ServiceNow (NOW) 10-Q 5 Nov 14 2014 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Oct. 31, 2014
Document and Entity Information [Abstract]	'	'
Entity Registrant Name	'SERVICENOW, INC.	'
Trading Symbol	'NOW	'
Entity Central Index Key	'0001373715	'
Document Type	'10-Q	'
Document Period End Date	30-Sep-14	'
Amendment Flag	'false	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q3	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Large Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	148.3

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$235,086	$366,303
Available-for-sale Securities, Current	410,986	268,251
Accounts receivable, net	111,164	108,339
Current portion of deferred commissions	36,376	31,123
Prepaid expenses and other current assets	27,787	23,733
Total current assets	821,399	797,749
Deferred commissions, less current portion	25,319	21,318
Long-term investments	238,051	255,356
Property and equipment, net	96,977	75,560
Intangible Assets, Net (Excluding Goodwill)	58,304	5,796
Goodwill	58,344	8,724
Other assets	6,218	3,973
Total assets	1,304,612	1,168,476
Current liabilities:	'	'
Accounts payable	11,416	7,405
Accrued expenses and other current liabilities	69,410	68,130
Current portion of deferred revenue	338,451	252,553
Total current liabilities	419,277	328,088
Deferred revenue, less current portion	12,344	14,169
Convertible senior notes, net	436,332	414,777
Other long-term liabilities	19,244	17,183
Total liabilities	887,197	774,217
Stockholders’ equity:	'	'
Common stock	148	140
Additional paid-in capital	737,509	573,791
Accumulated other comprehensive loss	-6,322	-476
Accumulated deficit	-313,920	-179,196
Total stockholders’ equity	417,415	394,259
Total liabilities and stockholders’ equity	$1,304,612	$1,168,476

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Comprehensive Loss (USD $)	3 Months Ended				9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Revenues:	'		'		'		'
Subscription	$150,367		$92,992		$400,466		$244,926
Professional services and other	28,345		18,267		84,093		54,494
Total revenues	178,712		111,259		484,559		299,420
Cost of revenues(1):	'		'		'		'
Subscription	37,925	[1]	23,429	[1]	102,357	[1]	61,960	[1]
Professional services and other	28,161	[1]	18,146	[1]	75,781	[1]	47,921	[1]
Total cost of revenues	66,086	[1]	41,575	[1]	178,138	[1]	109,881	[1]
Gross profit	112,626		69,684		306,421		189,539
Operating expenses(1):	'		'		'		'
Sales and marketing	84,002	[1]	47,336	[1]	245,355	[1]	137,853	[1]
Research and development	39,683	[1]	20,819	[1]	106,232	[1]	54,809	[1]
General and administrative	23,440	[1]	16,179	[1]	69,985	[1]	43,783	[1]
Total operating expenses	147,125	[1]	84,334	[1]	421,572	[1]	236,445	[1]
Loss from operations	-34,499		-14,650		-115,151		-46,906
Interest and other income (expense), net	-5,949		600		-17,143		-604
Loss before provision for income taxes	-40,448		-14,050		-132,294		-47,510
Provision for income taxes	602		663		2,430		1,966
Net loss	-41,050		-14,713		-134,724		-49,476
Earnings Per Share, Basic and Diluted	($0.28)		($0.11)		($0.93)		($0.37)
Net loss attributable to common stockholders - basic	-41,050		-14,713		-134,724		-49,476
Net loss attributable to common stockholders - diluted	-41,050		-14,713		-134,724		-49,476
Weighted-average shares used to compute net loss per share - basic and diluted	146,335,519		137,456,531		144,239,844		134,036,466
Other comprehensive income (loss):	'		'		'		'
Foreign currency translation adjustments	-6,710		758		-6,024		-608
Unrealized gain (loss) on investments	-212		412		178		-18
Other comprehensive income (loss), net of tax	-6,922		1,170		-5,846		-626
Comprehensive loss	($47,972)		($13,543)		($140,570)		($50,102)
[1]	Includes stock-based compensation as follows: Three Months Ended September 30, Nine Months Ended September 30, 2014 2013 2014 2013Cost of revenues: Subscription$3,995 $2,190 $10,896 $5,980Professional services and other3,572 1,209 9,188 3,095Sales and marketing14,956 5,945 36,382 14,752Research and development11,682 4,176 29,973 11,005General and administrative7,285 4,331 21,884 9,893

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Loss (Parenthetical) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Stock-based compensation	$41,490	$17,851	$108,323	$44,725
Subscription [Member]	'	'	'	'
Stock-based compensation	3,995	2,190	10,896	5,980
Professional services and other [Member]	'	'	'	'
Stock-based compensation	3,572	1,209	9,188	3,095
Sales and marketing [Member]	'	'	'	'
Stock-based compensation	14,956	5,945	36,382	14,752
Research and development [Member]	'	'	'	'
Stock-based compensation	11,682	4,176	29,973	11,005
General and administrative [Member]	'	'	'	'
Stock-based compensation	$7,285	$4,331	$21,884	$9,893

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Cash Flows (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities:	'	'
Net loss	($134,724)	($49,476)
Adjustments to reconcile net loss to net cash provided by operating activities:	'	'
Depreciation and amortization	28,734	16,316
Accretion (Amortization) of Discounts and Premiums, Investments	6,044	3,441
Amortization of deferred commissions	36,398	19,825
Amortization of debt discount and issuance cost	21,608	0
Stock-based compensation	108,323	44,725
Tax benefit from exercise of stock options	-1,190	-1,817
Other Operating Activities, Cash Flow Statement	-1,973	1,236
Changes in operating assets and liabilities:	'	'
Accounts receivable	-6,935	-6,988
Deferred commissions	-47,115	-34,894
Prepaid expenses and other assets	-2,386	1,077
Accounts payable	3,892	-408
Accrued expenses and other liabilities	92,351	54,332
Deferred revenue	-11,751	-1,890
Net cash provided by operating activities	91,276	45,479
Cash flows from investing activities:	'	'
Purchases of property and equipment	-45,499	-39,059
Payments to Acquire Businesses, Net of Cash Acquired	99,813	13,330
Purchases of investments	-360,783	-233,444
Sale of investments	97,807	50,403
Maturities of investments	134,618	142,456
Restricted cash	-55	-174
Net cash used in investing activities	-273,725	-93,148
Cash flows from financing activities:	'	'
Offering costs in connection with follow-on offering	0	-698
Proceeds from Issuance of Common Stock	53,904	47,833
Tax benefit from exercise of stock options	1,190	1,817
Net cash provided by financing activities	55,094	48,952
Foreign currency effect on cash and cash equivalents	-3,862	822
Net increase (decrease) in cash and cash equivalents	-131,217	2,105
Cash and cash equivalents at beginning of period	366,303	118,989
Cash and cash equivalents at end of period	235,086	121,094
Supplemental disclosures of non-cash investing activities:	'	'
Property and equipment included in accounts payable and accrued expenses	$6,220	$5,360

Description_of_Business

Description of Business	9 Months Ended
	Sep. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Description of Business	'
	Description of the Business
	ServiceNow is a leading provider of cloud-based services to automate and manage IT service relationships across the global enterprise. Our services include a suite of IT service automation applications built on our proprietary platform that can be rapidly deployed and configured. Customers use our services to create a single system of record for enterprise IT, automate manual tasks, standardize processes and consolidate legacy systems. Using ServiceNow, enterprise IT departments can accelerate their shift from the management of IT infrastructure to the management of IT service relationships across the enterprise with greater transparency, accountability and auditability. Our proprietary platform enables our customers to create custom applications and evolve the IT service model to service domains inside and outside the enterprise.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]	'
Summary of Significant Accounting Policies	'
	Summary of Significant Accounting Policies
	Basis of Presentation
	The accompanying unaudited condensed consolidated financial statements and condensed footnotes have been prepared in accordance with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring items) considered necessary for fair financial statement presentation have been included. The results of operations for the three and nine months ended September 30, 2014 are not necessarily indicative of the results to be expected for the year ended December 31, 2014 or for other interim periods or for future years. The condensed consolidated balance sheet as of December 31, 2013 is derived from audited financial statements as of that date, however, does not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements. These condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and related notes included in the Company’s Form 10-K for the year ended December 31, 2013, which was filed with the Securities and Exchange Commission on February 28, 2014.
	Principles of Consolidation
	The condensed consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles, or GAAP, and include our accounts and the accounts of our wholly-owned subsidiaries. All significant intercompany transactions and balances have been eliminated upon consolidation.
	Use of Estimates
	The preparation of consolidated financial statements in conformity with GAAP requires management to make certain estimates and assumptions. These estimates and assumptions affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements, as well as reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
	Concentration of Credit Risk and Significant Customers
	Financial instruments potentially exposing us to credit risk consist primarily of cash equivalents, investments and accounts receivable. We maintain cash, cash equivalents and investments at financial institutions that management believes to have good credit ratings and represent minimal risk of loss of principal. We invest in securities issued by financial-sector firms with a minimum rating of A by Standard & Poor's and A2 by Moody's and securities issued by non-financial sector firms with a minimum rating of BBB by Standard & Poor's and Baa1 by Moody's.
	Credit risk arising from accounts receivable is mitigated due to our large number of customers and their dispersion across various industries and geographies. As of September 30, 2014 and December 31, 2013, there were no customers that represented more than 10% of our accounts receivable balance. During the three and nine months ended September 30, 2014 and 2013, there were no customers that individually exceeded 10% of our total revenues.
	We review the composition of the accounts receivable balance, historical write-off experience and the potential risk of loss associated with delinquent accounts to determine if an allowance for doubtful accounts is necessary. Individual accounts receivable are written off when we become aware of a specific customer’s inability to meet its financial obligation and all collection efforts are exhausted. As of September 30, 2014 and December 31, 2013, the allowance for doubtful accounts was $1.0 million and $1.1 million, respectively.
	Warranties and Indemnification
	Our cloud-based service to automate enterprise IT operations is typically warranted to perform in material conformance with specifications.
	We include service level commitments to our customers that permit those customers to receive credits in the event we fail to meet those levels. We establish an accrual based on historical credits paid and an evaluation of the performance of our services, including an assessment of the impact of any known service disruptions. Service level credit accrual charges are recorded against revenue. As of September 30, 2014 and December 31, 2013, the service level credit accrual was $1.1 million and $0.6 million, respectively.
	We have also agreed to indemnify our directors and executive officers for costs associated with any fees, expenses, judgments, fines and settlement amounts incurred by any of these persons in any action or proceeding to which any of those persons is, or is threatened to be, made a party by reason of the person’s service as a director or officer, including any action by us, arising out of that person’s services as a director or officer of our company or that person’s services provided to any other company or enterprise at our request. We maintain director and officer insurance coverage that may enable us to recover a portion of any future amounts paid.
	Our contractual arrangements include provisions defending customers against intellectual property and other third-party claims. We have not incurred any costs as a result of such indemnification obligations and have not recorded any liabilities related to such obligations in the condensed consolidated financial statements.
	Recent Accounting Pronouncements
	In May 2014, the Financial Accounting Standards Board, or FASB, issued an update to ASC 606 Revenue from Contracts with Customers, or ASC 606, that will supersede virtually all existing revenue guidance. Under this update, an entity is required to recognize revenue upon transfer of promised goods or services to customers, in an amount that reflects the expected consideration received in exchange for those goods or services. As such, an entity will need to use more judgment and make more estimates than under the current guidance. This update should be applied retrospectively either to each prior reporting period presented in the financial statements, or only to the most current reporting period presented in the financial statements with a cumulative effect adjustment recorded in the retained earnings. This guidance will become effective for us for our interim and annual reporting periods beginning January 1, 2017. We are currently evaluating the impact of this update on our consolidated financial statements.
	In August 2014, the FASB issued new guidance related to the disclosures around going concern. The new standard provides guidance around management's responsibility to evaluate whether there is substantial doubt about an entity's ability to continue as a going concern and to provide related footnote disclosures. The new standard is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2016, with early adoption permitted. The adoption of this standard is not expected to have a material impact on our financial statements.

Investments

Investments	9 Months Ended
	Sep. 30, 2014
Available-for-sale Securities [Abstract]	'
Investments	'
	Investments
	The following is a summary of our investments (in thousands):
		30-Sep-14
		Amortized		Gross			Gross			Estimated
		Cost		Unrealized			Unrealized			Fair Value
				Gains			Losses
	Available-for-sale securities:
	Commercial paper	$	20,487	$	2		$	(1	)	$	20,488
	Corporate notes and bonds	548,448		220			(298		)	548,370
	Certificates of deposit	20,102		3			(6		)	20,099
	U.S. government agency securities	60,064		20			(4		)	60,080
	Total available-for-sale securities	$	649,101	$	245		$	(309	)	$	649,037
		31-Dec-13
		Amortized		Gross			Gross			Estimated
		Cost		Unrealized			Unrealized			Fair Value
				Gains			Losses
	Available-for-sale securities:
	Commercial paper	$	124,330	$	10		$	(21	)	$	124,319
	Corporate notes and bonds	399,519		129			(360		)	399,288
	Total available-for-sale securities	$	523,849	$	139		$	(381	)	$	523,607
	As of September 30, 2014, the contractual maturities of our investments did not exceed 24 months. The fair values of available-for-sale investments, by contractual maturity, are as follows (in thousands):
		30-Sep-14
	Due in 1 year or less	$	410,986
	Due in 1 year through 2 years	238,051
	Total	$	649,037
	We had certain available-for-sale securities in a gross unrealized loss position, all of which had been in such position for less than 12 months. There were no impairments considered "other-than-temporary" as it is more likely than not we will hold the securities until maturity or a recovery of the cost basis. The following table shows the fair values and the gross unrealized losses of these available-for-sale securities aggregated by investment types (in thousands):
		30-Sep-14					31-Dec-13
		Fair Value		Gross			Fair Value			Gross
				Unrealized						Unrealized
				Losses						Losses
	Commercial paper	$	5,992	$	(1	)	$	81,467		$	(21	)
	Corporate notes and bonds	265,948		(298		)	293,642			(360		)
	Certificates of deposit	9,195		(6		)	—			—
	U.S. government agency securities	20,028		(4		)	—			—
	Total	$	301,163	$	(309	)	$	375,109		$	(381	)

Fair_Value_Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2014
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]	'
Fair Value Measurements	'
	Fair Value Measurements
	The following table presents our fair value hierarchy for our assets and liabilities measured at fair value on a recurring basis at September 30, 2014 (in thousands):
		Level 1		Level 2		Total
	Cash and cash equivalents:
	Cash	$	110,110	$	—	$	110,110
	Money market funds	81,141		—		81,141
	Commercial paper	—		43,835		43,835
	Short-term investments:
	Commercial paper	—		20,488		20,488
	Corporate notes and bonds	—		359,875		359,875
	Certificates of deposit	—		16,604		16,604
	U.S. government agency securities	—		14,019		14,019
	Long-term investments:
	Corporate notes and bonds	—		188,495		188,495
	Certificates of deposit	—		3,495		3,495
	U.S. government agency securities	—		46,061		46,061
	Total	$	191,251	$	692,872	$	884,123
	The following table presents our fair value hierarchy for our assets and liabilities measured at fair value on a recurring basis at December 31, 2013 (in thousands):
		Level 1		Level 2		Total
	Cash and cash equivalents:
	Cash	$	69,333	$	—	$	69,333
	Money market funds	35,248		—		35,248
	Commercial paper	—		261,722		261,722
	Short-term investments:
	Commercial paper	—		124,319		124,319
	Corporate notes and bonds	—		143,932		143,932
	Long-term investments:
	Corporate notes and bonds	—		255,356		255,356
	Total	$	104,581	$	785,329	$	889,910
	We determine the fair value of our security holdings based on pricing from our service provider and market prices from industry-standard independent data providers. Such market prices may be quoted prices in active markets for identical assets (Level 1 inputs) or pricing determined using inputs other than quoted prices that are observable either directly or indirectly (Level 2 inputs), such as yield curve, volatility factors, credit spreads, default rates, loss severity, current market and contractual prices for the underlying instruments or debt, broker and dealer quotes, as well as other relevant economic measures.

Acquisition

Acquisition	9 Months Ended
	Sep. 30, 2014
Acquisition [Abstract]	'
Business Combination Disclosure [Text Block]	'
	Acquisition
	On July 11, 2014, we completed the acquisition of a privately-held company, Neebula Systems Ltd., or Neebula, by acquiring all issued and outstanding common shares of Neebula for approximately $100 million in an all-cash transaction. Neebula’s flagship product, ServiceWatch, automates the discovery, mapping and monitoring of IT-enabled enterprise services. The acquisition will expand the overall capabilities of our IT offerings. The following table summarizes the preliminary allocation of the purchase price to the fair value of the tangible and intangible assets acquired and liabilities assumed as of the acquisition date:
		Purchase Price Allocation			Useful Life
		(in thousands)			(in years)
	Net tangible asset acquired	$	102
	Intangible assets:
	Developed technology	56,200			5.5
	Order backlog	600			1.5
	Trade names	300			1.5
	Goodwill	53,958
	Deferred tax liabilities, net (1)	(10,697		)
	Total purchase price	$	100,463
	(1) Deferred tax liabilities, net primarily relates to purchased identifiable intangible assets and is shown net of deferred tax assets.
	The excess of purchase consideration over the fair value of net tangible and identifiable intangible assets acquired was recorded as goodwill. We believe the goodwill represents the synergies expected from expanded market opportunities when integrating Neebula technologies with our offerings. The goodwill balance is not deductible for U.S. income tax purposes. Acquisition-related costs of $1.2 million are primarily included in general and administrative expenses.
	The results of operations of Neebula have been included in our consolidated financial statements from the date of purchase. The following pro forma consolidated financial information combines the unaudited results of operations for us and Neebula for the three and nine months ended September 30, 2014 and 2013, as if the acquisition of Neebula had occurred on January 1, 2013 (in thousands, except share and per share data):
		Three Months Ended September 30,						Nine Months Ended September 30,
		2014			2013			2014			2013
	Revenue	$	178,736		$	111,512		$	485,422		$	299,855
	Net loss	(44,565		)	(18,368		)	(139,685		)	(61,721		)
	Weighted-average shares used to compute net loss per share attributable to common stockholders - basic and diluted	146,335,519			137,456,531			144,239,844			134,036,466
	Net loss per share attributable to common stockholders - basic and diluted	(0.30		)	(0.13		)	(0.97		)	(0.46		)
	The pro forma results as presented above are based on estimates and assumptions, which we believe are reasonable. They are not necessarily indicative of our consolidated results of operations in future periods or the results that actually would have been realized had we been a combined company during the periods presented. The pro forma results include adjustments primarily related to amortization of acquired intangible assets and acquisition-related costs.

Goodwill_and_Intangible_Assets

Goodwill and Intangible Assets	9 Months Ended
	Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Goodwill and Intangible Assets	'
	Goodwill and Intangible Assets
	Goodwill balances are presented below (in thousands):
		Carrying Amount
	Balance as of December 31, 2013	$	8,724
	Goodwill acquired	53,958
	Foreign currency translation adjustments	(4,338		)
	Balance as of September 30, 2014	$	58,344
	Intangible assets consist of the following (in thousands):
		September 30, 2014
		Gross Carrying Amount			Accumulated Amortization			Net Carrying Amount
	Developed technology	$	60,650		$	(3,962	)	$	56,688
	Backlog	593			(87		)	506
	Other acquisition-related intangible assets	614			(309		)	305
	Acquisition-related intangible assets	61,857			(4,358		)	57,499
	Other intangible assets	1,075			(270		)	805
	Total intangible assets	$	62,932		$	(4,628	)	$	58,304
		December 31, 2013
		Gross Carrying Amount			Accumulated Amortization			Net Carrying Amount
	Developed technology	$	5,783		$	(723	)	$	5,060
	Other acquisition-related intangible assets	348			(115		)	233
	Acquisition-related intangible assets	6,131			(838		)	5,293
	Other intangible assets	650			(147		)	503
	Total intangible assets	$	6,781		$	(985	)	$	5,796
	Amortization expense for intangible assets for the three months ended September 30, 2014 and 2013 was approximately $2.8 million and $0.4 million, respectively, and for the nine months ended September 30, 2014 and 2013 was approximately $3.7 million and $0.5 million, respectively.

Property_and_Equipment

Property and Equipment	9 Months Ended
	Sep. 30, 2014
Property, Plant and Equipment [Abstract]	'
Property and Equipment	'
	Property and Equipment
	Property and equipment, net consists of the following (in thousands):
		September 30,			December 31,
		2014			2013
	Computer equipment and software	$	122,398		$	90,617
	Furniture and fixtures	15,672			13,751
	Leasehold improvements	13,978			8,371
	Construction in progress	4,609			928
		156,657			113,667
	Less: Accumulated depreciation	(59,680		)	(38,107		)
	Total property and equipment, net	$	96,977		$	75,560
	Construction in progress consists primarily of in-process software development costs and leasehold improvements. Depreciation expense for the three months ended September 30, 2014 and 2013 was $9.3 million and $6.2 million, respectively, and for the nine months ended September 30, 2014 and 2013 was $25.0 million and $15.8 million, respectively.

Accrued_Expenses_and_Other_Cur

Accrued Expenses and Other Current Liabilities	9 Months Ended
	Sep. 30, 2014
Disclosure Summary Of Accrued Expenses And Other Current Liabilities [Abstract]	'
Accrued Expenses and Other Current Liabilities	'
	Accrued Expenses and Other Current Liabilities
	Accrued expenses and other current liabilities consist of the following (in thousands):
		September 30,		December 31,
		2014		2013
	Taxes payable	$	3,697	$	4,187
	Bonuses and commissions	23,517		22,322
	Accrued compensation	14,325		16,610
	Other employee expenses	10,543		11,926
	Other	17,328		13,085
	Total accrued expenses and other current liabilities	$	69,410	$	68,130

Convertible_Senior_Notes_Notes

Convertible Senior Notes (Notes)	9 Months Ended
	Sep. 30, 2014
Convertible Notes Payable [Abstract]	'
Notes Payable [Text Block]	'
	Convertible Senior Notes
	In November 2013, we issued 0% convertible senior notes due November 1, 2018 with aggregate principal amount of $575 million (the "Notes"). The Notes will not bear interest. The Notes mature on November 1, 2018 unless converted or repurchased in accordance with their terms prior to such date. We cannot redeem the Notes prior to maturity.
	The Notes are unsecured obligations and do not contain any financial covenants or restrictions on the payments of dividends, the incurrence of indebtedness or the issuance or repurchase of securities by us or any of our subsidiaries.
	Upon conversion, we may choose to pay or deliver, as the case may be, cash, shares of our common stock or a combination of cash and shares of our common stock. We intend to settle the principal amount of the Notes with cash.
	The Notes are convertible up to 7.8 million shares of our common stock at an initial conversion rate of approximately 13.54 shares of common stock per $1,000 principal amount, which is equal to an initial conversion price of approximately $73.88 per share of common stock, subject to adjustment. Holders of the Notes may convert their Notes at their option at any time prior to the close of business on the business day immediately preceding July 1, 2018, only under the following circumstances:
	•	during any calendar quarter commencing after the calendar quarter ending on March 31, 2014 (and only during such calendar quarter), if the last reported sale price of the common stock for at least 20 trading days (whether or not consecutive) during the period of 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day;
	•	during the five business day period after any five consecutive trading day period (the “measurement period”) in which the trading price per $1,000 principal amount of notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of our common stock and the conversion rate on each such trading day; or
	•	upon the occurrence of specified corporate events.
	On or after July 1, 2018, a holder may convert all or any portion of its notes at any time prior to the close of business on the second scheduled trading day immediately preceding the maturity date regardless of the foregoing conditions. Upon conversion, we will pay or deliver, as the case may be, cash, shares of our common stock or a combination of cash and shares of our common stock, at our election.
	The conversion price will be subject to adjustment in some events. Holders of the Notes who convert their notes in connection with certain corporate events that constitute a “make-whole fundamental change” are, under certain circumstances, entitled to an increase in the conversion rate. Additionally, in the event of a corporate event that constitutes a “fundamental change,” holders of the Notes may require us to purchase with cash all or a portion of the Notes upon the occurrence of a fundamental change, at a purchase price equal to 100% of the principal amount of the Notes plus any accrued and unpaid interest.
	In accounting for the issuance of the Notes, we separated the Notes into liability and equity components. The carrying cost of the liability component was calculated by measuring the fair value of a similar liability that does not have an associated convertible feature. The carrying amount of the equity component representing the conversion option was determined by deducting the fair value of the liability component from the par value of the Notes. The difference between the principal amount of the Notes and the proceeds allocated to the liability component (“debt discount”) is amortized to interest expense using the effective interest method over the term of the Note. The equity component is not remeasured as long as it continues to meet the conditions for equity classification.
	In accounting for the transaction costs related to the issuance of the Notes, we allocated the total amount incurred to the liability and equity components based on their relative fair values. Transaction costs attributable to the liability component are being amortized to interest expense over the term of the Notes, and transaction costs attributable to the equity component were netted with the equity component of the Notes in stockholders’ equity. The Notes consisted of the following (in thousands):
		30-Sep-14			31-Dec-13
	Liability:
	Principal	$	575,000		$	575,000
	Less: debt discount, net of amortization	(138,668		)	(160,223		)
	Net carrying amount	$	436,332		$	414,777
	We consider the fair value of the Notes at September 30, 2014 and December 31, 2013 to be a Level 2 measurement. The fair value of the Notes is primarily affected by the trading price of our common stock and interest rate. Based on the closing price of our common stock of $58.78 and $56.01 on September 30, 2014 and December 31, 2013, respectively, the if-converted value of the Notes was less than its principal amount.
	As of September 30, 2014, the remaining life of the Notes is 49 months. The following table sets forth total interest expense recognized related to the Notes (in thousands):
		Three months ended September 30, 2014			Nine months ended September 30, 2014
	Amortization of debt issuance cost	$	393		$	1,158
	Amortization of debt discount	6,932			20,450
	Total	$	7,325		$	21,608
	Effective interest rate of the liability component	6.50%
	No interest expense related to the Notes was recognized for the three and nine months ended September 30, 2013.
	Note Hedge
	To minimize the impact of potential economic dilution upon conversion of the Notes, we entered into convertible note hedge transactions (the "Note Hedge") with respect to our common stock concurrent with the issuance of the Notes. The Note Hedge covers approximately 7.8 million shares of our common stock at a strike price per share that corresponds to the initial conversion price of the Notes, subject to adjustment, and is exercisable upon conversion of the Notes. We paid an aggregate amount of $135.8 million for the Note Hedge. The Note Hedge will expire upon maturity of the Notes. The Note Hedge is intended to reduce the potential economic dilution upon conversion of the Notes in the event that the fair value per share of our common stock at the time of exercise is greater than the conversion price of the Notes. The Note Hedge is a separate transaction and is not part of the terms of the Notes. The Note Hedge does not impact earnings per share, as it was entered into to offset any dilution from the Notes.
	Warrants
	Separately, we entered into warrant transactions (the “Warrants”) whereby we sold warrants to acquire up to 7.8 million shares of our common stock, at a strike price of $107.46 per share, subject to adjustment. We received aggregate proceeds of $84.5 million from the sale of the Warrants. If the average market value per share of our common stock for the reporting period, as measured under the Warrants, exceeds the strike price of the Warrants, the Warrants will have a dilutive effect on our earnings per share. The Warrants are separate transactions and are not remeasured through earnings each reporting period. The Warrants are not part of the Notes or the Note Hedge, and have been accounted for as part of additional paid-in capital.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Loss	9 Months Ended
	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]	'
Accumulated Other Comprehensive Loss	'
	Accumulated Other Comprehensive Loss
	The components of accumulated other comprehensive loss, net of tax, consist of the following (in thousands):
		September 30,			December 31,
		2014			2013
	Foreign currency translation adjustment	$	(6,258	)	$	(234	)
	Net unrealized loss on investments	(64		)	(242		)
	Accumulated other comprehensive loss, net of tax	$	(6,322	)	$	(476	)
	Reclassification adjustments out of accumulated other comprehensive loss into net loss were immaterial for all periods presented.

Stockholders_Equity

Stockholders' Equity	9 Months Ended
	Sep. 30, 2014
Disclosure Common Stock Outstanding And Reserved Shares Of Common Stock For Future Issuance [Abstract]	'
Common Stock	'
	Stockholders' Equity
	We were authorized to issue 600,000,000 shares of common stock as of September 30, 2014. Holders of our common stock are not entitled to receive dividends unless declared by our board of directors. As of September 30, 2014, we had 147,433,125 shares of common stock outstanding and had reserved shares of common stock for future issuance as follows:
		30-Sep-14
	Stock option plans:
	Options outstanding	17,824,088
	RSUs	9,410,497
	Stock awards available for future grants:
	2005 Stock Option Plan(1)	—
	2012 Equity Incentive Plan(1)	15,124,772
	2012 Employee Stock Purchase Plan(1)	6,529,516
	Total reserved shares of common stock for future issuance	48,888,873
	-1	Refer to Note 12 for a description of these plans.
	During the nine months ended September 30, 2014 and 2013, we issued a total of 7,078,520 shares and 12,369,068 shares, respectively, from stock option exercises, vesting of restricted stock units, or RSUs, and purchases from the employee stock purchase plan, or ESPP.

Stock_Awards

Stock Awards	9 Months Ended
	Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Stock Awards	'
	Stock Awards
	We have a 2005 Stock Option Plan, or 2005 Plan, which provides for grants of stock awards, including options to purchase shares of common stock, stock purchase rights and RSUs to certain employees, officers, directors and consultants.
	Our 2012 Equity Incentive Plan, or 2012 Plan, provides for the grant of incentive stock options, nonqualified stock options, stock appreciation rights, RSUs, performance-based stock awards and other forms of equity compensation, or collectively, stock awards. In addition, the 2012 Plan provides for the grant of performance cash awards. Incentive stock options may be granted only to employees. All other awards may be granted to employees, including officers, as well as directors and consultants. The share reserve may increase to the extent outstanding stock options under the 2005 Plan expire or terminate unexercised. The share reserve also automatically increases on January 1 of each year until January 1, 2022, by up to 5% of the total number of shares of common stock outstanding on December 31 of the preceding year as determined by the board of directors. On January 1, 2014, 7,017,730 shares of common stock were automatically added to the 2012 Plan pursuant to the provision described in the preceding sentence.
	Our 2012 Employee Stock Purchase Plan, or 2012 ESPP, authorizes the issuance of shares of common stock pursuant to purchase rights granted to our employees. The number of shares of common stock reserved for issuance automatically increases on January 1 of each year until January 1, 2022, by up to 1% of the total number of shares of common stock outstanding on December 31 of the preceding year as determined by the board of directors. The price at which common stock is purchased under the 2012 ESPP is equal to 85% of the fair market value of the common stock on the first or last day of the offering period, whichever is lower. Offering periods are six months long and begin on February 1 and August 1 of each year. On January 1, 2014, 1,403,546 shares of common stock were automatically added to the 2012 ESPP pursuant to the provision described in the preceding sentence.
	Stock Options
	A summary of the stock option activity for the nine months ended September 30, 2014 is as follows:
		Number of		Weighted-		Weighted-		Aggregate
		Shares		Average		Average		Intrinsic Value
				Exercise		Remaining		(in thousands)
				Price		Contractual
						Term (Years)
	Outstanding at December 31, 2013	23,399,374		$	9.07
	Granted	657,144		60.73
	Exercised	(5,616,272	)	6.34				$	301,371
	Canceled	(616,158	)	20.06
	Outstanding at September 30, 2014	17,824,088		$	11.44	7.08		$	845,641
	Vested and expected to vest as of September 30, 2014	17,577,162		$	11.18	7.06		$	836,644
	Vested and exercisable as of September 30, 2014	9,597,716		$	6.43	6.65		$	502,480
	Aggregate intrinsic value represents the difference between the estimated fair value of our common stock and the exercise price of outstanding, in-the-money options. The weighted-average grant date fair value per share of options granted was $29.36 for the nine months ended September 30, 2014. The total fair value of shares vested was $30.0 million for the nine months ended September 30, 2014.
	As of September 30, 2014, total unrecognized compensation cost, adjusted for estimated forfeitures, related to unvested stock options was approximately $61.9 million. The weighted-average remaining vesting period of unvested stock options at September 30, 2014 was 2.45 years.
	RSUs
	A summary of RSU activity for the nine months ended September 30, 2014 is as follows:
		Number of		Weighted Average Grant Date Fair Value		Aggregate
		Shares		(Per Share)		Fair Value
						(in thousands)
	Outstanding at December 31, 2013	5,427,509		$	34.02
	Granted	5,569,859		61.03
	Vested	(1,046,742	)	28.59		$	58,932
	Forfeited	(540,129	)	44.16
	Non-vested and outstanding at September 30, 2014	9,410,497		$	50.03	$	553,149
	Expected to vest as of September 30, 2014	8,928,425				$	524,813
	RSUs granted under the 2005 Plan and the 2012 Plan to employees generally vest annually over a four-year period. As of September 30, 2014, total unrecognized compensation cost, adjusted for estimated forfeitures, related to unvested RSUs was approximately $376.7 million and the weighted-average remaining vesting period was 3.26 years.
	In the nine months ended September 30, 2014, we issued restricted stock units with both service and performance-based vesting criteria to certain executives. These restricted stock units will be eligible to vest based on our attainment of the 2014 financial performance goal as well as each executive's continued employment through the vesting date. In order to earn the restricted stock units, the low end of the predetermined goal must be met. The number of restricted stock units to be earned will range from 0% to 200% of the target awards based on the actual level of achievement of the financial performance goal. Shares earned will vest in four quarterly increments from February 2016 contingent on the continuous employment of each executive. We recognize stock-based compensation expense associated with these awards on a graded vesting basis over the vesting period, after assessing the probability of achieving the 2014 financial performance goal. As of September 30, 2014, we estimated 129% of the target awards will be earned. As actual results are achieved, the probability assessment is updated and stock-based compensation expense is adjusted accordingly.

Net_Income_Loss_Per_Share_Attr

Net Income (Loss) Per Share Attributable to Common Stockholders	9 Months Ended
	Sep. 30, 2014
Earnings Per Share [Abstract]	'
Net Income (Loss) Per Share Attributable to Common Stockholders	'
	Net Loss Per Share
	The following table presents the calculation of basic and diluted net loss per share (in thousands, except share and per share data):
		Three Months Ended September 30,							Nine Months Ended September 30,
		2014				2013			2014			2013
	Numerator:
	Net loss	$	(41,050	)		$	(14,713	)	$	(134,724	)	$	(49,476	)
	Denominator:
	Weighted-average shares outstanding—basic and diluted	146,335,519				137,456,531			144,239,844			134,036,466
	Net loss per share:
	Basic	$	(0.28	)		$	(0.11	)	$	(0.93	)	$	(0.37	)
	Diluted	$	(0.28	)		$	(0.11	)	$	(0.93	)	$	(0.37	)
	Potentially dilutive securities that are not included in the calculation of diluted net loss per share because doing so would be antidilutive are as follows:
		September 30,
		2014			2013
	Common stock options	17,824,088			25,453,497
	Restricted stock units	9,410,497			4,755,522
	Common stock subject to repurchase	29,712			118,963
	ESPP obligations	280,355			236,006
	Convertible senior notes	7,783,023			—
	Warrants related to the issuance of convertible senior notes	7,783,023			—
	Total potentially dilutive securities	43,110,698			30,563,988

Income_Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2014
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	Income Taxes
	We compute our provision for income taxes by applying the estimated annual effective tax rate to year-to-date loss from recurring operations and adjust the provision for discrete tax items recorded in the period.
	Our effective tax rate for the three and nine months ended September 30, 2014 was (1)% and (2)%, respectively, which was lower than the U.S. federal statutory tax rate of 34%. The lower tax rate was primarily attributable to our loss from operations, the foreign tax rate differential, and non-deductible expenses arising from stock-based compensation.
	Our effective tax rate for the three and nine months ended September 30, 2013 was (5)% and (4)%, which was lower than the federal statutory tax rate of 34%. The lower tax rate was primarily attributable to our loss from operations, the foreign tax rate differential, and non-deductible expenses arising from stock-based compensation, partially offset by state income taxes.
	We are subject to taxation in the United States and foreign jurisdictions.  As of September 30, 2014, our tax years 2005 to 2013 remain subject to examination in most jurisdictions. We are currently under examination by the Internal Revenue Service for the year ended June 30, 2011 and the six months ended December 31, 2011.
	There are differing interpretations of tax laws and regulations, and as a result, disputes may arise with tax authorities involving issues of the timing and amount of deductions and allocations of income among various tax jurisdictions. We periodically evaluate our exposures associated with our tax filing positions. We believe that adequate amounts have been reserved for any adjustments that may ultimately result from these examinations, and we do not anticipate a significant impact to our gross unrecognized tax benefits within the next 12 months related to these years. Although the timing of the resolution, settlement, and closure of any audit is highly uncertain, it is reasonably possible that the balance of gross unrecognized tax benefits could significantly change in the next 12 months. However, given the number of years that remain subject to examination, we are unable to estimate the full range of possible adjustments to the balance of gross unrecognized tax benefits.

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	Commitments and Contingencies
	Leases
	We lease facilities for data center capacity and office space under non-cancelable operating lease agreements with various expiration dates. There have been no material changes in our commitments under contractual obligations, as disclosed in our Annual Report on Form 10-K for the year ended December 31, 2013.
	Legal Proceedings
	From time to time, we are party to litigation and other legal proceedings in the ordinary course of business. While the results of any litigation or other legal proceedings are uncertain, management does not believe the ultimate resolution of any pending legal matters is likely to have a material adverse effect on our financial position, results of operations or cash flows, except as discussed below and for those matters for which we have recorded a loss contingency. We accrue for loss contingencies when it is both probable that we will incur the loss and when we can reasonably estimate the amount of the loss or range of loss.
	Generally, our subscription agreements require us to defend our customers for third-party intellectual property infringement and other claims. Any adverse determination related to intellectual property claims or other litigation could prevent us from offering our services and adversely affect our financial condition and results of operations.
	On February 6, 2014, Hewlett-Packard Company filed a lawsuit against us in the U.S. District Court for the Northern District of California that alleges that some of our services infringe the claims of eight of Hewlett-Packard's patents. Hewlett-Packard is seeking unspecified damages and an injunction. We filed an answer to the complaint on March 28, 2014 denying the allegations and asserting various affirmative defenses. The court held a first case management conference on June 26, 2014 and a second case management conference on September 4, 2014. The parties are currently conducting discovery. Hewlett-Packard served its infringement contentions on July 3, 2014. Hewlett-Packard's amended infringement contentions are due on November 18, 2014, and our invalidity contentions are due on January 9, 2015.
	On September 23, 2014, BMC Software, Inc. filed a lawsuit against us in the U.S. District Court for the Eastern District of Texas that alleges that some of our services willfully infringe the claims of seven of BMC’s patents. BMC is seeking unspecified damages and an injunction.
	We intend to vigorously defend these lawsuits. We cannot make a reasonable estimate of the potential loss or range of loss, if any, arising from these matters.

Information_about_Geographic_A

Information about Geographic Areas	9 Months Ended
	Sep. 30, 2014
Segments, Geographical Areas [Abstract]	'
Information about Geographic Areas	'
	Information about Geographic Areas
	Revenues by geographic area, based on the billing location of the customer, were as follows for the periods presented (in thousands):
		Three Months Ended September 30,				Nine Months Ended September 30,
		2014		2013		2014		2013
	Revenues by geography:
	North America (1)	$	120,435	$	76,851	$	329,660	$	208,851
	EMEA (2)	46,521		27,621		125,021		72,403
	Asia Pacific and other	11,756		6,787		29,878		18,166
	Total revenues	$	178,712	$	111,259	$	484,559	$	299,420
	Long-lived assets by geographic area were as follows (in thousands):
		September 30,		December 31,
		2014		2013
	Long-lived assets:
	North America	$	65,312	$	52,937
	EMEA(2)	19,887		18,017
	Asia Pacific and other	11,778		4,606
	Total long-lived assets	$	96,977	$	75,560
	(1) Revenues attributed to the United States were approximately 94% of North America revenues for the three months ended September 30, 2014 and 2013 and the nine months ended September 30, 2014 and 2013.
	(2) Europe, the Middle East and Africa

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]	'
Basis of Accounting, Policy [Policy Text Block]	'
	Basis of Presentation
	The accompanying unaudited condensed consolidated financial statements and condensed footnotes have been prepared in accordance with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring items) considered necessary for fair financial statement presentation have been included. The results of operations for the three and nine months ended September 30, 2014 are not necessarily indicative of the results to be expected for the year ended December 31, 2014 or for other interim periods or for future years. The condensed consolidated balance sheet as of December 31, 2013 is derived from audited financial statements as of that date, however, does not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements. These condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and related notes included in the Company’s Form 10-K for the year ended December 31, 2013, which was filed with the Securities and Exchange Commission on February 28, 2014.
Principles of Consolidation	'
	Principles of Consolidation
	The condensed consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles, or GAAP, and include our accounts and the accounts of our wholly-owned subsidiaries. All significant intercompany transactions and balances have been eliminated upon consolidation.
Use of Estimates	'
	Use of Estimates
	The preparation of consolidated financial statements in conformity with GAAP requires management to make certain estimates and assumptions. These estimates and assumptions affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements, as well as reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Concentration of Credit Risk and Significant Customers	'
	Concentration of Credit Risk and Significant Customers
	Financial instruments potentially exposing us to credit risk consist primarily of cash equivalents, investments and accounts receivable. We maintain cash, cash equivalents and investments at financial institutions that management believes to have good credit ratings and represent minimal risk of loss of principal. We invest in securities issued by financial-sector firms with a minimum rating of A by Standard & Poor's and A2 by Moody's and securities issued by non-financial sector firms with a minimum rating of BBB by Standard & Poor's and Baa1 by Moody's.
	Credit risk arising from accounts receivable is mitigated due to our large number of customers and their dispersion across various industries and geographies. As of September 30, 2014 and December 31, 2013, there were no customers that represented more than 10% of our accounts receivable balance. During the three and nine months ended September 30, 2014 and 2013, there were no customers that individually exceeded 10% of our total revenues.
	We review the composition of the accounts receivable balance, historical write-off experience and the potential risk of loss associated with delinquent accounts to determine if an allowance for doubtful accounts is necessary. Individual accounts receivable are written off when we become aware of a specific customer’s inability to meet its financial obligation and all collection efforts are exhausted. As of September 30, 2014 and December 31, 2013, the allowance for doubtful accounts was $1.0 million and $1.1 million, respectively.
Warranties and Indemnification	'
	Warranties and Indemnification
	Our cloud-based service to automate enterprise IT operations is typically warranted to perform in material conformance with specifications.
	We include service level commitments to our customers that permit those customers to receive credits in the event we fail to meet those levels. We establish an accrual based on historical credits paid and an evaluation of the performance of our services, including an assessment of the impact of any known service disruptions. Service level credit accrual charges are recorded against revenue. As of September 30, 2014 and December 31, 2013, the service level credit accrual was $1.1 million and $0.6 million, respectively.
	We have also agreed to indemnify our directors and executive officers for costs associated with any fees, expenses, judgments, fines and settlement amounts incurred by any of these persons in any action or proceeding to which any of those persons is, or is threatened to be, made a party by reason of the person’s service as a director or officer, including any action by us, arising out of that person’s services as a director or officer of our company or that person’s services provided to any other company or enterprise at our request. We maintain director and officer insurance coverage that may enable us to recover a portion of any future amounts paid.
	Our contractual arrangements include provisions defending customers against intellectual property and other third-party claims. We have not incurred any costs as a result of such indemnification obligations and have not recorded any liabilities related to such obligations in the condensed consolidated financial statements.
New Accounting Pronouncements, Policy [Policy Text Block]	'
	Recent Accounting Pronouncements
	In May 2014, the Financial Accounting Standards Board, or FASB, issued an update to ASC 606 Revenue from Contracts with Customers, or ASC 606, that will supersede virtually all existing revenue guidance. Under this update, an entity is required to recognize revenue upon transfer of promised goods or services to customers, in an amount that reflects the expected consideration received in exchange for those goods or services. As such, an entity will need to use more judgment and make more estimates than under the current guidance. This update should be applied retrospectively either to each prior reporting period presented in the financial statements, or only to the most current reporting period presented in the financial statements with a cumulative effect adjustment recorded in the retained earnings. This guidance will become effective for us for our interim and annual reporting periods beginning January 1, 2017. We are currently evaluating the impact of this update on our consolidated financial statements.
	In August 2014, the FASB issued new guidance related to the disclosures around going concern. The new standard provides guidance around management's responsibility to evaluate whether there is substantial doubt about an entity's ability to continue as a going concern and to provide related footnote disclosures. The new standard is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2016, with early adoption permitted. The adoption of this standard is not expected to have a material impact on our financial statements.

Investments_Tables

Investments (Tables)	9 Months Ended
	Sep. 30, 2014
Available-for-sale Securities [Abstract]	'
Summary of Investments	'
	The following is a summary of our investments (in thousands):
		30-Sep-14
		Amortized		Gross			Gross			Estimated
		Cost		Unrealized			Unrealized			Fair Value
				Gains			Losses
	Available-for-sale securities:
	Commercial paper	$	20,487	$	2		$	(1	)	$	20,488
	Corporate notes and bonds	548,448		220			(298		)	548,370
	Certificates of deposit	20,102		3			(6		)	20,099
	U.S. government agency securities	60,064		20			(4		)	60,080
	Total available-for-sale securities	$	649,101	$	245		$	(309	)	$	649,037
		31-Dec-13
		Amortized		Gross			Gross			Estimated
		Cost		Unrealized			Unrealized			Fair Value
				Gains			Losses
	Available-for-sale securities:
	Commercial paper	$	124,330	$	10		$	(21	)	$	124,319
	Corporate notes and bonds	399,519		129			(360		)	399,288
	Total available-for-sale securities	$	523,849	$	139		$	(381	)	$	523,607
Investments Classified by Contractual Maturity Date	'
	The fair values of available-for-sale investments, by contractual maturity, are as follows (in thousands):
		30-Sep-14
	Due in 1 year or less	$	410,986
	Due in 1 year through 2 years	238,051
	Total	$	649,037
Fair Values and Gross Unrealized Losses of Available-for-Sale Securities Aggregated by Investment Category	'
	The following table shows the fair values and the gross unrealized losses of these available-for-sale securities aggregated by investment types (in thousands):
		30-Sep-14					31-Dec-13
		Fair Value		Gross			Fair Value			Gross
				Unrealized						Unrealized
				Losses						Losses
	Commercial paper	$	5,992	$	(1	)	$	81,467		$	(21	)
	Corporate notes and bonds	265,948		(298		)	293,642			(360		)
	Certificates of deposit	9,195		(6		)	—			—
	U.S. government agency securities	20,028		(4		)	—			—
	Total	$	301,163	$	(309	)	$	375,109		$	(381	)

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2014
Fair Value, Assets, Liabilities and Stockholders' Equity Measured on Recurring Basis [Abstract]	'
Assets and Liabilities Measured at Fair Value on Recurring Basis	'
	The following table presents our fair value hierarchy for our assets and liabilities measured at fair value on a recurring basis at September 30, 2014 (in thousands):
		Level 1		Level 2		Total
	Cash and cash equivalents:
	Cash	$	110,110	$	—	$	110,110
	Money market funds	81,141		—		81,141
	Commercial paper	—		43,835		43,835
	Short-term investments:
	Commercial paper	—		20,488		20,488
	Corporate notes and bonds	—		359,875		359,875
	Certificates of deposit	—		16,604		16,604
	U.S. government agency securities	—		14,019		14,019
	Long-term investments:
	Corporate notes and bonds	—		188,495		188,495
	Certificates of deposit	—		3,495		3,495
	U.S. government agency securities	—		46,061		46,061
	Total	$	191,251	$	692,872	$	884,123
	The following table presents our fair value hierarchy for our assets and liabilities measured at fair value on a recurring basis at December 31, 2013 (in thousands):
		Level 1		Level 2		Total
	Cash and cash equivalents:
	Cash	$	69,333	$	—	$	69,333
	Money market funds	35,248		—		35,248
	Commercial paper	—		261,722		261,722
	Short-term investments:
	Commercial paper	—		124,319		124,319
	Corporate notes and bonds	—		143,932		143,932
	Long-term investments:
	Corporate notes and bonds	—		255,356		255,356
	Total	$	104,581	$	785,329	$	889,910

Acquisition_Tables

Acquisition (Tables)	9 Months Ended
	Sep. 30, 2014
Business Acquisition [Line Items]	'
Schedule of Business Acquisitions, by Acquisition [Table Text Block]	'
	The following table summarizes the preliminary allocation of the purchase price to the fair value of the tangible and intangible assets acquired and liabilities assumed as of the acquisition date:
		Purchase Price Allocation			Useful Life
		(in thousands)			(in years)
	Net tangible asset acquired	$	102
	Intangible assets:
	Developed technology	56,200			5.5
	Order backlog	600			1.5
	Trade names	300			1.5
	Goodwill	53,958
	Deferred tax liabilities, net (1)	(10,697		)
	Total purchase price	$	100,463
Business Acquisition, Pro Forma Information [Table Text Block]	'
	The following pro forma consolidated financial information combines the unaudited results of operations for us and Neebula for the three and nine months ended September 30, 2014 and 2013, as if the acquisition of Neebula had occurred on January 1, 2013 (in thousands, except share and per share data):
		Three Months Ended September 30,						Nine Months Ended September 30,
		2014			2013			2014			2013
	Revenue	$	178,736		$	111,512		$	485,422		$	299,855
	Net loss	(44,565		)	(18,368		)	(139,685		)	(61,721		)
	Weighted-average shares used to compute net loss per share attributable to common stockholders - basic and diluted	146,335,519			137,456,531			144,239,844			134,036,466
	Net loss per share attributable to common stockholders - basic and diluted	(0.30		)	(0.13		)	(0.97		)	(0.46		)

Goodwill_and_Intangible_Assets1

Goodwill and Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Schedule of Goodwill	'
	Goodwill balances are presented below (in thousands):
		Carrying Amount
	Balance as of December 31, 2013	$	8,724
	Goodwill acquired	53,958
	Foreign currency translation adjustments	(4,338		)
	Balance as of September 30, 2014	$	58,344
Schedule of Intangible Assets	'
	Intangible assets consist of the following (in thousands):
		September 30, 2014
		Gross Carrying Amount			Accumulated Amortization			Net Carrying Amount
	Developed technology	$	60,650		$	(3,962	)	$	56,688
	Backlog	593			(87		)	506
	Other acquisition-related intangible assets	614			(309		)	305
	Acquisition-related intangible assets	61,857			(4,358		)	57,499
	Other intangible assets	1,075			(270		)	805
	Total intangible assets	$	62,932		$	(4,628	)	$	58,304
		December 31, 2013
		Gross Carrying Amount			Accumulated Amortization			Net Carrying Amount
	Developed technology	$	5,783		$	(723	)	$	5,060
	Other acquisition-related intangible assets	348			(115		)	233
	Acquisition-related intangible assets	6,131			(838		)	5,293
	Other intangible assets	650			(147		)	503
	Total intangible assets	$	6,781		$	(985	)	$	5,796

Property_and_Equipment_Tables

Property and Equipment (Tables)	9 Months Ended
	Sep. 30, 2014
Property, Plant and Equipment [Abstract]	'
Summary of Property and Equipment, Net	'
	Property and equipment, net consists of the following (in thousands):
		September 30,			December 31,
		2014			2013
	Computer equipment and software	$	122,398		$	90,617
	Furniture and fixtures	15,672			13,751
	Leasehold improvements	13,978			8,371
	Construction in progress	4,609			928
		156,657			113,667
	Less: Accumulated depreciation	(59,680		)	(38,107		)
	Total property and equipment, net	$	96,977		$	75,560

Accrued_Expenses_and_Other_Cur1

Accrued Expenses and Other Current Liabilities (Tables)	9 Months Ended
	Sep. 30, 2014
Disclosure Summary Of Accrued Expenses And Other Current Liabilities [Abstract]	'
Summary of Accrued Expenses and Other Current Liabilities	'
	Accrued expenses and other current liabilities consist of the following (in thousands):
		September 30,		December 31,
		2014		2013
	Taxes payable	$	3,697	$	4,187
	Bonuses and commissions	23,517		22,322
	Accrued compensation	14,325		16,610
	Other employee expenses	10,543		11,926
	Other	17,328		13,085
	Total accrued expenses and other current liabilities	$	69,410	$	68,130

Convertible_Senior_Notes_Table

Convertible Senior Notes (Tables)	9 Months Ended
	Sep. 30, 2014
Convertible Notes Payable [Abstract]	'
Schedule of Convertible Notes	'
	The Notes consisted of the following (in thousands):
		30-Sep-14			31-Dec-13
	Liability:
	Principal	$	575,000		$	575,000
	Less: debt discount, net of amortization	(138,668		)	(160,223		)
	Net carrying amount	$	436,332		$	414,777
Interest Expense Recognized Related to the Notes	'
	The following table sets forth total interest expense recognized related to the Notes (in thousands):
		Three months ended September 30, 2014			Nine months ended September 30, 2014
	Amortization of debt issuance cost	$	393		$	1,158
	Amortization of debt discount	6,932			20,450
	Total	$	7,325		$	21,608
	Effective interest rate of the liability component	6.50%

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Loss (Tables)	9 Months Ended
	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]	'
Schedule of Accumulated Other Comprehensive Income (Loss)	'
	The components of accumulated other comprehensive loss, net of tax, consist of the following (in thousands):
		September 30,			December 31,
		2014			2013
	Foreign currency translation adjustment	$	(6,258	)	$	(234	)
	Net unrealized loss on investments	(64		)	(242		)
	Accumulated other comprehensive loss, net of tax	$	(6,322	)	$	(476	)

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2014
Disclosure Common Stock Outstanding And Reserved Shares Of Common Stock For Future Issuance [Abstract]	'
Common Stock Outstanding and Reserved Shares of Common Stock for Future Issuance	'
	As of September 30, 2014, we had 147,433,125 shares of common stock outstanding and had reserved shares of common stock for future issuance as follows:
		30-Sep-14
	Stock option plans:
	Options outstanding	17,824,088
	RSUs	9,410,497
	Stock awards available for future grants:
	2005 Stock Option Plan(1)	—
	2012 Equity Incentive Plan(1)	15,124,772
	2012 Employee Stock Purchase Plan(1)	6,529,516
	Total reserved shares of common stock for future issuance	48,888,873
	-1	Refer to Note 12 for a description of these plans.

Stock_Awards_Tables

Stock Awards (Tables)	9 Months Ended
	Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Schedule of Stock Option Activity	'
	A summary of the stock option activity for the nine months ended September 30, 2014 is as follows:
		Number of		Weighted-		Weighted-		Aggregate
		Shares		Average		Average		Intrinsic Value
				Exercise		Remaining		(in thousands)
				Price		Contractual
						Term (Years)
	Outstanding at December 31, 2013	23,399,374		$	9.07
	Granted	657,144		60.73
	Exercised	(5,616,272	)	6.34				$	301,371
	Canceled	(616,158	)	20.06
	Outstanding at September 30, 2014	17,824,088		$	11.44	7.08		$	845,641
	Vested and expected to vest as of September 30, 2014	17,577,162		$	11.18	7.06		$	836,644
	Vested and exercisable as of September 30, 2014	9,597,716		$	6.43	6.65		$	502,480
Schedule of Restricted Stock Unit Activity	'
	A summary of RSU activity for the nine months ended September 30, 2014 is as follows:
		Number of		Weighted Average Grant Date Fair Value		Aggregate
		Shares		(Per Share)		Fair Value
						(in thousands)
	Outstanding at December 31, 2013	5,427,509		$	34.02
	Granted	5,569,859		61.03
	Vested	(1,046,742	)	28.59		$	58,932
	Forfeited	(540,129	)	44.16
	Non-vested and outstanding at September 30, 2014	9,410,497		$	50.03	$	553,149
	Expected to vest as of September 30, 2014	8,928,425				$	524,813

Net_Income_Loss_Per_Share_Attr1

Net Income (Loss) Per Share Attributable to Common Stockholders (Tables)	9 Months Ended
	Sep. 30, 2014
Earnings Per Share [Abstract]	'
Calculation of Basic and Diluted Net Income (Loss) Per Share Attributable to Common Stockholders	'
	The following table presents the calculation of basic and diluted net loss per share (in thousands, except share and per share data):
		Three Months Ended September 30,							Nine Months Ended September 30,
		2014				2013			2014			2013
	Numerator:
	Net loss	$	(41,050	)		$	(14,713	)	$	(134,724	)	$	(49,476	)
	Denominator:
	Weighted-average shares outstanding—basic and diluted	146,335,519				137,456,531			144,239,844			134,036,466
	Net loss per share:
	Basic	$	(0.28	)		$	(0.11	)	$	(0.93	)	$	(0.37	)
	Diluted	$	(0.28	)		$	(0.11	)	$	(0.93	)	$	(0.37	)
Summary of Potentially Dilutive Securities	'
	Potentially dilutive securities that are not included in the calculation of diluted net loss per share because doing so would be antidilutive are as follows:
		September 30,
		2014			2013
	Common stock options	17,824,088			25,453,497
	Restricted stock units	9,410,497			4,755,522
	Common stock subject to repurchase	29,712			118,963
	ESPP obligations	280,355			236,006
	Convertible senior notes	7,783,023			—
	Warrants related to the issuance of convertible senior notes	7,783,023			—
	Total potentially dilutive securities	43,110,698			30,563,988

Information_about_Geographic_A1

Information about Geographic Areas (Tables)	9 Months Ended
	Sep. 30, 2014
Segments, Geographical Areas [Abstract]	'
Revenues by Geographic Area, Based on Billing Location of Customer	'
	Revenues by geographic area, based on the billing location of the customer, were as follows for the periods presented (in thousands):
		Three Months Ended September 30,				Nine Months Ended September 30,
		2014		2013		2014		2013
	Revenues by geography:
	North America (1)	$	120,435	$	76,851	$	329,660	$	208,851
	EMEA (2)	46,521		27,621		125,021		72,403
	Asia Pacific and other	11,756		6,787		29,878		18,166
	Total revenues	$	178,712	$	111,259	$	484,559	$	299,420
Schedule of Long Lived Assets by Geographic Area	'
	Long-lived assets by geographic area were as follows (in thousands):
		September 30,		December 31,
		2014		2013
	Long-lived assets:
	North America	$	65,312	$	52,937
	EMEA(2)	19,887		18,017
	Asia Pacific and other	11,778		4,606
	Total long-lived assets	$	96,977	$	75,560
	(1) Revenues attributed to the United States were approximately 94% of North America revenues for the three months ended September 30, 2014 and 2013 and the nine months ended September 30, 2014 and 2013.
	(2) Europe, the Middle East and Africa

Summary_of_Significant_Account2

Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
	Customer	Customer	Customer	Customer	Customer
Concentration Risk [Line Items]	'	'	'	'	'
Percent of accounts receivable considered significant, customers exceeded individually	10.00%	'	10.00%	'	'
Percentage of accounts receivable customers exceed	'	'	10.00%	'	'
Allowance for doubtful accounts	1	'	1	'	1.1
Valuation Allowances and Reserves, Balance	1.1	'	1.1	'	0.6
Customer Concentration Risk [Member]	'	'	'	'	'
Concentration Risk [Line Items]	'	'	'	'	'
Number Of Significant Revenue Customers	0	0	0	0	'
Number of customers represented more than ten percent of the accounts receivable balance	0	'	0	'	0

Investments_Summary_of_Investm

Investments - Summary of Investments (Detail) (USD $)	9 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	$649,101	$523,849
Available-for-sale Securities, Gross Unrealized Gain	245	139
Available-for-sale Securities, Gross Unrealized Loss	-309	-381
Available-for-sale Securities	649,037	523,607
Available For Sale Securities Maturities Term Maximum	'24 months	'
Available-for-sale Securities, Current	410,986	268,251
Long-term investments	238,051	255,356
Commercial Paper [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	20,487	124,330
Available-for-sale Securities, Gross Unrealized Gain	2	10
Available-for-sale Securities, Gross Unrealized Loss	-1	-21
Available-for-sale Securities	20,488	124,319
Corporate notes and bonds [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	548,448	399,519
Available-for-sale Securities, Gross Unrealized Gain	220	129
Available-for-sale Securities, Gross Unrealized Loss	-298	-360
Available-for-sale Securities	548,370	399,288
Certificates of Deposit [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	20,102	'
Available-for-sale Securities, Gross Unrealized Gain	3	'
Available-for-sale Securities, Gross Unrealized Loss	-6	'
Available-for-sale Securities	20,099	'
U.S. government agency securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	60,064	'
Available-for-sale Securities, Gross Unrealized Gain	20	'
Available-for-sale Securities, Gross Unrealized Loss	-4	'
Available-for-sale Securities	$60,080	'

Investments_Additional_Informa

Investments - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2014
Available-for-sale Securities [Abstract]	'
Available for sale, gross unrealized term held	'12 months
Other-than-temporary impairments considered	$0

Investments_Fair_Values_and_Gr

Investments - Fair Values and Gross Unrealized Losses of Available-for-Sale Securities Aggregated by Investment Category (Detail) (USD $)	9 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]	'	'
Fair Value	$301,163	$375,109
Gross Unrealized Losses	-309	-381
Commercial Paper [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Fair Value	5,992	81,467
Gross Unrealized Losses	-1	-21
Corporate notes and bonds [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Fair Value	265,948	293,642
Gross Unrealized Losses	-298	-360
Certificates of Deposit [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Fair Value	9,195	0
Gross Unrealized Losses	-6	0
US Government Agencies Debt Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Fair Value	20,028	0
Gross Unrealized Losses	($4)	$0

Fair_Value_Measurements_Assets

Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	$649,037	$523,607
Commercial Paper [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	20,488	124,319
Corporate notes and bonds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	548,370	399,288
Certificates of Deposit [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	20,099	'
US Government Agencies Debt Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	60,080	'
Level 1 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total	191,251	104,581
Level 2 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total	692,872	785,329
Total [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total	884,123	889,910
Cash [Member] | Level 1 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Cash and cash equivalents	110,110	69,333
Cash [Member] | Level 2 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Cash and cash equivalents	0	0
Cash [Member] | Total [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Cash and cash equivalents	110,110	69,333
Cash Equivalents [Member] | Level 1 [Member] | Money Market Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Cash and cash equivalents	81,141	35,248
Cash Equivalents [Member] | Level 1 [Member] | Commercial Paper [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Cash and cash equivalents	0	0
Cash Equivalents [Member] | Level 2 [Member] | Money Market Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Cash and cash equivalents	0	0
Cash Equivalents [Member] | Level 2 [Member] | Commercial Paper [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Cash and cash equivalents	43,835	261,722
Cash Equivalents [Member] | Total [Member] | Money Market Funds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Cash and cash equivalents	81,141	35,248
Cash Equivalents [Member] | Total [Member] | Commercial Paper [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Cash and cash equivalents	43,835	261,722
Short-term Investments [Member] | Level 1 [Member] | Commercial Paper [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	0	0
Short-term Investments [Member] | Level 1 [Member] | Corporate notes and bonds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	0	0
Short-term Investments [Member] | Level 1 [Member] | Certificates of Deposit [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	0	'
Short-term Investments [Member] | Level 1 [Member] | US Government Agencies Debt Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	0	'
Short-term Investments [Member] | Level 2 [Member] | Commercial Paper [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	20,488	124,319
Short-term Investments [Member] | Level 2 [Member] | Corporate notes and bonds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	359,875	143,932
Short-term Investments [Member] | Level 2 [Member] | Certificates of Deposit [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	16,604	'
Short-term Investments [Member] | Level 2 [Member] | US Government Agencies Debt Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	14,019	'
Short-term Investments [Member] | Total [Member] | Commercial Paper [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	20,488	124,319
Short-term Investments [Member] | Total [Member] | Corporate notes and bonds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	359,875	143,932
Short-term Investments [Member] | Total [Member] | Certificates of Deposit [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	16,604	'
Short-term Investments [Member] | Total [Member] | US Government Agencies Debt Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	14,019	'
Other Long-term Investments [Member] | Level 1 [Member] | Corporate notes and bonds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	0	0
Other Long-term Investments [Member] | Level 1 [Member] | Certificates of Deposit [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	0	'
Other Long-term Investments [Member] | Level 1 [Member] | US Government Agencies Debt Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	0	'
Other Long-term Investments [Member] | Level 2 [Member] | Corporate notes and bonds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	188,495	255,356
Other Long-term Investments [Member] | Level 2 [Member] | Certificates of Deposit [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	3,495	'
Other Long-term Investments [Member] | Level 2 [Member] | US Government Agencies Debt Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	46,061	'
Other Long-term Investments [Member] | Total [Member] | Corporate notes and bonds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	188,495	255,356
Other Long-term Investments [Member] | Total [Member] | Certificates of Deposit [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	3,495	'
Other Long-term Investments [Member] | Total [Member] | US Government Agencies Debt Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	$46,061	'

Acquisition_Details

Acquisition (Details) (USD $)	0 Months Ended		3 Months Ended		9 Months Ended
	Jul. 11, 2014		Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Jul. 11, 2014		Dec. 31, 2013
Business Acquisition [Line Items]	'		'	'	'	'	'		'
Business Acquisition, Pro Forma Revenue	'		$178,736,000	$111,512,000	$485,422,000	$299,855,000	'		'
Business Acquisition, Transaction Costs	'		'	'	'	'	1,200,000		'
Goodwill	'		58,344,000	'	58,344,000	'	'		8,724,000
Business Acquisition, Pro Forma Net Income (Loss)	'		-44,565,000	-18,368,000	-139,685,000	-61,721,000	'		'
Weighted-average shares used to compute net loss per share - basic and diluted	'		146,335,519	137,456,531	144,239,844	134,036,466	'		'
Business Acquisition, Pro Forma Earnings Per Share, Basic	'		($0.30)	($0.13)	($0.97)	($0.46)	'		'
Business Acquisition, Pro Forma Earnings Per Share, Basic	'		($0.30)	($0.13)	($0.97)	($0.46)	'		'
Payments to Acquire Businesses, Net of Cash Acquired	100,000,000		'	'	99,813,000	13,330,000	'		'
Neebula Systems Ltd. [Member]	'		'	'	'	'	'		'
Business Acquisition [Line Items]	'		'	'	'	'	'		'
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	102,000		'	'	'	'	102,000		'
Goodwill	53,958,000		'	'	'	'	53,958,000		'
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent	-10,697,000	[1]	'	'	'	'	-10,697,000	[1]	'
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	100,463,000		'	'	'	'	100,463,000		'
Developed Technology Rights [Member]	'		'	'	'	'	'		'
Business Acquisition [Line Items]	'		'	'	'	'	'		'
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	56,200,000		'	'	'	'	56,200,000		'
Developed Technology Rights [Member] | Neebula Systems Ltd. [Member]	'		'	'	'	'	'		'
Business Acquisition [Line Items]	'		'	'	'	'	'		'
Finite-Lived Intangible Asset, Useful Life	'5 years 6 months		'	'	'	'	'		'
Order or Production Backlog [Member]	'		'	'	'	'	'		'
Business Acquisition [Line Items]	'		'	'	'	'	'		'
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	600,000		'	'	'	'	600,000		'
Order or Production Backlog [Member] | Neebula Systems Ltd. [Member]	'		'	'	'	'	'		'
Business Acquisition [Line Items]	'		'	'	'	'	'		'
Finite-Lived Intangible Asset, Useful Life	'1 year 6 months		'	'	'	'	'		'
Trade Names [Member]	'		'	'	'	'	'		'
Business Acquisition [Line Items]	'		'	'	'	'	'		'
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	$300,000		'	'	'	'	$300,000		'
Trade Names [Member] | Neebula Systems Ltd. [Member]	'		'	'	'	'	'		'
Business Acquisition [Line Items]	'		'	'	'	'	'		'
Finite-Lived Intangible Asset, Useful Life	'1 year 6 months		'	'	'	'	'		'
[1]	Deferred tax liabilities, net primarily relates to purchased identifiable intangible assets and is shown net of deferred tax assets.

Goodwill_and_Intangible_Assets2

Goodwill and Intangible Assets - Schedule of Goodwill (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]	'
Goodwill, Acquired During Period	$53,958
Goodwill [Roll Forward]	'
Goodwill, beginning of period	8,724
Foreign currency translation adjustments	-4,338
Goodwill, end of period	$58,344

Goodwill_and_Intangible_Assets3

Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Acquired Finite-Lived Intangible Assets [Line Items]	'	'	'	'	'
Gross Carrying Amount	$62,932,000	'	$62,932,000	'	$6,781,000
Accumulated Amortization	-4,628,000	'	-4,628,000	'	-985,000
Intangible Assets, Net (Excluding Goodwill)	58,304,000	'	58,304,000	'	5,796,000
Amortization expense	2,800,000	400,000	3,700,000	500,000	'
Developed Technology Rights [Member]	'	'	'	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'	'	'	'
Gross Carrying Amount	60,650,000	'	60,650,000	'	5,783,000
Accumulated Amortization	-3,962,000	'	-3,962,000	'	-723,000
Intangible Assets, Net (Excluding Goodwill)	56,688,000	'	56,688,000	'	5,060,000
Order or Production Backlog [Member]	'	'	'	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'	'	'	'
Gross Carrying Amount	593,000	'	593,000	'	'
Accumulated Amortization	-87,000	'	-87,000	'	'
Intangible Assets, Net (Excluding Goodwill)	506,000	'	506,000	'	'
Other acquisition-related intangible assets [Member]	'	'	'	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'	'	'	'
Gross Carrying Amount	614,000	'	614,000	'	348,000
Accumulated Amortization	-309,000	'	-309,000	'	-115,000
Intangible Assets, Net (Excluding Goodwill)	305,000	'	305,000	'	233,000
Acquisition related intangible asset [Domain]	'	'	'	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'	'	'	'
Gross Carrying Amount	61,857,000	'	61,857,000	'	6,131,000
Accumulated Amortization	-4,358,000	'	-4,358,000	'	-838,000
Intangible Assets, Net (Excluding Goodwill)	57,499,000	'	57,499,000	'	5,293,000
Other Intangible Assets [Member]	'	'	'	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'	'	'	'
Gross Carrying Amount	1,075,000	'	1,075,000	'	650,000
Accumulated Amortization	-270,000	'	-270,000	'	-147,000
Intangible Assets, Net (Excluding Goodwill)	$805,000	'	$805,000	'	$503,000

Property_and_Equipment_Net_Det

Property and Equipment - Net (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, Gross	$156,657	$113,667
Less: accumulated depreciation	-59,680	-38,107
Total property and equipment, net	96,977	75,560
Computer Equipment And Software [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, Gross	122,398	90,617
Furniture and Fixtures [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, Gross	15,672	13,751
Leasehold Improvements [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, Gross	13,978	8,371
Construction in Progress [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, Gross	$4,609	$928

Property_and_Equipment_Additio

Property and Equipment - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Property, Plant and Equipment [Abstract]	'	'	'	'
Depreciation	$9,328,952	$6,154,174.76	$25,045,593	$15,804,511

Accrued_Expenses_and_Other_Cur2

Accrued Expenses and Other Current Liabilities - (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Disclosure Summary Of Accrued Expenses And Other Current Liabilities [Abstract]	'	'
Taxes Payable, Current	$3,697	$4,187
Bonuses and commissions	23,517	22,322
Accrued compensation	14,325	16,610
Other employee expenses	10,543	11,926
Other	17,328	13,085
Accrued expenses and other current liabilities	($69,410)	($68,130)

Convertible_Senior_Notes_Detai

Convertible Senior Notes (Details) (USD $)	3 Months Ended		9 Months Ended
Share data in Millions, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Nov. 06, 2013	Nov. 01, 2013
Debt Conversion [Line Items]	'	'	'	'	'	'	'
Notes face amount	'	'	$1,000	'	'	'	'
Contractual interest rate - Notes	'	'	'	'	'	0.00%	'
Notes Maturity Date	'	'	1-Nov-18	'	'	'	'
Notes, par value	575,000,000	'	575,000,000	'	575,000,000	'	575,000,000
Converted number of shares	'	'	7.8	'	'	'	'
Conversion rate	'	'	13.54	'	'	'	'
Initial conversion price, per share	'	'	'	'	'	$73.88	'
Terms of conversion feature	'	'	'July 1, 2018	'	'	'	'
Earliest date of conversion	'	'	31-Mar-14	'	'	'	'
Percentage of purchase price of Notes which should be paid upon fundamental change	'	'	100.00%	'	'	'	'
Price per share (USD)	$58.78	'	$58.78	'	$56.01	'	'
Remaining life of the Notes	'	'	'49 months	'	'	'	'
Amortization of debt discount and issuance cost	7,325,000	0	21,608,000	0	'	'	'
Noted Hedged shares of common stock covered	'	'	7.8	'	'	'	'
Purchase of convertible note hedge	'	'	135,800,000	'	'	'	'
Issuance of warrants (in shares)	7.8	'	7.8	'	'	'	'
Exercise price of warrants issued (USD per share)	'	'	'	'	'	$107.46	'
Proceeds from issuance of warrants	'	'	84,500,000	'	'	'	'
Calendar Quarter End [Member]	'	'	'	'	'	'	'
Debt Conversion [Line Items]	'	'	'	'	'	'	'
Number of days out of 30 that common stock price exceeded conversion price, days	'	'	'20 days	'	'	'	'
Number of consecutive trading days in a period	'	'	'30 days	'	'	'	'
Calendar Quarter End [Member] | Minimum [Member]	'	'	'	'	'	'	'
Debt Conversion [Line Items]	'	'	'	'	'	'	'
Threshold percentage of stock price trigger	'	'	130.00%	'	'	'	'
Measurement Period [Member]	'	'	'	'	'	'	'
Debt Conversion [Line Items]	'	'	'	'	'	'	'
Number of days out of 30 that common stock price exceeded conversion price, days	'	'	'5 days	'	'	'	'
Number of consecutive trading days in a period	'	'	'5 days	'	'	'	'
Notes face amount	'	'	$1,000	'	'	'	'
Measurement Period [Member] | Maximum [Member]	'	'	'	'	'	'	'
Debt Conversion [Line Items]	'	'	'	'	'	'	'
Threshold percentage of stock price trigger	'	'	98.00%	'	'	'	'

Convertible_Senior_Notes_Sched

Convertible Senior Notes - Schedule of Notes Payable (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Nov. 01, 2013
Convertible Notes Payable [Abstract]	'	'	'
Notes, par value	$575,000,000	$575,000,000	$575,000,000
Less: debt discount net of amortization	-138,668,000	-160,223,000	'
Convertible senior notes, net	$436,332,000	$414,777,000	'

Convertible_Senior_Notes_Sched1

Convertible Senior Notes - Schedule of Interest Expense Recognized (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Convertible Notes Payable [Abstract]	'	'	'	'
Amortization of debt issuance cost	$393	'	$1,158	'
Amortization of premiums on investments	6,932	'	20,450	'
Amortization of debt discount and issuance cost	$7,325	$0	$21,608	$0
Effective interest rate of the liability component	6.50%	'	6.50%	'

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Loss - (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Statement of Comprehensive Income [Abstract]	'	'
Foreign currency translation adjustment	($6,258)	($234)
Net unrealized loss on investments	-64	-242
Accumulated other comprehensive loss, net of tax	($6,322)	($476)

Stockholders_Equity_Additional

Stockholders' Equity - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Stockholders' Equity	'	'
Shares of common stock, authorized (shares)	600,000,000	'
Shares of common stock, issued and sold (shares)	147,433,125	'
Common Stock [Member]	'	'
Stockholders' Equity	'	'
Stock Issued During Period, Shares, New Issues	7,078,520	12,369,068

Stockholders_Equity_Outstandin

Stockholders' Equity - Outstanding and Reserved Shares of Common Stock for Future Issuance (Detail)	Sep. 30, 2014		Dec. 31, 2013
Common stock outstanding and reserved shares of common stock for future issuance	'		'
Options outstanding	17,824,088		23,399,374
Total reserved shares of common stock for future issuance	48,888,873		'
2005 Stock Option Plan [Member]	'		'
Common stock outstanding and reserved shares of common stock for future issuance	'		'
Total reserved shares of common stock for future issuance	0	[1]	'
2012 Equity Incentive Plan [Member]	'		'
Common stock outstanding and reserved shares of common stock for future issuance	'		'
Total reserved shares of common stock for future issuance	15,124,772	[1]	'
2012 Employee Stock Purchase Plan [Member]	'		'
Common stock outstanding and reserved shares of common stock for future issuance	'		'
Total reserved shares of common stock for future issuance	6,529,516	[1]	'
Stock Options [Member]	'		'
Common stock outstanding and reserved shares of common stock for future issuance	'		'
Options outstanding	17,824,088		'
Restricted Stock Units (RSUs) [Member]	'		'
Common stock outstanding and reserved shares of common stock for future issuance	'		'
RSUs	9,410,497		5,427,509
[1]	Refer to Note 12 for a description of these plans.

Stock_Awards_Additional_Inform

Stock Awards - Additional Information (Detail) (USD $)	9 Months Ended
In Millions, except Share data, unless otherwise specified	Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Shares of common stock, authorized (shares)	600,000,000
Shares of common stock reserved for issuance	48,888,873
Weighted-average grant date fair value of options granted (usd per share)	$29.36
Fair value of vested shares	$30
Total unrecognized compensation cost, adjusted for estimated forfeitures, related to unvested stock options	61.9
Weighted-average remaining vesting period for unvested stock options	'2 years 164 days
Minimum Percent of Target Award of Stock Plan	0.00%
Maximum Percent of Target Award of Stock Plan	200.00%
Estimated Percentage of Performance Goal Target Earned	129.00%
Restricted Stock Units (RSUs) [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Compensation expense recognized, vesting term	'4 years
Weighted-average remaining vesting period for unvested stock options	'3 years 95 days
Unrecognized compensation expense expected to be recognized	$376.70
Restricted Stock Units (RSUs) [Member] | First Vesting Period [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Compensation expense recognized, vesting term	'3 months
Restricted Stock Units (RSUs) [Member] | Second Vesting Period [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Compensation expense recognized, vesting term	'3 months
Restricted Stock Units (RSUs) [Member] | Third Vesting Period [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Compensation expense recognized, vesting term	'3 months
Restricted Stock Units (RSUs) [Member] | Fourth Vesting Period [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Compensation expense recognized, vesting term	'3 months
2012 Equity Incentive Plan [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Number of shares of common stock outstanding, increase, percentage	5.00%
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized	7,017,730
2012 Employee Stock Purchase Plan [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Number of shares of common stock outstanding, increase, percentage	1.00%
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized	1,403,546
Common stock purchase price percentage	85.00%
Award offering period	'6 months

Stock_Awards_Summary_of_stock_

Stock Awards - Summary of stock option activity (Detail) (USD $)	9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014
Summary of stock option activity	'
Number of Shares, Outstanding, Beginning Balance	23,399,374
Number of Shares, Granted	657,144
Number of Shares, Exercised	-5,616,272
Number of shares, Cancelled	-616,158
Number of Shares, Outstanding, Ending Balance	17,824,088
Number of Shares, Vested and expected to vest	17,577,162
Number of Shares, Vested and exercisable	9,597,716
Weighted-Average Exercise Price	'
Weighted-Average Exercise Price, Outstanding, Beginning Balance, usd per share	$9.07
Weighted-Average Exercise Price, Granted, usd per share	$60.73
Weighted-Average Exercise Price, Exercised, usd per share	$6.34
Weighted-Average Exercise Price Cancelled, usd per share	$20.06
Weighted-Average Exercise Price, Outstanding, Ending Balance, usd per share	$11.44
Weighted-Average Exercise Price, Vested and expected to vest, usd per share	$11.18
Weighted-Average Exercise Price, Vested and exercisable, usd per share	$6.43
Weighted-Average Remaining Contractual Life	'7 years 29 days
Weighted-Average Remaining Contractual Term, Vested and expected to vest	'7 years 22 days
Weighted-Average Remaining Contractual Term, Vested and exercisable	'6 years 237 days
Aggregate Intrinsic Value, Exercised	$301,371
Aggregate Intrinsic Value, Outstanding	845,641
Aggregate Intrinsic Value, Vested and expected to vest	836,644
Aggregate Intrinsic Value, Vested and exercisable	$502,480

Stock_Awards_Stock_Awards_Rest

Stock Awards Stock Awards - Restricted Stock Unit Table (Details) (Restricted Stock Units (RSUs) [Member], USD $)	9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014
Restricted Stock Units (RSUs) [Member]	'
Shares Outstanding	'
Outstanding shares units beginning balance	5,427,509
Granted	5,569,859
Vested	-1,046,742
Forfeited	-540,129
Outstanding shares units ending balance	9,410,497
Expected to vest	8,928,425
Weighted-Average Grant Date Fair Value	'
Weighted-Average Grant Date Fair Value, Outstanding, Beginning Balance, usd per share	$34.02
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$61.03
Weighted-Average Grant Date Fair Value, Vested, usd per share	$28.59
Weighted-Average Grant Date Fair Value, Repurchased, usd per share	$44.16
Weighted-Average Grant Date Fair Value, Outstanding, Ending Balance, usd per share	$50.03
Aggregate Intrinsic Value, vested	$58,932
Aggregate Intrinsic Value, Non-vested	553,149
Aggregated Intrinsic Value, Expected to vest	$524,813
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	9,410,497

Net_Income_Loss_Per_Share_Attr2

Net Income (Loss) Per Share Attributable to Common Stockholders - Calculation of Basic and Diluted Net Income (Loss) Per Share Attributable to Common Stockholders (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Numerator:	'	'	'	'
Net loss	($41,050)	($14,713)	($134,724)	($49,476)
Net loss attributable to common stockholders - basic	-41,050	-14,713	-134,724	-49,476
Net loss attributable to common stockholders - diluted	($41,050)	($14,713)	($134,724)	($49,476)
Denominator:	'	'	'	'
Weighted-average shares used to compute net loss per share - basic and diluted	146,335,519	137,456,531	144,239,844	134,036,466
Net income (loss) per share attributable to common stockholders:	'	'	'	'
Earnings Per Share, Basic and Diluted	($0.28)	($0.11)	($0.93)	($0.37)

Net_Income_Loss_Per_Share_Attr3

Net Income (Loss) Per Share Attributable to Common Stockholders - Summary of Potentially Dilutive Securities (Detail)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Total potentially dilutive securities	43,110,698	30,563,988
Common stock options [Member]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Total potentially dilutive securities	17,824,088	25,453,497
Restricted Stock Units (RSUs) [Member]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Total potentially dilutive securities	9,410,497	4,755,522
Common stock subject to repurchase [Member]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Total potentially dilutive securities	29,712	118,963
ESPP obligations [Member]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Total potentially dilutive securities	280,355	236,006
Convertible Notes Payable [Member]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Total potentially dilutive securities	7,783,023	0
Warrant [Member]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Total potentially dilutive securities	7,783,023	0

Income_Taxes_Income_Taxes_Deta

Income Taxes Income Taxes (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Tax Disclosure [Abstract]	'	'	'	'
Effective income tax rate	-1.00%	-5.00%	-2.00%	-4.00%
Federal statutory rate	'	'	34.00%	34.00%

Information_about_Geographic_A2

Information about Geographic Areas - Revenues by Geographic Area, Based on Billing Location of Customer (Detail) (USD $)	3 Months Ended				9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Segment Reporting Information [Line Items]	'		'		'		'
Percentage of U.S. Revenues in North America	94.00%		94.00%		94.00%		94.00%
Revenues by geography	'		'		'		'
Revenues	$178,712		$111,259		$484,559		$299,420
North America [Member]	'		'		'		'
Revenues by geography	'		'		'		'
Revenues	120,435	[1]	76,851	[1]	329,660	[1]	208,851	[1]
EuropeMiddleEastAfrica [Member] [Domain]	'		'		'		'
Revenues by geography	'		'		'		'
Revenues	46,521	[2]	27,621	[2]	125,021	[2]	72,403	[2]
Asia Pacific and other [Member]	'		'		'		'
Revenues by geography	'		'		'		'
Revenues	$11,756		$6,787		$29,878		$18,166
[1]	Revenues attributed to the United States were approximately 94% of North America revenues for the three months ended September 30, 2014 and 2013 and the nine months ended September 30, 2014 and 2013.
[2]	Europe, the Middle East and Africa

Information_about_Geographic_A3

Information about Geographic Areas - Long-lived Assets by Geographic Area (Detail) (USD $)	Sep. 30, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
Segment Reporting Information [Line Items]	'		'
Long-lived assets	$96,977		$75,560
North America [Member]	'		'
Segment Reporting Information [Line Items]	'		'
Long-lived assets	65,312		52,937
EuropeMiddleEastAfrica [Member] [Domain]	'		'
Segment Reporting Information [Line Items]	'		'
Long-lived assets	19,887	[1]	18,017	[1]
Asia Pacific and other [Member]	'		'
Segment Reporting Information [Line Items]	'		'
Long-lived assets	$11,778		$4,606
[1]	Europe, the Middle East and Africa