Zendesk (ZEN) 10-Q 7 May 15 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2015	Apr. 30, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	FALSE
Document Period End Date	31-Mar-15
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
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		86,093,863

CONDENSED_CONSOLIDATED_BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Current Assets:
Cash and cash equivalents	$264,222	$80,265
Marketable securities	44,855	42,204
Accounts receivable, net of allowance for doubtful accounts of $475 and $264 as of March 31, 2015 and December 31, 2014, respectively	12,001	11,523
Prepaid expenses and other current assets	6,047	5,013
Total current assets	327,125	139,005
Marketable securities, noncurrent	7,501	9,205
Property and equipment, net	43,351	41,895
Goodwill and intangible assets, net	13,255	14,152
Other assets	1,911	1,531
Total assets	393,143	205,788
Current liabilities:
Accounts payable	3,778	4,763
Accrued liabilities	8,893	7,841
Accrued compensation and related benefits	11,370	11,738
Deferred revenue	54,891	50,756
Current portion of credit facility	3,060	3,041
Current portion of capital leases		10
Total current liabilities	81,992	78,149
Deferred revenue, noncurrent	629	823
Credit facility, noncurrent	3,139	3,911
Other liabilities	9,114	9,199
Total liabilities	94,874	92,082
Commitments and contingencies (Note 7)
Stockholders’ equity:
Preferred stock, par value $0.01 per share: 10.0 million shares authorized as of March 31, 2015 and December 31, 2014; no shares issued and outstanding as of March 31, 2015 and December 31, 2014
Common stock, par value $0.01 per share: 400.0 million shares authorized; 86.4 million and 76.1 million shares issued; 85.9 million and 75.6 million shares outstanding as of March 31, 2015 and December 31, 2014, respectively (including 0.5 million and 0.6 million shares subject to repurchase, legally issued and outstanding, as of March 31, 2015 and December 31, 2014, respectively)	859	755
Additional paid-in capital	450,027	246,000
Accumulated other comprehensive loss	-928	-528
Accumulated deficit	-151,037	-131,869
Treasury stock at cost (0.5 million shares as of March 31, 2015 and December 31, 2014)	-652	-652
Total stockholders’ equity	298,269	113,706
Total liabilities and stockholders’ equity	$393,143	$205,788

CONDENSED_CONSOLIDATED_BALANCE1

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, except Share data, unless otherwise specified
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts	$475	$264
Preferred stock, par value	$0.01	$0.01
Preferred stock, shares authorized	10,000,000	10,000,000
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	400,000,000
Common stock, shares issued	86,400,000	76,100,000
Common stock, shares outstanding	85,900,000	75,600,000
Common stock shares outstanding, subject to repurchase	500,000	600,000
Treasury stock, shares	500,000	500,000

CONDENSED_CONSOLIDATED_STATEME

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014
Income Statement [Abstract]
Revenue	$42,234		$25,092
Cost of revenue	14,290	[1]	8,995	[1]
Gross profit	27,944		16,097
Operating expenses:
Research and development	13,259	[1]	5,178	[1]
Sales and marketing	23,403	[1]	14,287	[1]
General and administrative	10,127	[1]	6,384	[1]
Total operating expenses	46,789	[1]	25,849	[1]
Operating loss	-18,845		-9,752
Other expense, net	-230		-458
Loss before provision for income taxes	-19,075		-10,210
Provision for income taxes	93		49
Net loss	-19,168		-10,259
Accretion of redeemable convertible preferred stock			-12
Net loss attributable to common stockholders	($19,168)		($10,271)
Net loss per share attributable to common stockholders, basic and diluted	($0.25)		($0.45)
Weighted-average shares used to compute net loss per share attributable to common stockholders, basic and diluted	76,338		22,762
[1]	Includes share-based compensation expense as follows:

CONDENSED_CONSOLIDATED_STATEME1

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (Parenthetical) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Cost of Revenue
Share-based compensation expense	$891,000	$90,000
Research and Development
Share-based compensation expense	4,064,000	310,000
Sales and Marketing
Share-based compensation expense	2,432,000	490,000
General and Administrative
Share-based compensation expense	$2,842,000	$934,000

CONDENSED_CONSOLIDATED_STATEME2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net loss	($19,168)	($10,259)
Other comprehensive loss, net of tax:
Net change in unrealized gain on available-for-sale investments	40	-2
Foreign currency translation loss	-440	198
Comprehensive loss	($19,568)	($10,063)

CONDENSED_CONSOLIDATED_STATEME3

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities
Net loss	($19,168)	($10,259)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	4,223	1,808
Share-based compensation	10,229	1,824
Other	172	136
Changes in operating assets and liabilities:
Accounts receivable	-635	-1,175
Prepaid expenses and other current assets	-793	-853
Other assets and liabilities	-638	751
Accounts payable	-1,012	-777
Accrued liabilities	1,323	1,224
Accrued compensation and related benefits	-2,837	1,618
Deferred revenue	3,941	4,108
Net cash used in operating activities	-5,195	-1,595
Cash flows from investing activities
Purchases of property and equipment	-3,356	-3,580
Internal-use software development costs	-1,317	-1,801
Purchases of marketable securities	-14,801
Proceeds from maturities of marketable securities	7,520	1,400
Proceeds from sale of marketable securities	6,141
Cash paid for the acquisition of Zopim, net of cash acquired	-548	-1,784
Net cash used in investing activities	-6,361	-5,765
Cash flows from financing activities
Proceeds from follow-on public offering, net of issuance costs	190,794
Proceeds from exercise of employee stock options	2,938	2,393
Taxes paid related to net share settlement of equity awards	-82
Proceeds from issuance of common stock from employee stock purchase plan	2,468
Proceeds from issuance of debt		3,940
Principal payments on debt	-753	-1,762
Principal payments on capital lease obligations	-10	-89
Net cash provided by financing activities	195,355	4,482
Effect of exchange rate changes on cash and cash equivalents	158	8
Net increase (decrease) in cash and cash equivalents	183,957	-2,870
Cash and cash equivalents at the beginning of period	80,265	53,725
Cash and cash equivalents at the end of period	264,222	50,855
Supplemental cash flow data:
Cash paid for interest and income taxes	122	467
Non-cash investing and financing activities:
Issuance of common stock for the acquisition of Zopim		10,982
Vesting of early exercised stock options	311	412
Purchases of property and equipment in accounts payable and accrued expenses	14	3,495
Property and equipment acquired through tenant improvement allowances	174	584
Share-based compensation capitalized in internal-use software development costs	545	49
Follow-on offering related costs not yet paid for	$605

Overview_and_Basis_of_Presenta

Overview and Basis of Presentation	3 Months Ended
	Mar. 31, 2015
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Overview and Basis of Presentation	Note 1. Overview and Basis of Presentation
	Company and Background
	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, the “Company”, “our”, or “we” in these notes refer to Zendesk, Inc. and its subsidiaries on a consolidated basis.
	Basis of Presentation
	These unaudited condensed consolidated financial statements have been prepared in accordance with United States generally accepted accounting principles, or GAAP, and applicable rules and regulations of the Securities and Exchange Commission, or SEC, regarding interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. Therefore, these condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes included in our Annual Report on Form 10-K for the year ended December 31, 2014, filed on February 17, 2015. There have been no changes to our significant accounting policies described in the Annual Report on Form 10-K that have had a material impact on our condensed consolidated financial statements and related notes.
	The consolidated balance sheet as of December 31, 2014 included herein was derived from the audited financial statements as of that date. The unaudited condensed consolidated financial statements reflect all normal recurring adjustments necessary to present fairly the financial position, results of operations, our comprehensive loss and cash flows for the interim periods, but are not necessarily indicative of the results of operations to be anticipated for the full year ending December 31, 2015.
	Follow-On Public Offering
	In March 2015, we completed a follow-on public offering, in which we issued 8.8 million shares of our common stock at a public offering price of $22.75 per share. We received net proceeds of $190.1 million after deducting underwriting discounts and commissions of $8.7 million and other offering expenses of $0.9 million.
	Initial Public Offering and Share-based Compensation
	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.
	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.  Compensation expense for awards with both service and performance conditions is recognized over the longer period required to achieve both conditions using the accelerated attribution 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. The remaining unrecognized share-based compensation expense related to the Performance Awards are being recorded over the remaining requisite service period using the accelerated attribution method, net of estimated forfeitures.
	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 (through the date of our IPO) and share-based awards, fair value of acquired intangible assets, goodwill, unrecognized tax benefits, useful lives of 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.
	Concentrations of Risk
	At March 31, 2015, there were no customers that represented more than 10% of our accounts receivable balance.  At March 31, 2014, one customer represented 14% and a second customer represented 12% of our total accounts receivable balance.  There were no customers that individually exceeded 10% of our revenue during the three months ended March 31, 2015 or 2014.
	Recently Issued and Adopted Accounting Pronouncements
	On May 28, 2014, the FASB issued ASU 2014-09 regarding ASC Topic 606 “Revenue from Contracts with Customers.” This ASU provides principles for recognizing revenue to which an entity expects to be entitled for the transfer of promised goods or services to customers. This ASU is expected to be effective no earlier than 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

Acquisition	3 Months Ended
	Mar. 31, 2015
Business Combinations [Abstract]
Acquisition	Note 2. Acquisition
	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. As of 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 that was held back between 12 and 18 months as partial security for standard indemnification obligations.  In the three months ended March 31, 2015, we released $0.5 million of cash and $1.2 million of common stock consideration that was held back, based on the fair value of our common stock on the date of the acquisition.  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.  In the three months ended March 31, 2015, RSUs for 0.3 million shares of our common stock became vested pursuant to the terms of the retention plan, and we paid the first installment of the cash retention bonus in the amount of $1.5 million.
	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	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements
	Note 3. Fair Value Measurements
	The following tables present information about our financial assets measured at fair value on a recurring basis as of March 31, 2015 and December 31, 2014 based on the three-tier fair value hierarchy (in thousands):
		Fair Value Measurement at
		31-Mar-15
		Level 1		Level 2		Total
	Description
	Corporate securities	$	—	$	38,097	$	38,097
	Money market funds		20,491		—		20,491
	Commercial paper		—		7,991		7,991
	Asset-backed securities		—		5,069		5,069
	U.S. treasury securities		—		1,199		1,199
	Total	$	20,491	$	52,356	$	72,847
	Included in cash and cash equivalents					$	20,491
	Included in marketable securities					$	52,356
		Fair Value Measurement at
		31-Dec-14
		Level 1		Level 2		Total
	Description
	Corporate securities	$	—	$	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
	Gross unrealized gains or losses for cash equivalents and available-for-sale marketable securities as of March 31, 2015 and December 31, 2014 were not material. As of March 31, 2015 and December 31, 2014, there were no securities that were in an unrealized loss position for more than 12 months.
	The following table classifies our available-for-sale marketable securities by contractual maturities as of March 31, 2015 and December 31, 2014 (in thousands):
		March 31,		December 31,
		2015		2014
	Due in one year	$	44,855	$	42,204
	Due in one to five years		7,501		9,205
	Total	$	52,356	$	51,409
	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.
	There were no transfers between fair value measurement levels during the three months ended March 31, 2015.

Property_and_Equipment

Property and Equipment	3 Months Ended
	Mar. 31, 2015
Property Plant And Equipment [Abstract]
Property and Equipment	Note 4. Property and Equipment
	Property and equipment, net consists of the following (in thousands):
		March 31,			December 31,
		2015			2014
	Capitalized internal-use software	$	23,305		$	18,541
	Furniture and fixtures		4,619			4,524
	Hosting equipment		16,642			14,085
	Computer equipment and software		4,335			4,310
	Leasehold improvements		15,439			15,144
	Construction in progress		757			3,546
	Total		65,097			60,150
	Less: accumulated depreciation and amortization		(21,746	)		(18,255	)
	Property and equipment, net	$	43,351		$	41,895
	Depreciation expense was $2.3 million and $1.0 million for the three months ended March 31, 2015 and 2014, respectively.
	We capitalized $1.9 million and $1.8 million in internal-use software during the three months ended March 31, 2015 and 2014, respectively. Included in the capitalized development costs are $0.5 million and $49,000 in share-based compensation costs for the three months ended March 31, 2015 and 2014, respectively. Amortization expense of capitalized internal-use software totaled $1.5 million and $0.7 million for the three months ended March 31, 2015 and 2014, respectively. The carrying value of capitalized internal-use software at March 31, 2015 and December 31, 2014 was $14.0 million and $13.6 million, respectively, including $0.6 million and $3.5 million in construction in progress, respectively.

Goodwill_and_Purchased_Intangi

Goodwill and Purchased Intangible Assets	3 Months Ended
	Mar. 31, 2015
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Purchased Intangible Assets	Note 5. Goodwill and Purchased Intangible Assets
	The changes in the carrying amount of goodwill for the three months ended March 31, 2015 are as follows (in thousands):
	Balance as of December 31, 2014	$	9,240
	Foreign currency translation adjustments		(306	)
	Balance as of March 31, 2015	$	8,934
	Purchased intangible assets subject to amortization as of March 31, 2015 and December 31, 2014 consist of the following (in thousands).
		31-Mar-15
		Cost			Accumulated			Foreign Currency Translation Adjustment			Net		Remaining Useful Life
					Amortization
													(In years)
	Developed technology	$	5,200		$	(1,526	)	$	(253	)	$	3,421		2.5
	Customer relationships		1,300			(334	)		(66	)		900		3
	Trade name		60			(60	)		—			—		—
		$	6,560		$	(1,920	)	$	(319	)	$	4,321
		31-Dec-14
		Cost			Accumulated			Foreign Currency Translation Adjustment			Net		Remaining Useful Life
					Amortization
													(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 for the three months ended March 31, 2015 and 2014 was $0.4 million and $52,000, respectively.
	Estimated future amortization expense as of March 31, 2015 is as follows (in thousands):
	Remainder of 2015	$	1,271
	2016		1,686
	2017		1,298
	2018		66
		$	4,321

Credit_Facility

Credit Facility	3 Months Ended
	Mar. 31, 2015
Debt Disclosure [Abstract]
Credit Facility	Note 6. 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.  In June 2014 we repaid all outstanding principal and accrued interest under the revolving line of credit and as of March 31, 2015 there was no balance outstanding.  As of March 31, 2015 and December 31, 2014, the outstanding balance under the equipment line of credit was $6.2 million and $7.0 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 our 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 pursuant to 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 made interest-only payments prior to September 2014, when the outstanding balance became 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 March 31, 2015 and December 31, 2014, 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):
	Remainder of 2015	$	2,288
	2016		3,118
	2017		793
		$	6,199
	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	3 Months Ended
	Mar. 31, 2015
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 7. 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. Rent expense was $1.6 million and $1.8 million for the three months ended March 31, 2015 and 2014, respectively.
	We leased computer equipment from various parties under capital lease agreements that expired in March 2015.
	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 condensed 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 accrued for any significant liabilities in the accompanying consolidated financial statements as a result of these service-level agreements.

Common_Stock_and_Stockholders_

Common Stock and Stockholders' Equity (Deficit)	3 Months Ended
	Mar. 31, 2015
Equity [Abstract]
Common Stock and Stockholders' Equity (Deficit)	Note 8. Common Stock and Stockholders’ Equity
	Common Stock Authorized
	Upon the completion of our IPO, we increased the amount of common stock authorized for issuance from 125 million to 400 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. 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 three months ended March 31, 2015, no shares of common stock were purchased under the ESPP. Pursuant to the terms of the ESPP, the number of shares reserved under the ESPP increased by 0.8 million shares on January 1, 2015.  As of March 31, 2015, 4.0 million shares of common stock were available for issuance under the ESPP.
	Stock Option and Grant Plans
	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 2014 Stock Option and Incentive Plan, or the 2014 Plan, serves as the successor to our 2009 Plan.  Pursuant to the terms of the 2014 Plan, the number of shares reserved for issuance under the 2014 Plan increased by 3.8 million shares on January 1, 2015.  As of March 31, 2015, we had 8.1 million shares of common stock available for future grants under the 2014 Plan.
	The following table summarizes our stock option and RSU award activities for the three months ended March 31, 2015 (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, 2015		7,560			12,043		$	7.39		8.29	$	204,467		3,064		$	13.69
	Increase in authorized shares		3,779
	Stock options granted		(1,494	)		1,494			24.55
	RSUs granted		(1,854	)											1,854			24.77
	Stock options exercised					(982	)		2.99
	RSUs vested														(519	)		12.63
	Unvested shares repurchased
	Stock options forfeited or canceled		39			(39	)		4.52
	RSUs forfeited or cancelled		80												(80	)		15.18
	Outstanding —March 31, 2015		8,110			12,516		$	9.8		8.35	$	161,387		4,319		$	18.55
	Aggregate intrinsic value represents the difference between the Company's closing stock price of its common stock and the exercise price of outstanding, in-the-money options. The Company’s closing stock price as reported on the New York Stock Exchange as of March 31, 2015 was $22.69.
	As of March 31, 2015, we had a total of $129.8 million in future share-based compensation expense related to all equity awards, net of estimated forfeitures, to be recognized over a weighted average period of 3.4 years.
	Early Exercise of Stock Options and Purchase of Unvested Stock Awards
	Certain of our stock options permit early exercise. 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 March 31, 2015 and December 31, 2014, there were 0.5 million and 0.6 million shares, respectively, outstanding as a result of the 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 $1.8 million and $2.1 million, respectively.

Net_Loss_Per_Share

Net Loss Per Share	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Net Loss Per Share	Note 9. 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 considered all series of the redeemable convertible preferred stock to be participating securities as the holders of the preferred stock were 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 options 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 three months ended March 31, 2015 and 2014 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 warrants, 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):
		Three Months Ended
		March 31,
		2015			2014
	Net loss	$	(19,168	)	$	(10,259	)
	Less: Accretion of redeemable convertible preferred stock		—			(12	)
	Net loss attributable to common stockholders	$	(19,168	)	$	(10,271	)
	Basic shares:
	Weighted-average shares used to compute basic net loss per share		76,338			22,762
	Diluted shares:
	Weighted-average shares used to compute diluted net loss per share		76,338			22,762
	Net loss per share attributable to common stockholders:
	Basic and diluted	$	(0.25	)	$	(0.45	)
	The anti-dilutive securities excluded from the shares used to calculate the diluted net loss per share are as follows (in thousands):
		March 31,
		2015			2014
	Redeemable convertible preferred stock		—			34,323
	Shares subject to outstanding common stock options		12,516			14,665
	Shares subject to common stock warrants		—			125
	Restricted stock units		4,319			2,657
			16,835			51,770

Income_Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Note 10. Income Taxes
	The effective tax rates for the three months ended March 31, 2015 and 2014 were less than 1%.  The effective tax rate differs from the statutory rate primarily as a result of not recognizing a deferred tax asset for U.S. losses due to having a full valuation allowance against U.S. deferred tax assets.  There were no material changes to the unrecognized tax benefits in the three months ended March 31, 2015 and 2014.

Geographic_Information

Geographic Information	3 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
Geographic Information	Note 11. Geographic 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 reporting segment.
	Revenue
	The following table presents our revenue by geographic areas, as determined based on the billing address of our customers (in thousands):
		Three Months Ended
		March 31,
		2015		2014
	United States	$	22,852	$	14,885
	EMEA		12,576		6,620
	Other		6,806		3,587
	Total	$	42,234	$	25,092
	Long-Lived Assets
	The following table presents our long-lived assets by geographic areas (in thousands):
		31-Mar-15		31-Dec-14
	United States	$	24,236	$	22,817
	EMEA		4,075		4,373
	Other		1,053		1,095
	Total	$	29,364	$	28,286
	The carrying value of capitalized internal-use software and intangible assets is excluded from the balance of long-lived assets presented in the table above.

Overview_and_Basis_of_Presenta1

Overview and Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation
	These unaudited condensed consolidated financial statements have been prepared in accordance with United States generally accepted accounting principles, or GAAP, and applicable rules and regulations of the Securities and Exchange Commission, or SEC, regarding interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. Therefore, these condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes included in our Annual Report on Form 10-K for the year ended December 31, 2014, filed on February 17, 2015. There have been no changes to our significant accounting policies described in the Annual Report on Form 10-K that have had a material impact on our condensed consolidated financial statements and related notes.
	The consolidated balance sheet as of December 31, 2014 included herein was derived from the audited financial statements as of that date. The unaudited condensed consolidated financial statements reflect all normal recurring adjustments necessary to present fairly the financial position, results of operations, our comprehensive loss and cash flows for the interim periods, but are not necessarily indicative of the results of operations to be anticipated for the full year ending December 31, 2015.
Initial Public Offering and Share based Compensation	Initial Public Offering and Share-based Compensation
	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.
	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.  Compensation expense for awards with both service and performance conditions is recognized over the longer period required to achieve both conditions using the accelerated attribution 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. The remaining unrecognized share-based compensation expense related to the Performance Awards are being recorded over the remaining requisite service period using the accelerated attribution method, net of estimated forfeitures.
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 (through the date of our IPO) and share-based awards, fair value of acquired intangible assets, goodwill, unrecognized tax benefits, useful lives of 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.
Concentrations of Risk	Concentrations of Risk
	At March 31, 2015, there were no customers that represented more than 10% of our accounts receivable balance.  At March 31, 2014, one customer represented 14% and a second customer represented 12% of our total accounts receivable balance.  There were no customers that individually exceeded 10% of our revenue during the three months ended March 31, 2015 or 2014.
Recently Issued and Adopted Accounting Pronouncements	Recently Issued and Adopted Accounting Pronouncements
	On May 28, 2014, the FASB issued ASU 2014-09 regarding ASC Topic 606 “Revenue from Contracts with Customers.” This ASU provides principles for recognizing revenue to which an entity expects to be entitled for the transfer of promised goods or services to customers. This ASU is expected to be effective no earlier than 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_Tables

Acquisition (Tables)	3 Months Ended
	Mar. 31, 2015
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)	3 Months Ended
	Mar. 31, 2015
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 March 31, 2015 and December 31, 2014 based on the three-tier fair value hierarchy (in thousands):
		Fair Value Measurement at
		31-Mar-15
		Level 1		Level 2		Total
	Description
	Corporate securities	$	—	$	38,097	$	38,097
	Money market funds		20,491		—		20,491
	Commercial paper		—		7,991		7,991
	Asset-backed securities		—		5,069		5,069
	U.S. treasury securities		—		1,199		1,199
	Total	$	20,491	$	52,356	$	72,847
	Included in cash and cash equivalents					$	20,491
	Included in marketable securities					$	52,356
		Fair Value Measurement at
		31-Dec-14
		Level 1		Level 2		Total
	Description
	Corporate securities	$	—	$	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
Schedule of Available for Sale Marketable Securities Classified by Contractual Maturities	The following table classifies our available-for-sale marketable securities by contractual maturities as of March 31, 2015 and December 31, 2014 (in thousands):
		March 31,		December 31,
		2015		2014
	Due in one year	$	44,855	$	42,204
	Due in one to five years		7,501		9,205
	Total	$	52,356	$	51,409

Property_and_Equipment_Tables

Property and Equipment (Tables)	3 Months Ended
	Mar. 31, 2015
Property Plant And Equipment [Abstract]
Components of Property and Equipment	Property and equipment, net consists of the following (in thousands):
		March 31,			December 31,
		2015			2014
	Capitalized internal-use software	$	23,305		$	18,541
	Furniture and fixtures		4,619			4,524
	Hosting equipment		16,642			14,085
	Computer equipment and software		4,335			4,310
	Leasehold improvements		15,439			15,144
	Construction in progress		757			3,546
	Total		65,097			60,150
	Less: accumulated depreciation and amortization		(21,746	)		(18,255	)
	Property and equipment, net	$	43,351		$	41,895

Goodwill_and_Purchased_Intangi1

Goodwill and Purchased Intangibles Assets (Tables)	3 Months Ended
	Mar. 31, 2015
Goodwill And Intangible Assets Disclosure [Abstract]
Summary of Changes in Carrying Amount of Goodwill	The changes in the carrying amount of goodwill for the three months ended March 31, 2015 are as follows (in thousands):
	Balance as of December 31, 2014	$	9,240
	Foreign currency translation adjustments		(306	)
	Balance as of March 31, 2015	$	8,934
Summary of Intangible Assets Acquired
	Purchased intangible assets subject to amortization as of March 31, 2015 and December 31, 2014 consist of the following (in thousands).
		31-Mar-15
		Cost			Accumulated			Foreign Currency Translation Adjustment			Net		Remaining Useful Life
					Amortization
													(In years)
	Developed technology	$	5,200		$	(1,526	)	$	(253	)	$	3,421		2.5
	Customer relationships		1,300			(334	)		(66	)		900		3
	Trade name		60			(60	)		—			—		—
		$	6,560		$	(1,920	)	$	(319	)	$	4,321
		31-Dec-14
		Cost			Accumulated			Foreign Currency Translation Adjustment			Net		Remaining Useful Life
					Amortization
													(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 March 31, 2015 is as follows (in thousands):
	Remainder of 2015	$	1,271
	2016		1,686
	2017		1,298
	2018		66
		$	4,321

Credit_Facility_Tables

Credit Facility (Tables)	3 Months Ended
	Mar. 31, 2015
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):
	Remainder of 2015	$	2,288
	2016		3,118
	2017		793
		$	6,199

Common_Stock_and_Stockholders_1

Common Stock and Stockholders' Equity (Deficit) (Tables)	3 Months Ended
	Mar. 31, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Summary of Stock Option and RSU Award Activity	The following table summarizes our stock option and RSU award activities for the three months ended March 31, 2015 (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, 2015		7,560			12,043		$	7.39		8.29	$	204,467		3,064		$	13.69
	Increase in authorized shares		3,779
	Stock options granted		(1,494	)		1,494			24.55
	RSUs granted		(1,854	)											1,854			24.77
	Stock options exercised					(982	)		2.99
	RSUs vested														(519	)		12.63
	Unvested shares repurchased
	Stock options forfeited or canceled		39			(39	)		4.52
	RSUs forfeited or cancelled		80												(80	)		15.18
	Outstanding —March 31, 2015		8,110			12,516		$	9.8		8.35	$	161,387		4,319		$	18.55

Net_Loss_Per_Share_Tables

Net Loss Per Share (Tables)	3 Months Ended
	Mar. 31, 2015
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):
		Three Months Ended
		March 31,
		2015			2014
	Net loss	$	(19,168	)	$	(10,259	)
	Less: Accretion of redeemable convertible preferred stock		—			(12	)
	Net loss attributable to common stockholders	$	(19,168	)	$	(10,271	)
	Basic shares:
	Weighted-average shares used to compute basic net loss per share		76,338			22,762
	Diluted shares:
	Weighted-average shares used to compute diluted net loss per share		76,338			22,762
	Net loss per share attributable to common stockholders:
	Basic and diluted	$	(0.25	)	$	(0.45	)
Schedule of Anti-Dilutive Securities Excluded from the Diluted per Share Calculation	The anti-dilutive securities excluded from the shares used to calculate the diluted net loss per share are as follows (in thousands):
		March 31,
		2015			2014
	Redeemable convertible preferred stock		—			34,323
	Shares subject to outstanding common stock options		12,516			14,665
	Shares subject to common stock warrants		—			125
	Restricted stock units		4,319			2,657
			16,835			51,770

Geographic_Information_Tables

Geographic Information (Tables)	3 Months Ended
	Mar. 31, 2015
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):
		Three Months Ended
		March 31,
		2015		2014
	United States	$	22,852	$	14,885
	EMEA		12,576		6,620
	Other		6,806		3,587
	Total	$	42,234	$	25,092
Schedule of Long-Lived Assets by Geographic Areas	The following table presents our long-lived assets by geographic areas (in thousands):
		31-Mar-15		31-Dec-14
	United States	$	24,236	$	22,817
	EMEA		4,075		4,373
	Other		1,053		1,095
	Total	$	29,364	$	28,286

Overview_and_Basis_of_Presenta2

Overview and Basis of Presentation - Additional Information (Details) (USD $)	3 Months Ended	12 Months Ended	3 Months Ended	1 Months Ended
Share data in Millions, except Per Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	31-May-14
		Customer	Customer
Overview And Basis Of Presentation [Line Items]
Year founded	2007
Reincorporated date	2009-04
Share price	$22.69
Proceeds from follow-on public offering, net of issuance costs	$190,794,000
Customer Concentration Risk | Accounts Receivable
Overview And Basis Of Presentation [Line Items]
Number of customers	0	0
Customer Concentration Risk | Accounts Receivable | Maximum
Overview And Basis Of Presentation [Line Items]
Percentage of total revenue or receivables	10.00%	10.00%
Customer Concentration Risk | Accounts Receivable | Customer One
Overview And Basis Of Presentation [Line Items]
Percentage of total revenue or receivables			14.00%
Number of customers			1
Customer Concentration Risk | Accounts Receivable | Customer Two
Overview And Basis Of Presentation [Line Items]
Percentage of total revenue or receivables			12.00%
Number of customers			1
Customer Concentration Risk | Sales Revenue, Net
Overview And Basis Of Presentation [Line Items]
Number of customers	0		0
Customer Concentration Risk | Sales Revenue, Net | Maximum
Overview And Basis Of Presentation [Line Items]
Percentage of total revenue or receivables	10.00%		10.00%
Performance Awards
Overview And Basis Of Presentation [Line Items]
Service condition for performance awards	4 years
Share-based compensation expense	0
Follow On Public Offering
Overview And Basis Of Presentation [Line Items]
Shares of common stock sold in initial public offering	8.8
Share price	$22.75
Proceeds from follow-on public offering, net of issuance costs	190,794,000
Underwriting discounts and commission on IPO	8,700,000
Offering expenses	900,000
IPO
Overview And Basis Of Presentation [Line Items]
Shares of common stock sold in initial public offering				12.8
Share price				$9
Underwriting discounts and commission on IPO				8,100,000
Offering expenses				3,800,000
Proceeds from initial public offering, net of underwriting discounts and commissions and other offering expenses				$103,100,000
Number of shares of common stock issued upon automatic conversion of convertible preferred stock				34.3

Acquisition_Additional_Informa

Acquisition - Additional Information (Details) (Zopim, USD $)	0 Months Ended	3 Months Ended
In Millions, unless otherwise specified	Mar. 21, 2014	Mar. 31, 2015
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
Restricted cash related to business acquisition released during period		0.5
Released common stock consideration		1.2
RSUs issued pursuant to retention plan, in connection with the acquisition	0.9	0.3
Cash to be pay pursuant to retention plan, in connection with the acquisition	3	1.5
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

Acquisition_Schedule_of_Purcha

Acquisition - Schedule of Purchase Price Allocation for Acquisitions (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Business Acquisition [Line Items]
Goodwill	$8,934	$9,240
Zopim
Business Acquisition [Line Items]
Net tangible liabilities assumed		-385
Intangible assets		6,560
Goodwill		9,594
Total purchase price		$15,769

Fair_Value_Measurements_Financ

Fair Value Measurements - Financial Assets Measured at Fair Value on Recurring Basis (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of financial assets	$72,847	$72,791
Included in cash and cash equivalents	20,491	21,382
Included in marketable securities	52,356	51,409
Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of financial assets	20,491	21,382
Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of financial assets	52,356	51,409
Corporate securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of financial assets	38,097	40,345
Corporate securities | Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of financial assets	38,097	40,345
Money market funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of financial assets	20,491	21,382
Money market funds | Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of financial assets	20,491	21,382
Commercial paper
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of financial assets	7,991	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	7,991	3,993
Asset-backed Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of financial assets	5,069	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	5,069	5,080
U.S. treasury securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total fair value of financial assets	1,199	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	$1,199	$1,991

Fair_Value_Measurements_Additi

Fair Value Measurements - Additional Information (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Gross unrealized gains or losses for cash equivalent and available for sale marketable securities	$0	$0
Securities that were in an unrealized loss position for more than 12 months.	0	0
Transfer from fair value measurement level 1 to level 2	0
Transfer from fair value measurement level 2 to level 1	$0

Fair_Value_Measurements_Availa

Fair Value Measurements - Available for Sale Marketable Securities by Contractual Maturities (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Fair Value Disclosures [Abstract]
Due in one year	$44,855	$42,204
Due in one to five years	7,501	9,205
Total	$52,356	$51,409

Property_and_Equipment_Compone

Property and Equipment - Components of Property and Equipment (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Property Plant And Equipment [Line Items]
Property and equipment, gross	$65,097	$60,150
Less: accumulated depreciation and amortization	-21,746	-18,255
Property and equipment, net	43,351	41,895
Capitalized Internal-Use Software
Property Plant And Equipment [Line Items]
Property and equipment, gross	23,305	18,541
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property and equipment, gross	4,619	4,524
Hosting Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	16,642	14,085
Computer Equipment and Software
Property Plant And Equipment [Line Items]
Property and equipment, gross	4,335	4,310
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	15,439	15,144
Construction in Progress
Property Plant And Equipment [Line Items]
Property and equipment, gross	$757	$3,546

Property_and_Equipment_Additio

Property and Equipment - Additional Information (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Property Plant And Equipment [Abstract]
Depreciation expense	$2,300,000	$1,000,000
Capitalized internal-use software	1,900,000	1,800,000
Share-based compensation capitalized in internal-use software development costs	545,000	49,000
Amortization expense of capitalized internal-use software	1,500,000	700,000
Carrying value of capitalized internal-use software	14,000,000		13,600,000
Construction in progress	$600,000		$3,500,000

Goodwill_and_Purchased_Intangi2

Goodwill and Purchased Intangible Assets - Changes in Carrying Amount of Goodwill (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015
Goodwill And Intangible Assets Disclosure [Abstract]
Beginning balance	$9,240
Foreign currency translation adjustments	-306
Ending balance	$8,934

Goodwill_and_Purchased_Intangi3

Goodwill and Purchased Intangible Assets - Purchased Intangible Assets Subject to Amortization (Details) (USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Finite Lived Intangible Assets [Line Items]
Cost	$6,560	$6,560
Accumulated Amortization	-1,920	-1,407
Foreign Currency Translation Adjustment	-319	-241
Net	4,321	4,912
Developed Technology
Finite Lived Intangible Assets [Line Items]
Cost	5,200	5,200
Accumulated Amortization	-1,526	-1,118
Foreign Currency Translation Adjustment	-253	-191
Net	3,421	3,891
Remaining Useful Life	2 years 6 months	2 years 8 months 12 days
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Cost	1,300	1,300
Accumulated Amortization	-334	-244
Foreign Currency Translation Adjustment	-66	-48
Net	900	1,008
Remaining Useful Life	3 years	3 years 2 months 12 days
Trade Name
Finite Lived Intangible Assets [Line Items]
Cost	60	60
Accumulated Amortization	-60	-45
Foreign Currency Translation Adjustment		-2
Net		$13
Remaining Useful Life		2 months 12 days

Goodwill_and_Purchased_Intangi4

Goodwill and Purchased Intangible Assets - Additional Information (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization expense	$400,000	$52,000

Goodwill_and_Purchased_Intangi5

Goodwill and Purchased Intangible Assets - Estimated Future Amortization Expense (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Goodwill And Intangible Assets Disclosure [Abstract]
Remainder of 2015	$1,271
2016	1,686
2017	1,298
2018	66
Net	$4,321	$4,912

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]
Remainder of 2015	$2,288
2016	3,118
2017	793
Contractual future principal repayments, Total	$6,199

Credit_Facility_Additional_Inf

Credit Facility - Additional Information (Details) (USD $)	3 Months Ended
In Millions, except Share data, unless otherwise specified	Mar. 31, 2015	Jun. 30, 2012	Dec. 31, 2014
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
Line of credit outstanding amount	0
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
Line of credit outstanding amount	6.2		7
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 became payable in 30 equal monthly installments, with the last payment due on March 14, 2017.
Final payment on principal amount	0.3

Commitments_and_Contingencies_

Commitments and Contingencies - Additional Information (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Registration Payment Arrangement [Line Items]
Rent expense	$1.60	$1.80
Capital Lease Agreements
Registration Payment Arrangement [Line Items]
Lease expiration date	31-Mar-15

Common_Stock_and_Stockholders_2

Common Stock and Stockholders' Equity (Deficit) - Additional Information (Details) (USD $)	3 Months Ended	1 Months Ended
In Millions, except Share data, unless otherwise specified	Mar. 31, 2015	31-May-14	Dec. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, shares authorized	400,000,000	125,000,000	400,000,000
Common stock, par value	$0.01	0.01	$0.01
Share-based Compensation Arrangement by Share-based Payment Award Increase in Number of Shares Reserved and Available for Issuance	3,779,000
Share-based compensation, number of shares available for grant	8,110,000		7,560,000
Share price	$22.69
Future period share-based compensation expense	$129.80
Future period share-based compensation expense, period to recognized	3 years 4 months 24 days
Shares outstanding as a result of early exercise of stock options and purchase of unvested stock awards	500,000		600,000
Accrued liability for shares outstanding as a result of early exercise of stock options and purchase of unvested stock awards	$1.80		$2.10
Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award Increase in Number of Shares Reserved and Available for Issuance		800,000
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	0
Shares of common stock available for issuance	4,000,000
2014 Stock Option and Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award Increase in Number of Shares Reserved and Available for Issuance	3,800,000
Share-based compensation, number of shares available for grant	8,100,000

Common_Stock_and_Stockholders_3

Common Stock and Stockholders' Equity (Deficit) - Summary of Stock Option and RSU Award Activity (Details) (USD $)	3 Months Ended	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Shares Available for Grant
Balance at the beginning of the period	7,560
Increase in authorized shares	3,779
Stock options granted	-1,494
RSUs granted	-1,854
Stock options forfeited or canceled	39
RSUs forfeited or cancelled	80
Balance at the end of the period	8,110	7,560
Number of Shares
Balance at the beginning of the period	12,043
Stock options granted	1,494
Stock options exercised	-982
Stock options forfeited or canceled	-39
Balance at the end of the period	12,516	12,043
Weighted-Average Exercise Price
Balance at the beginning of the period	$7.39
Stock options granted	$24.55
Stock options exercised	$2.99
Stock options forfeited or canceled	$4.52
Balance at the end of the period	$9.80	$7.39
Weighted Average Remaining Contractual Term
Options Outstanding, Weighted-average remaining contractual term	8 years 4 months 6 days	8 years 3 months 15 days
Aggregate Intrinsic Value
Options Outstanding, Aggregate Intrinsic Value, Balance at beginning of period	$204,467
Options Outstanding, Aggregate Intrinsic Value, Balance at end of period	$161,387	$204,467
Outstanding RSUs
Balance at the beginning of the period	3,064
RSUs granted	1,854
RSUs vested	-519
RSUs forfeited or cancelled	-80
Balance at the end of the period	4,319	3,064
Weighted-Average Grant Date Fair Value
Balance at the beginning of the period	$13.69
RSUs granted	$24.77
RSUs vested	$12.63
RSUs forfeited or cancelled	$15.18
Balance at the end of the period	$18.55	$13.69

Net_Loss_per_Share_Computation

Net Loss per Share - Computation of Basic and Diluted Net Loss per Share of Common Stock (Details) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share [Abstract]
Net loss	($19,168)	($10,259)
Accretion of redeemable convertible preferred stock		-12
Net loss attributable to common stockholders	($19,168)	($10,271)
Basic shares:
Weighted-average shares used to compute basic net loss per share	76,338	22,762
Diluted shares:
Weighted-average shares used to compute diluted net loss per share	76,338	22,762
Net loss per share attributable to common stockholders:
Net loss per share attributable to common stockholders, basic and diluted	($0.25)	($0.45)

Net_Loss_per_Share_Schedule_of

Net Loss per Share - Schedule of Anti-Dilutive Securities Excluded from the Diluted per Share Calculation (Details)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share amount	16,835	51,770
Redeemable Convertible Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share amount		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 share amount	12,516	14,665
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 share amount		125
Restricted Stock Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share amount	4,319	2,657

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Details) (Maximum)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Maximum
Schedule Of Effective Tax Rates [Line Items]
Effective income tax rate, percent	1.00%	1.00%

Geographic_Information_Schedul

Geographic Information - Schedule of Revenue by Geographic Areas (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	$42,234	$25,092
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	22,852	14,885
EMEA
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	12,576	6,620
Other
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	$6,806	$3,587

Geographic_Information_Schedul1

Geographic Information - Schedule of Long-Lived Assets by Geographic Areas (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	$29,364	$28,286
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	24,236	22,817
EMEA
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	4,075	4,373
Other
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	$1,053	$1,095