to the current year		1,978
	Lapse of statutes of limitations		—
	Balance at December 31, 2013		3,917
	Additions for tax positions related to the prior year		(32	)
	Additions for tax positions related to the current year		2,070
	Lapse of statutes of limitations		—
	Balance at December 31, 2014	$	5,955

Geographic_Information_Tables

Geographic Information (Tables)	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Schedule of Revenue by Geographic Areas	The following table presents our revenue by geographic areas as determined based on the billing address of our customers (in thousands):
		Year Ended December 31,
		2014		2013		2012
	United States	$	72,217	$	42,415	$	22,445
	EMEA		35,856		19,125		10,257
	Other		18,976		10,505		5,526
	Total	$	127,049	$	72,045	$	38,228
Schedule of Long-Lived Assets by Geographic Areas	The following table presents our long-lived assets by geographic areas (in thousands):
		As of		As of
		31-Dec-14		31-Dec-13
	United States	$	22,817	$	6,466
	EMEA		4,373		2,054
	Other		1,096		135
	Total	$	28,286	$	8,655

Organization_Additional_Inform

Organization - Additional Information (Details)	12 Months Ended
	Dec. 31, 2014
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Year founded	2007
Reincorporated date	2009-04

Summary_of_Significant_Account3

Summary of Significant Accounting Policies - Additional Information (Details) (USD $)	1 Months Ended	12 Months Ended
Share data in Thousands, except Per Share data, unless otherwise specified	31-May-14	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Summary Of Significant Accounting Policies [Line Items]
Share price		$24.37
Proceeds from initial public offering, net of underwriting discounts and commissions and other offering expenses	$103,100,000	$103,090,000
Underwriting discounts and commission on IPO	8,100,000
Offering expenses	3,800,000
Number of shares of common stock issued upon automatic conversion of convertible preferred stock	34,300	34,300
Restricted cash		0	200,000
Impairment of goodwill		0
Goodwill		9,240,000	0
Impairment of long lived asset		0	0
Future period share-based compensation expense		74,500,000
Future period share-based compensation expense, period to recognized		3 years 6 months
Advertising expense		12,700,000	6,500,000	3,500,000
Customer Concentration Risk | Accounts Receivable
Summary Of Significant Accounting Policies [Line Items]
Number of customers		0	0
Customer Concentration Risk | Accounts Receivable | Maximum
Summary Of Significant Accounting Policies [Line Items]
Percentage of total revenue or receivables		10.00%	10.00%
Customer Concentration Risk | Revenue
Summary Of Significant Accounting Policies [Line Items]
Number of customers		0	0
Customer Concentration Risk | Revenue | Maximum
Summary Of Significant Accounting Policies [Line Items]
Percentage of total revenue or receivables		10.00%	10.00%
Performance Awards
Summary Of Significant Accounting Policies [Line Items]
Share-based compensation expense		12,700,000
Service condition for performance awards		4 years
Capitalized Internal-Use Software
Summary Of Significant Accounting Policies [Line Items]
Weighted average useful life of capitalized internal use software		3 years 2 months 12 days
IPO
Summary Of Significant Accounting Policies [Line Items]
Shares of common stock sold in initial public offering	12,800
Share price	$9
Prior to IPO | Performance Awards
Summary Of Significant Accounting Policies [Line Items]
Share-based compensation expense		$0

Summary_of_Significant_Account4

Summary of Significant Accounting Policies - Schedule of Allowance for Doubtful Accounts - (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Accounting Policies [Abstract]
Allowance for doubtful accounts, beginning balance	$282	$173
Additions	843	301
Write-offs	-861	-192
Allowance for doubtful accounts, ending balance	$264	$282

Summary_of_Significant_Account5

Summary of Significant Accounting Policies - Estimated Useful Lives of Property and Equipment - (Details)	12 Months Ended
	Dec. 31, 2014
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Estimated useful lives of Property and equipment	5 years
Hosting Equipment
Property Plant And Equipment [Line Items]
Estimated useful lives of Property and equipment	3 years
Computer Equipment and Software
Property Plant And Equipment [Line Items]
Estimated useful lives of Property and equipment	3 years
Leasehold Improvements
Property Plant And Equipment [Line Items]
Estimated useful lives of Property and equipment	Shorter of the lease term or estimated useful life

Acquisition_of_Zopim_Technolog2

Acquisition of Zopim Technologies - Additional Information (Details) (Zopim, USD $)	0 Months Ended
In Millions, unless otherwise specified	Mar. 21, 2014
Business Acquisition [Line Items]
Business acquisition, fair value of consideration transferred	$15.80
Business acquisition, fair value of consideration transferred, cash	4.9
Business acquisition, fair value of consideration transferred, common stock	10.9
RSUs issued pursuant to retention plan, in connection with the acquisition	0.9
Cash to be pay pursuant to retention plan, in connection with the acquisition	3
Minimum
Business Acquisition [Line Items]
Number of months that cash and shares were held back	12 months
Maximum
Business Acquisition [Line Items]
Number of months that cash and shares were held back	18 months
Common Stock Consideration
Business Acquisition [Line Items]
Cash portion of fair value consideration transferred	2.4
Cash
Business Acquisition [Line Items]
Cash portion of fair value consideration transferred	$1.10

Fair_Value_Measurements_Financ

Fair Value Measurements - Financial Assets Measured at Fair Value on Recurring Basis (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of financial assets	$72,791	$22,950
Included in cash and cash equivalents	21,382	10,836
Included in marketable securities	51,409	12,114
Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of financial assets	21,382	10,836
Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of financial assets	51,409	12,114
Corporate bonds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of financial assets	40,345	12,114
Corporate bonds | Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of financial assets	40,345	12,114
Money market funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of financial assets	21,382	10,836
Money market funds | Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of financial assets	21,382	10,836
Asset-backed Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of financial assets	5,080
Asset-backed Securities | Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of financial assets	5,080
Commercial paper
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of financial assets	3,993
Commercial paper | Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of financial assets	3,993
U.S. treasury securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of financial assets	1,991
U.S. treasury securities | Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of financial assets	$1,991

Fair_Value_Measurements_Additi

Fair Value Measurements - Additional Information (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Fair Value Disclosures [Abstract]
Transfer from fair value measurement level 1 to level 2	$0
Transfer from fair value measurement level 2 to level 1	0
Gross unrealized gains or losses for cash equivalent and marketable securities	0	0
Securities that were in an unrealized loss position for more than 12 months.	$0	$0

Fair_Value_Measurements_Market

Fair Value Measurements - Marketable Securities by Contractual Maturities (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value Disclosures [Abstract]
Due in one year	$42,204	$9,889
Due in one to five years	9,205	2,225
Total	$51,409	$12,114

Property_and_Equipment_Compone

Property and Equipment - Components of Property and Equipment (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Property Plant And Equipment [Line Items]
Property and equipment, gross	$60,150	$24,156
Less accumulated depreciation and amortization	-18,255	-8,725
Property and equipment, net	41,895	15,431
Capitalized Internal-Use Software
Property Plant And Equipment [Line Items]
Property and equipment, gross	18,541	11,104
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property and equipment, gross	4,524	1,383
Hosting Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	14,085	7,931
Computer Equipment and Software
Property Plant And Equipment [Line Items]
Property and equipment, gross	4,310	1,680
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	15,144	1,717
Construction in Progress
Property Plant And Equipment [Line Items]
Property and equipment, gross	$3,546	$341

Property_and_Equipment_Additio

Property and Equipment - Additional Information (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property Plant And Equipment [Abstract]
Depreciation expense	$6,100,000	$2,900,000	$1,100,000
Capitalized internal-use software	10,500,000	4,800,000	3,600,000
Share-based compensation capitalized in internal-use software costs	2,476,000	143,000	85,000
Amortization expense of capitalized internal-use software	3,800,000	2,300,000	1,400,000
Carrying value of capitalized internal-use software	13,600,000	6,800,000
Construction in progress	$3,500,000	$300,000

Goodwill_and_Purchased_Intangi2

Goodwill and Purchased Intangibles Assets - Summary of Changes in Carrying Amount of Goodwill (Details) (USD $)	12 Months Ended
	Dec. 31, 2014
Goodwill And Intangible Assets Disclosure [Abstract]
Beginning balance	$0
Goodwill acquired	9,373,000
Goodwill adjustments	221,000
Foreign currency translation adjustments	-354,000
Ending balance	$9,240,000

Goodwill_and_Purchased_Intangi3

Goodwill and Purchased Intangibles Assets - Additional Information (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Goodwill And Intangible Assets Disclosure [Abstract]
Cost	$6,560,000	$0
Amortization expense	$1,400,000	$0

Goodwill_and_Purchased_Intangi4

Goodwill and Purchased Intangibles Assets - Summary of Intangible Assets Acquired (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Finite Lived Intangible Assets [Line Items]
Cost	$6,560	$0
Accumulated Amortization	-1,407
ForeignCurrencyTranslationAdjustments	-241
Net	4,912
Developed Technology
Finite Lived Intangible Assets [Line Items]
Cost	5,200
Accumulated Amortization	-1,118
ForeignCurrencyTranslationAdjustments	-191
Net	3,891
RemainingUseful Life	2 years 8 months 12 days
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Cost	1,300
Accumulated Amortization	-244
ForeignCurrencyTranslationAdjustments	-48
Net	1,008
RemainingUseful Life	3 years 2 months 12 days
Trade Name
Finite Lived Intangible Assets [Line Items]
Cost	60
Accumulated Amortization	-45
ForeignCurrencyTranslationAdjustments	-2
Net	$13
RemainingUseful Life	2 months 12 days

Goodwill_and_Purchased_Intangi5

Goodwill and Purchased Intangibles Assets - Summary of Estimated Future Amortization Expense (Details) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Goodwill And Intangible Assets Disclosure [Abstract]
2015	$1,757
2016	1,744
2017	1,342
2018	69
Net	$4,912

Credit_Facility_Additional_Inf

Credit Facility - Additional Information (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Jun. 30, 2012
Line Of Credit Facility [Line Items]
Percentage of equity pledged in international subsidiaries as collateral	65.00%
Silicon Valley Bank
Line Of Credit Facility [Line Items]
Shares of common stock to purchase by warrants issued			125,000
Warrants exercise price			$1.92
Warrants, expiration date	Jun-19
Silicon Valley Bank | Revolving Credit Facility
Line Of Credit Facility [Line Items]
Credit facility	20,000,000
Line of credit outstanding amount	0	20,000,000
Percentage of interest rate above the prime rate		2.00%
Silicon Valley Bank | Equipment Line Of Credit
Line Of Credit Facility [Line Items]
Credit facility	10,000,000
Line of credit outstanding amount	7,000,000	3,800,000
Credit facility interest rate	2.50%
Credit facility, outstanding balance payable period	30 months
Credit facility, frequency of payment and payment terms	The outstanding balance as of September 14, 2014 is payable in 30 equal monthly installments, with the last payment due on March 14, 2017.
Final payment on principal amount	300,000

Credit_Facility_Schedule_of_Co

Credit Facility - Schedule of Contractual Future Principal Repayments in Relation to Credit Facility (Details) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Debt Disclosure [Abstract]
2015	$3,041
2016	3,118
2017	793
Contractual future principal repayments, Total	$6,952

Commitments_and_Contingencies_1

Commitments and Contingencies - Additional Information (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Registration Payment Arrangement [Line Items]
Lease agreements description	In 2013, we renewed the lease of our office in San Francisco through October 2019, with an option to renew for an additional 7 years and 8 months. We also entered into a lease for additional office space in San Francisco with an 8-year term, renewable for an additional period of 5 years.
Rent expense	$6,800,000	$2,300,000	$1,600,000
Current portion of capital leases	10,000	364,000
Accumulated depreciation on leased assets	1,000,000	700,000
Letters of credit outstanding amount	$3,700,000	$3,800,000
Letters of credit description	The letters of credit are collateralized by substantially all of our assets, excluding our intellectual property. These letters of credit renew annually and mature at various dates through October 31, 2022
Letters of credit expiry date	31-Oct-22
Capital Lease Agreements
Registration Payment Arrangement [Line Items]
Lease expiration date	31-Mar-15
Headquarters
Registration Payment Arrangement [Line Items]
Lease expiration date	31-Oct-19
Lease agreement renewal term	7 years 8 months
Additional office space
Registration Payment Arrangement [Line Items]
Lease agreement renewal term	5 years
Lease agreement term	8 years

Common_Stock_and_Stockholders_2

Common Stock and Stockholders' Equity (Deficit) - Additional Information (Details) (USD $)	1 Months Ended		12 Months Ended
	31-May-14	Apr. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 2012
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares of common stock issued upon automatic conversion of convertible preferred stock	34,300,000		34,300,000
Reverse stock split of common stock		0.5
Common stock, shares authorized			400,000,000	125,000,000
Common stock, shares outstanding			75,500,000	23,200,000
Common Stock, conversion basis			Upon the completion of our IPO, each share of Series B common stock was converted into Series A common stock on a one-for-one basis, and the Series A common stock was redesignated as common stock.
Common stock, par value			$0.01	$0.01
Proceeds from exercise of employee stock options			$7,229,000	$1,793,000	$2,125,000
Share-based compensation, number of shares available for grant			7,560,000	1,854,000
Intrinsic value of options exercised			66,200,000	4,600,000	1,800,000
Weighted-average grant date fair value of stock options			$7.22	$1.62	$0.56
Share price			$24.37
Share-based compensation			32,139,000	4,854,000	9,640,000
Shares outstanding as a result of early exercise of stock options and purchase of unvested stock awards			600,000	800,000
Accrued liability for shares outstanding as a result of early exercise of stock options and purchase of unvested stock awards			2,100,000	1,400,000
Shares repurchased as treasury shares			4,000			500,000
Series D Redeemable Convertible Preferred Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share price							$9.62
Shares offered by preferred shareholders							8,000,000
Share-based compensation					8,600,000
Deemed dividends							8,300,000
Cost of Revenue
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation					20,000
Research and Development
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation					3,900,000
Sales and Marketing
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation					1,000,000
General and Administrative
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation					3,700,000
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share based compensation related to accelerated vesting			4,300,000	1,700,000	0
Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation, initial reserves and authorized shares of common stock	3,600,000
Shares reserved and available for issuance under the plan, automatically increase each January	1,500,000
Share-based compensation, increase in number of shares reserved and available for issuance as percentage of shares issued and outstanding	1.00%
Percentage of purchase price of shares lower of the fair market value of common stock employees are able to purchase shares			85.00%
Common shares purchased			400,000
Weighted-average price per share			$7.65
Proceeds from exercise of employee stock options			$3,300,000
Shares of common stock available for issuance			3,200,000
2014 Stock Option and Grant Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation, initial reserves and authorized shares of common stock	7,500,000
Share-based compensation, increase in number of shares reserved and available for issuance as percentage of shares issued and outstanding			5.00%
Share-based compensation, number of shares available for grant			8,300,000
Series A
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, shares authorized				80,000,000
Common stock, shares outstanding				9,900,000
Series B
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, shares authorized				30,000,000
Common stock, shares outstanding				13,300,000
Common stock, shares unvested				800,000

Common_Stock_and_Stockholders_3

Common Stock and Stockholders' Equity (Deficit) - Summary of Stock Option and RSU Activity (Details) (USD $)	12 Months Ended
Share data in Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2011
Shares Available for Grant
Balance at the beginning of the period	1,854
Increase in authorized shares	13,750
Stock options granted	6,308
RSUs granted	3,030
Unvested shares repurchased	4		500
Stock options forfeited or canceled	883
RSUs forfeited or cancelled	407
Balance at the end of the period	7,560	1,854
Number of Shares
Balance at the beginning of the period	10,134
Stock options granted	6,308
Stock options exercised	-3,516
Stock options forfeited or canceled	-883
Balance at the end of the period	12,043	10,134
Options vested and expected to vest at the end of the period	10,742
Options vested and exercisable at the end of the period	4,293
Weighted-Average Exercise Price
Balance at the beginning of the period	$2.82
Stock options granted	$11.40
Stock options exercised	$2.03
Stock options forfeited or canceled	$4.96
Balance at the end of the period	$7.39	$2.82
Options vested and expected to vest at the end of the period	$7.07
Options vested and exercisable at the end of the period	$3.87
Weighted Average Remaining Contractual Term
Options Outstanding, Weighted-average remaining contractual term	8 years 3 months 15 days	8 years 1 month 24 days
Options Outstanding, Weighted-average remaining contractual term	8 years 3 months 15 days	8 years 1 month 24 days
Options vested and expected to vest, Weighted-average remaining contractual term	8 years 2 months 16 days
Options vested and exercisable, Weighted-average remaining contractual term	7 years 4 months 2 days
Aggregate Intrinsic Value
Options Outstanding, Aggregate Intrinsic Value, Balance at beginning of period	$50,185
Options Outstanding, Aggregate Intrinsic Value, Balance at end of period	204,467	50,185
Options vested and expected to vest, Aggregate Intrinsic Value, Balance at end of period	185,866
Options vested and exercisable, Aggregate Intrinsic Value, Balance at end of period	$88,025
Outstanding RSUs
Balance at the beginning of the period	811
RSUs granted	3,030
RSUs vested	-370
RSUs forfeited or cancelled	-407
Balance at the end of the period	3,064	811
Weighted-Average Grant Date Fair Value
Balance at the beginning of the period	$6.76
RSUs granted	$14.44
RSUs vested	$9.56
RSUs forfeited or cancelled	$9.31
Balance at the end of the period	$13.69	$6.76

Common_Stock_and_Stockholders_4

Common Stock and Stockholders' Equity (Deficit) - Assumptions Used to Estimate Fair Value of Stock Options Granted to Employees (Details) (Stock Options)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Dividend rate	0.00%	0.00%	0.00%
Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected volatility	54.00%	50.00%	57.00%
Risk-free interest rate	1.75%	0.63%	0.68%
Expected term (in years)	6 years 7 days	4 years 5 months 19 days	5 years 3 months 11 days
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected volatility	56.00%	63.00%	59.00%
Risk-free interest rate	2.02%	2.02%	1.47%
Expected term (in years)	6 years 6 months	6 years 3 months 7 days	6 years 3 months 7 days

Common_Stock_and_Stockholders_5

Common Stock and Stockholders' Equity (Deficit) - Assumptions Used to Estimate Fair Value of ESPP Awards (Details) (ESPP Awards)	12 Months Ended
	Dec. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Dividend rate	0.00%
Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected volatility	45.00%
Risk-free interest rate	0.05%
Expected term (in years)	6 months
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected volatility	49.00%
Risk-free interest rate	0.35%
Expected term (in years)	1 year 6 months

Net_Loss_per_Share_Computation

Net Loss per Share - Computation of Basic and Diluted Net Loss per Share of Common Stock (Details) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share Basic [Line Items]
Net loss	($67,415)	($22,571)	($24,365)
Accretion of redeemable convertible preferred stock	-18	-49	-50
Deemed dividend to investors in relation to the tender offer			-8,326
Net loss attributable to common stockholders	-67,433	-22,620	-32,741
Basic shares:
Weighted-average common shares outstanding	54,383
Weighted-average common shares subject to repurchase	-812
Weighted-average common shares used to compute basic net loss per share	53,571
Diluted shares:
Weighted-average common shares used to compute diluted net loss per share	53,571
Net loss per share attributable to common stockholders:
Net loss per share attributable to common stockholders, basic and diluted	($1.26)	($1.04)	($1.67)
Class A
Earnings Per Share Basic [Line Items]
Net loss		-10,290	-12,104
Accretion of redeemable convertible preferred stock		-22	-25
Deemed dividend to investors in relation to the tender offer			-4,136
Net loss attributable to common stockholders		-10,312	-16,265
Basic shares:
Weighted-average common shares outstanding		9,881	9,881
Weighted-average common shares subject to repurchase			-130
Weighted-average common shares used to compute basic net loss per share		9,881	9,751
Diluted shares:
Weighted-average common shares used to compute diluted net loss per share		9,881	9,751
Net loss per share attributable to common stockholders:
Net loss per share attributable to common stockholders, basic and diluted		($1.04)	($0.83)
Class B
Earnings Per Share Basic [Line Items]
Net loss		-12,281	-12,261
Accretion of redeemable convertible preferred stock		-27	-25
Deemed dividend to investors in relation to the tender offer			-4,190
Net loss attributable to common stockholders		($12,308)	($16,476)
Basic shares:
Weighted-average common shares outstanding		12,964	12,153
Weighted-average common shares subject to repurchase		-1,171	-2,275
Weighted-average common shares used to compute basic net loss per share		11,793	9,878
Diluted shares:
Weighted-average common shares used to compute diluted net loss per share		11,793	9,878
Net loss per share attributable to common stockholders:
Net loss per share attributable to common stockholders, basic and diluted		($1.04)	($0.83)

Net_Loss_per_Share_Schedule_of

Net Loss per Share - Schedule of Anti-Dilutive Securities Excluded from the Diluted per Common Stock Calculation (Details)	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]
Antidilutive securities excluded from computation of earnings per common stock amount	15,107	45,393	42,229
Redeemable Convertible Preferred Stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per common stock amount		34,323	34,323
Shares Subject to Outstanding Common Stock Options
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per common stock amount	12,043	10,134	7,781
Shares subject to common stock warrants
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per common stock amount		125	125
Restricted Stock Units
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per common stock amount	3,064	811

Income_Taxes_Components_of_Los

Income Taxes - Components of Loss Before Provision for Income Taxes (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
U.S.	($66,755)	($23,117)	($24,739)
Foreign	-923	767	495
Loss before provision for (benefit from) income taxes	($67,678)	($22,350)	($24,244)

Income_Taxes_Schedule_of_Incom

Income Taxes - Schedule of Income Tax Provision (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current tax provision:
Federal	$2	$0	$0
State	1	37	2
Foreign	567	189	126
Total current tax provision	570	226	128
Deferred tax provision:
Federal	0	0	0
State	0	0	0
Foreign	-833	-5	-7
Total provision for (benefit from) income taxes	($263)	$221	$121

Income_Taxes_Schedule_of_Signi

Income Taxes - Schedule of Significant Components of Deferred Tax Assets (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Deferred tax assets:
Tax credit carryforward	$197	$15
Net operating loss carryforward	33,878	19,278
Share-based compensation	5,311	771
Accrued liabilities and reserves	3,710	1,316
Other	600	677
Total deferred tax assets	43,696	22,057
Less: valuation allowance	-39,496	-19,837
Deferred tax assets, net of valuation allowance	4,200	2,220
Deferred tax liabilities:
Depreciation and amortization	-4,597	-2,207
Net deferred tax assets (liabilities)	($397)	$13

Income_Taxes_Schedule_of_Recon

Income Taxes - Schedule of Reconciliation of the Statutory Federal Income Tax Rate and the Effective Tax Rates (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Tax at federal statutory rate	34.00%	34.00%	34.00%
State tax provision, net of federal benefit		-0.20%
Share-based compensation	-5.50%	-4.40%	-11.10%
Valuation allowance	-27.90%	-30.40%	-23.30%
Other	-0.20%		-0.10%
Effective tax rate	0.40%	-1.00%	-0.50%

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Line Items]
Cumulative amount of earnings	$2.40
Excess stock option benefits creditable to additional paid in capital	40.9
Interest and penalties related to uncertain tax positions	0.3
Potential benefits, which if recognized, would affect the effective tax rate.	0.9	0.5
Federal
Income Tax Disclosure [Line Items]
Net operating loss carryforwards	133
Tax credit carryforwards expiration year	2029
Research and development credit carryforwards	2.5
Research and development credit carryforwards expiration year	2029
State
Income Tax Disclosure [Line Items]
Net operating loss carryforwards	47.5
Tax credit carryforwards expiration year	2031
Research and development credit carryforwards	$2.70

Income_Taxes_Schedule_of_Unrec

Income Taxes - Schedule of Unrecognized Tax Benefits (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Unrecognized tax benefits, Beginning balance	$3,917	$1,939
Additions for tax positions related to the prior year		0
Additions for tax positions related to the prior year	-32
Additions for tax positions related to the current year	2,070	1,978
Lapse of statutes of limitations	0	0
Unrecognized tax benefits, Ending balance	$5,955	$3,917

Geographic_Information_Schedul

Geographic Information - Schedule of Revenue by Geographic Areas (Details) (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]
Revenue	$127,049	$72,045	$38,228
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	72,217	42,415	22,445
EMEA
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	35,856	19,125	10,257
Other
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	$18,976	$10,505	$5,526

Geographic_Information_Schedul1

Geographic Information - Schedule of Long-Lived Assets by Geographic Areas (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	$28,286	$8,655
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	22,817	6,466
EMEA
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	4,373	2,054
Other
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	$1,096	$135

Subsequent_Events_Additional_I

Subsequent Events - Additional Information (Details) (USD $)	1 Months Ended
In Millions, unless otherwise specified	Jan. 31, 2015
Subsequent Events [Abstract]
One-time payment for employee	$2.40