Violin Memory (VMEMQ) 10-Q 9 Dec 13 2014 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Oct. 31, 2013	Nov. 30, 2013
Document And Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	31-Oct-13	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q3	'
Trading Symbol	'VMEM	'
Entity Registrant Name	'Violin Memory Inc	'
Entity Central Index Key	'0001407190	'
Current Fiscal Year End Date	'--01-31	'
Entity Filer Category	'Non-accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	82,475,181

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (Unaudited) (USD $)	Oct. 31, 2013	Jan. 31, 2013
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$82,429	$17,378
Short-term investments	51,753	'
Accounts receivable, net (including amounts due from a related party of $175 and $1,881 as of October 31, 2013 and January 31, 2013, respectively)	23,404	22,012
Inventory	34,372	24,089
Other current assets	4,831	6,020
Total current assets	196,789	69,499
Property and equipment, net	14,376	13,098
Other assets	6,153	5,553
Total assets	217,318	88,150
Current liabilities:	'	'
Accounts payable (including amounts due to a related party of $4,884 and $6,808 as of October 31, 2013 and January 31, 2013, respectively)	20,716	15,275
Accrued liabilities	18,795	15,133
Deferred revenue (including amounts received from a related party of $11,912 and $229 as of October 31, 2013 and January 31, 2013, respectively)	24,236	6,916
Total current liabilities	63,747	37,324
Long-term deferred revenue	11,794	6,102
Total liabilities	75,541	43,426
Commitments and contingencies (Note 8)	'	'
Stockholders' equity:	'	'
Convertible preferred stock, $0.0001 par value, 0 and 111,000 shares authorized as of October 31, 2013 and January 31, 2013, respectively; and 0 and 91,570 shares issued and outstanding as of October 31, 2013 and January 31, 2013, respectively	'	9
Common stock, $0.0001 par value, 1,000,000 and 250,000 shares authorized as of October 31, 2013 and January 31, 2013, respectively; 82,475 and 15,614 shares issued and outstanding as of October 31, 2013 and January 31, 2013, respectively	8	4
Additional paid-in capital	437,890	247,531
Accumulated other comprehensive loss	-23	-7
Accumulated deficit	-296,098	-202,813
Total stockholders' equity	141,777	44,724
Total liabilities and stockholders' equity	$217,318	$88,150

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)	Oct. 31, 2013	Jan. 31, 2013
In Thousands, except Share data, unless otherwise specified
Accounts receivables, amounts due from a related party	$175	$1,881
Accounts payable, amounts due to a related party	4,884	6,808
Deferred revenue from related party	11,912	229
Preferred stock, $0.0001 par value, 10,000 shares and 0 shares authorized as of October 31, 2013 and January 31, 2013; no shares issued and outstanding	'	'
Convertible preferred stock, shares authorized	10,000,000	0
Convertible preferred stock, shares issued	0	0
Convertible preferred stock, shares outstanding	0	0
Common stock, par value	$0.00	$0.00
Common stock, shares authorized	1,000,000,000	250,000,000
Common stock, shares issued	82,475,000	15,614,000
Common stock, shares outstanding	82,475,000	15,614,000
Convertible Preferred Stock [Member]	'	'
Preferred stock, par value	$0.00	$0.00
Convertible preferred stock, shares authorized	0	111,000,000
Convertible preferred stock, shares issued	0	91,570,000
Convertible preferred stock, shares outstanding	0	91,570,000

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (Unaudited) (USD $)	3 Months Ended				9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Oct. 31, 2013		Oct. 31, 2012		Oct. 31, 2013		Oct. 31, 2012
Revenue:	'		'		'		'
Product revenue (including related party sales of $2,479 and $1,894 for the three months ended October 31, 2013 and 2012, respectively; and $4,724 and $3,231 for the nine months ended October 31, 2013 and 2012, respectively)	$21,416		$19,325		$67,489		$48,380
Service revenue (including related party sales of $3,094 and $21 for the three months ended October 31, 2013 and 2012, respectively; and $3,279 and $21 for the nine months ended October 31, 2013 and 2012, respectively)	6,890		1,271		12,120		2,518
Total revenue	28,306		20,596		79,609		50,898
Cost of revenue:	'		'		'		'
Cost of product revenue (including related party purchases of $7,842 and $6,479 for the three months ended October 31, 2013 and 2012, respectively; and $21,117 and $21,254 for the nine months ended October 31, 2013 and 2012, respectively)	10,555	[1]	10,330	[1]	37,293	[1]	26,090	[1]
Cost of service revenue	2,382	[1]	1,354	[1]	5,704	[1]	2,878	[1]
Total cost of revenue	12,937		11,684		42,997		28,968
Gross profit	15,369		8,912		36,612		21,930
Operating expenses :	'		'		'		'
Sales and marketing	21,299	[1]	15,568	[1]	58,175	[1]	40,454	[1]
Research and development	20,111	[1]	14,061	[1]	54,845	[1]	39,076	[1]
General and administrative	6,627	[1]	4,606	[1]	14,777	[1]	15,956	[1]
Litigation settlement	350		'		350		'
Total operating expenses	48,387		34,235		128,147		95,486
Loss from operations	-33,018		-25,323		-91,535		-73,556
Other expense, net	-17		-43		-303		-59
Interest expense	-1,060		'		-1,402		-31
Loss before income taxes	-34,095		-25,366		-93,240		-73,646
Income taxes	18		33		45		48
Net loss	($34,113)		($25,399)		($93,285)		($73,694)
Net loss per share of common stock, basic and diluted	($0.85)		($1.79)		($3.92)		($5.58)
Shares used to compute net loss per share of common stock, basic and diluted	40,362		14,196		23,809		13,216
[1]	Includes stock-based compensation expense as follows: (Note 7): Cost of product revenue $ 37 $ 20 $ 76 $ 37 Cost of service revenue 124 243 775 345 Sales and marketing 2,101 1,356 5,381 2,895 Research and development 1,828 919 4,448 2,227 General and administrative 4,165 1,575 7,519 7,207 $ 8,255 $ 4,113 $ 18,199 $ 12,711

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Operations (Unaudited) (Parenthetical) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Cost of product revenue, related party purchases	$7,842	$6,479	$21,117	$21,254
Stock-based compensation expense	8,255	4,113	18,199	12,711
Product Revenue [Member]	'	'	'	'
Revenue from related party sales	2,479	1,894	4,724	3,231
Services Revenues [Member]	'	'	'	'
Revenue from related party sales	3,094	21	3,279	21
Cost of Product Revenue [Member]	'	'	'	'
Stock-based compensation expense	37	20	76	37
Cost of Service Revenue [Member]	'	'	'	'
Stock-based compensation expense	124	243	775	345
Sales and Marketing [Member]	'	'	'	'
Stock-based compensation expense	2,101	1,356	5,381	2,895
Research and Development [Member]	'	'	'	'
Stock-based compensation expense	1,828	919	4,448	2,227
General and Administrative [Member]	'	'	'	'
Stock-based compensation expense	$4,165	$1,575	$7,519	$7,207

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Comprehensive Loss (Unaudited) (USD $)	3 Months Ended				9 Months Ended
In Thousands, unless otherwise specified	Oct. 31, 2013		Oct. 31, 2012		Oct. 31, 2013		Oct. 31, 2012
Statement Of Income And Comprehensive Income [Abstract]	'		'		'		'
Net loss	($34,113)		($25,399)		($93,285)		($73,694)
Foreign currency translation adjustments, net of tax	-27	[1]	-26	[1]	-26	[1]	52	[1]
Unrealized holding gains on investments, net of tax	10	[1]	'		10	[1]	'
Comprehensive loss	($34,130)		($25,425)		($93,301)		($73,642)
[1]	Reclassification adjustments were not significant during each of the three and nine months ended October 31, 2013 and 2012.

Condensed_Consolidated_Stateme3

Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Oct. 31, 2013	Oct. 31, 2012
Cash flows from operating activities:	'	'
Net loss	($93,285)	($73,694)
Adjustments to reconcile net loss to net cash used in operating activities:	'	'
Depreciation and amortization	8,737	6,816
Provision for excess and obsolete inventory	587	1,116
Debt accretion cost	174	'
Stock-based compensation	18,199	12,711
Changes in operating assets and liabilities, net:	'	'
Accounts receivable	-1,392	-6,270
Inventory	-13,458	-11,266
Other assets	-258	-333
Accounts payable	3,375	-4,860
Accrued liabilities	2,659	4,880
Deferred revenue	23,012	7,091
Net cash used in operating activities	-51,650	-63,809
Cash flows from investing activities:	'	'
Purchase of property and equipment	-5,895	-9,521
Purchase of cost method investments	-604	-3,600
Purchase of short-term investments	-51,743	'
Net cash used in investing activities	-58,242	-13,121
Cash flows from financing activities:	'	'
Proceeds from issuance of convertible notes	5,160	2,698
Proceeds from issuance of preferred stock, net of issuance costs	20,953	78,261
Proceeds from debt and line of credit, net of issuance costs	20,078	'
Repayment of debt and lines of credit	-20,500	'
Proceeds from initial public offering, net of issuance costs	149,473	'
Repurchase of stock	-729	'
Proceeds from exercise of common stock options	508	150
Net cash provided by financing activities	174,943	81,109
Net increase in cash and cash equivalents	65,051	4,179
Cash and cash equivalents at beginning of period	17,378	22,604
Cash and cash equivalents at end of period	82,429	26,783
Supplemental disclosure of other cash flow information:	'	'
Taxes paid	39	1
Supplemental disclosure of non-cash investing and financing activities:	'	'
Transfer of inventory to property and equipment	2,589	3,045
Conversion of notes payable and accrued interest to convertible preferred stock	'	3,415
Settlement of loan receivable from officer in lieu of bonus payment	'	1,000
Issuance of Series D convertible preferred stock in connection with litigation	'	1,400
Vesting of early stock option exercises	91	'
Unpaid initial public offering costs	1,603	'
Conversion of convertible notes to common stock	$5,203	'

Organization_and_Summary_of_Si

Organization and Summary of Significant Accounting Policies	9 Months Ended
	Oct. 31, 2013
Accounting Policies [Abstract]	'
Organization and Summary of Significant Accounting Policies	'
	1. Organization and Summary of Significant Accounting Policies
	Description of Business
	Violin Memory, Inc. (the “Company”) was incorporated in the State of Delaware on March 9, 2005 under the name Violin Technologies, Inc. The Company re-incorporated as Violin Memory, Inc. in the State of Delaware on April 11, 2007. The Company is a developer and supplier of high-performance, persistent memory-based storage systems that are designed to bring storage performance in line with high-speed applications, servers and networks. These Flash Memory Arrays are specifically designed at each level of the system architecture, starting with memory and optimized through the array, to leverage the inherent capabilities of flash memory. These systems’ embedded software function together with the hardware to deliver their essential functionality. The Company is also a developer and supplier of Velocity PCIe Flash Memory Cards designed to leverage its persistent memory architecture in servers. The Company also recently introduced the Violin Symphony Management Software Suite and Maestro Memory Services Software Suite as software offerings enhancing the process to manage, monitor and protect application data in the enterprise data center. The Company sells its products through its global direct sales force, systems vendors, resellers and other channel partners. The Company operates in a single business segment.
	On September 12, 2013, the Company effected a two-for-one reverse stock split to its common stock for all stockholders of record as of September 12, 2013 with an automatic adjustment to the conversion ratio of the outstanding shares of convertible preferred stock to reflect the same reverse stock split ratio upon conversion of the convertible preferred stock into common stock. Based on the adjusted conversion ratio, two outstanding shares of preferred stock converted into one share of common stock, except for Series D convertible preferred stock for which every two shares converted into 1.016998402 shares of common stock. All information related to common stock, stock options, RSUs and earnings per share for prior periods has been retroactively adjusted to give effect to the two-for-one reverse stock split.
	On October 2, 2013, the Company closed its initial public offering, or IPO, of 18,000,000 shares of its common stock sold by the Company. The public offering price of the shares sold in the IPO was $9.00 per share. The total gross proceeds from the IPO to the Company were $162 million. After deducting underwriting discounts and commissions and IPO costs payable by the Company, the aggregate net proceeds to the Company totaled $145.8 million. During the fourth quarter of fiscal 2013, the Company had paid IPO costs of $2.1 million which were recorded in the condensed consolidated statement of cash flows as deferred IPO costs in that period. As of October 31, 2013, IPO costs of $1.6 million remained unpaid and these costs are expected to be paid in the Company’s fourth fiscal quarter. On November 1, 2013, the option held by the underwriters to purchase 2,700,000 additional shares of common stock from the Company at the public offering price, less underwriting discounts and commissions, expired.
	Basis of Presentation and Consolidation
	The accompanying condensed consolidated balance sheets and the condensed consolidated statements of operations, comprehensive loss, and cash flows are unaudited. These unaudited interim condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (“SEC”) regarding interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. As such, the information included in this Quarterly Report on Form 10-Q should be read in conjunction with the consolidated financial statements and accompanying notes included in the prospectus filed with the SEC pursuant to Rule 424(b) under the Securities Act of 1933, on September 27, 2013. The results of operations for the three and nine months ended October 31, 2013 are not necessarily indicative of the results to be expected for the year ended January 31, 2014 or for other interim periods or for future years.
	The accompanying unaudited condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All significant intercompany accounts and transactions have been eliminated in consolidation.
	Use of Estimates
	The preparation of consolidated financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. On an on-going basis, the Company evaluates its significant estimates, including those related to estimated selling prices for elements sold in multiple-element revenue arrangements, product warranty, determination of the fair value of stock options, carrying values of inventories, liabilities for unrecognized tax benefits and deferred income tax asset valuation allowances. The Company also uses estimates in determining the useful lives of property and equipment and in its provision for doubtful accounts. Actual results could differ from those estimates.
	Significant Accounting Policies
	The Company’s significant accounting policies have been described in Note 1 to the consolidated financial statements included in the prospectus filed with the SEC pursuant to Rule 424(b) under the Securities Act of 1933 on September 27, 2013. With exception of the discussion below, there have been no changes to the Company’s significant accounting policies described in the Prospectus that have had a material impact on the Company’s condensed consolidated financial statements and related notes.
	Investments
	The Company classifies its investments as available-for-sale at the time of purchase since it is the Company’s intent that these investments are available for current operations, and includes these investments on the condensed consolidated balance sheet as short-term or long-term investments depending on their maturity and management’s intention with regard to the utilization of these investments, as needed, to fund current operations. As of October 31, 2013, all investments have been classified as short-term.
	Investments are considered impaired when a decline in fair value is judged to be other-than-temporary. The Company consults with its investment managers and considers available quantitative and qualitative evidence in evaluating potential impairment of its investments on a quarterly basis. If the cost of an individual investment exceeds its fair value, the Company evaluates, among other factors, general market conditions, the duration and extent to which the fair value is less than cost, and its intent and ability to hold the investment. Once a decline in fair value is determined to be other-than-temporary, an impairment charge is recorded and a new cost basis in the investment is established.
	Significant Customers
	Customers that accounted for 10% or more of the Company’s revenue represented 20% and 24% of revenue for the three months ended October 31, 2013 and 2012, respectively, and 13% of revenue for the nine months ended October 31, 2012. No single customer accounted for 10% of more of the Company’s revenue for the nine months ended October 31, 2013. Revenue from our five largest customers for the three months ended October 31, 2013 and 2012 was 41% and 45%, respectively, and 32% and 43% for the nine months ended October 31, 2013 and 2012, respectively. As a consequence of our limited number of customers and the concentrated nature of their purchases, our revenue, gross margin and operating results may fluctuate significantly from period to period and are difficult to estimate.
	Recent Accounting Pronouncements
	In February 2013, the Financial Accounting Standards Board (“FASB”) issued additional guidance regarding the presentation of comprehensive income. The new guidance requires an entity to present the effects on net income line items of significant amounts reclassified out of accumulated other comprehensive income, but only if the item reclassified is required under GAAP to be reclassified to net income in its entirety in the same reporting period. An entity shall provide this information either on the face of the consolidated financial statements or in the notes to the consolidated financial statements. The guidance is effective for fiscal years beginning after December 15, 2012. The adoption of this guidance effective February 1, 2013 did not result in a material impact on the Company’s condensed consolidated financial statements.
	In March 2013, the FASB issued an accounting standard update requiring an entity to release into net income the entire amount of a cumulative translation adjustment related to its investment in a foreign entity when as a parent it either sells a part or all of its investment in a foreign entity or no longer holds a controlling financial interest in a subsidiary or group of assets within a foreign entity. This accounting standard update will be effective prospectively for the Company beginning in the first quarter of fiscal 2015. The Company does not expect the adoption of this accounting standard update will have a material impact on its condensed consolidated financial statements.

Balance_Sheet_Components

Balance Sheet Components	9 Months Ended
	Oct. 31, 2013
Organization Consolidation And Presentation Of Financial Statements [Abstract]	'
Balance Sheet Components	'
	2. Balance Sheet Components
	Inventory
	The following table shows the components of inventory as of the dates presented (in thousands):
		October 31, 2013			January 31, 2013
	Raw materials	$	11,202		$	4,067
	Finished goods		23,170			20,022
		$	34,372		$	24,089
	Property and equipment, net
	The following table shows the components of property and equipment as of the dates presented (in thousands):
		October 31, 2013			January 31, 2013
	Laboratory equipment	$	28,591		$	20,588
	Computer hardware and software		9,706			7,620
	Office furniture		305			219
	Leasehold improvements		137			676
			38,739			29,103
	Less: accumulated depreciation		(24,363	)		(16,005	)
		$	14,376		$	13,098
	Depreciation expense (including amortization of leasehold improvements) was $3.3 million and $1.6 million for the three months ended October 31, 2013 and 2012, respectively, and $8.7 million and $6.8 million for the nine months ended October 31, 2013 and 2012, respectively.
	Accrued liabilities
	The following table shows the components of accrued liabilities as of the dates presented (in thousands):
		October 31, 2013			January 31, 2013
	Compensation and benefits	$	9,821		$	6,915
	Professional fees		3,113			2,855
	Warranty		1,298			994
	Other		4,563			4,369
		$	18,795		$	15,133

Fair_Value_Measurements

Fair Value Measurements	9 Months Ended
	Oct. 31, 2013
Fair Value Disclosures [Abstract]	'
Fair Value Measurements	'
	3. Fair Value Measurements
	Assets Measured and Recorded at Fair Value on a Recurring Basis
	The Company measures its financial assets and liabilities at fair value. The inputs used in the valuation methodologies in measuring fair value are defined in the fair value hierarchy as follows:
	Level 1	Inputs are unadjusted quoted prices in active markets for identical assets or liabilities.
	Level 2	Inputs are quoted prices for similar assets and liabilities in active markets or inputs that are observable for the asset or liability, either directly or indirectly through market corroboration, for substantially the full term of the financial instrument.
	Level 3	Inputs are unobservable inputs based on the Company’s assumptions.
	A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement.
	The following tables present the fair value of our financial assets and liabilities using the above input categories (in thousands):
		October 31, 2013
		Level 1		Level 2		Level 3		Total
	Cash equivalents:
	Money market funds	$	47,516	$	—	$	—	$	47,516
	Commercial paper		—		5,250		—		5,250
	Treasury bills		—		18,000		—		18,000
	Total cash equivalents		47,516		23,250		—		70,766
	Short term investments:
	Corporate debt securities		—		4,830		—		4,830
	U.S. government and agency obligations		—		29,673		—		29,673
	Municipal obligations		—		9,753		—		9,753
	Commercial paper		—		7,497		—		7,497
	Total short term investments		—		51,753		—		51,753
		$	47,516	$	75,003	$	—	$	122,519
	The Company measures its cash equivalents and marketable securities at fair value. Money market funds are valued primarily using quoted market prices utilizing market observable inputs. The Company’s investments in commercial paper, treasury bills, corporate debt securities and federal and municipal obligations are classified within Level 2 as the market inputs to value these instruments consist of market yields, reported trades and broker/dealer quotes.
	No financial assets and liabilities measured at fair value on a recurring basis were held by the Company as of January 31, 2013. There have been no transfers between Level 1 and 2 during the three and nine months ended October 31, 2013.
	No assets or liabilities measured at fair value on a nonrecurring basis were held by the Company as of October 31, 2013 or January 31, 2013.
	Fair Value of Other Financial Instruments
	The carrying amounts of the Company’s accounts receivable, accounts payable, accrued liabilities and other liabilities approximate their fair value due to their short term maturities.

Investments

Investments	9 Months Ended
	Oct. 31, 2013
Investments Debt And Equity Securities [Abstract]	'
Investments	'
	4. Investments
	Short term investments at October 31, 2013 consist of U.S. corporate debt securities, U.S. government and municipal debt and agency obligations and commercial paper.
	All marketable securities are deemed by management to be available-for-sale and are reported at fair value. Net unrealized gains or losses that are not determined to be other-than-temporary are reported within stockholders’ equity on the Company’s condensed consolidated balance sheets as a component of accumulated comprehensive loss. Realized gains or losses are recorded based on the specific identification method. During the three and nine months ended October 31, 2013, the Company’s realized gains or losses on short-term investments were not material. The Company’s investments are further detailed in the table below (in thousands):
		October 31, 2013
		Amortized		Unrealized		Unrealized			Estimate Fair
		Cost		Gains		Losses			Value
	Corporate debt securities	$	4,829	$	2	$	—		$	4,831
	U.S. government and agency obligations		29,667		9		(4	)		29,672
	Municipal obligations		9,750		3		—			9,753
	Commercial paper		7,497		—		—			7,497
		$	51,743	$	14	$	(4	)	$	51,753
	The amortized cost and fair value of investments held as of October 31, 2013, by contractual years-to-maturity, are as follows (in thousands):
		Amortized		Fair
		Cost		Value
	Due within one year	$	42,709	$	42,717
	Due within one to two years		9,034		9,036
		$	51,743	$	51,753

Income_Taxes

Income Taxes	9 Months Ended
	Oct. 31, 2013
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	5. Income Taxes
	The Company’s quarterly provision for income taxes is based on an estimated effective annual income tax rate. The Company’s quarterly provision for income taxes also includes the tax impact of certain unusual or infrequently occurring items, if any, including changes in judgment about valuation allowances and effects of changes in tax laws or rates, in the interim period in which they occur.
	Income tax expense for the three months ended October 31, 2013 and 2012 was $18,000 and $33,000, respectively, and $45,000 and $48,000 for the nine months ended October 31, 2013 and 2012, respectively. As of October 31, 2013, the income tax rate varies from the United States statutory income tax rate primarily due to valuation allowances in the United States and taxable income generated by the Company’s foreign wholly-owned subsidiaries.
	The Company has a full valuation allowance against its net operating losses and research and development credits for both federal and state purposes. Utilization of the net operating loss carry forwards and credits may be subject to substantial annual limitations due to the ownership change limitations provided by the Internal Revenue Code of 1986, as amended, and similar state provisions. The annual limitations may result in the expiration of net operating losses and credits before utilization.
	The Company reviews the likelihood that it will realize the benefit of its deferred tax assets and, therefore, the need for valuation allowances on a quarterly basis. There is no corresponding income tax benefit recognized with respect to losses incurred and no corresponding income tax expense recognized with respect to earnings generated in jurisdictions with a valuation allowance. This causes variability in the Company’s effective tax rate. The Company intends to maintain the valuation allowances until it is more likely than not that the net deferred tax assets will be realized.
	As of October 31, 2013, the Company had no unrecognized tax benefits that would affect the Company’s effective tax rate if recognized.

Equity_Award_Plans

Equity Award Plans	9 Months Ended
	Oct. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Equity Award Plans	'
	6. Equity Award Plans
	The 2012 Stock Plan
	In November 2012, the Company’s stockholders approved the adoption of the of the 2012 Stock Incentive Plan (the “2012 Stock Plan”) as the successor plan to the 2005 Stock Plan effective at the completion of the Company’s IPO. Unexercised options under the 2005 Plan that cancel due to a grantee’s termination may be reissued under the 2012 Stock Plan. Under the 2012 Stock Plan, stock options, restricted shares, restricted stock units, and stock appreciation rights may be granted to employees, outside directors and consultants at not less than 100% of the fair value on the date of grant. These share awards and options generally expire ten years from the date of grant. Such share awards and options generally vest ratably over three to four years.
	Shares authorized under the 2012 Plan includes shares subject to outstanding awards and shares subject to vesting restrictions under the Company’s 2005 Plan and 7,500,000 shares which were authorized under the 2012 Plan. The reserve will automatically increase on the first day of each fiscal year beginning on February 1, 2014 in an amount equal to the lesser of (i) 5% of the outstanding shares of common stock on the last day of the immediately preceding fiscal year, or (ii) another amount determined by the Board of Directors. The 2012 Stock Plan is administered by the Compensation Committee of the Board of Directors (the “Compensation Committee”), and the Compensation Committee may terminate or amend the plan at any time.
	The following table summarizes the stock option activity related to shares of common stock under the Company’s 2005 and 2012 Plans (in thousands, except per share data):
						Outstanding Options
			Shares						Weighted-		Weighted-		Aggregate
									average		average
			Available			Number of			Exercise Price		Remaining		Intrinsic
			for Grant			Options			per Share		Contractual Life		Value (1)
	Balances, January 31, 2013			4,858			6,067		$	0.94	$	8.31	$	42,096
	Additional shares authorized			7,500			—
	RSUs granted			(6,208	)		—
	RSUs cancelled/forfeited			1,333			—
	Options granted			(305	)		305		$	8.79
	Options exercised			—			(576	)	$	0.89
	Options forfeited			364			(364	)	$	1.21
	Repurchase of shares			97			—
	Balances, October 31, 2013			7,639			5,432		$	1.38	$	7.51	$	29,300
	Options vested and expected to vest - October 31, 2013						5,222		$	1.3	$	7.51	$	28,463
	Options exercisable – October 31, 2013						4,559		$	0.89	$	7.52	$	26,267
		-1	Aggregate intrinsic value is based on the common stock price at each respective date presented.
	Restricted Stock Units
	The Company’s outstanding restricted stock units, or RSUs, vest upon the satisfaction of both a service condition and a liquidity condition. The service condition for the majority of these awards is satisfied over three to four years. The liquidity condition is satisfied upon the occurrence of a qualifying event, defined as a change in control transaction or the earlier of (a) 181 days following the completion of an initial public offering or (b) the March 15th of the year following the completion of an initial public offering. The liquidity condition will be satisfied on March 15, 2014. RSUs for which the service condition has been satisfied are not forfeited should an employee terminate prior to the liquidity condition being met. Share-based compensation expense related to these grants is based on the grant date fair value of the RSUs and is recognized on a straight-line basis over the applicable service period.
	The table below summarizes the RSU activity under the Company’s 2005 and 2012 Plans (in thousands, except per share data):
						Weighted-
			Number			average			Aggregate
			of RSUs			grant date			intrinsic
			outstanding			fair value			value (1)
	Balance, January 31, 2013			8,463		$	6.52		$	63,469
	RSUs granted			6,208			8.19
	RSUs vested			(100	)		6.11
	RSUs cancelled/forfeited			(1,295	)		7.06
	Balance, October 31, 2013			13,276		$	7.17		$	88,285
		-1	Aggregate intrinsic value is based on the common stock price at each respective date presented.
	As of October 31, 2013, the outstanding restricted stock units include 3.3 million of RSUs for which the service condition was satisfied and will vest on March 15, 2014 upon satisfaction of the liquidity condition.
	Under net settlement procedures applicable to the March 15, 2014 vesting date, RSUs are withheld to cover the required withholding tax, which is based on the value of the RSU on the applicable settlement date. The remaining amounts are delivered to the recipient as shares of the Company’s common stock. Outstanding restricted stock units of 4.7 million shares are expected to vest on March 15, 2014 upon satisfaction of both the service condition through that date and liquidity condition as discussed above.
	Non-employee Stock Options and Awards
	The Company granted 5,000 stock options to non-employees in the nine months ended October 31, 2013. No options were granted to non-employees for the nine months ended October 31, 2012. For the nine months ended October 31, 2013 and 2012, the Company granted 292,500 and 240,000 restricted shares of common stock to non-employees, respectively.
	Employee Stock Purchase Plan
	In November 2012, the Company’s stockholders approved the adoption of the 2012 Employee Stock Purchase Plan (the “2012 Purchase Plan”). A total of 1,000,000 shares have been reserved for issuance under the 2012 Purchase Plan, and the number of shares available for issuance under the 2012 Purchase Plan automatically increases on February 1 each year, beginning in 2014, by the lesser of 0.75% of the shares of common stock then outstanding or 1,000,000 shares. The 2012 Purchase Plan permits eligible employees to purchase common stock on favorable terms via payroll deductions of up to 15% of the employee’s salary, subject to certain share and statutory dollar limits. Two overlapping offering periods commence during each calendar year, on each June 1 and December 1 or such other periods or dates as determined by the Compensation Committee from time to time, and the offering periods last up to 27 months with a purchase date every six months. The price of each share purchased is 85% of the lower of a) the fair value per share of common stock on the last trading day before the commencement of the applicable offering period, or in the case of an offering period that commences on the IPO, 85% of the price at which one share of stock was offered to the public in the IPO, or b) the fair value per share of common stock on the purchase date. The 2012 Purchase Plan is administered by the Compensation Committee, and the Compensation Committee may terminate or amend the plan at any time.

StockBased_Compensation

Stock-Based Compensation	9 Months Ended
	Oct. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Stock-Based Compensation	'
	7. Stock-Based Compensation
	As of October 31, 2013, total stock-based compensation cost related to unvested equity awards not yet recognized, net of estimated forfeitures, totaled $56.4 million. The Company expects to amortize $6.3 million in the fourth quarter of fiscal 2014, $23.8 million in fiscal 2015, $16.0 million in fiscal 2016 and $10.3 million in fiscal 2017. There was no capitalized stock-based compensation expense for any period presented.
	The Company uses the Black-Scholes option pricing model to estimate the fair value of options and purchase rights under the ESPP. This model requires the input of highly subjective assumptions included the expected term of the option, expected stock price volatility, dividend yield and risk-free interest rate. The Company used the following assumptions:
	Employee stock options	Three and Nine
		Months Ended
		October 31, 2013
	Expected life of options (in years)	4.6
	Expected volatility	50.20%
	Risk-free interest rate	1.50%
	Dividend yield	0%
	Employee stock purchase plan	Three and Nine
		Months Ended
		31-Oct-13
	Expected life (in years)	2.18
	Expected volatility	45.60%
	Risk-free interest rate	0.12%
	Dividend yield	0%
	During the three months ended October 31, 2013, the Company modified 225,000 options issued to a non-employee, accelerating the vesting of the award. The Company recognized a charge of $2.0 million within general and administrative expenses in the accompanying condensed consolidated statement of operations for the three months ended October 31, 2013 relating to this modification.

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
	Oct. 31, 2013
Commitments And Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	8. Commitments and Contingencies
	Litigation
	On August 22, 2012, GCA Savvian Advisors, LLC (“Savvian”) filed suit against the Company in the San Francisco County Superior Court, alleging breach of contract under a financial advisory services agreement. On November 2, 2012, the Company filed a response denying Savvian’s allegations and a cross-complaint against Savvian for fraud, breach of fiduciary duty, negligent representation and breach of contract. On December 7, 2012, Savvian filed a motion to dismiss, which was denied by the court on March 13, 2013. Savvian filed a response to the Company’s complaint on March 26, 2013, denying the Company’s allegations and asserting additional defenses. On August 26, 2013, Savvian filed an amended complaint seeking payment of offering fees of $10 million, as well as interest, damages and attorney’s fees. The Company filed a response to the amended complaint on October 2, 2013, again denying the allegations. The parties are currently conducting discovery. Trial in the matter is scheduled for July 2014. The Company believes the asserted claims are without merit and intend to vigorously defend itself.
	Beginning on November 26, 2013, several purported class action lawsuits were filed in the United States District Court for the Northern District of California, naming as defendants the Company, a number of present or former directors and officers, and several underwriters of the Company’s September 27, 2013 initial public offering, or IPO. The complaints purport to assert claims under the federal securities laws on behalf of purchasers of the Company’s common stock issued in the IPO or purchased in the market through November 21, 2013, and seek damages in an unspecified amount and other relief. The Company believes the asserted claims are without merit and intend to vigorously defend ourselves.
	Indemnification
	The Company indemnifies its officers and directors for certain events or occurrences, subject to certain limits, while the officer or director is or was serving at the Company’s request in such capacity. The Company’s certificate of incorporation and bylaws require that it indemnify its officers and directors against expenses, judgments, fines, settlements and other amounts actually and reasonably incurred in connection with any proceedings arising out of their services to the Company. In addition, the Company has entered into separate indemnification agreements with each of its directors and executive officers, which provide for indemnification of these individuals under certain circumstances. The maximum amount of potential future indemnification is unlimited; however, the Company has a Directors and Officers insurance policy that enables the Company to recover a portion of any future amounts paid. Historically, the Company has not been obligated to make any payments for these obligations and no liabilities have been recorded for these obligations on the condensed consolidated balance sheets as of October 31, 2013 and January 31, 2013.
	The Company may, in the ordinary course of business, agree to defend and indemnify some customers against legal claims that the Company’s products infringe on certain U.S. patents or copyrights. The terms of such obligations may vary. To date, the Company has not been required to make any payments resulting from such infringement indemnifications and no amounts have been accrued for such matters.
	Other Contingencies
	From time to time, the Company may become involved in legal proceeding or other claims and assessments arising in the ordinary course of business. The Company is not currently a party to any litigation matters, except as discussed above, which, individually or in the aggregate, are expected to have a material adverse effect on the Company’s business, financial condition or results of operations.

RelatedParty_Transactions

Related-Party Transactions	9 Months Ended
	Oct. 31, 2013
Related Party Transactions [Abstract]	'
Related-Party Transactions	'
	9. Related-Party Transactions
	Toshiba
	As of October 31, 2013, Toshiba Corporation and its affiliates, including Toshiba America Electronic Components, Inc. (collectively Toshiba), owned 9.2 million shares of the Company’s common stock or 11% of the Company’s total common stock outstanding.
	In June 2011, the Company entered into a Sales Agreement with Toshiba pursuant to which the Company agreed to purchase at least 70% of its annual flash memory requirement from Toshiba.
	In July 2013, the Company signed an agreement with Toshiba for the development of PCIe cards and the sale of sample cards and received a prepayment of $16 million. The $16 million prepayment consisted of $8 million for services to be performed for the development of the PCIe cards and $8 million for the sale of sample PCIe cards and related support services. The Company retains all ownership of the intellectual property developed under the agreement. The Company applied ASC 605-25 to identify the deliverables. The Company concluded that the deliverables are development services, sample PCIe cards and support services for the sample PCIe cards. The Company recognized $3.0 million of revenue related to development of PCIe cards and $1.4 million of revenue related to sample products during the three and nine months ended October 31, 2013 as determined on a relative fair value basis. The remaining $11.6 million prepayment is classified as short-term deferred revenue on the accompanying condensed consolidated balance sheet as of October 31, 2013.
	All amounts related to the services or the sample PCIe cards that have not been completed as of August 31, 2014 are refundable and must be repaid to Toshiba by September 15, 2014. Further, this arrangement states that if a separate OEM Supply and Manufacturing License Agreement is not signed between both parties by April 30, 2014, all amounts related to incomplete milestones under the current agreement as of that date are refundable and must be repaid to Toshiba by September 15, 2014. The Company and Toshiba are currently negotiating an OEM Supply and Manufacturing License Agreement, but there can be no guarantee that such an agreement will be completed and executed by the parties. The current development agreement commits the Company to a 20% discount off of the OEM prices that would have otherwise been prescribed in the OEM Supply and Manufacturing License Agreement, to the extent such an agreement is signed by both parties in the future. This discount would be applied to future sales of PCIe cards to Toshiba that are manufactured and supplied by the Company.
	The Company analyzed the transaction under relevant literature for research and development arrangements. The Company determined that upon satisfaction of individual milestones or shipment of the sample PCIe cards there was no (i) guarantee or contractual commitment to repay funds to Toshiba regardless of the outcome of the research and development, (ii) Toshiba has no rights to any intellectual property developed under this agreement and, therefore, cannot require the Company to purchase their interest in the research and development regardless of the outcome, and (iii) Toshiba will not receive debt or equity securities of the entity upon termination or completion of the research and development regardless of the outcome. Upon acceptance of the individual service milestones or delivery of the sample PCIe cards, the related prepaid amounts received from Toshiba become nonrefundable.
	Management also considered whether the current development agreement and the potential OEM Supply and Manufacturing License Agreement that was not executed as of October 31, 2013 should be considered one arrangement for accounting purposes. The Company determined that any potential deliverables that might be included in the OEM Supply and Manufacturing License Agreement are contingent deliverables that are dependent upon the successful development and completion of the PCIe cards under the current development agreement for which there is substantial uncertainty. The Company will retain all intellectual property under the current development agreement and will negotiate the terms of supply or license arrangements on an arms-length basis. Therefore, the Company determined that the OEM Supply and Manufacturing License Agreement and the current development agreement are two separate arrangements for accounting purposes.
	The Company has determined that development services, sample PCIe cards and support service for the sample PCIe cards each represent a separate unit of accounting as each can be sold separately and have standalone value. Revenue allocated to development services are recognized upon acceptance of each milestone by Toshiba on a relative fair value basis to the extent that it is not contingent and not otherwise refundable. Revenue allocated to sample PCIe cards is recognized upon delivery and amounts allocated to support services for the sample PCIe cards are recognized over the term of the support period, which is generally one year. Any incremental research and development expense related to this arrangement is recognized as cost of services. During the three and nine months ended October 31, 2013, the Company recognized incremental cost of services of $0.7 million.
	In addition to the above, the Company recognized revenue of $1.2 million and $1.9 million related to the sale of Flash Memory Arrays and services to Toshiba during the three months ended October 31, 2013 and 2012, respectively and $3.5 and $3.2 million during the nine months ended October 31, 2013 and 2012, respectively.
	The Company purchased $7.8 million and $6.5 million of NAND flash memory from Toshiba during the three months ended October 31, 2013 and 2012, respectively and $21.1 million and $21.3 million during the nine months ended October 31, 2013 and 2012, respectively.

Segment_Information

Segment Information	9 Months Ended
	Oct. 31, 2013
Segment Reporting [Abstract]	'
Segment Information	'
	10. Segment Information
	Operating segments are defined as components of an enterprise about which separate financial information is available that is evaluated regularly by the chief operating decision maker, the Company’s chief executive officer. The Company’s chief executive officer reviews financial information presented on a consolidated basis, accompanied by information about revenue by geographic region for purposes of allocating resources and evaluating financial performance. The Company has one business activity, and there are no segment managers who are held accountable for operations, operating results and plans for levels or components below the consolidated unit level. Accordingly, the Company considers itself to be in a single reportable segment and operating unit structure.
	Revenue by geography is based on the billing address of the customer. The following table sets forth revenue and property and equipment by geographic area (in thousands):
		Three Months Ended October 31,				Nine Months Ended October 31,
		2013		2012		2013		2012
	Revenue
	Americas:
	United States	$	16,432	$	15,747	$	52,776	$	38,467
	Other Americas		195		340		404		349
			16,627		16,087		53,180		38,816
	Europe:
	United Kingdom		1,027		1,570		2,853		3,825
	Other Europe		3,063		1,533		7,071		1,877
			4,090		3,103		9,924		5,702
	Asia Pacific:
			7,589		1,406		16,505		6,380
		$	28,306	$	20,596	$	79,609	$	50,898
	Property and Equipment	October 31, 2013		January 31, 2013
	United States	$	13,924	$	12,426
	Europe		446		672
	Asia Pacific		6		—
		$	14,376	$	13,098

Net_Loss_Per_Share

Net Loss Per Share	9 Months Ended
	Oct. 31, 2013
Earnings Per Share [Abstract]	'
Net Loss Per Share	'
	11. Net Loss Per Share
	Basic net loss per share is computed by dividing the net loss by the weighted-average number of shares of common stock outstanding during the period, less the weighted-average unvested common stock subject to repurchase or forfeiture. Diluted net loss per share is computed by giving effect to all potential shares of common stock, including preferred stock, stock options and warrants, to the extent dilutive. Basic and diluted net loss per share was the same for each period presented as the inclusion of all potential common shares outstanding would have been anti-dilutive. The following table sets forth the computation of historical basic and diluted net loss per share (in thousands, except per share data):
		Three Months Ended October 31,						Nine Months Ended October 31,
		2013			2012			2013			2012
	Numerator:
	Net loss	$	(34,113	)	$	(25,399	)	$	(93,285	)	$	(73,694	)
	Denominator:
	Weighted average common shares outstanding		40,491			15,471			24,042			15,397
	Less: Weighted average unvested common shares subject to repurchase		129			1,275			233			2,181
	Weighted average shares used to compute net loss per share of common stock, basic and diluted		40,362			14,196			23,809			13,216
	Net loss per share of common stock, basic and diluted	$	(0.85	)	$	(1.79	)	$	(3.92	)	$	(5.58	)
	Since the Company experienced losses for all periods presented, basic net loss per share is the same as diluted net loss per share for all periods. The following potential common stock equivalents that could potentially dilute net loss per share in the future were excluded from the computation of diluted net loss per share because including them would have been anti-dilutive for the periods presented (in thousands):
		Three Months Ended October 31,						Nine Months Ended October 31,
		2013			2012			2013			2012
	Convertible preferred stock (on an as converted basis)		—			45,190			—			45,190
	Common stock subject to repurchase		111			553			111			553
	Warrants related to common stock		84			—			84			—
	Shares subject to outstanding common stock options and restricted stock units		18,708			14,936			18,708			14,936
			18,903			60,679			18,903			60,679

Debt_and_Line_of_Credit

Debt and Line of Credit	9 Months Ended
	Oct. 31, 2013
Debt Disclosure [Abstract]	'
Debt and Line of Credit	'
	12. Debt and Line of Credit
	Debt Facility
	During May 2013, the Company entered into a $50 million debt arrangement with TriplePoint Capital LLC, or TriplePoint. The facility has first secured interest in substantially all of the Company’s assets and intellectual property other than $7.5 million of accounts receivable. The Company has one year to utilize the facility which has a number of borrowing options ranging in duration from three months up to five years. Depending on the loan option, annualized interest rates range from 7.00% to 13.50%. In addition, the loans have an end-of-term payment, ranging from 0.50% to 14.00% of the principal amount depending on the duration of the loan. As of October 31, 2013, the Company has repaid all amounts outstanding on this facility.
	There are no financial covenants in this debt facility. However, the Company agreed with TriplePoint to certain operating covenants, including a requirement to obtain TriplePoint’s consent to a merger or acquisition of the Company if its obligations to TriplePoint are not repaid in connection with such merger or acquisition, a requirement to obtain TriplePoint’s consent before the Company acquires another company under certain circumstances, a prohibition on certain investments in third parties, restrictions on the Company’s ability to pay dividends or make distributions and a prohibition to engage in any business other than the businesses the Company is currently engaged in or reasonably related to the Company’s current businesses.
	The debt agreement with TriplePoint contains a clause that allows TriplePoint to declare an event of default if, in the determination and explicit discretion of the lender, the Company experiences a material adverse change to its business. Under this debt facility, a material adverse change means: a material adverse effect on the Company’s business, operations, properties, assets or financial condition; a material adverse effect on the Company’s ability to perform its obligations under the terms of the debt facility agreement; or a material adverse effect on the assets that the Company used to secure its obligations under the debt facility or TriplePoint’s ability to enforce its security rights in those assets. In the event the lender declares an event of default, all amounts outstanding under this facility would become immediately due and payable and further advances under the facility would not be available. As of October 31, 2013, the Company was not in default on its debt facility with TriplePoint.
	As of October 31, 2013, the Company believes this facility was available. However, there can be no assurances that the funds will be available in the future or at the amount requested.
	Line of Credit
	As of October 31, 2013, the Company had no amounts outstanding on its line of credit. The Company can borrow up to 80% of its current U.S.-based receivables, or $7.5 million, whichever is lower. The line is secured against the Company’s accounts receivable and collections thereof as well as its intellectual property. The line has a term of two years and bears the interest rate of prime plus 1% (4.25% as of October 31, 2013).
	Convertible Notes
	In June 2013, the Company issued and sold convertible promissory notes for an aggregate amount of $2.5 million pursuant to a note and warrant purchase agreement. Further in August 2013, the Company issued and sold additional convertible promissory notes for an aggregate amount of $2.7 million. The notes had an interest rate of 10%. The outstanding principal and accrued interest converted, upon completion of the IPO, into Company’s common stock at $9.00 per share.

Organization_and_Summary_of_Si1

Organization and Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Oct. 31, 2013
Accounting Policies [Abstract]	'
Description of Business	'
	Description of Business
	Violin Memory, Inc. (the “Company”) was incorporated in the State of Delaware on March 9, 2005 under the name Violin Technologies, Inc. The Company re-incorporated as Violin Memory, Inc. in the State of Delaware on April 11, 2007. The Company is a developer and supplier of high-performance, persistent memory-based storage systems that are designed to bring storage performance in line with high-speed applications, servers and networks. These Flash Memory Arrays are specifically designed at each level of the system architecture, starting with memory and optimized through the array, to leverage the inherent capabilities of flash memory. These systems’ embedded software function together with the hardware to deliver their essential functionality. The Company is also a developer and supplier of Velocity PCIe Flash Memory Cards designed to leverage its persistent memory architecture in servers. The Company also recently introduced the Violin Symphony Management Software Suite and Maestro Memory Services Software Suite as software offerings enhancing the process to manage, monitor and protect application data in the enterprise data center. The Company sells its products through its global direct sales force, systems vendors, resellers and other channel partners. The Company operates in a single business segment.
	On September 12, 2013, the Company effected a two-for-one reverse stock split to its common stock for all stockholders of record as of September 12, 2013 with an automatic adjustment to the conversion ratio of the outstanding shares of convertible preferred stock to reflect the same reverse stock split ratio upon conversion of the convertible preferred stock into common stock. Based on the adjusted conversion ratio, two outstanding shares of preferred stock converted into one share of common stock, except for Series D convertible preferred stock for which every two shares converted into 1.016998402 shares of common stock. All information related to common stock, stock options, RSUs and earnings per share for prior periods has been retroactively adjusted to give effect to the two-for-one reverse stock split.
	On October 2, 2013, the Company closed its initial public offering, or IPO, of 18,000,000 shares of its common stock sold by the Company. The public offering price of the shares sold in the IPO was $9.00 per share. The total gross proceeds from the IPO to the Company were $162 million. After deducting underwriting discounts and commissions and IPO costs payable by the Company, the aggregate net proceeds to the Company totaled $145.8 million. During the fourth quarter of fiscal 2013, the Company had paid issuance costs of $2.1 million which were recorded in the condensed consolidated statement of cash flows as deferred IPO costs in that period. As of October 31, 2013, issuance costs of $1.6 million remained unpaid and these costs are expected to be paid in the Company’s fourth fiscal quarter. On November 1, 2013, the option held by the underwriters to purchase 2,700,000 additional shares of common stock from the Company at the public offering price, less underwriting discounts and commissions, expired.
Basis of Presentation and Consolidation	'
	Basis of Presentation and Consolidation
	The accompanying condensed consolidated balance sheets and the condensed consolidated statements of operations, comprehensive loss, and cash flows are unaudited. These unaudited interim condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) and applicable rules and regulations of the Securities and Exchange Commission ( “SEC”) regarding interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. As such, the information included in this Quarterly Report on Form 10-Q should be read in conjunction with the consolidated financial statements and accompanying notes included in the prospectus filed with the SEC pursuant to Rule 424(b) under the Securities Act of 1933, on September 27, 2013. The results of operations for the three and nine months ended October 31, 2013 are not necessarily indicative of the results to be expected for the year ended January 31, 2014 or for other interim periods or for future years.
	The accompanying unaudited condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All significant intercompany accounts and transactions have been eliminated in consolidation.
Use of Estimates	'
	Use of Estimates
	The preparation of consolidated financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. On an on-going basis, the Company evaluates its significant estimates, including those related to estimated selling prices for elements sold in multiple-element revenue arrangements, product warranty, determination of the fair value of stock options, carrying values of inventories, liabilities for unrecognized tax benefits and deferred income tax asset valuation allowances. The Company also uses estimates in determining the useful lives of property and equipment and in its provision for doubtful accounts. Actual results could differ from those estimates.
Significant Accounting Policies	'
	Significant Accounting Policies
	The Company’s significant accounting policies have been described in Note 1 to the consolidated financial statements included in the prospectus filed with the SEC pursuant to Rule 424(b) under the Securities Act of 1933 on September 27, 2013. With exception of the discussion below, there have been no changes to the Company’s significant accounting policies described in the Prospectus that have had a material impact on the Company’s condensed consolidated financial statements and related notes.
Investments	'
	Investments
	The Company classifies its investments as available-for-sale at the time of purchase since it is the Company’s intent that these investments are available for current operations, and includes these investments on the condensed consolidated balance sheet as short-term or long-term investments depending on their maturity and management’s intention with regard to the utilization of these investments, as needed, to fund current operations. As of October 31, 2013, all investments have been classified as short-term.
	Investments are considered impaired when a decline in fair value is judged to be other-than-temporary. The Company consults with its investment managers and considers available quantitative and qualitative evidence in evaluating potential impairment of its investments on a quarterly basis. If the cost of an individual investment exceeds its fair value, the Company evaluates, among other factors, general market conditions, the duration and extent to which the fair value is less than cost, and its intent and ability to hold the investment. Once a decline in fair value is determined to be other-than-temporary, an impairment charge is recorded and a new cost basis in the investment is established.
Significant Customers	'
	Significant Customers
	Customers that accounted for 10% or more of the Company’s revenue represented 20% and 24% of revenue for the three months ended October 31, 2013 and 2012, respectively, and 13% of revenue for the nine months ended October 31, 2012. No single customer accounted for 10% of more of the Company’s revenue for the nine months ended October 31, 2013. Revenue from our five largest customers for the three months ended October 31, 2013 and 2012 was 41% and 45%, respectively, and 32% and 43% for the nine months ended October 31, 2013 and 2012, respectively. As a consequence of our limited number of customers and the concentrated nature of their purchases, our revenue, gross margin and operating results may fluctuate significantly from period to period and are difficult to estimate.
Recent Accounting Pronouncements	'
	Recent Accounting Pronouncements
	In February 2013, the Financial Accounting Standards Board (“FASB”) issued additional guidance regarding the presentation of comprehensive income. The new guidance requires an entity to present the effects on net income line items of significant amounts reclassified out of accumulated other comprehensive income, but only if the item reclassified is required under GAAP to be reclassified to net income in its entirety in the same reporting period. An entity shall provide this information either on the face of the consolidated financial statements or in the notes to the consolidated financial statements. The guidance is effective for fiscal years beginning after December 15, 2012. The adoption of this guidance effective February 1, 2013 did not result in a material impact on the Company’s condensed consolidated financial statements.
	In March 2013, the FASB issued an accounting standard update requiring an entity to release into net income the entire amount of a cumulative translation adjustment related to its investment in a foreign entity when as a parent it either sells a part or all of its investment in a foreign entity or no longer holds a controlling financial interest in a subsidiary or group of assets within a foreign entity. This accounting standard update will be effective prospectively for the Company beginning in the first quarter of fiscal 2015. The Company does not expect the adoption of this accounting standard update will have a material impact on its condensed consolidated financial statements.

Balance_Sheet_Components_Table

Balance Sheet Components (Tables)	9 Months Ended
	Oct. 31, 2013
Organization Consolidation And Presentation Of Financial Statements [Abstract]	'
Schedule of Inventory Components	'
	The following table shows the components of inventory as of the dates presented (in thousands):
		October 31, 2013			January 31, 2013
	Raw materials	$	11,202		$	4,067
	Finished goods		23,170			20,022
		$	34,372		$	24,089
Schedule of Components of Property and Equipment	'
	The following table shows the components of property and equipment as of the dates presented (in thousands):
		October 31, 2013			January 31, 2013
	Laboratory equipment	$	28,591		$	20,588
	Computer hardware and software		9,706			7,620
	Office furniture		305			219
	Leasehold improvements		137			676
			38,739			29,103
	Less: accumulated depreciation		(24,363	)		(16,005	)
		$	14,376		$	13,098
Schedule of Components of Accrued Liabilities	'
	The following table shows the components of accrued liabilities as of the dates presented (in thousands):
		October 31, 2013			January 31, 2013
	Compensation and benefits	$	9,821		$	6,915
	Professional fees		3,113			2,855
	Warranty		1,298			994
	Other		4,563			4,369
		$	18,795		$	15,133

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	9 Months Ended
	Oct. 31, 2013
Fair Value Disclosures [Abstract]	'
Summary of Financial Assets and Liabilities Measured at Fair Value	'
	The following tables present the fair value of our financial assets and liabilities using the above input categories (in thousands):
		October 31, 2013
		Level 1		Level 2		Level 3		Total
	Cash equivalents:
	Money market funds	$	47,516	$	—	$	—	$	47,516
	Commercial paper		—		5,250		—		5,250
	Treasury bills		—		18,000		—		18,000
	Total cash equivalents		47,516		23,250		—		70,766
	Short term investments:
	Corporate debt securities		—		4,830		—		4,830
	U.S. government and agency obligations		—		29,673		—		29,673
	Municipal obligations		—		9,753		—		9,753
	Commercial paper		—		7,497		—		7,497
	Total short term investments		—		51,753		—		51,753
		$	47,516	$	75,003	$	—	$	122,519

Investments_Tables

Investments (Tables)	9 Months Ended
	Oct. 31, 2013
Investments Debt And Equity Securities [Abstract]	'
Schedule of Investments	'
	The Company’s investments are further detailed in the table below (in thousands):
		October 31, 2013
		Amortized		Unrealized		Unrealized			Estimate Fair
		Cost		Gains		Losses			Value
	Corporate debt securities	$	4,829	$	2	$	—		$	4,831
	U.S. government and agency obligations		29,667		9		(4	)		29,672
	Municipal obligations		9,750		3		—			9,753
	Commercial paper		7,497		—		—			7,497
		$	51,743	$	14	$	(4	)	$	51,753
Amortized Cost and Fair Value of Investments by Contractual Years-to-Maturity	'
	The amortized cost and fair value of investments held as of October 31, 2013, by contractual years-to-maturity, are as follows (in thousands):
		Amortized		Fair
		Cost		Value
	Due within one year	$	42,709	$	42,717
	Due within one to two years		9,034		9,036
		$	51,743	$	51,753

Equity_Award_Plans_Tables

Equity Award Plans (Tables)	9 Months Ended
	Oct. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Summary of Stock Option Activity	'
	The following table summarizes the stock option activity related to shares of common stock under the Company’s 2005 and 2012 Plans (in thousands, except per share data):
						Outstanding Options
			Shares						Weighted-		Weighted-		Aggregate
									average		average
			Available			Number of			Exercise Price		Remaining		Intrinsic
			for Grant			Options			per Share		Contractual Life		Value (1)
	Balances, January 31, 2013			4,858			6,067		$	0.94	$	8.31	$	42,096
	Additional shares authorized			7,500			—
	RSUs granted			(6,208	)		—
	RSUs cancelled/forfeited			1,333			—
	Options granted			(305	)		305		$	8.79
	Options exercised			—			(576	)	$	0.89
	Options forfeited			364			(364	)	$	1.21
	Repurchase of shares			97			—
	Balances, October 31, 2013			7,639			5,432		$	1.38	$	7.51	$	29,300
	Options vested and expected to vest - October 31, 2013						5,222		$	1.3	$	7.51	$	28,463
	Options exercisable – October 31, 2013						4,559		$	0.89	$	7.52	$	26,267
		-1	Aggregate intrinsic value is based on the common stock price at each respective date presented.
Summary of Restricted Stock Units Activity	'
	The table below summarizes the RSU activity under the Company’s 2005 and 2012 Plans (in thousands, except per share data):
			Number			Weighted-			Aggregate
						average
			of RSUs			grant date			intrinsic
			outstanding			fair value			value (1)
	Balance, January 31, 2013			8,463		$	6.52		$	63,469
	RSUs granted			6,208			8.19
	RSUs vested			(100	)		6.11
	RSUs cancelled/forfeited			(1,295	)		7.06
	Balance, October 31, 2013			13,276		$	7.17		$	88,285
		-1	Aggregate intrinsic value is based on the common stock price at each respective date presented.

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	9 Months Ended
	Oct. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Schedule of Assumptions to Estimate Fair Value of Options and Purchase Rights under ESPP	'
	The Company uses the Black-Scholes option pricing model to estimate the fair value of options and purchase rights under the ESPP. This model requires the input of highly subjective assumptions included the expected term of the option, expected stock price volatility, dividend yield and risk-free interest rate. The Company used the following assumptions:
	Employee stock options	Three and Nine
		Months Ended
		October 31, 2013
	Expected life of options (in years)	4.6
	Expected volatility	50.20%
	Risk-free interest rate	1.50%
	Dividend yield	0%
	Employee stock purchase plan	Three and Nine
		Months Ended
		31-Oct-13
	Expected life (in years)	2.18
	Expected volatility	45.60%
	Risk-free interest rate	0.12%
	Dividend yield	0%

Segment_Information_Tables

Segment Information (Tables)	9 Months Ended
	Oct. 31, 2013
Segment Reporting [Abstract]	'
Schedule of Revenue and Property and Equipment by Geographic Area	'
	Revenue by geography is based on the billing address of the customer. The following table sets forth revenue and property and equipment by geographic area (in thousands):
		Three Months Ended October 31,				Nine Months Ended October 31,
		2013		2012		2013		2012
	Revenue
	Americas:
	United States	$	16,432	$	15,747	$	52,776	$	38,467
	Other Americas		195		340		404		349
			16,627		16,087		53,180		38,816
	Europe:
	United Kingdom		1,027		1,570		2,853		3,825
	Other Europe		3,063		1,533		7,071		1,877
			4,090		3,103		9,924		5,702
	Asia Pacific:
			7,589		1,406		16,505		6,380
		$	28,306	$	20,596	$	79,609	$	50,898
	Property and Equipment	October 31, 2013		January 31, 2013
	United States	$	13,924	$	12,426
	Europe		446		672
	Asia Pacific		6		—
		$	14,376	$	13,098

Net_Loss_Per_Share_Tables

Net Loss Per Share (Tables)	9 Months Ended
	Oct. 31, 2013
Earnings Per Share [Abstract]	'
Schedule of Computation of Historical Basic and Diluted Net Loss Per Share	'
	The following table sets forth the computation of historical basic and diluted net loss per share (in thousands, except per share data):
		Three Months Ended October 31,						Nine Months Ended October 31,
		2013			2012			2013			2012
	Numerator:
	Net loss	$	(34,113	)	$	(25,399	)	$	(93,285	)	$	(73,694	)
	Denominator:
	Weighted average common shares outstanding		40,491			15,471			24,042			15,397
	Less: Weighted average unvested common shares subject to repurchase		129			1,275			233			2,181
	Weighted average shares used to compute net loss per share of common stock, basic and diluted		40,362			14,196			23,809			13,216
	Net loss per share of common stock, basic and diluted	$	(0.85	)	$	(1.79	)	$	(3.92	)	$	(5.58	)
Schedule of Common Stock Equivalents Excluded from Computation of Diluted Net Loss Per Share	'
	The following potential common stock equivalents that could potentially dilute net loss per share in the future were excluded from the computation of diluted net loss per share because including them would have been anti-dilutive for the periods presented (in thousands):
		Three Months Ended October 31,						Nine Months Ended October 31,
		2013			2012			2013			2012
	Convertible preferred stock (on an as converted basis)		—			45,190			—			45,190
	Common stock subject to repurchase		111			553			111			553
	Warrants related to common stock		84			—			84			—
	Shares subject to outstanding common stock options and restricted stock units		18,708			14,936			18,708			14,936
			18,903			60,679			18,903			60,679

Organization_and_Summary_of_Si2

Organization and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)

9 Months Ended

0 Months Ended

9 Months Ended

0 Months Ended

3 Months Ended

0 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

Oct. 31, 2013

Jan. 31, 2013

Sep. 12, 2013

Sep. 12, 2013

Oct. 31, 2013

Oct. 02, 2013

Oct. 31, 2013

Jan. 31, 2014

Sep. 12, 2013

Sep. 12, 2013

Oct. 31, 2013

Oct. 31, 2012

Oct. 31, 2013

Oct. 31, 2012

Oct. 31, 2013

Oct. 31, 2012

Oct. 31, 2013

Oct. 31, 2012

Customer

Series D Preferred Stock [Member]

Convertible Preferred Stock [Member]

Minimum [Member]

IPO [Member]

IPO [Member]

IPO [Member]

Common Stock [Member]

Common Stock [Member]

Sales Revenue, Net [Member]

Sales Revenue, Net [Member]

Sales Revenue, Net [Member]

Sales Revenue, Net [Member]

Sales Revenue, Net [Member]

Sales Revenue, Net [Member]

Sales Revenue, Net [Member]

Sales Revenue, Net [Member]

Secondary Offering [Member]

Subsequent Event [Member]

Secondary Offering [Member]

Customer Concentration Risk [Member]

Customer Concentration Risk [Member]

Customer Concentration Risk [Member]

Customer Concentration Risk [Member]

Five Largest Customers [Member]

Five Largest Customers [Member]

Five Largest Customers [Member]

Five Largest Customers [Member]

Schedule Of Organization And Summary Of Significant Accounting Policies [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Reverse stock split

'two-for-one reverse stock split to its common stock for all stockholders of record as of September 12, 2013 with an automatic adjustment to the conversion ratio of the outstanding shares of convertible preferred stock to reflect the same reverse stock split ratio upon conversion of the convertible preferred stock into common stock. Based on the adjusted conversion ratio, two outstanding shares of preferred stock converted into one share of common stock, except for Series D convertible preferred stock for which every two shares converted into 1.016998402 shares of common stock. All information related to common stock, stock options, RSUs and earnings per share for prior periods has been retroactively adjusted to give effect to the two-for-one reverse stock split.

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Convertible preferred stock

'

'

2

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Convertible preferred stock

'

'

'

'

'

'

'

'

1

1.016998402

'

'

'

'

'

'

'

'

Initial public offering, shares issued

82,475,000

15,614,000

'

'

'

18,000,000

'

'

'

'

'

'

'

'

'

'

'

'

Initial public offering, price per share

'

'

'

'

'

$9

'

'

'

'

'

'

'

'

'

'

'

'

Total gross proceeds from initial public offering

'

'

'

'

'

$162,000,000

'

'

'

'

'

'

'

'

'

'

'

'

Aggregate net proceeds from initial public offering

'

'

'

'

'

145,800,000

'

'

'

'

'

'

'

'

'

'

'

'

Paid issuance costs

'

'

'

'

'

'

'

2.1

'

'

'

'

'

'

'

'

'

'

Overallotment option, Shares

'

'

'

'

'

'

2,700,000

'

'

'

'

'

'

'

'

'

'

'

Unpaid IPO costs

'

'

'

'

'

'

$1,600,000

'

'

'

'

'

'

'

'

'

'

'

Concentration Risk, benchmark percentage

'

'

'

'

10.00%

'

'

'

'

'

20.00%

24.00%

0.00%

13.00%

41.00%

45.00%

32.00%

43.00%

Number of largest customers

5

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Balance_Sheet_Components_Sched

Balance Sheet Components - Schedule of Inventory Components (Detail) (USD $)	Oct. 31, 2013	Jan. 31, 2013
In Thousands, unless otherwise specified
Inventory Disclosure [Abstract]	'	'
Raw materials	$11,202	$4,067
Finished goods	23,170	20,022
Inventory	$34,372	$24,089

Balance_Sheet_Components_Prope

Balance Sheet Components - Property and equipment, net (Detail) (USD $)	Oct. 31, 2013	Jan. 31, 2013
In Thousands, unless otherwise specified
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	$38,739	$29,103
Less: accumulated depreciation	-24,363	-16,005
Property and equipment, net	14,376	13,098
Laboratory Equipment [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	28,591	20,588
Computer Hardware and Software [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	9,706	7,620
Office Furniture [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	305	219
Leaseholds and Leasehold Improvements [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	$137	$676

Balance_Sheet_Components_Addit

Balance Sheet Components - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Property Plant And Equipment [Abstract]	'	'	'	'
Depreciation expense	$3.30	$1.60	$8.70	$6.80

Balance_Sheet_Components_Sched1

Balance Sheet Components - Schedule of Components of Accrued Liabilities (Detail) (USD $)	Oct. 31, 2013	Jan. 31, 2013
In Thousands, unless otherwise specified
Payables And Accruals [Abstract]	'	'
Compensation and benefits	$9,821	$6,915
Professional fees	3,113	2,855
Warranty	1,298	994
Other	4,563	4,369
Accrued liabilities	$18,795	$15,133

Fair_Value_Measurements_Summar

Fair Value Measurements - Summary of Financial Assets and Liabilities Measured at Fair Value (Detail) (USD $)	Oct. 31, 2013
In Thousands, unless otherwise specified
Cash equivalents:	'
Total cash equivalents	$70,766
Short term investments:	'
Total short term investments	51,753
Total assets measured at fair value	122,519
Money Market Funds [Member]	'
Cash equivalents:	'
Total cash equivalents	47,516
Commercial Paper [Member]	'
Cash equivalents:	'
Total cash equivalents	5,250
Short term investments:	'
Total short term investments	7,497
Treasury Bills [Member]	'
Cash equivalents:	'
Total cash equivalents	18,000
Corporate Debt Securities [Member]	'
Short term investments:	'
Total short term investments	4,830
U.S. Government and Agency Obligations [Member]	'
Short term investments:	'
Total short term investments	29,673
Municipal Obligations [Member]	'
Short term investments:	'
Total short term investments	9,753
Level 1 [Member]	'
Cash equivalents:	'
Total cash equivalents	47,516
Short term investments:	'
Total short term investments	'
Total assets measured at fair value	47,516
Level 1 [Member] | Money Market Funds [Member]	'
Cash equivalents:	'
Total cash equivalents	47,516
Level 1 [Member] | Commercial Paper [Member]	'
Cash equivalents:	'
Total cash equivalents	'
Short term investments:	'
Total short term investments	'
Level 1 [Member] | Treasury Bills [Member]	'
Cash equivalents:	'
Total cash equivalents	'
Level 1 [Member] | Corporate Debt Securities [Member]	'
Short term investments:	'
Total short term investments	'
Level 1 [Member] | U.S. Government and Agency Obligations [Member]	'
Short term investments:	'
Total short term investments	'
Level 1 [Member] | Municipal Obligations [Member]	'
Short term investments:	'
Total short term investments	'
Level 2 [Member]	'
Cash equivalents:	'
Total cash equivalents	23,250
Short term investments:	'
Total short term investments	51,753
Total assets measured at fair value	75,003
Level 2 [Member] | Commercial Paper [Member]	'
Cash equivalents:	'
Total cash equivalents	5,250
Short term investments:	'
Total short term investments	7,497
Level 2 [Member] | Treasury Bills [Member]	'
Cash equivalents:	'
Total cash equivalents	18,000
Level 2 [Member] | Corporate Debt Securities [Member]	'
Short term investments:	'
Total short term investments	4,830
Level 2 [Member] | U.S. Government and Agency Obligations [Member]	'
Short term investments:	'
Total short term investments	29,673
Level 2 [Member] | Municipal Obligations [Member]	'
Short term investments:	'
Total short term investments	9,753
Level 3 [Member]	'
Cash equivalents:	'
Total cash equivalents	'
Short term investments:	'
Total short term investments	'
Total assets measured at fair value	'
Level 3 [Member] | Money Market Funds [Member]	'
Cash equivalents:	'
Total cash equivalents	'
Level 3 [Member] | Commercial Paper [Member]	'
Cash equivalents:	'
Total cash equivalents	'
Short term investments:	'
Total short term investments	'
Level 3 [Member] | Treasury Bills [Member]	'
Cash equivalents:	'
Total cash equivalents	'
Level 3 [Member] | Corporate Debt Securities [Member]	'
Short term investments:	'
Total short term investments	'
Level 3 [Member] | U.S. Government and Agency Obligations [Member]	'
Short term investments:	'
Total short term investments	'
Level 3 [Member] | Municipal Obligations [Member]	'
Short term investments:	'
Total short term investments	'

Fair_Value_Measurements_Additi

Fair Value Measurements - Additional Information (Detail) (USD $)	Oct. 31, 2013	Jan. 31, 2013
Fair Value Disclosures [Abstract]	'	'
Financial assets measured at fair value on a recurring basis	'	$0
Financial liabilities measured at fair value on a recurring basis	'	0
Financial assets measured at fair value on a nonrecurring basis	0	0
Financial liabilities measured at fair value on a nonrecurring basis	$0	$0

Investments_Schedule_of_Invest

Investments - Schedule of Investments (Detail) (USD $)	Oct. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'
Amortized Cost	$51,743
Unrealized Gains	14
Unrealized Losses	-4
Estimate Fair Value	51,753
Corporate Debt Securities [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Amortized Cost	4,829
Unrealized Gains	2
Unrealized Losses	0
Estimate Fair Value	4,831
U.S. Government and Agency Obligations [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Amortized Cost	29,667
Unrealized Gains	9
Unrealized Losses	-4
Estimate Fair Value	29,672
Municipal Obligations [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Amortized Cost	9,750
Unrealized Gains	3
Unrealized Losses	0
Estimate Fair Value	9,753
Commercial Paper [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Amortized Cost	7,497
Unrealized Gains	0
Unrealized Losses	0
Estimate Fair Value	$7,497

Investments_Amortized_Cost_and

Investments - Amortized Cost and Fair Value of Investments by Contractual Years-to-Maturity (Detail) (USD $)	Oct. 31, 2013
In Thousands, unless otherwise specified
Amortized Cost And Fair Value Debt Securities [Abstract]	'
Amortized Cost, Due within one year	$42,709
Amortized Cost, Due within one to two years	9,034
Amortized Cost	51,743
Fair Value, Due within one year	42,717
Fair Value, Due within one to two years	9,036
Fair Value	$51,753

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Income Tax Disclosure [Abstract]	'	'	'	'
Income tax expenses	$18	$33	$45	$48
Unrecognized tax benefits	$0	'	$0	'

Equity_Award_Plans_Additional_

Equity Award Plans - Additional Information (Detail)

Oct. 31, 2013

Jan. 31, 2013

Oct. 31, 2012

Oct. 31, 2013

Oct. 31, 2012

Oct. 31, 2013

Oct. 31, 2013

Oct. 31, 2013

Oct. 31, 2013

Oct. 31, 2013

Oct. 31, 2013

Oct. 31, 2012

Oct. 31, 2013

Employee Stock Purchase Plan [Member]

Non-Employee Options [Member]

Non-Employee Options [Member]

Restricted Stock Units (RSUs) [Member]

2012 Stock Plan [Member]

2012 Stock Plan [Member]

Vesting Contingent On Liquidation Condition [Member]

Vesting Contingent On Service And Liquidation Condition [Member]

Minimum [Member]

Maximum [Member]

Maximum [Member]

Period

Restricted Stock Units (RSUs) [Member]

Restricted Stock Units (RSUs) [Member]

2012 Stock Plan [Member]

Employee Stock Purchase Plan [Member]

2012 Stock Plan [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

Share awards and options expiration period

'

'

'

'

'

'

'10 years

'

'

'

'

'

'

Share awards and options vesting period

'

'

'

'

'

'

'

'

'

'

'3 years

'

'4 years

Percentage of stock appreciation rights granted

'

'

'

'

'

'

'

'

'

'

100.00%

'

'

Shares authorized

'

'

'

'

'

'

7,500,000

7,500,000

'

'

'

'

'

Increase in shares authorized reserve, description

'

'

'

'

'

'

'

'The reserve will automatically increase on the first day of each fiscal year beginning on February 1, 2014 in an amount equal to the lesser of (i) 5% of the outstanding shares of common stock on the last day of the immediately preceding fiscal year, or (ii) another amount determined by the Board of Directors

'

'

'

'

'

Restricted stock units expected to vest

5,222,000

'

'

'

'

'

'

'

3,300,000

'

'

'

'

Restricted stock units vest date

15-Mar-14

'

'

'

'

15-Mar-14

'

'

'

'

'

'

'

Restricted stock units expected to vest

13,276,000

8,463,000

'

'

'

'

'

'

'

4,700,000

'

'

'

Share based compensation, Company granted option to purchase common stock

'

'

'

5,000

0

'

'

'

'

'

'

'

'

Share based compensation, Company granted option to purchase restricted stock

'

'

'

292,500

240,000

'

'

'

'

'

'

'

'

Employee Stock Purchase Plan, shares have been reserved for issuance under the 2012 Purchase Plan

'

'

1,000,000

'

'

'

'

'

'

'

'

'

'

Employee Stock Purchase Plan, Increase in number of shares available for issuance under the 2012 Purchase Plan

'

'

0.75%

'

'

'

'

'

'

'

'

'

'

Employee Stock Purchase Plan, maximum percentage of annual salary that an employee is permitted to utilize

'

'

15.00%

'

'

'

'

'

'

'

'

'

'

Employee Stock Purchase Plan, number Of Offering Periods

'

'

2

'

'

'

'

'

'

'

'

'

'

Employee Stock Purchase Plan, duration of offering period

'

'

'

'

'

'

'

'

'

'

'

'27 months

'

Employee Stock Purchase Plan, frequency of purchase date

'

'

'

'

'

'

'

'

'

'

'

'6 months

'

Employee Stock Purchase Plan, price of each shares issued is lower of the fair value per share of common stock

'

'

85.00%

'

'

'

'

'

'

'

'

'

'

Equity_Award_Plans_Summary_Sto

Equity Award Plans - Summary Stock Option Activity (Detail) (USD $)	9 Months Ended
In Thousands, except Share data, unless otherwise specified	Oct. 31, 2013	Jan. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Shares Available for Grant, beginning balance	4,858,000	'
Number of Options, RSUs granted	-6,208,000	'
Number of Options, RSUs cancelled/forfeited	1,295,000	'
Shares Available for Grant, ending balance	7,639,000	4,858,000
Number of Options, beginning balance	6,067,000	'
Number of Options, Additional shares authorized	'	'
Number of Options, Options granted	305,000	'
Number of Options, Options Exercised	-576,000	'
Number of Options, Options Forfeited	-364,000	'
Number of Options, Repurchased shares	'	'
Number of Options, ending balance	5,432,000	6,067,000
Number of Options, Options vested and expected to vest	5,222,000	'
Number of Options, Options exercisable	4,559,000	'
Weighted-average Exercise Price per Share, beginning balance	$0.94	'
Weighted-average Exercise Price per Share, Options granted	$8.79	'
Weighted-average Exercise Price per Share, Options exercised	$0.89	'
Weighted-average Exercise Price per Share, Options forfeited	$1.21	'
Weighted-average Exercise Price per Share, ending balance	$1.38	$0.94
Weighted-average Exercise Price per Share, Options vested and expected to vest	$1.30	'
Weighted-average Exercise Price per Share, Options exercisable	$0.89	'
Weighted-average Remaining Contractual Life, beginning balance	'7 years 6 months 4 days	'8 years 3 months 22 days
Weighted-average Remaining Contractual Life, ending balance	'7 years 6 months 4 days	'8 years 3 months 22 days
Weighted-average Remaining Contractual Life, Options vested and expected to vest	'7 years 6 months 4 days	'
Weighted-average Remaining Contractual Life, Options exercisable	'7 years 6 months 7 days	'
Aggregate Intrinsic Value, beginning balance	$42,096	'
Aggregate Intrinsic Value, ending balance	29,300	42,096
Aggregate Intrinsic Value, Options vested and expected to vest	28,463	'
Aggregate Intrinsic Value, Options exercisable	$26,267	'
Shares Available For Grant [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Shares Available for Grant, Additional shares authorized	7,500,000	'
Number of Options, Options granted	305,000	'
Shares Available for Grant, Options forfeited	364,000	'
Number of Options, Repurchased shares	97,000	'
Restricted Stock Units (RSUs) [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Number of Options, RSUs granted	'	'
Number of Options, RSUs cancelled/forfeited	'	'
Restricted Stock Units (RSUs) [Member] | Shares Available For Grant [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Number of Options, RSUs granted	-6,208,000	'
Number of Options, RSUs cancelled/forfeited	1,333,000	'

Equity_Award_Plans_Restricted_

Equity Award Plans - Restricted Stock Units (Detail)	9 Months Ended
	Oct. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Restricted stock units vest date	15-Mar-14
Restricted Stock Units (RSUs) [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Restricted stock units vest date	15-Mar-14
Restricted stock units, liquidity condition	'The liquidity condition is satisfied upon the occurrence of a qualifying event, defined as a change in control transaction or the earlier of (a) 181 days following the completion of an initial public offering or (b) the March 15th of the year following the completion of an initial public offering.
Minimum [Member] | Restricted Stock Units (RSUs) [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Restricted stock units vesting period	'3 years
Maximum [Member] | Restricted Stock Units (RSUs) [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Restricted stock units vesting period	'4 years

Equity_Award_Plans_Summary_of_

Equity Award Plans - Summary of Restricted Stock Units Activity (Detail) (USD $)	9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Oct. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Number of RSUs outstanding, beginning balance	8,463
Number of RSUs outstanding, granted	6,208
Number of RSUs outstanding, vested	-100
Number of RSUs outstanding, cancelled/forfeited	-1,295
Number of RSUs outstanding, ending balance	13,276
Weighted-average grant date fair value, beginning balance	$6.52
Weighted-average grant date fair value, granted	$8.19
Weighted-average grant date fair value, Vested	$6.11
Weighted-average grant date fair value, cancelled/forfeited	$7.06
Weighted-average grant date fair value, ending balance	$7.17
Aggregate intrinsic value, beginning balance	$63,469
Aggregate intrinsic value, ending balance	$88,285

StockBased_Compensation_Additi

Stock-Based Compensation - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Stock-based compensation not yet recognized	$56,400,000	'	$56,400,000	'
Stock-based compensation not yet recognized, expects to amortize in fiscal 2014	6,300,000	'	6,300,000	'
Stock-based compensation not yet recognized, expects to amortize in fiscal 2015	23,800,000	'	23,800,000	'
Stock-based compensation not yet recognized, expects to amortize in fiscal 2016	16,000,000	'	16,000,000	'
Stock-based compensation not yet recognized, expects to amortize in fiscal 2017	'	'	10,300,000	'
Capitalized stock-based compensation expense	0	'	0	'
Stock-based compensation expense	8,255,000	4,113,000	18,199,000	12,711,000
Non-Employee Options [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Options issued	225,000	'	'	'
Stock-based compensation expense	$2,000,000	'	'	'

StockBased_Compensation_Schedu

Stock-Based Compensation - Schedule of Assumptions to Estimate Fair Value of Options and Purchase Rights under ESPP (Detail)	3 Months Ended	9 Months Ended
	Oct. 31, 2013	Oct. 31, 2013
Employee Stock Options [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Expected life (in years)	'4 years 7 months 6 days	'4 years 7 months 6 days
Expected volatility	50.20%	50.20%
Risk-free interest rate	1.50%	1.50%
Dividend yield	0.00%	0.00%
Employee Stock Purchase Plan [Member]	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Expected life (in years)	'2 years 2 months 5 days	'2 years 2 months 5 days
Expected volatility	45.60%	45.60%
Risk-free interest rate	0.12%	0.12%
Dividend yield	0.00%	0.00%

Commitments_and_Contingencies_

Commitments and Contingencies - Additional Information (Detail) (USD $)	Oct. 31, 2013	Jan. 31, 2013	Aug. 26, 2013
	Indemnification Agreement [Member]	Indemnification Agreement [Member]	Savvian Litigation [Member]
Loss Contingencies [Line Items]	'	'	'
Offering fees, payment sought	'	'	$10
Liabilities recorded for indemnification agreements	$0	$0	'

RelatedParty_Transactions_Addi

Related-Party Transactions - Additional Information (Detail) (USD $)

Oct. 31, 2013

Jan. 31, 2013

Jul. 31, 2013

Oct. 31, 2013

Oct. 31, 2012

Oct. 31, 2013

Oct. 31, 2012

Jun. 30, 2011

Oct. 31, 2013

Oct. 31, 2012

Oct. 31, 2013

Oct. 31, 2012

Jul. 31, 2013

Oct. 31, 2013

Oct. 31, 2013

Jul. 31, 2013

Oct. 31, 2013

Oct. 31, 2013

Share data in Thousands, unless otherwise specified

Toshiba Corporation [Member]

Toshiba Corporation [Member]

Toshiba Corporation [Member]

Toshiba Corporation [Member]

Toshiba Corporation [Member]

Toshiba Corporation [Member]

Toshiba Corporation [Member]

Toshiba Corporation [Member]

Toshiba Corporation [Member]

Toshiba Corporation [Member]

Toshiba Corporation [Member]

Toshiba Corporation [Member]

Toshiba Corporation [Member]

Toshiba Corporation [Member]

Toshiba Corporation [Member]

Toshiba Corporation [Member]

Flash Memory [Member]

Flash Memory [Member]

Flash Memory [Member]

Flash Memory [Member]

Flash Memory [Member]

Development of PCIe Cards [Member]

Development of PCIe Cards [Member]

Development of PCIe Cards [Member]

Sample PCIe Cards [Member]

Sample PCIe Cards [Member]

Sample PCIe Cards [Member]

Related Party Transaction [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock outstanding

82,475

15,614

'

9,200

'

9,200

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of common stock outstanding

'

'

'

11.00%

'

11.00%

'

'

'

'

'

'

'

'

'

'

'

'

Sales agreement purchase percentage

'

'

'

'

'

'

'

70.00%

'

'

'

'

'

'

'

'

'

'

Prepayment received from related party

'

'

$16,000,000

'

'

'

'

'

'

'

'

'

$8,000,000

'

'

$8,000,000

'

'

Revenue recognized related to development

'

'

'

'

'

'

'

'

'

'

'

'

'

3,000,000

3,000,000

'

1,400,000

1,400,000

Remaining prepayment is classified as short-term deferred revenue

24,236,000

6,916,000

'

11,600,000

'

11,600,000

'

'

'

'

'

'

'

'

'

'

'

'

Discount on OEM prices

'

'

'

'

'

20.00%

'

'

'

'

'

'

'

'

'

'

'

'

Recognized incremental cost

'

'

'

700,000

'

700,000

'

'

'

'

'

'

'

'

'

'

'

'

Revenue, related party sales

'

'

'

1,200,000

1,900,000

3,500,000

3,200,000

'

'

'

'

'

'

'

'

'

'

'

Purchases from related party

'

'

'

'

'

'

'

'

$7,800,000

$6,500,000

$21,100,000

$21,300,000

'

'

'

'

'

'

Segment_Information_Additional

Segment Information - Additional Information (Detail)	9 Months Ended
	Oct. 31, 2013
	Segment
Segment Reporting [Abstract]	'
Number of reportable segment	1
Number of operating segment	1

Segment_Information_Schedule_o

Segment Information - Schedule of Revenue and Property and Equipment by Geographic Area (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012	Jan. 31, 2013
Segment Reporting Information [Line Items]	'	'	'	'	'
Total Revenue	$28,306	$20,596	$79,609	$50,898	'
Property and equipment, net	14,376	'	14,376	'	13,098
United States [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total Revenue	16,432	15,747	52,776	38,467	'
Property and equipment, net	13,924	'	13,924	'	12,426
Other Americas [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total Revenue	195	340	404	349	'
Americas [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total Revenue	16,627	16,087	53,180	38,816	'
United Kingdom [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total Revenue	1,027	1,570	2,853	3,825	'
Other Europe [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total Revenue	3,063	1,533	7,071	1,877	'
Europe [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total Revenue	4,090	3,103	9,924	5,702	'
Property and equipment, net	446	'	446	'	672
Asia Pacific [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total Revenue	7,589	1,406	16,505	6,380	'
Property and equipment, net	$6	'	$6	'	'

Net_Loss_Per_Share_Schedule_of

Net Loss Per Share - Schedule of Computation of Historical Basic and Diluted Net Loss Per Share (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Numerator:	'	'	'	'
Net loss:	($34,113)	($25,399)	($93,285)	($73,694)
Denominator:	'	'	'	'
Weighted average common shares outstanding	40,491	15,471	24,042	15,397
Less: Weighted average unvested common shares subject to repurchase	129	1,275	233	2,181
Weighted average shares used to compute net loss per share of common stock, basic and diluted	40,362	14,196	23,809	13,216
Net loss per share of common stock, basic and diluted	($0.85)	($1.79)	($3.92)	($5.58)

Net_Loss_Per_Share_Schedule_of1

Net Loss Per Share - Schedule of Common Stock Equivalents Excluded from Computation of Diluted Net Loss Per Share (Detail)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Total common stock equivalents excluded from computation of diluted net loss per share	18,903	60,679	18,903	60,679
Convertible Preferred Stock [Member]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Total common stock equivalents excluded from computation of diluted net loss per share	'	45,190	'	45,190
Common Stock Subject to Repurchase [Member]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Total common stock equivalents excluded from computation of diluted net loss per share	111	553	111	553
Warrants Related to Common Stock [Member]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Total common stock equivalents excluded from computation of diluted net loss per share	84	'	84	'
Shares Subject to Outstanding Common Stock Options and Restricted Stock Units [Member]	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Total common stock equivalents excluded from computation of diluted net loss per share	18,708	14,936	18,708	14,936

Debt_and_Line_of_Credit_Additi

Debt and Line of Credit - Additional Information (Detail) (USD $)	9 Months Ended				9 Months Ended		9 Months Ended		9 Months Ended
	Oct. 31, 2013	Oct. 02, 2013	Aug. 31, 2013	Jun. 30, 2013	Oct. 31, 2013	31-May-13	Oct. 31, 2013	Oct. 31, 2013	Oct. 31, 2013
	Line of Credit [Member]	Convertible Promissory Notes [Member]	Convertible Promissory Notes [Member]	Convertible Promissory Notes [Member]	Triple Point Capital LLC [Member]	Triple Point Capital LLC [Member]	Minimum [Member]	Maximum [Member]	Maximum [Member]
					Secured Debt [Member]	Secured Debt [Member]	Triple Point Capital LLC [Member]	Line of Credit [Member]	Triple Point Capital LLC [Member]
							Secured Debt [Member]		Secured Debt [Member]
Debt Instrument [Line Items]	'	'	'	'	'	'	'	'	'
Debt facility, maximum borrowing capacity	$7,500,000	'	'	'	'	$50,000,000	'	'	'
Debt facility, collateral description	'	'	'	'	'The facility has first secured interest in substantially all of the Company's assets and intellectual property other than $7.5 million of accounts receivable.	'	'	'	'
Debt facility period	'	'	'	'	'1 year	'	'	'	'
Borrowing options, expiration period	'2 years	'	'	'	'	'	'3 months	'	'5 years
Debt instrument, interest rate, minimum	'	'	'	'	7.00%	'	'	'	'
Debt instrument, interest rate, maximum	'	'	'	'	13.50%	'	'	'	'
Debt instrument, interest rate at period end	'	'	'	'	'	'	0.50%	'	14.00%
Line of credit, amount outstanding	0	'	'	'	'	'	'	'	'
Line of credit, borrowing capacity description	'The Company can borrow up to 80% of its current U.S.-based receivables, or $7.5 million, whichever is lower.	'	'	'	'	'	'	'	'
Percentage of receivable	'	'	'	'	'	'	'	80.00%	'
Line of credit facility, interest rate spread	1.00%	'	'	'	'	'	'	'	'
Line of credit facility, interest rate at period end	4.25%	'	'	'	'	'	'	'	'
Convertible promissory notes, issued amount	'	'	$2,700,000	$2,500,000	'	'	'	'	'
Convertible promissory notes, interest rate	'	'	10.00%	'	'	'	'	'	'
Accrued interest converted into common stock, price per share	'	$9	$9	'	'	'	'	'	'