Violin Memory (VMEMQ) 10-K 16 Apr 14 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
	Jan. 31, 2014	Mar. 31, 2014	Oct. 02, 2013
Document And Entity Information [Abstract]	'	'	'
Document Type	'10-K	'	'
Amendment Flag	'false	'	'
Document Period End Date	31-Jan-14	'	'
Document Fiscal Year Focus	'2014	'	'
Document Fiscal Period Focus	'FY	'	'
Trading Symbol	'VMEM	'	'
Entity Registrant Name	'Violin Memory Inc	'	'
Entity Central Index Key	'0001407190	'	'
Current Fiscal Year End Date	'--01-31	'	'
Entity Well-known Seasoned Issuer	'No	'	'
Entity Current Reporting Status	'Yes	'	'
Entity Voluntary Filers	'No	'	'
Entity Filer Category	'Non-accelerated Filer	'	'
Entity Common Stock, Shares Outstanding	'	85,164,309	'
Entity Public Float	'	'	$480,855,273

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Jan. 31, 2014	Jan. 31, 2013
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$40,273	$17,378
Short-term investments	59,106	'
Accounts receivable, net (including amounts due from a related party of $565 and $1,881 as of January 31, 2014 and 2013, respectively)	21,055	22,012
Inventory	39,653	24,089
Other current assets	6,154	6,020
Total current assets	166,241	69,499
Property and equipment, net	13,653	13,098
Other assets	4,769	5,553
Total assets	184,663	88,150
Current liabilities:	'	'
Accounts payable (including amounts due to a related party of $12,208 and $6,808 as of January 31, 2014 and 2013, respectively)	18,389	15,275
Accrued liabilities (including amounts due to a related party of $6,875 and $0 as of January 31, 2014 and 2013, respectively)	37,315	15,133
Deferred revenue (including amounts received from a related party of $89 and $229 as of January 31, 2014 and 2013, respectively)	13,480	6,916
Total current liabilities	69,184	37,324
Long-term deferred revenue (including amounts received from a related party of $43 and $0 as of January 31, 2014 and 2013, respectively)	11,755	6,102
Total liabilities	80,939	43,426
Commitments and contingencies (Note 9)	'	'
Stockholders' equity:	'	'
Preferred stock, $0.0001 par value, 10,000 and 0 shares authorized as of January 31, 2014 and 2013, respectively; no shares outstanding	0	0
Convertible preferred stock, $0.0001 par value, 0 and 111,000 shares authorized as of January 31, 2014 and 2013, respectively; and 0 and 91,570 shares issued and outstanding as of January 31, 2014 and 2013, respectively	'	9
Common stock, $0.0001 par value, 1,000,000 and 250,000 shares authorized as of January 31, 2014 and 2013, respectively; 83,057 and 15,614 shares issued and outstanding as of January 31, 2014 and 2013, respectively	8	4
Additional paid-in capital	456,223	247,531
Accumulated other comprehensive income (loss)	115	-7
Accumulated deficit	-352,622	-202,813
Total stockholders' equity	103,724	44,724
Total liabilities and stockholders' equity	$184,663	$88,150

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Jan. 31, 2014	Jan. 31, 2013
In Thousands, except Share data, unless otherwise specified
Accounts receivables, amounts due from a related party	$565	$1,881
Accounts payable, amounts due to a related party	12,208	6,808
Accrued liabilities, amounts due to a related party	6,875	0
Deferred revenue from related party	89	229
Long-term deferred revenue from related party	$43	$0
Preferred stock, par value	$0.00	$0.00
Preferred stock, Shares Authorized	10,000,000	0
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	83,057,000	15,614,000
Common stock, shares outstanding	83,057,000	15,614,000
Convertible Preferred Stock [Member]	'	'
Preferred stock, par value	$0.00	$0.00
Preferred stock, Shares Authorized	0	111,000,000
Preferred stock, shares issued	0	91,570,000
Preferred stock, shares outstanding	0	91,570,000

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jan. 31, 2014		Jan. 31, 2013		Jan. 31, 2012
Revenue:	'		'		'
Product revenue (including related party sales of $7,128, $5,242 and $41 for the years ended January 31, 2014, 2013 and 2012, respectively)	$88,321		$69,584		$52,541
Service revenue (including related party sales of $6,360, $332 and $0 for the years ended January 31, 2014, 2013 and 2012, respectively)	19,335		4,214		1,347
Total revenue	107,656		73,798		53,888
Cost of revenue:	'		'		'
Cost of product revenue (including related party purchases of $38,239 $27,510 and $28,610 for the years ended January 31, 2014, 2013 and 2012, respectively)	47,773	[1]	38,180	[1]	38,110	[1]
PCIe card inventory provision	9,154		0		0
Cost of service revenue	7,846	[1]	4,474	[1]	1,156	[1]
Total cost of revenue	64,773		42,654		39,266
Gross profit	42,883		31,144		14,622
Operating expenses :	'		'		'
Sales and marketing	81,104	[1]	61,094	[1]	21,493	[1]
Research and development	73,743	[1]	57,840	[1]	26,641	[1]
General and administrative	29,622	[1]	21,105	[1]	6,222	[1]
Restructuring and transition charges	4,869		0		0
Litigation settlement	350		0		2,100
Total operating expenses	189,688		140,039		56,456
Loss from operations	-146,805		-108,895		-41,834
Other income (expense), net	-1,389		-79		89
Interest expense	-1,539		-31		-3,033
Loss before income taxes	-149,733		-109,005		-44,778
Income taxes	76		97		7
Net loss	($149,809)		($109,102)		($44,785)
Net loss per share of common stock, basic and diluted	($3.88)		($8.01)		($4.77)
Shares used to compute net loss per share of common stock, basic and diluted	38,591		13,624		9,396
[1]	Includes stock-based compensation expense as follows (Note 7): Cost of product revenue $ 100 $ 150 $ 15 Cost of service revenue 889 474 4 Sales and marketing 10,344 4,061 299 Research and development 6,900 3,228 236 General and administrative 18,166 10,010 492 $ 36,399 $ 17,923 $ 1,046

Consolidated_Statements_of_Ope1

Consolidated Statements of Operations (Parenthetical) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Cost of product revenue, related party purchases	$38,239	$27,510	$28,610
Stock-based compensation expense	36,399	17,923	1,046
Product Revenue [Member]	'	'	'
Revenue from related party sales	7,128	5,242	41
Services Revenues [Member]	'	'	'
Revenue from related party sales	6,360	332	0
Cost of Product Revenue [Member]	'	'	'
Stock-based compensation expense	100	150	15
Cost of Service Revenue [Member]	'	'	'
Stock-based compensation expense	889	474	4
Sales and Marketing [Member]	'	'	'
Stock-based compensation expense	10,344	4,061	299
Research and Development [Member]	'	'	'
Stock-based compensation expense	6,900	3,228	236
General and Administrative [Member]	'	'	'
Stock-based compensation expense	$18,166	$10,010	$492

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Loss (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Statement Of Income And Comprehensive Income [Abstract]	'	'	'
Net loss	($149,809)	($109,102)	($44,785)
Foreign currency translation adjustments, net of tax	111	81	-88
Unrealized holding gains on investments, net of tax	11	'	'
Comprehensive loss	($149,687)	($109,021)	($44,873)

Consolidated_Statements_of_Sto

Consolidated Statements of Stockholders' Equity (Deficit) (USD $)

Total

Series B Convertible Preferred Stock [Member]

Series C Convertible Preferred Stock [Member]

Series D Preferred Stock [Member]

IPO [Member]

Convertible Preferred Stock [Member]

Convertible Preferred Stock [Member]

Convertible Preferred Stock [Member]

Convertible Preferred Stock [Member]

Convertible Preferred Stock [Member]

Common Stock [Member]

Common Stock [Member]

Common Stock [Member]

Common Stock [Member]

Common Stock [Member]

Additional Paid-in Capital [Member]

Additional Paid-in Capital [Member]

Additional Paid-in Capital [Member]

Additional Paid-in Capital [Member]

Additional Paid-in Capital [Member]

Other Comprehensive Loss [Member]

Other Comprehensive Loss [Member]

Other Comprehensive Loss [Member]

Other Comprehensive Loss [Member]

Accumulated Deficit [Member]

Accumulated Deficit [Member]

Accumulated Deficit [Member]

Accumulated Deficit [Member]

In Thousands, except Share data

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

Series B Convertible Preferred Stock [Member]

Series C Convertible Preferred Stock [Member]

Series D Preferred Stock [Member]

IPO [Member]

USD ($)

Series B Convertible Preferred Stock [Member]

Series C Convertible Preferred Stock [Member]

Series D Preferred Stock [Member]

IPO [Member]

USD ($)

Series B Convertible Preferred Stock [Member]

Series C Convertible Preferred Stock [Member]

Series D Preferred Stock [Member]

IPO [Member]

USD ($)

Series B Convertible Preferred Stock [Member]

Series C Convertible Preferred Stock [Member]

Series D Preferred Stock [Member]

USD ($)

Series B Convertible Preferred Stock [Member]

Series C Convertible Preferred Stock [Member]

Series D Preferred Stock [Member]

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

Beginning balance at Jan. 31, 2011

($2,572)

'

'

'

'

$4

'

'

'

'

$4

'

'

'

'

$46,346

'

'

'

'

'

'

'

'

($48,926)

'

'

'

Beginning balance, shares at Jan. 31, 2011

'

'

'

'

'

44,153,000

'

'

'

'

14,334,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Issuance of stock

'

36,436

53,835

'

'

'

2

2

'

'

'

'

'

'

'

'

36,434

53,833

'

'

'

'

'

'

'

'

'

'

Issuance of stock, shares

'

'

'

'

'

'

18,264,000

13,525,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Conversion of convertible notes into common stock

0

14,045

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Conversion of convertible notes into common stock, shares

'

8,261,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock warrants

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Issuance of common stock upon exercise of stock options

186

'

'

'

'

'

'

'

'

'

'

'

'

'

'

186

'

'

'

'

'

'

'

'

'

'

'

'

Issuance of common stock upon exercise of stock options, shares

1,009,000

'

'

'

'

'

'

'

'

'

864,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Issuance of common stock for settlement of RSUs

93

'

'

'

'

'

'

'

'

'

'

'

'

'

'

93

'

'

'

'

'

'

'

'

'

'

'

'

Issuance of common stock for settlement of RSUs, shares

'

'

'

'

'

'

'

'

'

'

145,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Repurchase of unvested portion of common stock, shares

'

'

'

'

'

'

'

'

'

'

-19,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock-based compensation

1,046

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,046

'

'

'

'

'

'

'

'

'

'

'

'

Translation adjustment

-88

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-88

'

'

'

'

'

'

'

Net loss

-44,785

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-44,785

'

'

'

Ending balance at Jan. 31, 2012

44,151

'

'

'

'

8

'

'

'

'

4

'

'

'

'

137,938

'

'

'

'

-88

'

'

'

-93,711

'

'

'

Ending balance, shares at Jan. 31, 2012

'

'

'

'

'

75,942,000

'

'

'

'

15,324,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Issuance of stock

'

'

'

89,728

'

'

'

'

1

'

'

'

'

'

'

'

'

'

89,727

'

'

'

'

'

'

'

'

'

Issuance of stock, shares

'

'

'

'

'

'

'

'

15,428,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Conversion of convertible notes into common stock

0

'

'

9,415

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Issuance of Series D convertible preferred stock in connection with a litigation settlement at $7.00 per share

'

'

'

1,400

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,400

'

'

'

'

'

'

'

'

'

Conversion of convertible notes into common stock, shares

'

'

'

1,569,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Issuance of Series D convertible preferred stock in connection with a litigation settlement at $7.00 per share

'

'

'

'

'

'

'

'

200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock warrants

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Issuance of common stock upon exercise of stock options

543

'

'

'

'

'

'

'

'

'

'

'

'

'

'

543

'

'

'

'

'

'

'

'

'

'

'

'

Issuance of common stock upon exercise of stock options, shares

353,000

'

'

'

'

'

'

'

'

'

353,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Repurchase of unvested portion of common stock, shares

'

'

'

'

'

'

'

'

'

'

-63,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock-based compensation

17,923

'

'

'

'

'

'

'

'

'

'

'

'

'

'

17,923

'

'

'

'

'

'

'

'

'

'

'

'

Translation adjustment

81

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

81

'

'

'

'

'

'

'

Net loss

-109,102

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-109,102

'

'

'

Ending balance at Jan. 31, 2013

44,724

'

'

'

'

9

'

'

'

'

4

'

'

'

'

247,531

'

'

'

'

-7

'

'

'

-202,813

'

'

'

Ending balance, shares at Jan. 31, 2013

'

'

'

'

'

91,570,000

'

'

'

'

15,614,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Conversion of convertible preferred stock into common stock

0

'

'

'

'

-10

'

'

'

'

2

'

'

'

'

8

'

'

'

'

'

'

'

'

'

'

'

'

Issuance of stock

'

'

'

20,953

145,820

'

'

'

1

'

'

'

'

'

2

'

'

'

20,952

145,818

'

'

'

'

'

'

'

'

Conversion of convertible preferred stock into common stock, shares

'

'

'

'

'

-95,145,000

'

'

'

'

47,735,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Issuance of stock, shares

'

'

'

'

'

'

'

'

3,575,000

'

'

'

'

'

18,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Conversion of convertible notes into common stock

5,203

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5,203

'

'

'

'

'

'

'

'

'

'

'

'

Conversion of convertible notes into common stock, shares

'

'

'

'

'

'

'

'

'

'

585,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock warrants

309

'

'

'

'

'

'

'

'

'

'

'

'

'

'

309

'

'

'

'

'

'

'

'

'

'

'

'

Issuance of common stock upon exercise of stock options

732

'

'

'

'

'

'

'

'

'

'

'

'

'

'

732

'

'

'

'

'

'

'

'

'

'

'

'

Issuance of common stock upon exercise of stock options, shares

1,008,000

'

'

'

'

'

'

'

'

'

1,008,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Issuance of common stock for settlement of RSUs, shares

'

'

'

'

'

'

'

'

'

'

250,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Shares withheld related to net share settlement of RSUs

-341

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-341

'

'

'

'

'

'

'

'

'

'

'

'

Shares withheld related to net share settlement of RSUs, shares

'

'

'

'

'

'

'

'

'

'

-38,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Repurchase of unvested portion of common stock, value

-388

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-388

'

'

'

'

'

'

'

'

'

'

'

'

Repurchase of unvested portion of common stock, shares

'

'

'

'

'

'

'

'

'

'

-97,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock-based compensation

36,399

'

'

'

'

'

'

'

'

'

'

'

'

'

'

36,399

'

'

'

'

'

'

'

'

'

'

'

'

Translation adjustment

111

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

111

'

'

'

'

'

'

'

Unrealized gain on investments

11

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

11

'

'

'

'

'

'

'

Net loss

-149,809

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-149,809

'

'

'

Ending balance at Jan. 31, 2014

$103,724

'

'

'

'

'

'

'

'

'

$8

'

'

'

'

$456,223

'

'

'

'

$115

'

'

'

($352,622)

'

'

'

Ending balance, shares at Jan. 31, 2014

'

'

'

'

'

'

'

'

'

'

83,057,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Consolidated_Statements_of_Sto1

Consolidated Statements of Stockholders' Equity (Deficit) (Parenthetical) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jan. 31, 2012	Jan. 31, 2012	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2014	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013
	Series B Convertible Preferred Stock [Member]	Series C Convertible Preferred Stock [Member]	Series D Preferred Stock [Member]	Series D Preferred Stock [Member]	IPO [Member]	Minimum [Member]	Minimum [Member]	Maximum [Member]	Maximum [Member]
						Series B Convertible Preferred Stock [Member]	Series D Preferred Stock [Member]	Series B Convertible Preferred Stock [Member]	Series D Preferred Stock [Member]
Issuance of convertible preferred stock, price per share	'	$4	$6	$7	'	$1.70	$6	$2	$7
Common stock, issuance costs	$94	$265	$498	$3,200	$16,180	'	'	'	'

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Cash flows from operating activities:	'	'	'
Net loss	($149,809)	($109,102)	($44,785)
Adjustments to reconcile net loss to net cash used in operating activities:	'	'	'
Depreciation and amortization	12,552	9,013	5,064
Loss on disposal of equipment	0	0	53
Provision for excess and obsolete inventory	1,819	1,052	5,826
Allowance for doubtful accounts	0	357	0
Impairment of assets	1,965	0	0
PCIe card inventory provision	9,154	0	0
Accretion of interest cost	175	0	0
Loss on extinguishment of debt	0	31	2,921
Stock-based compensation	36,399	17,923	1,046
Accounts receivable	957	-6,711	-15,050
Inventory	-24,339	-6,538	-21,066
Other assets	-932	733	-3,002
Accounts payable	2,881	-1,930	9,168
Accrued liabilities	15,413	7,540	8,388
Deferred revenue	12,217	10,722	1,394
Net cash used in operating activities	-81,548	-76,910	-50,043
Cash flows from investing activities:	'	'	'
Purchase of property and equipment	-9,300	-10,554	-5,007
Purchase of cost method investments	-604	-4,986	0
Purchase of investments	-66,224	0	0
Maturity of investments	7,129	0	0
Net cash used in investing activities	-68,999	-15,540	-5,007
Cash flows from financing activities:	'	'	'
Proceeds from issuance of convertible notes	5,160	2,698	682
Proceeds from issuance of convertible preferred stock, net of issuance costs	20,953	86,316	70,453
Proceeds from debt and line of credit, net of issuance costs	20,078	0	0
Proceeds from issuance of common stock	0	0	17
Repayment of debt and lines of credit	-20,500	0	0
Proceeds from initial public offering, net of issuance costs	147,870	-2,050	0
Proceeds from exercise of common stock options	610	260	420
Repurchase of stock	-388	0	0
Taxes paid related to net share settlement of equity awards	-341	0	0
Net cash provided by financing activities	173,442	87,224	71,572
Net increase (decrease) in cash and cash equivalents	22,895	-5,226	16,522
Cash and cash equivalents at beginning of year	17,378	22,604	6,082
Cash and cash equivalents at end of year	40,273	17,378	22,604
Supplemental disclosure of other cash flow information:	'	'	'
Taxes paid	47	10	1
Interest paid	972	0	0
Supplemental disclosure of non-cash investing and financing activities:	'	'	'
Conversion of convertible notes to common stock	5,203	0	0
Conversion of convertible preferred stock to common stock	10	0	0
Conversion of warrant to purchase convertible preferred stock to common stock	309	0	0
Transfer of inventory to property and equipment	4,418	3,574	7,185
Conversion of notes payable and accrued interest to convertible preferred stock	0	3,415	14,045
Issuance of Series B convertible preferred stock in exchange for note receivable	0	0	2,850
Settlement of loan receivable from officer in lieu of bonus payment	0	1,000	0
Issuance of Series D convertible preferred stock in connection with litigation	0	1,400	0
Vesting of early stock option exercises	$122	$280	$0

Organization_and_Summary_of_Si

Organization and Summary of Significant Accounting Policies	12 Months Ended
	Jan. 31, 2014
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 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.
	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 paid by the Company, the aggregate net proceeds to the Company totaled $145.8 million.
	Basis of Presentation and Consolidation
	We prepared the consolidated financial statements in accordance with U.S. generally accepted accounting principles (GAAP). The consolidated financial statements include the accounts of Violin Memory, Inc. and its wholly owned subsidiaries. All intercompany balances and transactions have been eliminated.
	Foreign Currency Transactions and Remeasurement
	The local currency is the functional currency for each of the Company’s subsidiaries. Assets and liabilities are translated into U.S. dollars at exchange rates in effect at the balance sheet date. Income and expense items are translated at average exchange rates the respective period.
	Gains and losses from foreign currency transactions are included in other income (expense), net. Foreign currency translation adjustments are included in other comprehensive loss.
	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.
	Concentrations of Market, Credit Risk, Significant Customers and Manufacturing
	The Company participates in the business of developing and manufacturing scalable flash memory arrays and believes that changes in any of the following areas could have a material adverse effect on the Company’s future financial position, results of operations or cash flows: advances and trends in new technologies and industry standards; competitive pressures in the form of new products or price reduction on current products; changes in the overall demand for products offered by the Company; changes in certain strategic relationships or customer relationships; litigation or claims against the Company based on intellectual property, patent, product, regulatory or other factors; and risks associated with changes in domestic and international economic and international and/or political conditions or regulations.
	Financial instruments that potentially subject the Company to concentrations of credit risk primarily consist of cash, cash equivalents, investments and accounts receivable. The Company places its cash and cash equivalents and investments with high credit quality financial institutions which the Company believes are creditworthy. Deposits may exceed the insured limits provided on them.
	The Company generally requires no collateral from its customers. The Company mitigates its credit risk with associated with its accounts receivable by performing ongoing credit evaluations of its customers and establishes an allowance for doubtful accounts for estimated losses based on management’s assessment of the collectability of customer accounts.
	Customers that represented more than 10% of total revenue and gross accounts receivable are as follows:
			Year Ended January 31,
			2014			2013			2012
	Percent of revenue:
	Toshiba (Note 10)			12	%		*	%		*	%
	Hewlett-Packard				*		*			65
	CompSec				*		12			*
			January 31,
			2014			2013
	Percent of gross accounts receivable:
	Commtech Innovative Solutions			27	%		*	%
	Avnet, Inc.			15			*
	Super Micro Computer			*			16
	Daymark Solutions			*			12
		*	Less than 10%.
	The Company sells to a limited number of large systems vendors, resellers and end-customers and, as a result, maintains individually significant receivable balances with such customers. The Company’s systems vendor customers and certain large resellers tend to be well-capitalized, multi-national companies, while other customers may not be as well capitalized. Sales of products to large systems vendors and resellers are expected to account for a majority of the Company’s revenues in the foreseeable future, and the Company’s financial results will depend in part upon the success of these customers. The composition of the Company’s major customer base may change as the market demand for its products changes, and the Company expects this variability will continue in the future. The loss of, or a significant reduction in purchases by, any of the major customers may harm the Company’s business, financial condition and results of operations.
	The Company relies on a limited number of suppliers for its contract manufacturing and certain raw material components. The Company believes that other vendors would be able to provide similar products and services; however, the qualification of such vendors may require substantial start-up time. In order to mitigate any adverse impacts from disruption of supply, the Company attempts to maintain an adequate supply of critical single-sourced raw materials.
	Cash and Cash Equivalents
	Cash consists of deposits with financial institutions. The Company considers all highly liquid investments with a maturity of three months or less when purchased to be cash equivalents. Cash equivalents consist of money market funds, which are readily convertible into cash and are stated at cost, which approximates fair market value. Cash and cash equivalents were $40.3 million as of January 31, 2014. The Company did not hold any cash equivalents as of January 31, 2013.
	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 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 January 31, 2014, 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.
	Fair Value Measurements and Disclosures
	The Company records its financial assets and liabilities at fair value. The accounting guidance for fair value provides a framework for measuring fair value, clarifies the definition of fair value, and expands disclosures regarding fair value measurements. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the reporting date. The accounting guidance establishes a three-tiered hierarchy, which prioritizes the inputs used in the valuation methodologies in measuring fair value:
	Level 1 – Quoted prices in active markets for identical assets or liabilities.
	Level 2 – Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.
	Level 3 – Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.
	The Company recognizes transfers among Level 1, Level 2 and Level 3 classifications as of the actual date of the events or change in circumstances that caused the transfers.
	The Company’s financial instruments, including cash equivalents, accounts receivable, accounts payable and accrued liabilities have carrying amounts which approximate fair value due to the short-term maturity of these instruments.
	Accounts Receivable
	Trade accounts receivable are recorded at the invoiced amount and do not bear interest. The Company maintains an allowance for doubtful accounts for estimated losses inherent in its accounts receivable portfolio. In establishing the required allowance, management considers expected losses after taking into account current market conditions, customers’ financial condition, current receivable aging and current payment patterns. Account balances are charged off against the allowance after all means of collection have been exhausted and the potential for recovery is considered remote. As of January 31, 2014 and 2013, the Company’s allowance for doubtful accounts was insignificant.
	Inventory
	Inventory is stated at the lower of cost or market. Cost is determined using the first-in, first-out method (FIFO method). The Company periodically assesses the recoverability of all inventory, including raw materials and finished goods to determine whether adjustments are required to record inventory at the lower of cost or market. Inventory that the Company determines to be obsolete or in excess of forecasted usage is reduced to its estimated realizable value based on assumptions about future and current market conditions. In the case of inventory which has been written down below cost through the use of a reserve, such reduced amount is considered the cost for subsequent accounting purposes.
	Revenue Recognition
	The Company derives revenue primarily from sales of its flash memory arrays, flash memory cards, software and related support and development services. Revenue is recognized when persuasive evidence of an arrangement exists, delivery has occurred or services have been rendered, the price is fixed and determinable and collectability is reasonably assured. Evidence of an arrangement exists when there is a customer contract or purchase order. The Company considers delivery complete when title and risk of loss transfer to the customer, which is generally upon shipment, but no later than physical receipt by the customer.
	The Company sells its products and support services directly to end-customers, systems vendors and resellers. The Company currently does not provide price protection, rebates or other sales incentives to customers. The Company generally does not allow a right of return to its customers, including resellers.
	The Company’s multiple-element arrangements typically include two elements: hardware, which includes embedded software, and support services. Beginning in the second quarter of fiscal 2014, following introduction of the Violin Symphony Management Software Suite, the Company’s multiple-element arrangements also may include software elements. The Company has determined that its hardware and the embedded software are considered a single unit of accounting, because the hardware and software individually do not have standalone value and are not sold separately. Standalone software and support services are each considered a separate unit of accounting as they can be sold separately and have standalone value.
	When more than one element, such as hardware, software and services, are contained in a single arrangement, the Company first allocates arrangement consideration to the software deliverables as a group and non-software deliverables based on the relative selling price method. The Company’s appliance products, embedded software, and certain other services are considered to be non-software deliverables in such arrangements. The Company allocates revenue within the software group based upon fair value using vendor-specific objective evidence, or VSOE, with the residual revenue allocated to the delivered element. If VSOE of fair value cannot be objectivity determined for any undelivered software elements, we defer revenue until all elements are delivered and services have been performed, or until fair value can objectively be determined for any remaining undelivered elements. The Company allocates revenue within the non-software group to each element based upon its relative selling price in accordance with the selling price hierarchy, which includes: (1) VSOE, if available; (2) third-party evidence, or TPE, if VSOE is not available; and (3) best estimate of selling price, or BESP, if neither VSOE nor TPE is available. The Company establishes BESP considering multiple factors including, but not limited to, historical prices of products sold on a stand-alone basis, cost and gross margin objectives, competitive pricing practices and customer and market specific considerations.
	The Company then recognizes revenue on each deliverable in accordance with its policies for product and service revenue recognition. Revenue allocated to the Company’s products is recognized upon shipment or delivery. Revenue allocated to support services is recognized over the term, which is generally one or three years.
	The Company’s policy is to record revenue net of any applicable sales, use or excise tax.
	Property and Equipment
	Property and equipment consist primarily of capitalized equipment and computer hardware and software, which are stated at cost and depreciated using the straight-line method over the estimated useful lives of two years and three years, respectively. Leasehold improvements are amortized using the straight-line method over the shorter of the lease term or the estimated useful life of the asset. Costs of maintenance and repairs that do not improve or extend the lives of the respective assets are expensed as incurred. Upon retirement or sale, the cost and related accumulated depreciation are removed from the balance sheet and the resulting gain or loss is reflected in operating expenses.
	Research and Development
	Research and development costs are expensed as incurred. Research and development costs consist primarily of personnel costs, prototype expenses, software tools, consulting services and allocated facilities costs.
	Software Development Costs
	The Company expenses software development costs as incurred until technological feasibility is attained, including research and development costs associated with stand-alone software products and software embedded in hardware products. Technological feasibility is attained with the Company has completed the planning, design, and testing phase of development of its software and the software has been determined viable for its intended use, which typically occurs when beta testing commences. The period of time between when beta testing commences and when the software is available for general release to customers has historically been short with immaterial amounts of software development costs incurred during this period. Accordingly, the Company has not capitalized any software development costs to date.
	Advertising Expenses
All advertising costs are expensed as incurred. The Company recognized advertising expenses of $0.6 million, $1.0 million and $1.7 million for the year ended January 31, 2014, 2013 and 2012, respectively.
Income Taxes
Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and operating loss and tax credit carry forwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income (or loss) in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. Valuation allowances are established for deferred tax assets to the extent of the likelihood that the deferred tax assets may not be realized.
The Company evaluates uncertain tax positions taken or expected to be taken in the course of preparing an enterprise’s tax return to determine whether the tax positions are more likely than not of being sustained upon challenge by the applicable tax authority. Tax positions with respect to any potential income tax for the Company not deemed to meet the more likely than not threshold would be recorded as a tax expense in the current year.
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 for each fiscal period presented.
Diluted net loss per share is computed by giving effect to all potential shares of common stock, including stock options, warrants and convertible preferred stock, to the extent dilutive. Basic and diluted net loss per share was the same for each period presented as the inclusion of all potential shares of common stock outstanding would have been anti-dilutive.
Stock-Based Compensation
The Company records stock-based compensation expense related to employee stock-based awards on a straight-line basis based on the estimated fair value of the awards as determined on the date of grant. The Company utilizes the Black-Scholes option pricing model to estimate the fair value of employee stock options. The Black-Scholes model requires the input of highly subjective and complex assumptions, including the estimated fair value of the Company’s common stock on the date of grant, the expected term of the stock option and the expected volatility of the Company’s common stock over the period equal to the expected term of the grant. The Company estimates forfeitures at the date of grant and revises the estimates, if necessary, in subsequent periods if actual forfeitures differ from those estimates.
The Company accounts for stock options that are issued to nonemployees based on the estimated fair value of such awards using the Black-Scholes option pricing model. The measurement of stock-based compensation expense for these awards is variable and subject to periodic adjustments to the estimated fair value until the awards vest and the resulting change in the estimated fair value is recognized in the Company’s consolidated statements of operations during the period in which the related services are rendered.
Starting in fiscal 2013, the Company granted restricted stock units (RSUs) to employees. These restricted stock units 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. 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.
Impairment of Long-Lived Assets
Long-lived assets, such as property and equipment, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. If circumstances require a long-lived asset or asset group be tested for possible impairment, the Company first compares undiscounted cash flows expected to be generated by that asset or asset group to its carrying value. If the carrying value of the long-lived asset or asset group is not recoverable on an undiscounted cash flow basis, an impairment charge is recognized to the extent that the carrying value exceeds its fair value. Fair value is determined through various valuation techniques including discounted cash flow models, quoted market values and third-party independent appraisals, as considered necessary.
Investment in Privately-held Companies
The Company analyzes equity investments in privately held companies to determine if it should be accounted for under the cost or equity method of accounting based on such factors as the percentage ownership of the voting stock outstanding and our ability to exert significant influence over these companies. For the cost method investments, the Company determines if a decline in fair value is considered to be an other-than-temporary impairment. If a decline in fair value is determined to be other-than-temporary, the Company would recognize an impairment at the lower of cost or fair value. As of January 31, 2014, the net carrying value of the Company’s investment in RiverMeadow Software, Inc. was approximately $3.5 million.
For the year ended January 31, 2014, the Company recorded an impairment on one of its cost-method investments in the amount of $0.7 million, which has been recorded in other income (expense), net in the consolidated statement of operations. There was no impairment recorded for the year ended January 31, 2013 or January 31, 2012.
Commitments and Contingencies
Liabilities for loss contingencies arising from claims, assessments, litigation, fines and penalties and other sources are recorded when it is probable that a liability has been incurred and the amount can be reasonably estimated. Legal costs incurred in connection with loss contingencies are expensed as incurred.
Product Warranties
The Company generally provides a three-year warranty on all of its products. The Company accrues for potential liability claims as a component of cost of revenue based upon performance of equipment in the Company’s test and support labs, historical data and trends of product reliability and costs of repairing and replacing defective products. The accrued warranty balance is reviewed periodically for adequacy and is included in accrued liabilities in the consolidated balance sheets.
Recent Accounting Pronouncements
In February 2013, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2013-02, Comprehensive Income (Topic 220): Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income (ASU 2013-02) which is effective prospectively for public companies for reporting periods beginning after December 15, 2012. This new accounting standard improves the reporting of reclassifications out of accumulated other comprehensive income (AOCI) by requiring an entity to report the effect of significant reclassifications out of AOCI on the respective line items in net income if the amount being reclassified is required under GAAP to be reclassified in its entirety to net income. For other amounts that are not required under GAAP to be reclassified in their entirety to net income in the same reporting period, an entity is required to cross-reference other disclosures required under GAAP that provide additional detail about those amounts. We adopted this new guidance on February 1, 2013, and the adoption did not have a material effect on our consolidated financial statements.
In July 2013, the FASB issued ASU No. 2013-11, Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carry-forward, a Similar Tax Loss, or a Tax Credit Carry-forward Exists, which is effective for the periods beginning after December 15, 2013. The new guidance provides that a liability related to an unrecognized tax benefit would be presented as a reduction of a deferred tax asset for a net operating loss carryforward, a similar tax loss or a tax credit carryforward if such settlement is required or expected in the event the uncertain tax position is disallowed. The new guidance becomes effective for the Company on February 1, 2014, and it will be applied prospectively to unrecognized tax benefits that exist at the effective date with retrospective application permitted. The Company does not anticipate that adoption of this new guidance will have a material impact on its consolidated financial position, results of operations or cash flows.

Balance_Sheet_Components

Balance Sheet Components	12 Months Ended
	Jan. 31, 2014
Organization Consolidation And Presentation Of Financial Statements [Abstract]	'
Balance Sheet Components	'
	2. Balance Sheet Components
	Accounts Receivable
	The following table shows the components of accounts receivable, net (in thousands):
			January 31,
			2014			2013
	Accounts receivable		$	21,055		$	22,362
	Allowance for doubtful accounts			—			(350	)
			$	21,055		$	22,012
	The following table shows a rollforward of our allowance for doubtful accounts for the years ended January 31, 2014, 2013 and 2012 (in thousands):
			Balance at			Additions			Deductions			Balance at End
			Beginning of			Charged to						of Year
			Year			Expense or
						Other Accounts
	Year ended January 31, 2014		$	350		$	—		$	(350	)	$	—
	Year ended January 31, 2013			32			357			(39	)		350
	Year ended January 31, 2012			69			(34	)		(3	)		32
	Inventory
	The following table shows the components of inventory (in thousands):
			January 31,
			2014			2013
	Raw materials		$	15,326		$	4,067
	Finished goods			24,327			20,022
			$	39,653		$	24,089
	Included in the components of inventory are reserves of $6.7 million and $5.1 million as of January 31, 2014 and 2013, respectively. In December 2013, the Company decided to pursue strategic alternatives for its PCIe card business and to stop selling its PCIe cards. In light of this decision, the Company recorded a PCIe card inventory provision of $9.2 million. This provision resulted in an increase in inventory reserves of $3.4 million and an increase in accrued liabilities of $5.8 million for non-cancellable purchase orders related to PCIe card components. For the year ended January 31, 2014, the Company also recorded a provision for excess inventory of $1.8 million of which $1.2 million was recorded in the fourth quarter of that year.
	Property and Equipment
	The following table shows the components of property and equipment (in thousands):
			January 31,
			2014			2013
	Laboratory equipment		$	22,854		$	20,588
	Computer hardware and software			11,440			7,620
	Office furniture			305			219
	Leasehold improvements			310			676
				34,909			29,103
	Less: accumulated depreciation			(21,256	)		(16,005	)
			$	13,653		$	13,098
	Depreciation expense (including amortization of leasehold improvements) was $12.6 million, $9.0 million and $5.1 million for fiscal 2014, 2013 and 2012, respectively.
	Accrued Liabilities
	The following table shows the components of accrued liabilities (in thousands):
			January 31,
			2014			2013
	Compensation and benefits		$	9,049		$	6,915
	Customer advance from Toshiba (Note 10)			6,875			—
	Purchase commitments			6,661			—
	Restructuring and transition charges			3,248			—
	Professional fees			4,602			2,855
	Warranty			1,223			994
	Other			5,657			4,369
			$	37,315		$	15,133
	Accrued Warranty
	The following table is a reconciliation of the changes in the Company’s aggregate product warranty liability (in thousands):
			Year Ended January 31,
			2014			2013			2012
	Balance, beginning of year		$	994		$	915		$	219
	Additions			1,663			587			996
	Settlements			(1,434	)		(508	)		(300	)
	Balance, end of year		$	1,223		$	994		$	915
	Accumulated Other Comprehensive Income (Loss)
	The components of accumulated other comprehensive loss were as follows (in thousands):
			January 31,
			2014			2013
	Accumulated net unrealized gain on short-term investments		$	11		$	—
	Accumulated foreign currency translation adjustments			111			81
			$	122		$	81
*	Reclassification adjustments were not significant during each of the years ended January 31, 2014 and 2013, respectively.

Fair_Value_Measurements

Fair Value Measurements	12 Months Ended
	Jan. 31, 2014
Fair Value Disclosures [Abstract]	'
Fair Value Measurements	'
	3. Fair Value Measurements
	The following table presents, for assets or liabilities measured at fair value, the respective fair value and the classification by level of input within the fair value hierarchy (in thousands):
		January 31, 2014
		Level 1		Level 2		Level 3		Total
	Cash equivalents:
	Money market funds	$	15,229	$	—	$	—	$	15,229
	Commercial paper		—		11,099		—		11,099
	Municipal obligations		—		4,601		—		4,601
	Total cash equivalents		15,229		15,700		—		30,929
	Short term investments:						—
	Corporate debt securities		—		8,135		—		8,135
	U.S. government and agency obligations		—		29,132		—		29,132
	Municipal obligations		—		13,841		—		13,841
	Commercial paper		—		7,998		—		7,998
	Total short term investments		—		59,106		—		59,106
		$	15,229	$	74,806	$	—	$	90,035
	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 fiscal 2014.
	No assets or liabilities measured at fair value on a nonrecurring basis were held by the Company as of January 31, 2014 or 2013.
	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	12 Months Ended
	Jan. 31, 2014
Investments Debt And Equity Securities [Abstract]	'
Investments	'
	4. Investments
	Short term investments as of January 31, 2014 consist of U.S. corporate debt securities, U.S. government and municipal debt, agency obligations and commercial paper. No investments were held as of January 31, 2013.
	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 consolidated balance sheets as a component of accumulated comprehensive loss. Realized gains or losses are recorded based on the specific identification method. During the year ended January 31, 2014, 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):
		January 31, 2014
		Amortized		Unrealized		Unrealized			Estimate Fair
		Cost		Gains		Losses			Value
	Corporate debt securities	$	8,134	$	4	$	(3	)	$	8,135
	U.S. government and agency obligations		29,130		5		(3	)		29,132
	Municipal obligations		13,833		8		—			13,841
	Commercial paper		7,998		—		—			7,998
		$	59,095	$	17	$	-6		$	59,106
	The amortized cost and fair value of investments held as of January 31, 2014, by contractual years-to-maturity, are as follows (in thousands):
		Amortized Cost		Fair Value
	Due within one year	$	47,707	$	47,712
	Due within one to two years		11,388		11,394
		$	59,095	$	59,106

Stockholders_Equity

Stockholders' Equity	12 Months Ended
	Jan. 31, 2014
Equity [Abstract]	'
Stockholders' Equity	'
	5. Stockholders’ Equity
	Initial Public Offering
	On October 2, 2013, the Company closed its IPO of 18,000,000 shares of common stock. The public offering price of the shares sold in the IPO was $9.00 per share. The total gross proceeds were $162 million. After deducting underwriting discounts and commissions and IPO expenses, the aggregate net proceeds totaled $145.8 million.
	Convertible Preferred Stock
	Upon the closing of the Company’s IPO, all shares of our then-outstanding convertible preferred stock, as shown on the table below, automatically converted into an aggregate of 47.7 million shares of its common stock. The following table summarizes the convertible preferred stock authorized, issued and outstanding, and the rights and preferences of the respective series immediately prior to the conversion into common stock (in thousands, except per share data):
		Shares				Liquidation		Dividend		Conversion
						Preference		Per Share		Ratio Per
		Authorized		Issued and		Per Share		Per Annum		Share
				Outstanding
	Series 1		8,797		8,796		1.28	$	0.068		0.5
	Series A		35,357		35,357		0.9		0.048		0.5
	Series B		18,265		18,264		3		0.16		0.5
	Series C		13,525		13,525		6		0.32		0.5
	Series D		35,056		19,203		8.75		0.56		0.508499
			111,000		95,145
	Common Stock
	The Company is authorized to issue 1 billion shares of common stock at a par value of $0.0001 per share. As of January 31, 2014 and 2013, the Company had 83.1 million and 15.6 million shares of common stock issued and outstanding, respectively. Holders of common stock are entitled to one vote per share on all matters to be voted upon by the shareholders of the Company.
	Warrants
	During the second quarter of fiscal 2014, the Company issued warrants to purchase 131,875 shares of Series D convertible preferred stock at $6.00 per share. These warrants were issued to TriplePoint in conjunction with the TriplePoint debt facility and to several investors in conjunction with the Company’s sale of convertible notes. In conjunction with the Company’s IPO, the warrants converted to warrants to purchase 84,278 shares of common stock at $11.80 per share. The warrants will expire during the second quarter of fiscal year ended January 31, 2018.

Equity_Award_and_Employee_Comp

Equity Award and Employee Compensation Plans	12 Months Ended
	Jan. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Equity Award and Employee Compensation Plans	'
	6. Equity Award and Employee Compensation Plans
	2005 Stock Plan
	Under the Company’s 2005 Stock Plan (the “2005 Plan”), the Company may directly sell or award restricted shares and grant options to employees, directors and consultants. Under the 2005 Plan, the share awards and options are to be granted at prices no less than the estimated fair value at 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. The 2005 Plan expired October 2, 2013 upon closing of the Company’s IPO and was replaced by the 2012 Stock Incentive Plan.
	2012 Stock Plan
	In November 2012, the Company’s stockholders approved the adoption 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 seven years from the date of grant. Such share awards and options generally vest ratably over four years. The 2012 Stock Plan will expire in 2022.
	Stock Options
	Shares authorized under the 2012 Plan include 14,956,544 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			Number of			Weighted-		Weighted-Average		Aggregate
			Available			Options			Average		Remaining		Intrinsic
			for Grant						Exercise Price		Contractual Life		Value (1)
											(in years)
	Balances, January 31, 2011			24			2,621		$	0.14		9.82	$	1
	Additional shares authorized			8,000
	Options granted			(5,596	)		5,596			1.28
	Options exercised			—			(1,009	)		0.68
	Options forfeited			147			(147	)		0.66
	Repurchase of shares			19			—			—
	Balances, January 31, 2012			2,594			7,061			0.94		9.29	$	12,792
	Additional shares authorized			10,020
	RSUs granted			(9,018	)		—			—
	Options exercised			—			(353	)		0.72
	Options forfeited			641			(641	)		1.08
	RSUs forfeited			555			—			—
	Repurchase of shares			66			—			0.2
	Balances, January 31, 2013			4,858			6,067			0.94		8.31		42,096
	Additional shares authorized			7,500
	RSUs granted			(10,496	)		—			—
	Recovery of shares from net settlement			39			—			—
	RSUs cancelled/forfeited			3,632			—			—
	Options granted			(1,320	)		1,320			5
	Options exercised						(1,008	)		0.61
	Options forfeited			1,149			(1,149	)		2.13
	Repurchase of shares			97			—
	Balances, January 31, 2014			5,459			5,230		$	1.43		7.23	$	19,770
	Options vested and expected to vest – January 31, 2014						4,971		$	1.35		7.24	$	18,792
	Options exercisable – January 31, 2014						4,160		$	0.98		7.31	$	15,726
	-1	Aggregate intrinsic value is based on the common stock price at each respective date presented.
	The weighted average grant date fair value of options granted during the year ended January 31, 2014 was $2.15 per share. The total intrinsic value of options exercised during the year ended January 31, 2014 was $5.6 million.
	The following table summarizes additional information regarding outstanding and exercisable options under the Stock Plans at January 31, 2014 (in thousands, except per share data):
			Options Outstanding						Options
									Exercisable
	Weighted-Average		Number			Weighted-			Number
	Exercise Price ($)		Outstanding			Average Remaining			Exercisable
						Contractual Life (years)
	0.002			60			5.48			60
	0.14			1,244			6.87			1,244
	0.5			205			7.26			194
	1.42			2,865			7.56			2,657
	3.42 - 3.85			851			6.79			—
	7.48			5			9.09			5
				5,230						4,160
	Restricted Stock Units
	The Company’s outstanding restricted stock units under the 2005 Stock Plan, 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. RSUs for which the service condition has been satisfied were not forfeited in the event that an employee terminates 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):
			Number			Weighted-			Aggregate
			of RSUs			Average			Intrinsic
			Outstanding			Grant Date			Value (1)
						Fair Value
	Balance, January 31, 2012			—		$	—		$	—
	RSUs granted			9,018			6.2
	RSUs cancelled/forfeited			(555	)		4.88
Balance, January 31, 2013			8,463			6.52			63,469
RSUs granted			10,496			6.35
RSUs vested			(250	)		6.87
RSUs cancelled/forfeited			(3,632	)		7.46
Balance, January 31, 2014			15,077		$	6.09		$	56,990
-1	Aggregate intrinsic value is based on the common stock price at each respective date presented.
-2	No RSUs were granted prior to January 31, 2012.
The aggregate intrinsic value of RSUs that vested during the year ended January 31, 2014, amounted to $1.5 million.
Non-employee Stock Options and Awards
During the years ended January 31, 2014, 2013 and 2012, the Company granted stock options to purchase 5,000, 0, and 290,500 shares, respectively, to non-employees. The Company granted 6,000 and 177,500 restricted stock units to non-employees in fiscal 2014 and 2013, respectively. No restricted shares of common stock were granted to non-employees in fiscal 2012.
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.
Employee 401(k) Plan
The Company sponsors the Violin Memory, Inc. 401(k) Plan (“401(k) Plan”), which qualifies under Section 401(k) of the Internal Revenue Code and is designed to provide retirement benefits for its eligible employees through tax-deferred salary deductions.
Employees may elect to contribute up to 90% of their eligible compensation to the 401(k) Plan. Employee contributions are limited to a maximum annual amount as set periodically by the Internal Revenue Service (“IRS”). The Company does not currently match employee contributions.

StockBased_Compensation

Stock-Based Compensation	12 Months Ended
	Jan. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Stock-Based Compensation	'
	7. Stock-Based Compensation
	The Company records stock-based compensation expense related to employee stock-based awards on a straight-line basis based on the estimated fair value of the awards as determined on the date of grant. The Company utilizes the Black-Scholes option pricing model to estimate the fair value of employee stock options. The Black-Scholes model requires the input of highly subjective and complex assumptions, including the estimated fair value of the Company’s common stock on the date of grant, the expected term of the stock option and the expected volatility of the Company’s common stock over the period equal to the expected term of the grant. The Company estimates forfeitures at the date of grant and revises the estimates, if necessary, in subsequent periods if actual forfeitures differ from those estimates.
	The Company accounts for stock options that are issued to nonemployees based on the estimated fair value of such awards using the Black-Scholes option pricing model. The measurement of stock-based compensation expense for these awards is variable and subject to periodic adjustments to the estimated fair value until the awards vest and the resulting change in the estimated fair value is recognized in the Company’s consolidated statements of operations during the period in which the related services are rendered.
	As of January 31, 2014, total stock-based compensation cost related to unvested equity awards not yet recognized, net of estimated forfeitures, totaled $38.9 million. The Company expects to amortize $17.3 million in fiscal 2015, $13.9 million in fiscal 2016, $6.5 million in fiscal 2017 and $1.2 million in fiscal 2018. Capitalized stock-based compensation expense was not material 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:
	The Company used the following assumptions for its employee and non-employee option and ESPP grants:
			Year Ended January 31,
	Employee stock options		2014			2013 (1)		2012
	Expected life of options (in years)			3.5 - 4.6			—		5.5 - 6.3
	Expected volatility			45% - 50%			—		67% - 73%
	Risk-free interest rate			0.9% - 1.5%			—		1% -3%
	Dividend yield			—  %			—		—  %
			Year Ended January 31,
	Non-employee stock options		2014		2013 (1)	2012
	Expected life of options (in years)		7.75 - 9.0		—	10
	Expected volatility		50%		—	69% - 73%
	Risk-free interest rate		2.35% - 2.53%		—	1.8% - 2.1%
	Dividend yield		—  %		—	—  %
	-1	No stock options were granted during fiscal 2013.
	Stock based compensation associated with non-employee awards was approximately $0.8 million, $2.5 million and $0.2 million for fiscal 2014, 2013 and 2012, respectively.
	Employee stock purchase plan		Year Ended
			January 31,
			2014
	Expected life (in years)			2.18
	Expected volatility			45.6	%
	Risk-free interest rate			0.12	%
	Dividend yield			—	%
	*	During the year ended January 31, 2014, the Company recognized stock based compensation associated with its ESPP plan of $0.4 million.
	Award Modification and Accelerations
	During fiscal 2014, 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 consolidated statement of operations for fiscal 2014 relating to this modification.
	In January 2014, as part of its retention program, the Company repriced approximately 377,000 stock options originally granted to 51 non-executive employees in September and November 2013 at exercise prices ranging from $5.97 to $8.82 per share to $3.49 per share, the fair market value of the Company’s common stock as of the date of the modification. The incremental compensation charged recognized in FY2014 for these awards was not significant. Total incremental charge relating to this modification, approximately $0.3 million, net of forfeitures, will be recognized using the straight-line attribution method over the remaining service period.
	During the fourth quarter of fiscal 2014, as result of the Company’s strategic restructuring initiatives, the Company accelerated the vesting of certain stock options and RSU awards as result of the termination of certain former executives of the Company. Under the terms of the former employees’ executed employment agreements, accelerated vesting of certain awards was granted in the event of involuntary termination which was not ‘for cause’, as defined in such agreements. As a result, the Company recognized incremental charges relating to equity awards impacted by such accelerations of approximately $14.6 million in the consolidated statement of operations for the year ended January 31, 2014. Given that the acceleration was contemplated in the original employment agreements of these employees, modification accounting was not required.

Income_Taxes

Income Taxes	12 Months Ended
	Jan. 31, 2014
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	8. Income Taxes
	The components of loss before provision for income taxes are as follows (in thousands):
		Year Ended January 31,
		2014			2013			2012
	United States	$	(150,146	)	$	(109,311	)	$	(44,778	)
	Foreign		413			306			—
	Total	$	(149,733	)	$	(109,005	)	$	(44,778	)
	The Company’s tax provision for the years ended January 31, 2014, 2013 and 2012 consists of state taxes. Income tax expense differed from the amounts computed by applying the federal statutory income tax rate of 35% to pretax loss for the years ended January 31, 2014, 2013 and 2012, respectively, as result of the following (in thousands):
		Year Ended January 31,
		2014			2013			2012
	Federal tax at statutory rate	$	(52,406	)	$	(37,021	)	$	(15,225	)
	Loss not being benefited		55,506			37,320			14,677
	State taxes		11			6			5
	Nondeductible expenses		470			1,559			185
	Nondeductible interest on convertible notes		(1,751	)		10			997
	Research credits		(1,754	)		(1,777	)		(632	)
		$	76		$	97		$	7
	The tax effects of temporary differences and carryforwards that give rise to significant portions of the Company’s deferred tax assets and liabilities related to the following (in thousands):
		January 31,
		2014			2013
	Accrual and reserve	$	5,516		$	3,094
	Stock-based compensation		18,031			5,252
	Inventory valuations		3,854			2,494
	Net operating loss carryforwards		56,529			34,861
	Tax credits and other		7,755			4,688
	Depreciation and amortization		39,700			22,807
	Gross deferred tax assets		131,385			73,196
	Valuation allowance		(131,385	)		(73,196	)
	Net deferred tax assets (liabilities)	$	—		$	—
	Management believes that, based on available evidence, both positive and negative, it is more likely than not that the net deferred tax assets will not be utilized, such that a full valuation allowance has been recorded. The valuation allowance for deferred tax assets was $131.4 million as of January 31, 2014. The net change in the total valuation allowance for the year ended January 31, 2014 was an increase of $58.2 million.
	As of January 31, 2014, the Company had approximately $150.5 million and $65.8 million of net operating loss carry forwards available to offset future taxable income for both Federal and State purposes, respectively. If not utilized, these carry forward losses will expire in various amounts for Federal and State tax purposes beginning in 2026 and 2014, respectively. The Company also has Federal and State research and development tax credit carryforwards of approximately $6.4 million and $7.1 million, respectively. The Federal tax credits will expire at various dates beginning in the year 2030 unless previously utilized. The State tax credits do not expire and will carry forward indefinitely until utilized.
	Utilization of the net operating loss carry forwards and credits may be subject to substantial annual limitation due to the ownership change limitations provided by the Internal Revenue Code of 1986, as amended, and similar state provisions. The annual limitation may result in the expiration of net operating losses and credits before utilization.
	The following table reflects changes in the gross unrecognized tax benefits (in thousands):
		January 31,
		2014			2013			2012
	Gross unrecognized tax benefits-beginning of year	$	2,444		$	932		$	367
	Net decreases related to prior year tax positions		(122	)		(106	)		—
	Increases related to current year tax positions		1,726			1,618			565
	Gross unrecognized tax benefits-end of year	$	4,048		$	2,444		$	932
	None of the unrecognized tax benefits would have a net impact to income tax expense if subsequently recognized since the recognition of such benefits would result in a corresponding increase to the Company’s valuation allowance.
	Income taxes payable of $115,000 and $62,000 are included within accrued liabilities in the Company’s consolidated balance sheets as and January 31, 2014 and 2013, respectively.
	The Company’s policy is to classify interest and penalties associated with unrecognized tax benefits as income tax expense. The Company had no interest or penalty accruals associated with uncertain tax benefits.
	The Company is subject to taxation in the United States and in California and New Jersey among other states, and in certain foreign jurisdictions. As of January 31, 2014, the Company’s federal and state returns for the years ended 2005 through the current period are still open to examination. Net operating losses and research and development carryforwards that may be used in future years are still subject to inquiry given that the statute of limitation for these items would be from the year of the utilization. There are no tax years under examination by any jurisdiction at this time.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Jan. 31, 2014
Commitments And Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	9. Commitments and Contingencies
	Litigation
	On August 22, 2012, GCA Savvian Advisors, LLC (“Savvian”) filed an action 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 totaling $10 million, as well as interest, damages and attorney’s fees. We filed a response to the amended complaint on October 2, 2013, and again denied the allegations. The parties have agreed to hold discovery in abeyance pending mediation. Trial in the matter is scheduled for July 2014.
	Beginning on November 26, 2013, four putative 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 the Company’s present or former directors and officers, and several underwriters of the Company’s September 27, 2013 IPO. The complaints purport to assert claims under the federal securities laws on behalf of purchasers of our 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 intends to defend itself vigorously.
	The four complaints have been consolidated into a single, putative class action, and lead co-plaintiffs have been appointed by the court. On March 28, 2014, a consolidated complaint was filed. The court ordered briefing schedule on the defendants’ motion to dismiss contemplates that briefing will be completed by May 23, 2014.
	A purported stockholder derivative action also is pending before the same federal district court judge to whom the putative class action has been assigned. In the derivative action, it is alleged that certain of the Company’s current and former officers and directors breached their fiduciary duties to the Company by violating the federal securities laws and exposing the Company to possible financial liability. The court has approved a stipulation among the parties to stay the derivative action pending resolution of the motion to dismiss the complaint in the putative class action. The Company intends to defend itself vigorously.
	Indemnification
	The Company indemnifies certain of 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 consolidated balance sheets as of January 31, 2014 and 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.
	Operating Lease Commitments
	The Company leases office space under various non-cancelable operating leases that expire at various dates through fiscal 2018. Rent expense related to operating leases was $2.5 million, $2.0 million and $1.0 million for the years ended January 31, 2014, 2013 and 2014, respectively. Future minimum lease payments under the Company’s operating leases as of January 31, 2014, are as follows (in thousands):
	Years ending January 31:
	2015	$	2,196
	2016		3,624
	2017		3,479
	2018		294
		$	9,593
	Purchase Commitments
	The Company depends entirely upon contract manufacturer to manufacture its products and provide test services. Due to the lengthy lead times, the Company must order from its contract manufacturer well in advance and is obligated to pay for the materials when received and services once they are completed. As of January 31, 2014, the Company had approximately $8.7 million of outstanding purchase commitments to such contract manufacturer and other vendors.
	In July 2013, the Company entered into an OEM agreement with a software vendor, which obligates the Company to pay up to an aggregate of $12.0 million, upon the software vendor meeting certain delivery milestones through December 2014. As of January 31, 2014, the remaining purchase commitment totaled $6.0 million.
	In July 2012, we entered into an OEM agreement with a software vendor, which obligates us to pay an aggregate of $5.0 million in minimum royalty fees over a three-year period beginning after the first commercial shipment of the related product. The Company made the first commercial shipment in April 2013 and began paying royalties. As of January 31, 2014, the remaining purchase commitment was $4.0 million.
	Advertising Commitment
	In June 2012, the Company entered into an agreement with the Forty Niners SC Stadium Company LLC, or the Team. As part of this agreement, the Company will receive advertising and related benefits at the stadium under construction in Santa Clara, California from 2014 through 2023. The Company is committed to make payments to the Team of $4.0 million per year beginning in fiscal 2015 and for nine years thereafter.

Related_Party_Transactions

Related Party Transactions	12 Months Ended
	Jan. 31, 2014
Related Party Transactions [Abstract]	'
Related Party Transactions	'
	10. Related Party Transactions
	Toshiba
	As of January 31, 2014, 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 connection with the Series D financing, the Company issued a warrant to Toshiba whereby, at Toshiba’s election, our obligation to pay the past due amounts, if any, owed for goods purchased through the above Sales Agreement, would be satisfied through the issuance of shares of Series D convertible preferred stock at an exercise price of $0.01 per share, the amount of which would be determined by the unpaid past due amount divided by the stock valuation price. The warrants terminated immediately prior to the closing of the Company’s public offering, and no shares of Series D convertible preferred stock were issued pursuant to this warrant. Our Sales Agreement with Toshiba expires in June 2014 and will automatically renew for successive one-year periods unless terminated by either party.
	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 $6.0 million of revenue related to development of PCIe cards and $3.1 million of revenue related to sample products during fiscal 2014 as determined on a relative fair value basis.
	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 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 January 31, 2014 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 fiscal 2014, the Company recognized incremental cost of services of $1.0 million.
	As a result of the Company’s decision to pursue strategic alternatives of the PCIe card business (see Note 11), including a possible sale, it is unclear if Toshiba will accept the remaining milestones and PCIe products under this contract. As such, the Company may not recognize any additional revenue after January 31, 2014. Given this uncertainty and that the contract provides a refund for undelivered elements, the remaining contract value of $6.9 million has been reclassified from deferred revenue to accrued liabilities on the accompanying consolidated balance sheet as of January 31, 2014.
	In addition to the development agreement, the Company recognized revenue of $4.0 million, $3.6 million and $0 million related to the sale of Flash Memory Arrays and services to Toshiba during fiscal 2014, 2013 and 2012, respectively.
	The Company purchased $38.2 million, $27.5 million and $28.6 million of NAND flash memory from Toshiba during fiscal 2014, 2013 and 2012, respectively.
	RiverMeadow Software, Inc.
	In August 2012, the Company purchased 866,325 shares of Series A-1 convertible preferred stock of RiverMeadow Software, Inc., or RiverMeadow, for consideration of $3.0 million representing 9% of the outstanding stock of RiverMeadow. During fiscal 2013, we had product sales to RiverMeadow of $1.4 million. In September 2013, the Company purchased 118,204 shares of Series B convertible preferred stock for consideration of $0.5 million. Mr. Rosenblatt, a former member of our board of directors, serves as a member of the Board of Directors of RiverMeadow, and Mr. Newman serves as the Chairman of the Board of RiverMeadow. From April 2012 to August 2013, Mr. Basile served as a director of RiverMeadow. Mr. Newman and his affiliated entities provide services to RiverMeadow. As of March 31, 2014, Messrs. Basile, Newman and Rosenblatt through their affiliates are also investors in RiverMeadow and collectively with us owned approximately 19% of the outstanding stock of RiverMeadow on a fully diluted basis. As of January 31, 2014, the net book value of the Company’s investment in RiverMeadow was approximately $3.5 million.

Restructuring_and_Transition_C

Restructuring and Transition Charges	12 Months Ended
	Jan. 31, 2014
Restructuring And Related Activities [Abstract]	'
Restructuring and Transition Charges	'
	11. Restructuring and Transition Charges
	During the fourth quarter of fiscal 2014, the Company initiated a restructuring plan focused on accelerating growth and increasing operating leverage, including a reorganization of its sales, marketing and engineering functions in order to better focus on the core segments of the flash-based storage market and improve operating and financial efficiency. In connection with the Company’s restructuring activities and decision to focus on its core Flash Memory Array market, the Company also decided to evaluate strategic alternatives for its PCIe Flash Memory Card product line and engaged an investment banker.
	The Company’s restructuring and transition charges consist primarily of severance, facility costs and other related charges. Severance generally includes severance payments, payments for pro-rata share of earned incentive pay and health insurance coverage. Facility costs include rent expense and related common area maintenance charges attributable to a leased facility that will not utilized over the remaining lease term. Other related charges primarily consist of write-off of purchased software, which will not be utilized and consulting charges associated with global reorganization of the Company. As of January 31, 2014, total cost incurred to date was $4.9 million, primarily relating to severance and benefits.
		January 31,		Expenses		Cash			Other			January 31,
		2013		/Charges		Payments			Adjustments			2014
	Severance and related expenses	$	—	$	2,728	$	(357	)	$	—		$	2,371
	Excess facility charges		—		511		—			—			511
	Impairment of assets		—		1,231		—			(1,231	)		—
	Other restructing expenses		—		399		(33	)		—			366
		$	—	$	4,869	$	(390	)	$	(1,231	)	$	3,248

Segment_Information

Segment Information	12 Months Ended
	Jan. 31, 2014
Segment Reporting [Abstract]	'
Segment Information	'
	12. 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):
		Year Ended January 31,
	Revenue:	2014		2013		2012
	Americas:
	United States	$	66,502	$	56,229	$	34,808
	Other Americas		425		543		181
			66,927		56,772		34,989
	Europe:
	Poland		33		—		12,923
	United Kingdom		7,491		5,270		1,125
	Other Europe		8,970		4,356		475
			16,494		9,626		14,523
	Asia Pacific:		24,235		7,400		4,376
		$	107,656	$	73,798	$	53,888
		January 31,
	Property and Equipment:	2014		2013
	United States	$	13,232	$	12,426
	Europe		415		672
	Asia Pacific		6		—
		$	13,653	$	13,098

Net_Loss_Per_Share

Net Loss Per Share	12 Months Ended
	Jan. 31, 2014
Earnings Per Share [Abstract]	'
Net Loss Per Share	'
	13. 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):
		Year Ended January 31,
		2014			2013			2012
	Numerator:
	Net loss	$	(149,809	)	$	(109,102	)	$	(44,785	)
	Denominator:
	Weighted average common shares outstanding		38,804			15,443			14,856
	Less: Weighted average unvested common shares subject to repurchase		213			1,819			5,460
	Weighted average shares used to compute net loss per share of common stock, basic and diluted		38,591			13,624			9,396
	Net loss per share of common stock, basic and diluted	$	(3.88	)	$	(8.01	)	$	(4.77	)
	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):
		Year Ended January 31,
		2014			2013			2012
	Convertible preferred stock (on an as converted basis)		—			45,858			37,971
	Common stock subject to repurchase		70			356			3,376
	Warrants related to common stock		84			—			—
	Shares subject to outstanding common stock options and restricted stock units		20,307			14,529			7,061
			20,461			60,743			48,408

Debt_Facility_Line_of_Credit_a

Debt Facility, Line of Credit and Convertible Notes	12 Months Ended
	Jan. 31, 2014
Debt Disclosure [Abstract]	'
Debt Facility, Line of Credit and Convertible Notes	'
	14. Debt Facility, Line of Credit and Convertible Notes
	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 January 31, 2014, 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 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 January 31, 2014, the Company was not in default on its debt facility with TriplePoint.
	As of January 31, 2014, 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 January 31, 2014, 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 January 31, 2014).
	Convertible Notes
	In fiscal 2014, the Company issued and sold convertible promissory notes for an aggregate amount of $5.2 million pursuant to a note and warrant purchase agreement. 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.
	The Company also issued $8.7 million and $0.7 million in notes payable (the “Notes”) during the years ended January 31, 2013 and 2012, respectively, which were convertible into preferred stock upon completion of each round of equity financing. The Notes matured, unless earlier converted into shares of preferred stock, on demand by the holders of the Notes at any time after the earlier of: (i) one year from the issuance of the Notes, (ii) an acquisition of the Company or (iii) the disposition of all the assets of the Company. The Series 1, A and B Notes bore 8% interest, and the Series D Notes bore 6% interest per annum.
	The following table is a reconciliation of the changes in the Company’s aggregate convertible notes payable liability (in thousands, except for per share data):
		Notes Value			Shares		Conversion
							Price per Share
	Balance at January 31, 2011	$	14,045
	Issued		682
	Accrued interest		6
	Converted into Series B convertible preferred stock		(14,045	)		8261		1.7
	Balance at January 31, 2012		688
	Issued		8,698
	Accrued interest		29
	Converted into Series D convertible preferred stock		(9,415	)		1569		6
	Balance at January 31, 2013		—
	Issued		5,165
	Accrued interest		43
	Converted into common stock		(5,203	)		585		9
	Balance at January 31, 2014	$	—
	On January 31, 2011, the Board of Directors and note holders approved a change to the conversion rate of the Series B convertible notes whereby the conversion rate of the Series B convertible notes was changed to $1.70. Under the original terms of the Series B convertible notes, the conversion rate was to be equal to the issuance price of the shares sold in a next equity financing; hence, absent the change the Board approved, the Series B convertible notes would have been converted at the $2.00 issuance price of the Series B convertible preferred stock. In accordance with ASC 470-50-40-10, “Debt Modification and Extinguishment,” the modification of the conversion prices resulted in the fair value of the preferred stock received being more than 10 percent of the carrying amount of the original notes. As a result, the modification has been treated as a debt extinguishment of the convertible notes. Accordingly, the Company calculated the extinguishment loss by comparing the carrying amount of the convertible notes to the fair value of the notes at the date of debt extinguishment and recognized $2.9 million in extinguishment loss in fiscal 2012.

Subsequent_Events

Subsequent Events	12 Months Ended
	Jan. 31, 2014
Subsequent Events [Abstract]	'
Subsequent Events	'
	15. Subsequent Events
	Restructuring Plan
	In February 2014, the Company announced a strategic restructuring (the Plan) to accelerate growth and increase operating leverage within the organization. The Plan includes a global reorganization of its sales, marketing and engineering functions designed to sharpen the Company’s focus on core segments of the flash-based storage market, drive greater efficiency and grow revenues by strengthening engagement of indirect channels. As part of the Plan, the Company also announced its plan to review strategic alternatives for its PCIe flash memory card business to focus on markets where the Company has proven technology leadership and significant growth opportunities. The Company anticipates it will complete the review process and take any related actions by the end of the first quarter of fiscal 2015. Once the Plan is complete, the Company expects headcount to be less than 350 employees.
	Settlement of RSUs
	In March 2014, restricted stock units totaling 2.3 million shares for which the service condition was satisfied vested upon satisfaction of the liquidity condition. Under net settlement procedures applicable to the March 15, 2014 vesting date, RSUs totaling approximately 0.8 million shares were withheld to cover the required withholding of income taxes. The value of the RSUs was based on the closing stock price on the applicable settlement date. The Company utilized approximately $3.7 million to cover the related withholding tax obligations of its employees.
	Borrowing
	In March 2014, the Company borrowed $7.5 million on its line of credit agreement with Comerica Bank.
	Settlement Agreement with Company’s Former Chief Executive Officer
	In April 2014, the Company entered into a Settlement Agreement and Release with Dr. Donald G. Basile, the Company’s former chief executive officer and a former member of the Company’s board of directors to resolve claims that arose with respect to Dr. Basile’s rights to severance payments, restricted stock units (“RSUs”) and other matters under the terms of the employment agreement between Dr. Basile and the Company dated May 3, 2012. Pursuant to the settlement agreement and consistent with his employment agreement, Dr. Basile will receive (i) 248,649 shares of common stock in lieu of cash severance of $920,000, (ii) 1,250,000 RSUs that had vested prior to his termination, (iii) 1,625,000 RSUs previously granted to him during his tenure with the Company and which vesting was accelerated and (iii) 18 months of benefits coverage under COBRA.

Organization_and_Summary_of_Si1

Organization and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Jan. 31, 2014
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 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.
	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 paid by the Company, the aggregate net proceeds to the Company totaled $145.8 million.
Basis of Presentation and Consolidation	'
	Basis of Presentation and Consolidation
	We prepared the consolidated financial statements in accordance with U.S. generally accepted accounting principles (GAAP). The consolidated financial statements include the accounts of Violin Memory, Inc. and its wholly owned subsidiaries. All intercompany balances and transactions have been eliminated.
Foreign Currency Transactions and Remeasurement	'
	Foreign Currency Transactions and Remeasurement
	The local currency is the functional currency for each of the Company’s subsidiaries. Assets and liabilities are translated into U.S. dollars at exchange rates in effect at the balance sheet date. Income and expense items are translated at average exchange rates the respective period.
	Gains and losses from foreign currency transactions are included in other income (expense), net. Foreign currency translation adjustments are included in other comprehensive loss.
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.
Concentrations of Market, Credit Risk, Significant Customers and Manufacturing	'
	Concentrations of Market, Credit Risk, Significant Customers and Manufacturing
	The Company participates in the business of developing and manufacturing scalable flash memory arrays and believes that changes in any of the following areas could have a material adverse effect on the Company’s future financial position, results of operations or cash flows: advances and trends in new technologies and industry standards; competitive pressures in the form of new products or price reduction on current products; changes in the overall demand for products offered by the Company; changes in certain strategic relationships or customer relationships; litigation or claims against the Company based on intellectual property, patent, product, regulatory or other factors; and risks associated with changes in domestic and international economic and international and/or political conditions or regulations.
	Financial instruments that potentially subject the Company to concentrations of credit risk primarily consist of cash, cash equivalents, investments and accounts receivable. The Company places its cash and cash equivalents and investments with high credit quality financial institutions which the Company believes are creditworthy. Deposits may exceed the insured limits provided on them.
	The Company generally requires no collateral from its customers. The Company mitigates its credit risk with associated with its accounts receivable by performing ongoing credit evaluations of its customers and establishes an allowance for doubtful accounts for estimated losses based on management’s assessment of the collectability of customer accounts.
	The Company sells to a limited number of large systems vendors, resellers and end-customers and, as a result, maintains individually significant receivable balances with such customers. The Company’s systems vendor customers and certain large resellers tend to be well-capitalized, multi-national companies, while other customers may not be as well capitalized. Sales of products to large systems vendors and resellers are expected to account for a majority of the Company’s revenues in the foreseeable future, and the Company’s financial results will depend in part upon the success of these customers. The composition of the Company’s major customer base may change as the market demand for its products changes, and the Company expects this variability will continue in the future. The loss of, or a significant reduction in purchases by, any of the major customers may harm the Company’s business, financial condition and results of operations.
	The Company relies on a limited number of suppliers for its contract manufacturing and certain raw material components. The Company believes that other vendors would be able to provide similar products and services; however, the qualification of such vendors may require substantial start-up time. In order to mitigate any adverse impacts from disruption of supply, the Company attempts to maintain an adequate supply of critical single-sourced raw materials.
Cash and Cash Equivalents	'
	Cash and Cash Equivalents
	Cash consists of deposits with financial institutions. The Company considers all highly liquid investments with a maturity of three months or less when purchased to be cash equivalents. Cash equivalents consist of money market funds, which are readily convertible into cash and are stated at cost, which approximates fair market value. Cash and cash equivalents were $40.3 million as of January 31, 2014. The Company did not hold any cash equivalents as of January 31, 2013.
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 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 January 31, 2014, 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.
Fair Value Measurements and Disclosures	'
	Fair Value Measurements and Disclosures
	The Company records its financial assets and liabilities at fair value. The accounting guidance for fair value provides a framework for measuring fair value, clarifies the definition of fair value, and expands disclosures regarding fair value measurements. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the reporting date. The accounting guidance establishes a three-tiered hierarchy, which prioritizes the inputs used in the valuation methodologies in measuring fair value:
	Level 1 – Quoted prices in active markets for identical assets or liabilities.
	Level 2 – Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.
	Level 3 – Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.
	The Company recognizes transfers among Level 1, Level 2 and Level 3 classifications as of the actual date of the events or change in circumstances that caused the transfers.
	The Company’s financial instruments, including cash equivalents, accounts receivable, accounts payable and accrued liabilities have carrying amounts which approximate fair value due to the short-term maturity of these instruments.
Accounts Receivable	'
	Accounts Receivable
	Trade accounts receivable are recorded at the invoiced amount and do not bear interest. The Company maintains an allowance for doubtful accounts for estimated losses inherent in its accounts receivable portfolio. In establishing the required allowance, management considers expected losses after taking into account current market conditions, customers’ financial condition, current receivable aging and current payment patterns. Account balances are charged off against the allowance after all means of collection have been exhausted and the potential for recovery is considered remote. As of January 31, 2014 and 2013, the Company’s allowance for doubtful accounts was insignificant.
Inventory	'
	Inventory
	Inventory is stated at the lower of cost or market. Cost is determined using the first-in, first-out method (FIFO method). The Company periodically assesses the recoverability of all inventory, including raw materials and finished goods to determine whether adjustments are required to record inventory at the lower of cost or market. Inventory that the Company determines to be obsolete or in excess of forecasted usage is reduced to its estimated realizable value based on assumptions about future and current market conditions. In the case of inventory which has been written down below cost through the use of a reserve, such reduced amount is considered the cost for subsequent accounting purposes.
Revenue Recognition	'
	Revenue Recognition
	The Company derives revenue primarily from sales of its flash memory arrays, flash memory cards, software and related support and development services. Revenue is recognized when persuasive evidence of an arrangement exists, delivery has occurred or services have been rendered, the price is fixed and determinable and collectability is reasonably assured. Evidence of an arrangement exists when there is a customer contract or purchase order. The Company considers delivery complete when title and risk of loss transfer to the customer, which is generally upon shipment, but no later than physical receipt by the customer.
	The Company sells its products and support services directly to end-customers, systems vendors and resellers. The Company currently does not provide price protection, rebates or other sales incentives to customers. The Company generally does not allow a right of return to its customers, including resellers.
	The Company’s multiple-element arrangements typically include two elements: hardware, which includes embedded software, and support services. Beginning in the second quarter of fiscal 2014, following introduction of the Violin Symphony Management Software Suite, the Company’s multiple-element arrangements also may include software elements. The Company has determined that its hardware and the embedded software are considered a single unit of accounting, because the hardware and software individually do not have standalone value and are not sold separately. Standalone software and support services are each considered a separate unit of accounting as they can be sold separately and have standalone value.
	When more than one element, such as hardware, software and services, are contained in a single arrangement, the Company first allocates arrangement consideration to the software deliverables as a group and non-software deliverables based on the relative selling price method. The Company’s appliance products, embedded software, and certain other services are considered to be non-software deliverables in such arrangements. The Company allocates revenue within the software group based upon fair value using vendor-specific objective evidence, or VSOE, with the residual revenue allocated to the delivered element. If VSOE of fair value cannot be objectivity determined for any undelivered software elements, we defer revenue until all elements are delivered and services have been performed, or until fair value can objectively be determined for any remaining undelivered elements. The Company allocates revenue within the non-software group to each element based upon its relative selling price in accordance with the selling price hierarchy, which includes: (1) VSOE, if available; (2) third-party evidence, or TPE, if VSOE is not available; and (3) best estimate of selling price, or BESP, if neither VSOE nor TPE is available. The Company establishes BESP considering multiple factors including, but not limited to, historical prices of products sold on a stand-alone basis, cost and gross margin objectives, competitive pricing practices and customer and market specific considerations.
	The Company then recognizes revenue on each deliverable in accordance with its policies for product and service revenue recognition. Revenue allocated to the Company’s products is recognized upon shipment or delivery. Revenue allocated to support services is recognized over the term, which is generally one or three years.
	The Company’s policy is to record revenue net of any applicable sales, use or excise tax.
Property and Equipment	'
	Property and Equipment
	Property and equipment consist primarily of capitalized equipment and computer hardware and software, which are stated at cost and depreciated using the straight-line method over the estimated useful lives of two years and three years, respectively. Leasehold improvements are amortized using the straight-line method over the shorter of the lease term or the estimated useful life of the asset. Costs of maintenance and repairs that do not improve or extend the lives of the respective assets are expensed as incurred. Upon retirement or sale, the cost and related accumulated depreciation are removed from the balance sheet and the resulting gain or loss is reflected in operating expenses.
Research and Development	'
	Research and Development
	Research and development costs are expensed as incurred. Research and development costs consist primarily of personnel costs, prototype expenses, software tools, consulting services and allocated facilities costs.
Software Development Costs	'
	Software Development Costs
	The Company expenses software development costs as incurred until technological feasibility is attained, including research and development costs associated with stand-alone software products and software embedded in hardware products. Technological feasibility is attained with the Company has completed the planning, design, and testing phase of development of its software and the software has been determined viable for its intended use, which typically occurs when beta testing commences. The period of time between when beta testing commences and when the software is available for general release to customers has historically been short with immaterial amounts of software development costs incurred during this period. Accordingly, the Company has not capitalized any software development costs to date.
Advertising Expenses	'
	Advertising Expenses
	All advertising costs are expensed as incurred. The Company recognized advertising expenses of $0.6 million, $1.0 million and $1.7 million for the year ended January 31, 2014, 2013 and 2012, respectively.
Income Taxes	'
	Income Taxes
	Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and operating loss and tax credit carry forwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income (or loss) in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. Valuation allowances are established for deferred tax assets to the extent of the likelihood that the deferred tax assets may not be realized.
	The Company evaluates uncertain tax positions taken or expected to be taken in the course of preparing an enterprise’s tax return to determine whether the tax positions are more likely than not of being sustained upon challenge by the applicable tax authority. Tax positions with respect to any potential income tax for the Company not deemed to meet the more likely than not threshold would be recorded as a tax expense in the current year.
Net Loss Per Share	'
	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 for each fiscal period presented.
	Diluted net loss per share is computed by giving effect to all potential shares of common stock, including stock options, warrants and convertible preferred stock, to the extent dilutive. Basic and diluted net loss per share was the same for each period presented as the inclusion of all potential shares of common stock outstanding would have been anti-dilutive.
Stock-Based Compensation	'
	Stock-Based Compensation
	The Company records stock-based compensation expense related to employee stock-based awards on a straight-line basis based on the estimated fair value of the awards as determined on the date of grant. The Company utilizes the Black-Scholes option pricing model to estimate the fair value of employee stock options. The Black-Scholes model requires the input of highly subjective and complex assumptions, including the estimated fair value of the Company’s common stock on the date of grant, the expected term of the stock option and the expected volatility of the Company’s common stock over the period equal to the expected term of the grant. The Company estimates forfeitures at the date of grant and revises the estimates, if necessary, in subsequent periods if actual forfeitures differ from those estimates.
	The Company accounts for stock options that are issued to nonemployees based on the estimated fair value of such awards using the Black-Scholes option pricing model. The measurement of stock-based compensation expense for these awards is variable and subject to periodic adjustments to the estimated fair value until the awards vest and the resulting change in the estimated fair value is recognized in the Company’s consolidated statements of operations during the period in which the related services are rendered.
	Starting in fiscal 2013, the Company granted restricted stock units (RSUs) to employees. These restricted stock units 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. 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.
Impairment of Long-Lived Assets	'
	Impairment of Long-Lived Assets
	Long-lived assets, such as property and equipment, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. If circumstances require a long-lived asset or asset group be tested for possible impairment, the Company first compares undiscounted cash flows expected to be generated by that asset or asset group to its carrying value. If the carrying value of the long-lived asset or asset group is not recoverable on an undiscounted cash flow basis, an impairment charge is recognized to the extent that the carrying value exceeds its fair value. Fair value is determined through various valuation techniques including discounted cash flow models, quoted market values and third-party independent appraisals, as considered necessary.
Investment in Privately-held Companies	'
	Investment in Privately-held Companies
	The Company analyzes equity investments in privately held companies to determine if it should be accounted for under the cost or equity method of accounting based on such factors as the percentage ownership of the voting stock outstanding and our ability to exert significant influence over these companies. For the cost method investments, the Company determines if a decline in fair value is considered to be an other-than-temporary impairment. If a decline in fair value is determined to be other-than-temporary, the Company would recognize an impairment at the lower of cost or fair value. As of January 31, 2014, the net carrying value of the Company’s investment in RiverMeadow Software, Inc. was approximately $3.5 million.
	For the year ended January 31, 2014, the Company recorded an impairment on one of its cost-method investments in the amount of $0.7 million, which has been recorded in other income (expense), net in the consolidated statement of operations. There was no impairment recorded for the year ended January 31, 2013 or January 31, 2012.
Commitments and Contingencies	'
	Commitments and Contingencies
	Liabilities for loss contingencies arising from claims, assessments, litigation, fines and penalties and other sources are recorded when it is probable that a liability has been incurred and the amount can be reasonably estimated. Legal costs incurred in connection with loss contingencies are expensed as incurred.
Product Warranties	'
	Product Warranties
	The Company generally provides a three-year warranty on all of its products. The Company accrues for potential liability claims as a component of cost of revenue based upon performance of equipment in the Company’s test and support labs, historical data and trends of product reliability and costs of repairing and replacing defective products. The accrued warranty balance is reviewed periodically for adequacy and is included in accrued liabilities in the consolidated balance sheets.
Recent Accounting Pronouncements	'
	Recent Accounting Pronouncements
	In February 2013, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2013-02, Comprehensive Income (Topic 220): Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income (ASU 2013-02) which is effective prospectively for public companies for reporting periods beginning after December 15, 2012. This new accounting standard improves the reporting of reclassifications out of accumulated other comprehensive income (AOCI) by requiring an entity to report the effect of significant reclassifications out of AOCI on the respective line items in net income if the amount being reclassified is required under GAAP to be reclassified in its entirety to net income. For other amounts that are not required under GAAP to be reclassified in their entirety to net income in the same reporting period, an entity is required to cross-reference other disclosures required under GAAP that provide additional detail about those amounts. We adopted this new guidance on February 1, 2013, and the adoption did not have a material effect on our consolidated financial statements.
	In July 2013, the FASB issued ASU No. 2013-11, Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carry-forward, a Similar Tax Loss, or a Tax Credit Carry-forward Exists, which is effective for the periods beginning after December 15, 2013. The new guidance provides that a liability related to an unrecognized tax benefit would be presented as a reduction of a deferred tax asset for a net operating loss carryforward, a similar tax loss or a tax credit carryforward if such settlement is required or expected in the event the uncertain tax position is disallowed. The new guidance becomes effective for the Company on February 1, 2014, and it will be applied prospectively to unrecognized tax benefits that exist at the effective date with retrospective application permitted. The Company does not anticipate that adoption of this new guidance will have a material impact on its consolidated financial position, results of operations or cash flows.

Organization_and_Summary_of_Si2

Organization and Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Jan. 31, 2014
Accounting Policies [Abstract]	'
Summary of Customers Accounted as Percentage of Total Revenue and Accounts Receivable	'
	Customers that represented more than 10% of total revenue and gross accounts receivable are as follows:
			Year Ended January 31,
			2014			2013			2012
	Percent of revenue:
	Toshiba (Note 10)			12	%		*	%		*	%
	Hewlett-Packard				*		*			65
	CompSec				*		12			*
			January 31,
			2014			2013
	Percent of gross accounts receivable:
	Commtech Innovative Solutions			27	%		*	%
	Avnet, Inc.			15			*
	Super Micro Computer			*			16
	Daymark Solutions			*			12
		*	Less than 10%.

Balance_Sheet_Components_Table

Balance Sheet Components (Tables)	12 Months Ended
	Jan. 31, 2014
Organization Consolidation And Presentation Of Financial Statements [Abstract]	'
Schedule of Components of Accounts Receivable	'
	The following table shows the components of accounts receivable, net (in thousands):
			January 31,
			2014			2013
	Accounts receivable		$	21,055		$	22,362
	Allowance for doubtful accounts			—			(350	)
			$	21,055		$	22,012
Schedule of Allowance for Doubtful Accounts	'
	The following table shows a rollforward of our allowance for doubtful accounts for the years ended January 31, 2014, 2013 and 2012 (in thousands):
			Balance at			Additions			Deductions			Balance at End
			Beginning of			Charged to						of Year
			Year			Expense or
						Other Accounts
	Year ended January 31, 2014		$	350		$	—		$	(350	)	$	—
	Year ended January 31, 2013			32			357			(39	)		350
	Year ended January 31, 2012			69			(34	)		(3	)		32
Schedule of Inventory Components	'
	The following table shows the components of inventory (in thousands):
			January 31,
			2014			2013
	Raw materials		$	15,326		$	4,067
	Finished goods			24,327			20,022
			$	39,653		$	24,089
Schedule of Components of Property and Equipment	'
	The following table shows the components of property and equipment (in thousands):
			January 31,
			2014			2013
	Laboratory equipment		$	22,854		$	20,588
	Computer hardware and software			11,440			7,620
	Office furniture			305			219
	Leasehold improvements			310			676
				34,909			29,103
	Less: accumulated depreciation			(21,256	)		(16,005	)
			$	13,653		$	13,098
Schedule of Components of Accrued Liabilities	'
	The following table shows the components of accrued liabilities (in thousands):
			January 31,
			2014			2013
	Compensation and benefits		$	9,049		$	6,915
	Customer advance from Toshiba (Note 10)			6,875			—
	Purchase commitments			6,661			—
	Restructuring charges			3,248			—
	Professional fees			4,602			2,855
	Warranty			1,223			994
	Other			5,657			4,369
			$	37,315		$	15,133
Schedule of Reconciliation of Aggregate Product Warranty Liability	'
	The following table is a reconciliation of the changes in the Company’s aggregate product warranty liability (in thousands):
			Year Ended January 31,
			2014			2013			2012
	Balance, beginning of year		$	994		$	915		$	219
	Additions			1,663			587			996
	Settlements			(1,434	)		(508	)		(300	)
	Balance, end of year		$	1,223		$	994		$	915
Schedule of Accumulated Other Comprehensive Loss	'
	The components of accumulated other comprehensive loss were as follows (in thousands):
			January 31,
			2014			2013
	Accumulated net unrealized gain on short-term investments		$	11		$	—
	Accumulated foreign currency translation adjustments			111			81
			$	122		$	81
	*	Reclassification adjustments were not significant during each of the years ended January 31, 2014 and 2013, respectively

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	12 Months Ended
	Jan. 31, 2014
Fair Value Disclosures [Abstract]	'
Summary of Assets or Liabilities Measured at Fair Value	'
	The following table presents, for assets or liabilities measured at fair value, the respective fair value and the classification by level of input within the fair value hierarchy (in thousands):
		January 31, 2014
		Level 1		Level 2		Level 3		Total
	Cash equivalents:
	Money market funds	$	15,229	$	—	$	—	$	15,229
	Commercial paper		—		11,099		—		11,099
	Municipal obligations		—		4,601		—		4,601
	Total cash equivalents		15,229		15,700		—		30,929
	Short term investments:						—
	Corporate debt securities		—		8,135		—		8,135
	U.S. government and agency obligations		—		29,132		—		29,132
	Municipal obligations		—		13,841		—		13,841
	Commercial paper		—		7,998		—		7,998
	Total short term investments		—		59,106		—		59,106
		$	15,229	$	74,806	$	—	$	90,035

Investments_Tables

Investments (Tables)	12 Months Ended
	Jan. 31, 2014
Investments Debt And Equity Securities [Abstract]	'
Schedule of Investments	'
	The Company’s investments are further detailed in the table below (in thousands):
		January 31, 2014
		Amortized		Unrealized		Unrealized			Estimate Fair
		Cost		Gains		Losses			Value
	Corporate debt securities	$	8,134	$	4	$	(3	)	$	8,135
	U.S. government and agency obligations		29,130		5		(3	)		29,132
	Municipal obligations		13,833		8		—			13,841
	Commercial paper		7,998		—		—			7,998
		$	59,095	$	17	$	-6		$	59,106
Amortized Cost and Fair Value of Investments by Contractual Years-to-Maturity	'
	The amortized cost and fair value of investments held as of January 31, 2014, by contractual years-to-maturity, are as follows (in thousands):
		Amortized Cost		Fair Value
	Due within one year	$	47,707	$	47,712
	Due within one to two years		11,388		11,394
		$	59,095	$	59,106

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	12 Months Ended
	Jan. 31, 2014
Equity [Abstract]	'
Summary of Convertible Preferred Stock Authorized, Issued and Outstanding, and Rights and Preferences of Respective Series Immediately Prior to Conversion into Common Stock	'
	The following table summarizes the convertible preferred stock authorized, issued and outstanding, and the rights and preferences of the respective series immediately prior to the conversion into common stock (in thousands, except per share data):
		Shares				Liquidation		Dividend		Conversion
						Preference		Per Share		Ratio Per
		Authorized		Issued and		Per Share		Per Annum		Share
				Outstanding
	Series 1		8,797		8,796		1.28	$	0.068		0.5
	Series A		35,357		35,357		0.9		0.048		0.5
	Series B		18,265		18,264		3		0.16		0.5
	Series C		13,525		13,525		6		0.32		0.5
	Series D		35,056		19,203		8.75		0.56		0.508499
			111,000		95,145

Equity_Award_and_Employee_Comp1

Equity Award and Employee Compensation Plans (Tables)	12 Months Ended
	Jan. 31, 2014
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			Number of			Weighted-		Weighted-Average		Aggregate
			Available			Options			Average		Remaining		Intrinsic
			for Grant						Exercise Price		Contractual Life		Value (1)
											(in years)
	Balances, January 31, 2011			24			2,621		$	0.14		9.82	$	1
	Additional shares authorized			8,000
	Options granted			(5,596	)		5,596			1.28
	Options exercised			—			(1,009	)		0.68
	Options forfeited			147			(147	)		0.66
	Repurchase of shares			19			—			—
	Balances, January 31, 2012			2,594			7,061			0.94		9.29	$	12,792
	Additional shares authorized			10,020
	RSUs granted			(9,018	)		—			—
	Options exercised			—			(353	)		0.72
	Options forfeited			641			(641	)		1.08
	RSUs forfeited			555			—			—
	Repurchase of shares			66			—			0.2
	Balances, January 31, 2013			4,858			6,067			0.94		8.31		42,096
	Additional shares authorized			7,500
	RSUs granted			(10,496	)		—			—
	Recovery of shares from net settlement			39			—			—
	RSUs cancelled/forfeited			3,632			—			—
	Options granted			(1,320	)		1,320			5
	Options exercised						(1,008	)		0.61
	Options forfeited			1,149			(1,149	)		2.13
	Repurchase of shares			97			—
	Balances, January 31, 2014			5,459			5,230		$	1.43		7.23	$	19,770
	Options vested and expected to vest – January 31, 2014						4,971		$	1.35		7.24	$	18,792
	Options exercisable – January 31, 2014						4,160		$	0.98		7.31	$	15,726
	-1	Aggregate intrinsic value is based on the common stock price at each respective date presented.
Summary of Outstanding and Exercisable Options under Stock Plans	'
	The following table summarizes additional information regarding outstanding and exercisable options under the Stock Plans at January 31, 2014 (in thousands, except per share data):
			Options Outstanding						Options
									Exercisable
	Weighted-Average		Number			Weighted-			Number
	Exercise Price ($)		Outstanding			Average Remaining			Exercisable
						Contractual Life (years)
	0.002			60			5.48			60
	0.14			1,244			6.87			1,244
	0.5			205			7.26			194
	1.42			2,865			7.56			2,657
	3.42 - 3.85			851			6.79			—
	7.48			5			9.09			5
				5,230						4,160
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
			of RSUs			Average			Intrinsic
			Outstanding			Grant Date			Value (1)
						Fair Value
	Balance, January 31, 2012			—		$	—		$	—
	RSUs granted			9,018			6.2
	RSUs cancelled/forfeited			(555	)		4.88
	Balance, January 31, 2013			8,463			6.52			63,469
	RSUs granted			10,496			6.35
	RSUs vested			(250	)		6.87
	RSUs cancelled/forfeited			(3,632	)		7.46
	Balance, January 31, 2014			15,077		$	6.09		$	56,990
	-1	Aggregate intrinsic value is based on the common stock price at each respective date presented.
	-2	No RSUs were granted prior to January 31, 2012.

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	12 Months Ended
	Jan. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Schedule of Assumptions to Estimated Fair Value of Options and Purchase Rights under ESPP	'
	The Company used the following assumptions for its employee and non-employee option and ESPP grants:
			Year Ended January 31,
	Employee stock options		2014			2013 (1)		2012
	Expected life of options (in years)			3.5 - 4.6			—		5.5 - 6.3
	Expected volatility			45% - 50%			—		67% - 73%
	Risk-free interest rate			0.9% - 1.5%			—		1% -3%
	Dividend yield			—  %			—		—  %
			Year Ended January 31,
	Non-employee stock options		2014		2013 (1)	2012
	Expected life of options (in years)		7.75 - 9.0		—	10
	Expected volatility		50%		—	69% - 73%
	Risk-free interest rate		2.35% - 2.53%		—	1.8% - 2.1%
	Dividend yield		—  %		—	—  %
	-1	No stock options were granted during fiscal 2013.
	Stock based compensation associated with non-employee awards was approximately $0.8 million, $2.5 million and $0.2 million for fiscal 2014, 2013 and 2012, respectively.
	Employee stock purchase plan		Year Ended
			January 31,
			2014
	Expected life (in years)			2.18
	Expected volatility			45.6	%
	Risk-free interest rate			0.12	%
	Dividend yield			—	%
	*	During the year ended January 31, 2014, the Company recognized stock based compensation associated with its ESPP plan of $0.4 million.

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Jan. 31, 2014
Income Tax Disclosure [Abstract]	'
Components of Loss before Provision for Income Taxes	'
	The components of loss before provision for income taxes are as follows (in thousands):
		Year Ended January 31,
		2014			2013			2012
	United States	$	(150,146	)	$	(109,311	)	$	(44,778	)
	Foreign		413			306			—
	Total	$	(149,733	)	$	(109,005	)	$	(44,778	)
Components of Income Tax Expense Computed by Federal Statutory Income Tax Rate	'
	The Company’s tax provision for the years ended January 31, 2014, 2013 and 2012 consists of state taxes. Income tax expense differed from the amounts computed by applying the federal statutory income tax rate of 34% to pretax loss for the years ended January 31, 2014, 2013 and 2012, respectively, as result of the following (in thousands):
		Year Ended January 31,
		2014			2013			2012
	Federal tax at statutory rate	$	(52,406	)	$	(37,021	)	$	(15,225	)
	Loss not being benefited		55,506			37,320			14,677
	State taxes		11			6			5
	Nondeductible expenses		470			1,559			185
	Nondeductible interest on convertible notes		(1,751	)		10			997
	Research credits		(1,754	)		(1,777	)		(632	)
		$	76		$	97		$	7
Schedule of Tax Effects of Temporary Differences and Carryforwards that Give Rise to Significant Portions of Deferred Tax Assets and Liabilities	'
	The tax effects of temporary differences and carryforwards that give rise to significant portions of the Company’s deferred tax assets and liabilities related to the following (in thousands):
		January 31,
		2014			2013
	Accrual and reserve	$	5,516		$	3,094
	Stock-based compensation		18,031			5,252
	Inventory valuations		3,854			2,494
	Net operating loss carryforwards		56,529			34,861
	Tax credits and other		7,755			4,688
	Depreciation and amortization		39,700			22,807
	Gross deferred tax assets		131,385			73,196
	Valuation allowance		(131,385	)		(73,196	)
	Net deferred tax assets (liabilities)	$	—		$	—
Gross Unrecognized Tax Benefits	'
	The following table reflects changes in the gross unrecognized tax benefits (in thousands):
		January 31,
		2014			2013			2012
	Gross unrecognized tax benefits-beginning of year	$	2,444		$	932		$	367
	Net decreases related to prior year tax positions		(122	)		(106	)		—
	Increases related to current year tax positions		1,726			1,618			565
	Gross unrecognized tax benefits-end of year	$	4,048		$	2,444		$	932

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Jan. 31, 2014
Commitments And Contingencies Disclosure [Abstract]	'
Future Minimum Lease Payments under Operating Leases	'
	Future minimum lease payments under the Company’s operating leases as of January 31, 2014, are as follows (in thousands):
	Years ending January 31:
	2015	$	2,196
	2016		3,624
	2017		3,479
	2018		294
		$	9,593

Restructuring_and_Transition_C1

Restructuring and Transition Charges (Tables)	12 Months Ended
	Jan. 31, 2014
Restructuring And Related Activities [Abstract]	'
Schedule of Restructuring Charges	'
		January 31,		Expenses		Cash			Other			January 31,
		2013		/Charges		Payments			Adjustments			2014
	Severance and related expenses	$	—	$	2,728	$	(357	)	$	—		$	2,371
	Excess facility charges		—		511		—			—			511
	Impairment of assets		—		1,231		—			(1,231	)		—
	Other restructing expenses		—		399		(33	)		—			366
		$	—	$	4,869	$	(390	)	$	(1,231	)	$	3,248

Segment_Information_Tables

Segment Information (Tables)	12 Months Ended
	Jan. 31, 2014
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):
		Year Ended January 31,
	Revenue:	2014		2013		2012
	Americas:
	United States	$	66,502	$	56,229	$	34,808
	Other Americas		425		543		181
			66,927		56,772		34,989
	Europe:
	Poland		33		—		12,923
	United Kingdom		7,491		5,270		1,125
	Other Europe		8,970		4,356		475
			16,494		9,626		14,523
	Asia Pacific:		24,235		7,400		4,376
		$	107,656	$	73,798	$	53,888
		January 31,
	Property and Equipment:	2014		2013
	United States	$	13,232	$	12,426
	Europe		415		672
	Asia Pacific		6		—
		$	13,653	$	13,098

Net_Loss_Per_Share_Tables

Net Loss Per Share (Tables)	12 Months Ended
	Jan. 31, 2014
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):
		Year Ended January 31,
		2014			2013			2012
	Numerator:
	Net loss	$	(149,809	)	$	(109,102	)	$	(44,785	)
	Denominator:
	Weighted average common shares outstanding		38,804			15,443			14,856
	Less: Weighted average unvested common shares subject to repurchase		213			1,819			5,460
	Weighted average shares used to compute net loss per share of common stock, basic and diluted		38,591			13,624			9,396
	Net loss per share of common stock, basic and diluted	$	(3.88	)	$	(8.01	)	$	(4.77	)
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):
		Year Ended January 31,
		2014			2013			2012
	Convertible preferred stock (on an as converted basis)		—			45,858			37,971
	Common stock subject to repurchase		70			356			3,376
	Warrants related to common stock		84			—			—
	Shares subject to outstanding common stock options and restricted stock units		20,307			14,529			7,061
			20,461			60,743			48,408

Debt_Facility_Line_of_Credit_a1

Debt Facility, Line of Credit and Convertible Notes (Tables) (Convertible Notes Payable [Member])	12 Months Ended
	Jan. 31, 2014
Convertible Notes Payable [Member]	'
Reconciliation of Aggregate Convertible Notes Payable Liability	'
	The following table is a reconciliation of the changes in the Company’s aggregate convertible notes payable liability (in thousands, except for per share data):
		Notes Value			Shares		Conversion
							Price per Share
	Balance at January 31, 2011	$	14,045
	Issued		682
	Accrued interest		6
	Converted into Series B convertible preferred stock		(14,045	)		8261		1.7
	Balance at January 31, 2012		688
	Issued		8,698
	Accrued interest		29
	Converted into Series D convertible preferred stock		(9,415	)		1569		6
	Balance at January 31, 2013		—
	Issued		5,165
	Accrued interest		43
	Converted into common stock		(5,203	)		585		9
	Balance at January 31, 2014	$	—

Organization_and_Summary_of_Si3

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

12 Months Ended

12 Months Ended

0 Months Ended

12 Months Ended

Jan. 31, 2014

Jan. 31, 2013

Jan. 31, 2012

Jan. 31, 2011

Jan. 31, 2014

Jan. 31, 2014

Jan. 31, 2013

Oct. 02, 2013

Sep. 12, 2013

Sep. 12, 2013

Sep. 12, 2013

Sep. 12, 2013

Jan. 31, 2014

Jan. 31, 2014

Jan. 31, 2014

Jan. 31, 2014

Jan. 31, 2014

Jan. 31, 2014

Jan. 31, 2014

Minimum [Member]

Maximum [Member]

Cash Equivalents [Member]

IPO [Member]

Common Stock [Member]

Common Stock [Member]

Series D Preferred Stock [Member]

Convertible Preferred Stock [Member]

Restricted Stock Units (RSUs) [Member]

Restricted Stock Units (RSUs) [Member]

Restricted Stock Units (RSUs) [Member]

Capitalized Equipment [Member]

Computer Hardware and Software [Member]

Total Revenue [Member]

Gross Accounts Receivable [Member]

Support services [Member]

Support services [Member]

Secondary Offering [Member]

Secondary Offering [Member]

Minimum [Member]

Maximum [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.

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Conversion of preferred stock, shares converted

'

'

'

'

'

'

'

'

'

'

2

2

'

'

'

'

'

'

'

Conversion of preferred stock, shares issued

'

'

'

'

'

'

'

'

1

1.016998402

'

'

'

'

'

'

'

'

'

Initial public offering, shares issued

83,057,000

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

'

'

'

'

'

'

'

'

'

'

'

Revenue by major customer

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

10.00%

10.00%

Cash and cash equivalents

40,273,000

17,378,000

22,604,000

6,082,000

'

'

0

'

'

'

'

'

'

'

'

'

'

'

'

Revenue recognition term

'

'

'

'

'1 year

'3 years

'

'

'

'

'

'

'

'

'

'

'

'

'

Estimated useful lives

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'2 years

'3 years

'

'

Advertising expenses recognized

600,000

1,000,000

1,700,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Restricted stock units vesting period

'

'

'

'

'

'

'

'

'

'

'

'

'

'3 years

'4 years

'

'

'

'

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.

'

'

'

'

'

'

Net carrying value of Investments

3,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Impairment on cost-method investments

$700,000

$0

$0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Products warranty period

'3 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Organization_and_Summary_of_Si4

Organization and Summary of Significant Accounting Policies - Summary of Customers Accounted as Percentage of Total Revenue and Accounts Receivable (Detail)	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2014	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2014	Jan. 31, 2014	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2013
	Total Revenue [Member]	Total Revenue [Member]	Total Revenue [Member]	Total Revenue [Member]	Gross Accounts Receivable [Member]	Gross Accounts Receivable [Member]	Gross Accounts Receivable [Member]	Gross Accounts Receivable [Member]	Gross Accounts Receivable [Member]
		Toshiba Corporation [Member]	Hewlett-Packard [Member]	CompSec [Member]		Commtech Innovative Solutions [Member]	Avnet, Inc. [Member]	Super Micro Computer [Member]	Daymark Solutions [Member]
Concentration Risk [Line Items]	'	'	'	'	'	'	'	'	'
Percentage of customers accounted for total revenue and accounts receivable	10.00%	12.00%	65.00%	12.00%	10.00%	27.00%	15.00%	16.00%	12.00%

Balance_Sheet_Components_Sched

Balance Sheet Components - Schedule of Components of Accounts Receivable (Detail) (USD $)	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
In Thousands, unless otherwise specified
Statement Of Financial Position [Abstract]	'	'	'	'
Accounts receivable	$21,055	$22,362	'	'
Allowance for doubtful accounts	'	-350	-32	-69
Accounts receivable, net	$21,055	$22,012	'	'

Balance_Sheet_Components_Sched1

Balance Sheet Components - Schedule of Allowance for Doubtful Accounts (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Allowance For Doubtful Accounts Receivable Rollforward	'	'	'
Balance Beginning of Year	$350	$32	$69
Additions Charged Expense or Other Accounts	'	357	-34
Deductions	-350	-39	-3
Balance at End of Year	'	$350	$32

Balance_Sheet_Components_Sched2

Balance Sheet Components - Schedule of Inventory Components (Detail) (USD $)	Jan. 31, 2014	Jan. 31, 2013
In Thousands, unless otherwise specified
Inventory Disclosure [Abstract]	'	'
Raw materials	$15,326	$4,067
Finished goods	24,327	20,022
Inventory	$39,653	$24,089

Balance_Sheet_Components_Addit

Balance Sheet Components - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2013	Jan. 31, 2014	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Property Plant And Equipment [Abstract]	'	'	'	'	'
Inventory reserves	'	$6,700,000	$6,700,000	$5,100,000	'
Inventory provision	9,200,000	'	9,154,000	0	0
Increase in inventory reserve	3,400,000	'	'	'	'
Increase in accrued liabilities	5,800,000	'	15,413,000	7,540,000	8,388,000
Provision for excess inventory	'	1,200,000	1,800,000	'	'
Depreciation expense	'	'	$12,600,000	$9,000,000	$5,100,000

Balance_Sheet_Components_Prope

Balance Sheet Components - Property and Equipment, Net (Detail) (USD $)	Jan. 31, 2014	Jan. 31, 2013
In Thousands, unless otherwise specified
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	$34,909	$29,103
Less: accumulated depreciation	-21,256	-16,005
Property and Equipment, net	13,653	13,098
Laboratory Equipment [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	22,854	20,588
Computer Hardware and Software [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	11,440	7,620
Office Furniture [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	305	219
Leasehold Improvements [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	$310	$676

Balance_Sheet_Components_Sched3

Balance Sheet Components - Schedule of Components of Accrued Liabilities (Detail) (USD $)	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
In Thousands, unless otherwise specified
Payables And Accruals [Abstract]	'	'	'	'
Compensation and benefits	$9,049	$6,915	'	'
Customer advance from Toshiba (Note 10)	6,875	0	'	'
Purchase commitments	6,661	'	'	'
Restructuring and transition charges	3,248	'	'	'
Professional fees	4,602	2,855	'	'
Warranty	1,223	994	915	219
Other	5,657	4,369	'	'
Accrued liabilities	$37,315	$15,133	'	'

Balance_Sheet_Components_Sched4

Balance Sheet Components - Schedule of Reconciliation of Aggregate Product Warranty Liability (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Payables And Accruals [Abstract]	'	'	'
Balance, beginning of year	$994	$915	$219
Additions	1,663	587	996
Settlements	-1,434	-508	-300
Balance, end of year	$1,223	$994	$915

Balance_Sheet_Components_Sched5

Balance Sheet Components - Schedule of Accumulated Other Comprehensive Loss (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]	'	'	'
Accumulated net unrealized gain on short-term investments	$11	'	'
Accumulated foreign currency translation adjustments	111	81	-88
Accumulated other comprehensive loss	$122	$81	'

Fair_Value_Measurements_Summar

Fair Value Measurements - Summary of Assets or Liabilities Measured at Fair Value (Detail) (USD $)	Jan. 31, 2014
In Thousands, unless otherwise specified
Cash equivalents:	'
Total cash equivalents	$30,929
Short term investments:	'
Total short term investments	59,106
Total assets measured at fair value	90,035
Money Market Funds [Member]	'
Cash equivalents:	'
Total cash equivalents	15,229
Commercial Paper [Member]	'
Cash equivalents:	'
Total cash equivalents	11,099
Short term investments:	'
Total short term investments	7,998
Municipal Obligations [Member]	'
Cash equivalents:	'
Total cash equivalents	4,601
Short term investments:	'
Total short term investments	13,841
Corporate Debt Securities [Member]	'
Short term investments:	'
Total short term investments	8,135
U.S. Government and Agency Obligations [Member]	'
Short term investments:	'
Total short term investments	29,132
Level 1 [Member]	'
Cash equivalents:	'
Total cash equivalents	15,229
Short term investments:	'
Total short term investments	'
Total assets measured at fair value	15,229
Level 1 [Member] | Money Market Funds [Member]	'
Cash equivalents:	'
Total cash equivalents	15,229
Level 1 [Member] | Commercial Paper [Member]	'
Cash equivalents:	'
Total cash equivalents	'
Short term investments:	'
Total short term investments	'
Level 1 [Member] | Municipal Obligations [Member]	'
Cash equivalents:	'
Total cash equivalents	'
Short term investments:	'
Total short term investments	'
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 2 [Member]	'
Cash equivalents:	'
Total cash equivalents	15,700
Short term investments:	'
Total short term investments	59,106
Total assets measured at fair value	74,806
Level 2 [Member] | Money Market Funds [Member]	'
Cash equivalents:	'
Total cash equivalents	'
Level 2 [Member] | Commercial Paper [Member]	'
Cash equivalents:	'
Total cash equivalents	11,099
Short term investments:	'
Total short term investments	7,998
Level 2 [Member] | Municipal Obligations [Member]	'
Cash equivalents:	'
Total cash equivalents	4,601
Short term investments:	'
Total short term investments	13,841
Level 2 [Member] | Corporate Debt Securities [Member]	'
Short term investments:	'
Total short term investments	8,135
Level 2 [Member] | U.S. Government and Agency Obligations [Member]	'
Short term investments:	'
Total short term investments	29,132
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] | Municipal Obligations [Member]	'
Cash equivalents:	'
Total cash equivalents	'
Short term investments:	'
Total short term investments	'
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	'

Fair_Value_Measurements_Additi

Fair Value Measurements - Additional Information (Detail) (USD $)	Jan. 31, 2014	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
Transfer of assets measured at fair value between Level 1 and Level 2	0	'
Transfer of liabilities measured at fair value between Level 1 and Level 2	$0	'

Investments_Additional_Informa

Investments - Additional Information (Detail) (USD $)	Jan. 31, 2013
Investments Debt And Equity Securities [Abstract]	'
Investments held	$0

Investments_Schedule_of_Invest

Investments - Schedule of Investments (Detail) (USD $)	Jan. 31, 2014
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'
Amortized Cost	$59,095
Unrealized Gains	17
Unrealized Losses	-6
Estimate Fair Value	59,106
Corporate Debt Securities [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Amortized Cost	8,134
Unrealized Gains	4
Unrealized Losses	-3
Estimate Fair Value	8,135
U.S. Government and Agency Obligations [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Amortized Cost	29,130
Unrealized Gains	5
Unrealized Losses	-3
Estimate Fair Value	29,132
Municipal Obligations [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Amortized Cost	13,833
Unrealized Gains	8
Unrealized Losses	'
Estimate Fair Value	13,841
Commercial Paper [Member]	'
Schedule of Available-for-sale Securities [Line Items]	'
Amortized Cost	7,998
Unrealized Gains	'
Unrealized Losses	'
Estimate Fair Value	$7,998

Investments_Amortized_Cost_and

Investments - Amortized Cost and Fair Value of Investments by Contractual Years-to-Maturity (Detail) (USD $)	Jan. 31, 2014
In Thousands, unless otherwise specified
Investments Debt And Equity Securities [Abstract]	'
Amortized Cost, Due within one year	$47,707
Amortized Cost, Due within one to two years	11,388
Amortized Cost	59,095
Fair Value, Due within one year	47,712
Fair Value, Due within one to two years	11,394
Fair Value	$59,106

Stockholders_Equity_Additional

Stockholders' Equity - Additional Information (Detail) (USD $)	12 Months Ended			12 Months Ended	0 Months Ended
In Millions, except Share data, unless otherwise specified	Jan. 31, 2014	Jan. 31, 2013	Jul. 31, 2013	Jan. 31, 2014	Oct. 02, 2013	Jul. 31, 2013
			Series D [Member]	Common Stock [Member]	IPO [Member]	IPO [Member]
						Common Stock [Member]
Class of Stock [Line Items]	'	'	'	'	'	'
Common stock, shares issued	83,057,000	15,614,000	'	'	18,000,000	'
Initial public offering, price per share	'	'	'	'	$9	'
Total gross proceeds from initial public offering	'	'	'	'	$162	'
Aggregate net proceeds from initial public offering	'	'	'	'	$145.80	'
Convertible preferred stock converted to common stock	'	'	'	47,700,000	'	'
Common stock, shares authorized	1,000,000,000	250,000,000	'	'	'	'
Common stock, par value	$0.00	$0.00	'	'	'	'
Common stock, shares outstanding	83,057,000	15,614,000	'	'	'	'
Voting rights	'One vote per share	'	'	'	'	'
Warrants issued	'	'	131,875	'	'	84,278
Warrants issued, per share	'	'	6	'	'	11.8
Warrants expiration date	31-Jan-18	'	'	'	'	'

Stockholders_Equity_Summary_of

Stockholders' Equity - Summary of Convertible Preferred Stock Authorized, Issued and Outstanding, and Rights and Preferences of Respective Series Immediately Prior to Conversion into Common Stock (Detail) (USD $)	Jan. 31, 2014	Oct. 02, 2013	Jan. 31, 2013
In Thousands, except Per Share data, unless otherwise specified
Temporary Equity [Line Items]	'	'	'
Preferred stock, Shares Authorized	10,000	'	0
Convertible preferred stock, Conversion Ratio Per Share	$0.00	'	$0.00
Series 1 [Member]	'	'	'
Temporary Equity [Line Items]	'	'	'
Preferred stock, Shares Authorized	'	8,797	'
Convertible preferred stock, Shares, Issued and Outstanding	'	8,796	'
Convertible preferred stock, Liquidation Preference Per Share	'	1.28	'
Convertible preferred stock, Dividend Per Share Per Annum	'	0.068	'
Convertible preferred stock, Conversion Ratio Per Share	'	0.5	'
Series A [Member]	'	'	'
Temporary Equity [Line Items]	'	'	'
Preferred stock, Shares Authorized	'	35,357	'
Convertible preferred stock, Shares, Issued and Outstanding	'	35,357	'
Convertible preferred stock, Liquidation Preference Per Share	'	0.9	'
Convertible preferred stock, Dividend Per Share Per Annum	'	0.048	'
Convertible preferred stock, Conversion Ratio Per Share	'	0.5	'
Series B [Member]	'	'	'
Temporary Equity [Line Items]	'	'	'
Preferred stock, Shares Authorized	'	18,265	'
Convertible preferred stock, Shares, Issued and Outstanding	'	18,264	'
Convertible preferred stock, Liquidation Preference Per Share	'	3	'
Convertible preferred stock, Dividend Per Share Per Annum	'	0.16	'
Convertible preferred stock, Conversion Ratio Per Share	'	0.5	'
Series C [Member]	'	'	'
Temporary Equity [Line Items]	'	'	'
Preferred stock, Shares Authorized	'	13,525	'
Convertible preferred stock, Shares, Issued and Outstanding	'	13,525	'
Convertible preferred stock, Liquidation Preference Per Share	'	6	'
Convertible preferred stock, Dividend Per Share Per Annum	'	0.32	'
Convertible preferred stock, Conversion Ratio Per Share	'	0.5	'
Series D [Member]	'	'	'
Temporary Equity [Line Items]	'	'	'
Preferred stock, Shares Authorized	'	35,056	'
Convertible preferred stock, Shares, Issued and Outstanding	'	19,203	'
Convertible preferred stock, Liquidation Preference Per Share	'	8.75	'
Convertible preferred stock, Dividend Per Share Per Annum	'	0.56	'
Convertible preferred stock, Conversion Ratio Per Share	'	0.508499	'
Convertible Preferred Stock [Member]	'	'	'
Temporary Equity [Line Items]	'	'	'
Preferred stock, Shares Authorized	0	111,000	111,000
Convertible preferred stock, Shares, Issued and Outstanding	'	95,145	'
Convertible preferred stock, Conversion Ratio Per Share	$0.00	'	$0.00

Equity_Award_and_Employee_Comp2

Equity Award and Employee Compensation Plans - Additional Information (Detail) (USD $)

12 Months Ended

12 Months Ended

In Millions, except Share data, unless otherwise specified

Jan. 31, 2014

Jan. 31, 2013

Jan. 31, 2012

Jan. 31, 2011

Jan. 31, 2014

Jan. 31, 2013

Jan. 31, 2012

Jan. 31, 2014

Jan. 31, 2014

Jan. 31, 2014

Jan. 31, 2014

Jan. 31, 2014

Jan. 31, 2014

Jan. 31, 2014

Jan. 31, 2014

Non-Employees [Member]

Non-Employees [Member]

Non-Employees [Member]

2005 Stock Plan [Member]

2012 Stock Plan [Member]

Employee 401(k) Plan [Member]

Employee Stock Purchase Plan [Member]

Maximum [Member]

Maximum [Member]

Minimum [Member]

Minimum [Member]

Period

2005 Stock Plan [Member]

Employee Stock Purchase Plan [Member]

2005 Stock 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

'7 years

'

'

'

'

'

'

Share awards and options vesting period

'

'

'

'

'

'

'

'

'4 years

'

'

'4 years

'

'3 years

'

Stock plan expiration date

'

'

'

'

'

'

'

2-Oct-13

'

'

'

'

'

'

'

Percentage of stock appreciation rights granted

'

'

'

'

'

'

'

'

'

'

'

'

'

'

100.00%

Stock Plan expiration year

'

'

'

'

'

'

'

'

'2022

'

'

'

'

'

'

Shares outstanding

5,230,000

6,067,000

7,061,000

2,621,000

'

'

'

'

14,956,544

'

'

'

'

'

'

Shares authorized

'

'

'

'

'

'

'

'

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.

'

'

'

'

'

'

Weighted average grant date fair value of options granted

$2.15

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Intrinsic value of options exercised

$5.60

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Aggregate intrinsic value of vested RSUs

$1.50

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share based compensation, Company granted option to purchase common stock

'

'

'

'

5,000

0

290,500

'

'

'

'

'

'

'

'

Share based compensation, Company granted option to purchase restricted stock

'

'

'

'

6,000

177,500

0

'

'

'

'

'

'

'

'

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%

'

'

'

'

Employee compensation plan, percentage of maximum contribution by employees

'

'

'

'

'

'

'

'

'

90.00%

'

'

'

'

'

Equity_Award_and_Employee_Comp3

Equity Award and Employee Compensation Plans - Summary of Stock Option Activity (Detail) (USD $)	1 Months Ended	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'
Shares Available for Grant, Beginning balance	'	4,858,000	2,594,000	24,000	'
Shares Available for Grant, Ending balance	5,459,000	5,459,000	4,858,000	2,594,000	24,000
Number of Options, Beginning balance	'	6,067,000	7,061,000	2,621,000	'
Number of Options, Additional shares authorized	'	'	'	'	'
Number of Options, RSUs granted	'	-10,496,000	-9,018,000	0	'
Number of Options, RSUs cancelled/forfeited	'	3,632,000	555,000	'	'
Number of Options, Options granted	377,000	1,320,000	'	5,596,000	'
Number of Options, Options exercised	'	-1,008,000	-353,000	-1,009,000	'
Number of Options, Options forfeited	'	-1,149,000	-641,000	-147,000	'
Number of Options, Ending balance	5,230,000	5,230,000	6,067,000	7,061,000	2,621,000
Weighted-Average Exercise Price, Beginning balance	'	$0.94	$0.94	$0.14	'
Number of Options, Options vested and expected to vest	4,971,000	4,971,000	'	'	'
Weighted-Average Exercise Price, Options granted	'	$5	'	$1.28	'
Number of Options, Options exercisable	4,160,000	4,160,000	'	'	'
Weighted-Average Exercise Price, Options exercised	'	$0.61	$0.72	$0.68	'
Weighted-Average Exercise Price, Options forfeited	'	$2.13	$1.08	$0.66	'
Weighted-Average Exercise Price, Repurchase of shares	'	'	$0.20	'	'
Weighted-Average Exercise Price, Ending balance	$1.43	$1.43	$0.94	$0.94	$0.14
Aggregate Intrinsic Value, Beginning balance	'	$42,096	$12,792	$1	'
Weighted-Average Exercise Price, Options vested and expected to vest	$1.35	$1.35	'	'	'
Aggregate Intrinsic Value, Ending balance	19,770	19,770	42,096	12,792	1
Weighted-Average Exercise Price, Options exercisable	$0.98	$0.98	'	'	'
Aggregate Intrinsic Value, Options vested and expected to vest	18,792	18,792	'	'	'
Weighted-Average Remaining Contractual Life (in years)	'	'7 years 2 months 23 days	'8 years 3 months 22 days	'9 years 3 months 15 days	'9 years 9 months 26 days
Aggregate Intrinsic Value, Options exercisable	$15,726	$15,726	'	'	'
Weighted-Average Remaining Contractual Life (in years), Options vested and expected to vest	'	'7 years 2 months 27 days	'	'	'
Weighted-Average Remaining Contractual Life (in years), Options exercisable	'	'7 years 3 months 22 days	'	'	'
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	10,020,000	8,000,000	'
Shares Available for Grant, Recovery of shares from net settlement	'	39,000	'	'	'
Number of Options, Options granted	'	-1,320,000	'	-5,596,000	'
Number of Options, Options exercised	'	'	'	'	'
Shares Available for Grant, Options forfeited	'	1,149,000	641,000	147,000	'
Number of Options, Repurchase of shares	'	97,000	66,000	19,000	'
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	'	-10,496,000	-9,018,000	'	'
Number of Options, RSUs cancelled/forfeited	'	3,632,000	555,000	'	'

Equity_Award_and_Employee_Comp4

Equity Award and Employee Compensation Plans - Summary of Outstanding and Exercisable Options under Stock Plans (Detail) (USD $)	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'	'	'	'
Weighted-average exercise prices	$1.43	$0.94	$0.94	$0.14
Options outstanding, Number outstanding	5,230,000	6,067,000	7,061,000	2,621,000
Options outstanding, Weighted-average remaining contractual life (years)	'7 years 2 months 23 days	'8 years 3 months 22 days	'9 years 3 months 15 days	'9 years 9 months 26 days
Options exercisable, Number exercisable	4,160,000	'	'	'
0.002 [Member]	'	'	'	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'	'	'	'
Weighted-average exercise prices	$0.00	'	'	'
Options outstanding, Number outstanding	60,000	'	'	'
Options outstanding, Weighted-average remaining contractual life (years)	'5 years 5 months 23 days	'	'	'
Options exercisable, Number exercisable	60,000	'	'	'
0.14 [Member]	'	'	'	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'	'	'	'
Weighted-average exercise prices	$0.14	'	'	'
Options outstanding, Number outstanding	1,244,000	'	'	'
Options outstanding, Weighted-average remaining contractual life (years)	'6 years 10 months 13 days	'	'	'
Options exercisable, Number exercisable	1,244,000	'	'	'
0.5 [Member]	'	'	'	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'	'	'	'
Weighted-average exercise prices	$0.50	'	'	'
Options outstanding, Number outstanding	205,000	'	'	'
Options outstanding, Weighted-average remaining contractual life (years)	'7 years 3 months 4 days	'	'	'
Options exercisable, Number exercisable	194,000	'	'	'
1.42 [Member]	'	'	'	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'	'	'	'
Weighted-average exercise prices	$1.42	'	'	'
Options outstanding, Number outstanding	2,865,000	'	'	'
Options outstanding, Weighted-average remaining contractual life (years)	'7 years 6 months 22 days	'	'	'
Options exercisable, Number exercisable	2,657,000	'	'	'
3.42 - 3.85 [Member]	'	'	'	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'	'	'	'
Options outstanding, Number outstanding	851,000	'	'	'
Options outstanding, Weighted-average remaining contractual life (years)	'6 years 9 months 15 days	'	'	'
Options exercisable, Number exercisable	'	'	'	'
7.48 [Member]	'	'	'	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'	'	'	'
Weighted-average exercise prices	$7.48	'	'	'
Options outstanding, Number outstanding	5,000	'	'	'
Options outstanding, Weighted-average remaining contractual life (years)	'9 years 1 month 2 days	'	'	'
Options exercisable, Number exercisable	5,000	'	'	'
Minimum [Member] | 3.42 - 3.85 [Member]	'	'	'	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'	'	'	'
Weighted-average exercise prices	$3.42	'	'	'
Maximum [Member] | 3.42 - 3.85 [Member]	'	'	'	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'	'	'	'
Weighted-average exercise prices	$3.85	'	'	'

Equity_Award_and_Employee_Comp5

Equity Award and Employee Compensation Plans - Restricted Stock Units (Detail) (Restricted Stock Units (RSUs) [Member])	12 Months Ended
	Jan. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
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.
2005 Stock Plan [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
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]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Restricted stock units vesting period	'3 years
Minimum [Member] | 2005 Stock Plan [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Restricted stock units vesting period	'3 years
Maximum [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Restricted stock units vesting period	'4 years
Maximum [Member] | 2005 Stock Plan [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Restricted stock units vesting period	'4 years

Equity_Award_and_Employee_Comp6

Equity Award and Employee Compensation Plans - Summary of Restricted Stock Units Activity (Detail) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'	'	'
Number of RSUs outstanding, Beginning balance	8,463,000	'	'
Number of RSUs outstanding, Granted	10,496,000	9,018,000	0
Number of RSUs outstanding, Cancelled/forfeited	-3,632,000	-555,000	'
Number of RSUs outstanding, Ending balance	15,077,000	8,463,000	'
Number of RSUs outstanding, Vested	-250,000	'	'
Weighted-average grant date fair value, Beginning balance	$6.52	'	'
Weighted-average grant date fair value, Granted	$6.35	$6.20	'
Weighted-average grant date fair value, Cancelled/forfeited	$7.46	$4.88	'
Weighted-average grant date fair value, Ending balance	$6.09	$6.52	'
Weighted-average grant date fair value, Vested	$6.87	'	'
Aggregate Intrinsic Value, Ending balance	$56,990	$63,469	'

Equity_Award_and_Employee_Comp7

Equity Award and Employee Compensation Plans - Summary of Restricted Stock Units Activity (Parenthetical) (Detail)	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'	'	'
Number of RSUs outstanding, Granted	10,496,000	9,018,000	0

StockBased_Compensation_Additi

Stock-Based Compensation - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Stock-based compensation not yet recognized	$38,900,000	$38,900,000	'	'
Stock-based compensation not yet recognized, expects to amortize in fiscal 2015	17,300,000	17,300,000	'	'
Stock-based compensation not yet recognized, expects to amortize in fiscal 2016	13,900,000	13,900,000	'	'
Stock-based compensation not yet recognized, expects to amortize in fiscal 2017	6,500,000	6,500,000	'	'
Stock-based compensation not yet recognized, expects to amortize in fiscal 2018	'	1,200,000	'	'
Capitalized stock-based compensation expense	'	0	'	'
Stock based compensation of non-employee awards	'	800,000	2,500,000	200,000
Recognized stock based compensation of ESPP	'	400,000	'	'
Stock-based compensation expense	'	36,399,000	17,923,000	1,046,000
Stock options grants in period	377,000	1,320,000	'	5,596,000
Incremental charge related to modification	'	300,000	'	'
Exercise Price $5.97 [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Exercise prices range	$5.97	'	'	'
Exercise Price $8.82 [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Exercise prices range	$8.82	'	'	'
Exercise Price $3.49 [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Exercise prices range	$3.49	'	'	'
Non-Executive Employees [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Stock options originally granted, number of employees	51	51	'	'
Non-Employees [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Additional share-based compensation expense	'	14,600,000	'	'
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 Estimated Fair Value of Options and Purchase Rights under ESPP (Detail)	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Employee Stock Options [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Expected life (in years)	'	'	'
Expected volatility	'	'	'
Expected volatility, Minimum	45.00%	'	67.00%
Expected volatility, Maximum	50.00%	'	73.00%
Risk-free interest rate	'	'	'
Risk-free interest rate, Minimum	0.90%	'	1.00%
Risk-free interest rate, Maximum	1.50%	'	3.00%
Dividend yield	'	'	'
Employee Stock Options [Member] | Minimum [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Expected life (in years)	'3 years 6 months	'	'5 years 6 months
Employee Stock Options [Member] | Maximum [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Expected life (in years)	'4 years 7 months 6 days	'	'6 years 3 months 18 days
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	'	'
Expected volatility	45.60%	'	'
Risk-free interest rate	0.12%	'	'
Dividend yield	'	'	'
Non-Employee Stock Options [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Expected life (in years)	'	'	'10 years
Expected volatility	50.00%	'	'
Expected volatility, Minimum	'	'	69.00%
Expected volatility, Maximum	'	'	73.00%
Risk-free interest rate	'	'	'
Risk-free interest rate, Minimum	2.35%	'	1.80%
Risk-free interest rate, Maximum	2.53%	'	2.10%
Dividend yield	'	'	'
Non-Employee Stock Options [Member] | Minimum [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Expected life (in years)	'7 years 9 months	'	'
Non-Employee Stock Options [Member] | Maximum [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Expected life (in years)	'9 years	'	'

StockBased_Compensation_Schedu1

Stock-Based Compensation - Schedule of Assumptions to Estimated Fair Value of Options and Purchase Rights under ESPP (Parenthetical) (Detail)	1 Months Ended	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2014	Jan. 31, 2012	Jan. 31, 2013
				Employee Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Stock options grants in period	377,000	1,320,000	5,596,000	0

Income_Taxes_Components_of_Los

Income Taxes - Components of Loss before Provision for Income Taxes (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Income Tax Disclosure [Abstract]	'	'	'
United States	($150,146)	($109,311)	($44,778)
Foreign	413	306	'
Loss before income taxes	($149,733)	($109,005)	($44,778)

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Operating Loss Carryforwards [Line Items]	'	'	'
Federal statutory income tax rate	35.00%	35.00%	35.00%
Valuation allowance	$131,385,000	$73,196,000	'
Net change in valuation allowance	58,200,000	'	'
Income taxes payable	115,000	62,000	'
Interest or penalty accruals	0	'	'
Federal [Member]	'	'	'
Operating Loss Carryforwards [Line Items]	'	'	'
Net operating loss carry forwards	150,500,000	'	'
Research and development tax credit carryforwards	6,400,000	'	'
State [Member]	'	'	'
Operating Loss Carryforwards [Line Items]	'	'	'
Net operating loss carry forwards	65,800,000	'	'
Research and development tax credit carryforwards	$7,100,000	'	'

Income_Taxes_Components_of_Inc

Income Taxes - Components of Income Tax Expense Computed by Federal Statutory Income Tax Rate (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Income Tax Disclosure [Abstract]	'	'	'
Federal tax at statutory rate	($52,406)	($37,021)	($15,225)
Loss not being benefited	55,506	37,320	14,677
State taxes	11	6	5
Nondeductible expenses	470	1,559	185
Nondeductible interest on convertible notes	-1,751	10	997
Research credits	-1,754	-1,777	-632
Income taxes	$76	$97	$7

Income_Taxes_Components_of_Com

Income Taxes - Components of Company's Deferred Tax Assets and Liabilities (Detail) (USD $)	Jan. 31, 2014	Jan. 31, 2013
In Thousands, unless otherwise specified
Income Tax Disclosure [Abstract]	'	'
Accrual and reserve	$5,516	$3,094
Stock-based compensation	18,031	5,252
Inventory valuations	3,854	2,494
Net operating loss carryforwards	56,529	34,861
Tax credits and other	7,755	4,688
Depreciation and amortization	39,700	22,807
Gross deferred tax assets	131,385	73,196
Valuation allowance	-131,385	-73,196
Net deferred tax assets (liabilities)	'	'

Income_Taxes_Gross_Unrecognize

Income Taxes - Gross Unrecognized Tax Benefits (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Income Tax Disclosure [Abstract]	'	'	'
Gross unrecognized tax benefits-beginning of year	$2,444	$932	$367
Net decreases related to prior year tax positions	-122	-106	'
Increases related to current year tax positions	1,726	1,618	565
Gross unrecognized tax benefits-end of year	$4,048	$2,444	$932

Commitments_and_Contingencies_1

Commitments and Contingencies - Additional Information (Detail) (USD $)	0 Months Ended	12 Months Ended					0 Months Ended
	Nov. 26, 2013	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012	Jul. 31, 2013	Jul. 31, 2012	Aug. 26, 2013	Jan. 31, 2014	Jan. 31, 2014	Jan. 31, 2014	Jan. 31, 2013
	Lawsuits						Savvian Litigation [Member]	Software Vendor [Member]	Other Software Vendor [Member]	Indemnification Agreement [Member]	Indemnification Agreement [Member]
Loss Contingencies [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Offering fees, payment sought	'	'	'	'	'	'	$10,000,000	'	'	'	'
Number of lawsuits filed	4	'	'	'	'	'	'	'	'	'	'
Class action filing date	'	26-Nov-13	'	'	'	'	'	'	'	'	'
Liabilities recorded for indemnification agreements	'	'	'	'	'	'	'	'	'	0	0
Rent expense related to operating leases	'	2,500,000	2,000,000	1,000,000	'	'	'	'	'	'	'
Outstanding purchase commitments	'	8,700,000	'	'	'	'	'	'	'	'	'
Purchase commitments obligations	'	'	'	'	12,000,000	5,000,000	'	'	'	'	'
Remaining purchase commitment	'	'	'	'	'	'	'	6,000,000	4,000,000	'	'
Advertising Commitment description	'	'In June 2012, the Company entered into an agreement with the Forty Niners SC Stadium Company LLC, or the Team. As part of this agreement, the Company will receive advertising and related benefits at the stadium under construction in Santa Clara, California from 2014 through 2023. The Company is committed to make payments to the Team of $4.0 million per year beginning in fiscal 2015 and for nine years thereafter.	'	'	'	'	'	'	'	'	'
Advertising Commitment	'	$4,000,000	'	'	'	'	'	'	'	'	'
Payment commitment period	'	'Beginning in fiscal 2015 and for nine years thereafter.	'	'	'	'	'	'	'	'	'

Commitments_and_Contingencies_2

Commitments and Contingencies - Future Minimum Lease Payments under Operating Leases (Detail) (USD $)	Jan. 31, 2014
In Thousands, unless otherwise specified
Commitments And Contingencies Disclosure [Abstract]	'
2015	$2,196
2016	3,624
2017	3,479
2018	294
Total	$9,593

Related_Party_Transactions_Add

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

Jan. 31, 2014

Jan. 31, 2013

Jul. 31, 2013

Jan. 31, 2014

Jan. 31, 2014

Jul. 31, 2013

Jan. 31, 2014

Jul. 31, 2013

Jan. 31, 2014

Jun. 30, 2011

Jan. 31, 2014

Jan. 31, 2013

Jan. 31, 2012

Jan. 31, 2014

Jan. 31, 2013

Jan. 31, 2012

Jan. 31, 2014

Aug. 31, 2012

Sep. 30, 2013

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]

RiverMeadow Software, Inc. [Member]

RiverMeadow Software, Inc. [Member]

RiverMeadow Software, Inc. [Member]

Series D Preferred Stock [Member]

Development of PCIe Cards [Member]

Development of PCIe Cards [Member]

Sample PCIe Cards [Member]

Sample PCIe Cards [Member]

Flash Memory [Member]

Flash Memory Array and services[Member]

Flash Memory Array and services[Member]

Flash Memory Array and services[Member]

NAND Flash Memory [Member]

NAND Flash Memory [Member]

NAND Flash Memory [Member]

Series A-1 Convertible Preferred Stock [Member]

Series B [Member]

Related Party Transaction [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock outstanding

83,057,000

15,614,000

'

9,200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of common stock outstanding

'

'

'

11.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Sales agreement purchase percentage

'

'

'

'

'

'

'

'

'

70.00%

'

'

'

'

'

'

'

'

'

Exercise price per share

'

'

'

'

$0.01

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Preferred stock, shares issued

'

'

'

'

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Sales Agreement expiration period

'

'

'

'2014-06

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Sales Agreement renewal period

'

'

'

'1 year

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Prepayment received from related party

'

'

$16,000,000

'

'

$8,000,000

'

$8,000,000

'

'

'

'

'

'

'

'

'

'

'

Revenue recognized related to development

'

'

'

'

'

'

6,000,000

'

3,100,000

'

'

'

'

'

'

'

'

'

'

Recognized incremental cost

'

'

'

1,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Remaining contract value

12,208,000

6,808,000

'

6,900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Product sales to related party

'

'

'

'

'

'

'

'

'

'

4,000,000

3,600,000

0

'

'

'

1,400,000

'

'

Purchases from related party

'

'

'

'

'

'

'

'

'

'

'

'

'

38,200,000

27,500,000

28,600,000

'

'

'

Number of shares purchased

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

866,325

118,204

Consideration transferred

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3,000,000

500,000

Percentage of outstanding stock purchased

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

9.00%

'

Percentage of outstanding stock owned by noncontrolling owners

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

19.00%

'

'

Net book value of investment

$3,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$3,500,000

'

'

Restructuring_and_Transition_C2

Restructuring and Transition Charges - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Reorganizations [Abstract]	'	'	'
Incurred restructuring cost	$4,869	$0	$0

Restructuring_and_Transition_C3

Restructuring and Transition Charges - Schedule of Restructuring Charges (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Restructuring Cost and Reserve [Line Items]	'	'	'
Restructuring charges, beginning balance	'	'	'
Expenses/Charges	4,869	0	0
Cash Payments	-390	'	'
Other Adjustments	-1,231	'	'
Restructuring charges, ending balance	3,248	'	'
Severance and Related Expenses [Member]	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'
Restructuring charges, beginning balance	'	'	'
Expenses/Charges	2,728	'	'
Cash Payments	-357	'	'
Other Adjustments	'	'	'
Restructuring charges, ending balance	2,371	'	'
Excess Facility Charges [Member]	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'
Restructuring charges, beginning balance	'	'	'
Expenses/Charges	511	'	'
Cash Payments	'	'	'
Other Adjustments	'	'	'
Restructuring charges, ending balance	511	'	'
Impairment of Assets [Member]	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'
Restructuring charges, beginning balance	'	'	'
Expenses/Charges	1,231	'	'
Cash Payments	'	'	'
Other Adjustments	-1,231	'	'
Restructuring charges, ending balance	'	'	'
Other Restructing Expenses [Member]	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'
Restructuring charges, beginning balance	'	'	'
Expenses/Charges	399	'	'
Cash Payments	-33	'	'
Other Adjustments	'	'	'
Restructuring charges, ending balance	$366	'	'

Segment_Information_Additional

Segment Information - Additional Information (Detail)	12 Months Ended
	Jan. 31, 2014
	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 $)	12 Months Ended
In Thousands, unless otherwise specified	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Segment Reporting Information [Line Items]	'	'	'
Total Revenue	$107,656	$73,798	$53,888
Property and equipment, net	13,653	13,098	'
United States [Member]	'	'	'
Segment Reporting Information [Line Items]	'	'	'
Total Revenue	66,502	56,229	34,808
Property and equipment, net	13,232	12,426	'
Other Americas [Member]	'	'	'
Segment Reporting Information [Line Items]	'	'	'
Total Revenue	425	543	181
Americas [Member]	'	'	'
Segment Reporting Information [Line Items]	'	'	'
Total Revenue	66,927	56,772	34,989
Poland [Member]	'	'	'
Segment Reporting Information [Line Items]	'	'	'
Total Revenue	33	'	12,923
United Kingdom [Member]	'	'	'
Segment Reporting Information [Line Items]	'	'	'
Total Revenue	7,491	5,270	1,125
Other Europe [Member]	'	'	'
Segment Reporting Information [Line Items]	'	'	'
Total Revenue	8,970	4,356	475
Europe [Member]	'	'	'
Segment Reporting Information [Line Items]	'	'	'
Total Revenue	16,494	9,626	14,523
Property and equipment, net	415	672	'
Asia Pacific [Member]	'	'	'
Segment Reporting Information [Line Items]	'	'	'
Total Revenue	24,235	7,400	4,376
Property and equipment, net	$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 $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Numerator:	'	'	'
Net loss	($149,809)	($109,102)	($44,785)
Denominator:	'	'	'
Weighted average common shares outstanding	38,804	15,443	14,856
Less: Weighted average unvested common shares subject to repurchase	213	1,819	5,460
Weighted average shares used to compute net loss per share of common stock, basic and diluted	38,591	13,624	9,396
Net loss per share of common stock, basic and diluted	($3.88)	($8.01)	($4.77)

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)	12 Months Ended
In Thousands, unless otherwise specified	Jan. 31, 2014	Jan. 31, 2013	Jan. 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	20,461	60,743	48,408
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	'	45,858	37,971
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	70	356	3,376
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	'	'
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	20,307	14,529	7,061

Debt_Facility_Line_of_Credit_a2

Debt Facility, Line of Credit and Convertible Notes - Additional Information (Detail) (USD $)

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

Jan. 31, 2014

Jan. 31, 2013

Jan. 31, 2012

Jan. 31, 2011

Jan. 31, 2014

Jan. 31, 2014

Jan. 31, 2014

Jan. 31, 2014

Jan. 31, 2012

Oct. 02, 2013

Aug. 31, 2013

Jun. 30, 2013

Jan. 31, 2011

Jan. 31, 2014

31-May-13

Jan. 31, 2014

Jan. 31, 2014

Jan. 31, 2014

Series A Notes [Member]

Series B Notes [Member]

Series D Notes [Member]

Line of Credit [Member]

Convertible Notes Payable [Member]

Convertible Notes Payable [Member]

Convertible Notes Payable [Member]

Convertible Notes Payable [Member]

Convertible Notes Payable [Member]

TriplePoint Capital LLC [Member]

TriplePoint Capital LLC [Member]

Minimum [Member]

Maximum [Member]

Maximum [Member]

Secured Debt [Member]

Secured Debt [Member]

TriplePoint Capital LLC [Member]

Line of Credit [Member]

TriplePoint 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

'

'

'

10.00%

'

'

'

'

'

'

'

'

'

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

5,165,000

8,698,000

682,000

'

'

'

'

'

'

'

'

5,200,000

'

'

'

'

'

'

Convertible promissory notes, interest rate

'

'

'

'

8.00%

8.00%

6.00%

'

'

'

10.00%

'

'

'

'

'

'

'

Accrued interest converted into common stock, price per share

'

'

'

'

'

'

'

'

'

$9

'

'

'

'

'

'

'

'

Issuance of notes payable

'

8.7

0.7

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt instrument description

'The Notes matured, unless earlier converted into shares of preferred stock, on demand by the holders of the Notes at any time after the earlier of (i) one year from the issuance of the Notes, (ii) an acquisition of the Company or (iii) the disposition of all the assets of the Company. The Series 1, A and B Notes bore 8% interest, and the Series D Notes bore 6% interest per annum.

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Conversion rate of the Series B convertible notes

'

'

'

$1.70

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Issuance price of the Series B convertible preferred stock

'

'

'

'

'

'

'

'

'

'

'

'

$2

'

'

'

'

'

Extinguishment loss

$0

($31,000)

($2,921,000)

'

'

'

'

'

$2,900,000

'

'

'

'

'

'

'

'

'

Debt_Facility_Line_of_Credit_a3

Debt Facility, Line of Credit and Convertible Notes - Reconciliation of Aggregate Convertible Notes Payable Liability (Detail) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Debt Instrument [Line Items]	'	'	'	'
Beginning balance	'	$688	$14,045	'
Issued	5,165	8,698	682	'
Accrued interest	43	29	6	'
Stock converted, value	-5,203	0	0	'
Ending balance	'	'	688	'
Conversion Price per Share	'	'	'	$1.70
Series B Convertible Preferred Stock [Member]	'	'	'	'
Debt Instrument [Line Items]	'	'	'	'
Stock converted, value	'	'	-14,045	'
Shares	'	'	8,261	'
Conversion Price per Share	'	'	$1.70	'
Series D Preferred Stock [Member]	'	'	'	'
Debt Instrument [Line Items]	'	'	'	'
Stock converted, value	'	-9,415	'	'
Shares	'	1,569	'	'
Conversion Price per Share	'	$6	'	'
Common Stock [Member]	'	'	'	'
Debt Instrument [Line Items]	'	'	'	'
Stock converted, value	($5,203)	'	'	'
Shares	585	'	'	'
Conversion Price per Share	$9	'	'	'

Subsequent_Events_Additional_I

Subsequent Events - Additional Information (Detail) (USD $)	12 Months Ended			1 Months Ended			1 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2014	Feb. 28, 2014	Feb. 28, 2014
				Subsequent Events [Member]	Subsequent Events [Member]	Subsequent Events [Member]	Subsequent Events [Member]	Subsequent Events [Member]	Subsequent Events [Member]
					Defined Benefit Postretirement Health Coverage [Member]	Comerica Bank [Member]	Restricted Stock Units (RSUs) [Member]	Restructuring Plan [Member]	Restructuring Plan [Member]
									Maximum [Member]
									Employees
Subsequent Event [Line Items]	'	'	'	'	'	'	'	'	'
Expected headcount	'	'	'	'	'	'	'	'	350
Restructuring Plan expected to be completed	'	'	'	'	'	'	'	30-Apr-15	'
Restricted stock units vested upon liquidity condition	'	'	'	'	'	'	2,300,000	'	'
Restricted stock units withheld to cover required withholding of taxes	'	'	'	'	'	'	800,000	'	'
Cash utilized to cover income tax obligations	'	'	'	'	'	'	$3,700,000	'	'
Borrowings on line of credit agreement	'	'	'	'	'	7,500,000	'	'	'
Number of common stock in lieu of cash severance	'	'	'	248,649	'	'	'	'	'
Severance cash payments	$390,000	'	'	$920,000	'	'	'	'	'
Number of RSUs outstanding, Vested	250,000	'	'	'	'	'	1,250,000	'	'
Number of RSUs outstanding, Granted	10,496,000	9,018,000	0	'	'	'	1,625,000	'	'
Coverage benefits under COBRA	'	'	'	'	'18 months	'	'	'	'