Violin Memory (VMEMQ) 10-Q 11 Sep 14 2015 Q2 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	6 Months Ended
	Jul. 31, 2014	Aug. 29, 2014
Document And Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	31-Jul-14	'
Document Fiscal Year Focus	'2015	'
Document Fiscal Period Focus	'Q2	'
Entity Registrant Name	'Violin Memory Inc	'
Entity Central Index Key	'0001407190	'
Current Fiscal Year End Date	'--01-31	'
Entity Filer Category	'Non-accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	92,055,160

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Jul. 31, 2014	Jan. 31, 2014
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$54,844	$40,273
Restricted cash	2,300	'
Short-term investments	23,125	59,106
Accounts receivable, net (including amounts due from a related party of $364 and $565 as of July 31, 2014 and January 31, 2014, respectively)	12,060	21,055
Inventory	33,926	39,653
Other current assets	8,249	6,154
Total current assets	134,504	166,241
Property and equipment, net	11,861	13,653
Other assets	5,781	4,769
Total assets	152,146	184,663
Current liabilities:	'	'
Short-term borrowings	9,826	'
Accounts payable (including amounts due to a related party of $8,035 and $12,208 as of July 31, 2014 and January 31, 2014, respectively)	17,133	18,389
Accrued liabilities (including amounts due to a related party of $0 and $6,875 as of July 31, 2014 and January 31, 2014, respectively)	20,506	37,315
Deferred revenue, current (including amounts received from a related party of $45 and $89 as of July 31, 2014 and January 31, 2014, respectively)	13,729	13,480
Total current liabilities	61,194	69,184
Deferred revenue, noncurrent (including amounts received from a related party of $38 and $43 as of July 31, 2014 and January 31, 2014, respectively)	10,719	11,755
Long-term liabilities	1,074	'
Total liabilities	72,987	80,939
Stockholders' equity:	'	'
Preferred stock, $0.0001 par value, 10,000 shares authorized as of July 31, 2014; no shares issued and outstanding as of July 31, 2014 and January 31, 2014	'	'
Common stock, $0.0001 par value, 1,000,000 shares authorized as of July 31, 2014; 91,435 and 83,057 shares issued and outstanding as of July 31, 2014 and January 31, 2014, respectively	9	8
Additional paid-in capital	470,407	456,223
Accumulated other comprehensive income	-80	115
Accumulated deficit	-391,177	-352,622
Total stockholders' equity	79,159	103,724
Total liabilities and stockholders' equity	$152,146	$184,663

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Jul. 31, 2014	Jan. 31, 2014
In Thousands, except Per Share data, unless otherwise specified
Statement Of Financial Position [Abstract]	'	'
Accounts receivable, amounts due from a related party	$364	$565
Accounts payable, amounts due to a related party	8,035	12,208
Accrued liabilities, amounts due to a related party	0	6,875
Deferred revenue from related party, current	45	89
Deferred revenue from related party, noncurrent	$38	$43
Preferred stock, par value	$0.00	$0.00
Preferred stock, shares authorized	10,000	10,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$0.00	$0.00
Common stock, shares authorized	1,000,000	1,000,000
Common stock, shares issued	91,435	91,435
Common stock, shares outstanding	83,057	83,057

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (USD $)	3 Months Ended				6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jul. 31, 2014		Jul. 31, 2013		Jul. 31, 2014		Jul. 31, 2013
Revenue:	'		'		'		'
Product revenue (including related party sales of $364 and $594 for the three months ended July 31, 2014 and 2013, respectively; and $855 and $2,245 for the six months ended July 31, 2014 and 2013, respectively)	$14,188		$23,595		$26,961		$46,073
Service revenue (including related party sales of $33 and $61 for the three months ended July 31, 2014 and 2013, respectively; and $1,075 and $117 for the six months ended July 31, 2014 and 2013, respectively)	4,405		2,910		9,765		5,230
Total revenue	18,593		26,505		36,726		51,303
Cost of revenue:	'		'		'		'
Cost of product revenue (including related party purchases of $343 and $5,994 for the three months ended July 31, 2014 and 2013, respectively; and $5,911 and $13,274 for the six months ended July 31, 2014 and 2013, respectively)	6,934	[1]	13,661	[1]	13,600	[1]	26,738	[1]
Cost of service revenue	1,971	[1]	1,673	[1]	3,869	[1]	3,322	[1]
Total cost of revenue	8,905		15,334		17,469		30,060
Gross profit	9,688		11,171		19,257		21,243
Operating expenses:	'		'		'		'
Sales and marketing	15,107	[1]	18,624	[1]	31,340	[1]	36,876	[1]
Research and development	12,994	[1]	18,800	[1]	28,830	[1]	34,734	[1]
General and administrative	5,154	[1]	4,040	[1]	10,986	[1]	8,150	[1]
Gain on sale of PCI product line	-17,448		'		-17,448		'
Restructuring charges	1,306		'		3,062		'
Litigation settlement	652		'		652		'
Total operating expenses	17,765		41,464		57,422		79,760
Loss from operations	-8,077		-30,293		-38,165		-58,517
Other income (expense), net	-181		-6		-62		-286
Interest expense	-124		-342		-292		-342
Loss before income taxes	-8,382		-30,641		-38,519		-59,145
Income taxes	30		7		36		27
Net loss	($8,412)		($30,648)		($38,555)		($59,172)
Net loss per share of common stock, basic and diluted	($0.09)		($1.98)		($0.43)		($3.84)
Shares used in computing net loss per share of common stock, basic and diluted	91,410		15,507		88,839		15,425
[1]	Includes stock-based compensation expense, as follows: Cost of product revenue $ 279 $ 22 $ 458 $ 39 Cost of service revenue 93 425 180 651 Sales and marketing 1,191 1,763 2,628 3,280 Research and development 1,834 1,260 6,100 2,620 General and administrative 1,419 1,653 3,090 3,354 $ 4,816 $ 5,123 $ 12,456 $ 9,944

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Operations (Parenthetical) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2014	Jul. 31, 2013
Cost of product revenue, related party purchases	$343	$5,994	$5,911	$13,274
Stock-based compensation expense	4,816	5,123	12,456	9,944
Product Revenue [Member]	'	'	'	'
Revenue from related party sales	364	594	855	2,245
Services Revenue [Member]	'	'	'	'
Revenue from related party sales	33	61	1,075	117
Cost of Product Revenue [Member]	'	'	'	'
Stock-based compensation expense	279	22	458	39
Cost of Service Revenue [Member]	'	'	'	'
Stock-based compensation expense	93	425	180	651
Sales and Marketing [Member]	'	'	'	'
Stock-based compensation expense	1,191	1,763	2,628	3,280
Research and Development [Member]	'	'	'	'
Stock-based compensation expense	1,834	1,260	6,100	2,620
General and Administrative [Member]	'	'	'	'
Stock-based compensation expense	$1,419	$1,653	$3,090	$3,354

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Comprehensive Loss (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2014	Jul. 31, 2013
Statement Of Income And Comprehensive Income [Abstract]	'	'	'	'
Net loss	($8,412)	($30,648)	($38,555)	($59,172)
Foreign currency translation adjustments	-84	8	-195	'
Comprehensive loss	($8,496)	($30,640)	($38,750)	($59,172)

Condensed_Consolidated_Stateme3

Condensed Consolidated Statements of Cash Flows (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jul. 31, 2014	Jul. 31, 2013
Cash flows from operating activities:	'	'
Net loss	($38,555)	($59,172)
Adjustments to reconcile net loss to net cash used in operating activities:	'	'
Depreciation and amortization	5,861	5,428
Gain on sale of PCIe product line	-17,448	'
Provision for excess and obsolete inventory	606	337
Accretion of interest cost	-194	134
Stock-based compensation	12,456	9,944
Changes in operating assets and liabilities, net:	'	'
Accounts receivable	8,995	-4,306
Inventory	2,972	-4,266
Other assets	-1,682	2,911
Accounts payable	-3,589	-1,387
Accrued liabilities	-16,008	1,873
Deferred revenue	-787	24,558
Net cash used in operating activities	-47,373	-23,946
Cash flows from investing activities:	'	'
Purchase of property and equipment	-3,572	-2,699
Proceeds from sale of PCIe product line	23,000	'
Increase in restricted cash	-2,300	'
Purchase of short-term investments	-11,214	'
Maturity of investments	47,195	'
Net cash provided by (used in) investing activities	53,109	-2,699
Cash flows from financing activities:	'	'
Proceeds from issuance of convertible notes	'	2,450
Proceeds from issuance of convertible preferred stock, net of issuance costs	'	21,258
Proceeds from debt and line of credit, net of issuance costs	17,326	20,078
Repayment of debt	-7,500	-191
Initial public offering expenses	'	-1,057
Proceeds from exercise of common stock options and restricted stock, net	2,416	192
Taxes paid related to net share settlement of equity awards	-3,212	'
Net cash provided by financing activities	9,030	42,730
Effect of exchange rates on cash and cash equivalents	-195	'
Net increase in cash and cash equivalents	14,571	16,085
Cash and cash equivalents at beginning of year	40,273	17,378
Cash and cash equivalents at end of period	54,844	33,463
Supplemental disclosure of other cash flow information:	'	'
Taxes paid	12	24
Interest paid	63	'
Supplemental disclosure of non-cash investing and financing activities:	'	'
Transfer of inventory to property and equipment	2,149	1,151
Vesting of early stock option exercises	$59	$91

Basis_of_Presentation_and_Summ

Basis of Presentation and Summary of Significant Accounting Policies	6 Months Ended
	Jul. 31, 2014
Accounting Policies [Abstract]	'
Basis of Presentation and Summary of Significant Accounting Policies	'
	1. Basis of Presentation and Summary of Significant Accounting Policies
	The accompanying condensed consolidated balance sheets and the condensed consolidated statements of operations, comprehensive loss and cash flows are unaudited. These unaudited interim condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (“SEC”) regarding interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. However, in the opinion of management, the financial statements include all the normal and recurring adjustments that are necessary to fairly present the results of the interim periods presented. As such, the information included in this Quarterly Report on Form 10-Q should be read in conjunction with the consolidated financial statements and accompanying notes included in the Company’s Annual Report on Form 10-K for the fiscal year ended January 31, 2014, filed with the SEC on April 16, 2014. The results of operations for the three and six months ended July 31, 2014 are not necessarily indicative of the results to be expected for any subsequent interim period, the year ending January 31, 2015 or any other future period.
	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 reverse stock split.
	The accompanying unaudited condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All significant intercompany accounts and transactions have been eliminated in consolidation.
	Summary of Significant Accounting Policies
	The Company’s significant accounting policies have been described in Note 1 to the consolidated financial statements included in the Company’s Annual Report on Form 10-K for the fiscal year ended January 31, 2014 filed with the SEC on April 16, 2014. With exception of the discussions below, there have been no changes to the Company’s significant accounting policies described in the Annual Report on Form 10-K that have had a material impact on the Company’s condensed consolidated financial statements and related notes.
	Sale of Assets
	In May 2014, the Company entered into an asset purchase agreement with SK Hynix Inc. (“SK Hynix”) to sell certain intellectual property rights and fixed assets related to its PCIe product line. As consideration, SK Hynix agreed to pay the Company $23.0 million and assumed certain employee-related liabilities of approximately $0.5 million. The transaction closed in July 2014, and the Company recorded a gain of $17.4 million after deducting from the aggregate consideration (i) compensation paid to the transferred workforce of $3.2 million, which includes $1.4 million of stock-based compensation, (ii) professional fees of $2.4 million and (iii) the net book value of the fixed assets sold of $0.5 million.
	Restricted Cash
	Pursuant to the asset purchase agreement with SK Hynix, the Company is required to maintain a balance of $2.3 million in an escrow account in support of certain guarantees the Company made to the purchaser as part of the transaction. The amount will be released from escrow in July 2015, net of any disbursements related to the covered guarantees.
	Recent Accounting Pronouncements
	In March 2013, the FASB issued an accounting standard update requiring an entity to release into net income the entire amount of a cumulative translation adjustment related to its investment in a foreign entity when as a parent it either sells a part or all of its investment in a foreign entity or no longer holds a controlling financial interest in a subsidiary or group of assets within a foreign entity. This accounting standard update was effective prospectively for the Company beginning in the first quarter of fiscal 2015. The adoption of this accounting standard update did not have a material impact on the Company’s condensed 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 became effective for the Company on February 1, 2014, and was applied prospectively to unrecognized tax benefits that existed at the effective date. The adoption of this new guidance did not have a material impact on the Company’s consolidated financial position, results of operations or cash flows.
	In April 2014, the FASB issued an accounting standard update that changes the criteria for reporting discontinued operations. Under the accounting standard update, a disposal of a component of an entity or a group of components of an entity is required to be reported in discontinued operations if the disposal represents a strategic shift that has, or will have, a major effect on an entity’s operations and financial results when either it qualifies as held for sale, disposed of by sale, or disposed of other than by sale. This accounting standard update will be effective for the Company beginning in the first quarter of fiscal 2016. The Company has determined that this pronouncement would not have had a material impact on the Company’s financial position or results of operations.
	In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, a converged standard on revenue recognition. The new pronouncement requires revenue recognition to depict the transfer of promised goods or services to customer in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance also specifies the accounting for some costs to obtain or fulfil a contract with a customer, as well as enhanced disclosure requirements. ASU 2014-9 is effective for annual reporting periods beginning after December 15, 2016, including interim reporting periods within that reporting periods. Early adoption is not permitted. The Company is currently in the process of evaluating the impact of the adoption will have on its consolidated financial statements.

Cash_Equivalents_and_ShortTerm

Cash Equivalents and Short-Term Investments	6 Months Ended
	Jul. 31, 2014
Cash And Cash Equivalents [Abstract]	'
Cash Equivalents and Short-Term Investments	'
	2. Cash Equivalents and Short-Term Investments
	The following is a summary of cash equivalents and short-term investments by type of instrument as of July 31, 2014 and January 31, 2014 (in thousands):
		31-Jul-14
		Amortized		Unrealized		Unrealized			Estimated
		Cost		Gains		Losses			Fair Value
	Money market funds	$	782	$	—	$	—		$	782
	Commercial paper		6,850		—		—			6,850
	Corporate debt securities		6,816		—		—			6,816
	U.S. government and agency obligations		6,303		—		—			6,303
	Municipal obligations		10,005		—		—			10,005
		$	30,756	$	—	$	—		$	30,756
	Reported as:
	Cash equivalents	$	7,631	$	—	$	—		$	7,631
	Short-term investments		23,125		—		—			23,125
		$	30,756	$	—	$	—		$	30,756
		31-Jan-14
		Amortized		Unrealized		Unrealized			Estimated
		Cost		Gains		Losses			Fair Value
	Money Market funds	$	15,229	$	—	$	—		$	15,229
	Commercial paper		19,097		—		—			19,097
	Corporate debt securities		8,134		4		(3	)		8,135
	U.S. government and agency obligations		29,130		5		(3	)		29,132
	Municipal obligations		18,434		8		—			18,442
		$	90,024	$	17	$	(6	)	$	90,035
	Reported as:
	Cash equivalents	$	30,929	$	—	$	—		$	30,929
	Short-term investments		59,095		17		(6	)		59,106
		$	90,024	$	17	$	(6	)	$	90,035
	All marketable securities are deemed by management to be available-for-sale and are reported at fair value. Net unrealized gains or losses that are not determined to be other-than-temporary are reported within stockholders’ equity on the Company’s condensed consolidated balance sheets as a component of accumulated comprehensive loss. Realized gains or losses are recorded based on the specific identification method. For the three months ended July 31, 2014, the Company’s realized gains or losses on short-term investments were not material.
	The amortized cost and fair value of investments held as of July 31, 2014, by contractual years-to-maturity, are as follows (in thousands):
		Amortized		Fair
		Cost		Value
	Due within one year	$	20,607	$	20,607
	Due within one to two years		2,518		2,518
		$	23,125	$	23,125
	Included in the tables above is accrued interest related to purchased investments of approximately $0.2 million as of July 31, 2014 and $0.3 million as of January 31, 2014, respectively.

Fair_Value_Measurements

Fair Value Measurements	6 Months Ended
	Jul. 31, 2014
Fair Value Disclosures [Abstract]	'
Fair Value Measurements	'
	3. Fair Value Measurements
	Assets Measured and Recorded at Fair Value on a Recurring Basis
	The Company measures its financial assets and liabilities at fair value. The inputs used in the valuation methodologies in measuring fair value are defined in the fair value hierarchy as follows:
	Level 1	Inputs are unadjusted quoted prices in active markets for identical assets or liabilities.
	Level 2	Inputs are quoted prices for similar assets and liabilities in active markets or inputs that are observable for the asset or liability, either directly or indirectly through market corroboration, for substantially the full term of the financial instrument.
	Level 3	Inputs are unobservable inputs based on the Company’s assumptions.
	A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement.
	The following tables present the fair value of our financial assets and liabilities using the above input categories (in thousands):
			31-Jul-14
			Level 1		Level 2		Level 3		Total
	Cash equivalents:
	Money market funds		$	782	$	—	$	—	$	782
	Corporate debt securities			—		6,816		—		6,816
	U.S. government and agency obligations			—		6,303		—		6,303
	Municipal obligations			—		10,005		—		10,005
	Commercial paper			—		6,850		—		6,850
			$	782	$	29,974	$	—	$	30,756
			31-Jan-14
			Level 1		Level 2		Level 3		Total
	Money market funds		$	15,229	$	—	$	—	$	15,229
	Corporate debt securities			—		8,135		—		8,135
	U.S. government and agency obligations			—		29,132		—		29,132
	Municipal obligations			—		18,442		—		18,442
	Commercial paper			—		19,097		—		19,097
			$	15,229	$	74,806	$	—	$	90,035
	Included in the tables above is accrued interest related to purchased investments of approximately $0.2 million as of July 31, 2014 and $0.3 million as of January 31, 2014, respectively.
	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. There have been no transfers between Level 1 and 2 during the three and six months ended July 31, 2014.
	Fair Value of Other Financial Instruments
	The carrying amounts of the Company’s accounts receivable, accounts payable, accrued liabilities and other liabilities approximate their fair value due to their short term maturities.

Balance_Sheet_Components

Balance Sheet Components	6 Months Ended
	Jul. 31, 2014
Organization Consolidation And Presentation Of Financial Statements [Abstract]	'
Balance Sheet Components	'
	4. Balance Sheet Components
	Accounts Receivable
	The following table shows the components of accounts receivable, net (in thousands):
			31-Jul-14			31-Jan-14
	Accounts receivable		$	12,100		$	21,248
	Allowance for doubtful accounts			(40	)		(193	)
			$	12,060		$	21,055
	Inventory
	The following table shows the components of inventory (in thousands):
			31-Jul-14			31-Jan-14
	Raw materials		$	12,479		$	15,326
	Finished goods			21,447			24,327
			$	33,926		$	39,653
	Property and equipment, net
	The following table shows the components of property and equipment (in thousands):
			31-Jul-14			31-Jan-14
	Laboratory equipment		$	25,696		$	22,854
	Computer hardware and software			11,408			11,440
	Office furniture			310			305
	Leasehold improvements			348			310
				37,762			34,909
	Less: accumulated depreciation			(25,901	)		(21,256	)
			$	11,861		$	13,653
	Depreciation expense (including amortization of leasehold improvements and intangibles) was $2.5 million and $2.9 million for the three months ended July 31, 2014 and 2013, respectively, and $5.5 million and $5.4 million for the six months ended July 31, 2014 and 2013, respectively.
	Accrued liabilities
	The following table shows the components of accrued liabilities (in thousands):
			31-Jul-14			31-Jan-14
	Compensation and benefits		$	10,040		$	10,805	*
	Customer advance from Toshiba (Note 9)			—			6,875
	Purchase commitments			2,401			6,661
	Restructuring charges			1,484			3,248
	Professional fees			3,160			4,635	*
	Warranty			1,245			1,223
	Other			2,176			3,868	*
			$	20,506		$	37,315
	*	Reflects the reclassification of certain amounts within total accrued liabilities as of January 31, 2014 from other accrued liabilities to compensation and benefits and professional fees.
	Accrued Warranty
	The following table is a reconciliation of the changes in the Company’s aggregate product warranty liability (in thousands):
			Six Months Ended July 31,
			2014			2013
	Balance, beginning of year		$	1,223		$	994
	Additions			712			868
	Settlements			(690	)		(562	)
	Balance, end of period		$	1,245		$	1,300
	Accumulated Other Comprehensive Income (Loss)
	The components of accumulated other comprehensive loss as of July 31, 2014 and January 31, 2014, net of tax, were as follows (in thousands):
			Foreign Currency			Net Unrealized			Total
			Translation			Gain (Loss) on
			Adjustments			Short-Term
						Investments
	Accumulated Other comprehensive income as of January 31, 2014		$	11		$	104		$	115
	Other comprehensive loss, net of tax			(195	)		—			(195	)
	Accumulated Other comprehensive income as of July 31, 2014		$	(184	)	$	104		$	(80	)
	The Company did not have any reclassifications out of accumulated other comprehensive income (loss) as of July 31, 2014 and January 31, 2014. The Company did not have any other-than-temporary loss on its available-for-sale securities for all periods presented.

Equity_Award_and_Employee_Comp

Equity Award and Employee Compensation Plans	6 Months Ended
	Jul. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Equity Award and Employee Compensation Plans	'
	5. Equity Award and Employee Compensation Plans
	The 2012 Stock Plan
	In November 2012, the Company’s stockholders approved the adoption of the of the 2012 Stock Incentive Plan (the “2012 Stock Plan”) as the successor plan to the 2005 Stock Plan effective at the completion of the Company’s initial public offering (“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 three to four years.
	Shares authorized under the 2012 Plan include 9,088,950 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 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. On February 1, 2014, the share reserve increased by 4,150,000, to an aggregate of 11,650,000 authorized under the plan. 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. In addition, during the six months ended July 31, 2014, the Company issued Inducement Awards totaling 6,250,000 outside of the 2012 Plan under the employee inducement award exemption under the New York Stock Exchange Listed Company Manual Rule 303A.08, to the Company’s CEO and certain key executives.
	The following table summarizes the stock option activity related to shares of common stock under the Company’s 2005, 2012 Plans as well as the Inducement Awards (in thousands, except per share data):
			Shares			Outstanding Options
			Available
			for Grant			Number of			Weighted-		Weighted-Average		Aggregate
						Options			Average		Remaining		Intrinsic
									Exercise Price		Contractual Life		Value (1)
											(in years)
	Balances, January 31, 2014			5,459			5,230		$	1.43		7.23	$	19,770
	Additional shares authorized (2)			10,400
	RSUs granted			(3,109	)
	Recovery of shares from net settlement			763
	RSUs cancelled/forfeited			2,586
	Options granted (2)			(9,011	)		9,011			3.97
	Options exercised						(1,501	)		1.01
	Options forfeited			254			(254	)		3.06
	Balances, July 31, 2014			7,342			12,486		$	3.28		7.69	$	49,445
	Options vested and expected to vest - July 31, 2014						10,752		$	3.16		7.7	$	42,577
	Options exercisable – July 31, 2014						3,488		$	1.54		7.33	$	13,812
	-1	Aggregate intrinsic value is based on the common stock price at each respective date presented.
	-2	Includes 4,150,000 shares added to the 2012 Plan and 6,250,000 shares related to options issued under Inducement Grant Stock Option Agreements.
	The weighted average grant date fair value of options granted during the quarter ended July 31, 2014 was $1.72 per share. The total intrinsic value of options exercised during the six months ended July 31, 2014 was $4.6 million.
	Restricted Stock Units
	The Company’s outstanding restricted stock units, or RSUs, vest upon the satisfaction of both a service condition and a liquidity condition. The service condition for the majority of these awards is satisfied over three to four years. The liquidity condition was settled with the Company’s IPO and was settled in March 2014. 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, 2014			15,077		$	6.09		$	56,990
	RSUs granted			3,109			3.73
	RSUs vested			(7,408	)		3.94
	RSUs cancelled/forfeited			(2,586	)		5.73
	Balance, July 31, 2014			8,192		$	5.67		$	32,439
	-1	Aggregate intrinsic value is based on the common stock price at each respective date presented.
	The aggregate intrinsic value of RSUs that vested during the six months ended July 31, 2014 amounted to $29.4 million.
	During the six months ended July 31, 2014, 3.7 million of RSUs for which the service condition was satisfied vested in March 2014 upon satisfaction of the liquidity condition. Under net settlement procedures applicable to the March 2014 vesting dates, approximately 786,000 RSUs were withheld to cover the required withholding tax, which is based on the value of the RSU on the applicable settlement date. The remaining amounts are delivered to the recipient as shares of the Company’s common stock.
	Non-employee Stock Options and Awards
	For the three and six months ended July 31, 2014, the Company did not grant any options to non-employees. For the three and six months ended July 31, 2013, the Company granted 5,000 stock options to a non-employee. For the three and six months ended July 31, 2014, the Company granted approximately 309,000 restricted shares of common stock to non-employees. For the three and six months ended July 31, 2013, the Company did not grant any restricted shares of common stock to non-employees.
	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”). Upon adoption a total of 1,000,000 shares were reserved for issuance under the 2012 Purchase Plan. 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. On February 1, 2014, pursuant to the provisions of the plan, the share reserved was increased by 600,000 shares to an aggregate of 1,600,000 shares reserved under the plan. 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	6 Months Ended
	Jul. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Stock-Based Compensation	'
	6. Stock-Based Compensation
	As of July 31, 2014, total stock-based compensation cost related to unvested equity awards not yet recognized, net of estimated forfeitures, totaled $36.9 million. The Company expects to recognize $6.8 million during the remainder of fiscal 2015, $12.4 million in fiscal 2016, $10.7 million in fiscal 2017, $6.2 million in fiscal 2018 and $0.8 million in fiscal 2019. There was no capitalized stock-based compensation expense for any period presented.
	Stock based compensation associated with non-employee awards was approximately $0.3 million and $0.2 million for the three months ended July 31, 2014 and 2013, respectively, and $0.5 million and $0.6 million for the six months ended July 31, 2014 and 2013, respectively.
	During the three months ended July 31, 2014, the Company accelerated vesting of certain options and RSU awards as a result of the Company’s restructuring initiatives and recognized incremental charges related to equity awards of approximately $1.4 million in the consolidated statement of operations.

Income_Taxes

Income Taxes	6 Months Ended
	Jul. 31, 2014
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	7. Income Taxes
	The Company’s quarterly provision for income taxes is based on an estimated effective annual income tax rate. The Company’s quarterly provision for income taxes also includes the tax impact of certain unusual or infrequently occurring items, if any, including changes in judgment about valuation allowances and effects of changes in tax laws or rates, in the interim period in which they occur.
	Income tax expense for the six months ended July 31, 2014 and 2013 was $36,000 and $27,000, respectively, and $30,000 and $7,000 for the three months ended July 31, 2014 and 2013, respectively. As of July 31, 2014, the income tax rate varies from the United States statutory income tax rate primarily due to valuation allowances in the United States and taxable income generated by the Company’s foreign wholly-owned subsidiaries.
	The Company has a full valuation allowance against its net operating loss carryforwards and research and development credits for both federal and state purposes. Utilization of the net operating loss carry forwards and credits may be subject to substantial annual limitations due to the ownership change limitations provided by the Internal Revenue Code of 1986, as amended, and similar state provisions. The annual limitations may result in the expiration of net operating loss carryforwards and credits before utilization.
	The Company reviews the likelihood that it will realize the benefit of its deferred tax assets and, therefore, the need for valuation allowances on a quarterly basis. There is no corresponding income tax benefit recognized with respect to losses incurred and no corresponding income tax expense recognized with respect to earnings generated in jurisdictions with a valuation allowance. This causes variability in the Company’s effective tax rate. The Company intends to maintain the valuation allowances until it is more likely than not that the net deferred tax assets will be realized.
	As of July 31, 2014, the Company had no unrecognized tax benefits that would affect the Company’s effective tax rate if recognized.

Commitments_and_Contingencies

Commitments and Contingencies	6 Months Ended
	Jul. 31, 2014
Commitments And Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	8. 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. In August 2014, the Company entered into a settlement agreement with Savvian, whereby the Company agreed to pay $2.0 million and issue common stock valued at $0.5 million in exchange for a full release. The Company had previously accrued professional fees of $1.8 million associated with an equity financing. As such, we accrued $0.7 million as a result of this settlement during the second quarter of fiscal 2015.
	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 four complaints have been consolidated into a single, putative class action, and lead co-lead plaintiffs have been appointed by the court. On March 28, 2014, a consolidated complaint was filed. The complaint purports to assert claims under the federal securities laws on behalf of purchasers of our common stock issued in the IPO, and seeks damages in an unspecified amount and other relief. On April 18, 2014, the defendants filed a motion to dismiss the complaint. The motion has been briefed and argued and now is before the court. It is not known when the court will rule on the motion.
	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 in both securities actions.
	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 July 31, 2014 and January 31, 2014.
	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.
	Operating Lease Commitments
	The Company leases office space under various non-cancelable operating leases that expire at various dates through fiscal 2018. Future minimum lease payments under the Company’s operating leases as of July 31, 2014, are as follows (in thousands):
	Fiscal years ending January 31:	Amount
	2015 (remaining)	$	2,192
	2016		3,896
	2017		3,615
	2018		294
		$	9,997
	Purchase Commitments
	The Company depends upon one 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 July 31, 2014, the Company had approximately $5.0 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 July 31, 2014, the remaining purchase commitment totaled $4.5 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 July 31, 2014, the remaining purchase commitment was $3.6 million.
	Advertising Commitment
	In June 2012, the Company entered into an agreement with the Forty Niners SC Stadium Company LLC, which was amended in April 2014. As part of the amended agreement, the Company will receive advertising and related benefits at the stadium in Santa Clara, California from 2014 through 2023 for $1.8 million per year over the 10-year term. The balance of the Company’s first payment of approximately $1.25 million is due in November 2014. There have been no amounts recognized in advertising expenses related to this agreement for the six months ended July 31, 2014, as the advertising activity is expected to be recognized over the periods benefited by the agreement once the stadium commences operations in the third quarter of fiscal 2015.
	Other Contingencies
	From time to time, the Company may become involved in legal proceedings or other claims and assessments arising in the ordinary course of business. The Company is not currently a party to any litigation matters, except as discussed above, which, individually or in the aggregate, are expected to have a material adverse effect on the Company’s business, financial condition or results of operations.

RelatedParty_Transactions

Related-Party Transactions	6 Months Ended
	Jul. 31, 2014
Related Party Transactions [Abstract]	'
Related-Party Transactions	'
	9. Related-Party Transactions
	Toshiba
	As of July 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 10% of the Company’s total common stock outstanding.
	In June 2011, the Company entered into a Sales Agreement with Toshiba pursuant to which the Company agreed to purchase at least 70% of its annual flash memory requirement from Toshiba.
	In July 2013, the Company signed an agreement with Toshiba for the development of PCIe cards and the sale of sample cards and received a prepayment of $16 million. The $16 million prepayment consisted of $8 million for services to be performed for the development of the PCIe cards and $8 million for the sale of sample PCIe cards and related support services. The Company retains all ownership of the intellectual property developed under the agreement. The Company applied ASC 605-25 to identify the deliverables. The Company concluded that the deliverables are development services, sample PCIe cards and support services for the sample PCIe cards. The Company recognized $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.
	For the three months ended April 30, 2014, the Company recognized an additional $1.0 million under the agreement related to development services performed. The remaining $5.8 million advance payment was repaid to Toshiba in May 2014 pursuant to the Mutual Termination of Contract Agreement between Toshiba and the Company.
	In addition to the development agreement, the Company recognized revenue of $0.4 million and $0.6 million related to the sale of Flash Memory Arrays and services to Toshiba during the three months ended July 31, 2014 and 2013, respectively, and $0.9 million and $2.2 million during the six months ended July 31, 2014 and 2013, respectively.
	The Company purchased $0.3 million and $6.0 million of NAND flash memory from Toshiba during the three months ended July 31, 2014 and 2013, respectively, and $5.9 million and $13.3 million during the six months ended July 31, 2014 and 2013, respectively.

Restructuring_Charges

Restructuring Charges	6 Months Ended
	Jul. 31, 2014
Restructuring And Related Activities [Abstract]	'
Restructuring Charges	'
	10. Restructuring 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. In July 2014, the Company sold its PCIe product line to SK Hynix for $23.0 million.
	The Company’s restructuring 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 be utilized over the remaining lease term.
	As of July 31, 2014, total restructuring charges incurred to date were $7.9 million, primarily relating to severance and benefits. Information related to the Company’s restructuring related activities for the six months ended July 31, 2014 is below (in thousands):
		Severance			Excess Facility			Other			Total
		and related			charges			Restructuring
		charges						Charges
	Balance January 31, 2014	$	2,371		$	511		$	366		$	3,248
	Restructuring provision		1,185			1,810			67			3,062
	Payments and other adjustments		(2,864	)		(455	)		(433	)		(3,752	)
	Balance July 31, 2014	$	692		$	1,866		$	—			2,558
	Less noncurrent portion											(1,074	)
	Current portion of restructuring accrual										$	1,484

Segment_Information_and_Custom

Segment Information and Customer Concentration	6 Months Ended
	Jul. 31, 2014
Segment Reporting [Abstract]	'
Segment Information and Customer Concentration	'
	11. Segment Information and Customer Concentration
	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):
	Revenue	Three Months Ended July 31,				Six Months Ended July 31,
		2014		2013		2014		2013
	Americas:
	United States	$	12,443	$	18,837	$	21,945	$	36,344
	Other Americas		34		196		331		209
			12,477		19,033		22,276		36,553
	Europe:
	United Kingdom		599		1,197		1,680		1,826
	Other Europe		3,070		1,885		6,563		4,008
			3,669		3,082		8,243		5,834
	Asia Pacific:		2,447		4,390		6,207		8,916
		$	18,593	$	26,505	$	36,726	$	51,303
	Property and Equipment	July 31, 2014		January 31, 2014
	United States	$	11,542	$	13,232
	Europe		313		415
	Asia Pacific		6		6
		$	11,861	$	13,653
	Concentrations
	For the three months ended July 31, 2014, two customers represented 13% and 10% of net revenue. For the six months ended July 31, 2013, one customer represented 12% of net revenue. No other single customer accounted for more than 10% of revenue in the three months ended July 31, 2013 or in the six months ended July 31, 2014. Revenue from the Company’s five largest customers for the three months ended July 31, 2014 and 2013 was 42% and 28%, respectively, and 30% and 33% during the six months ended July 31, 2014 and 2013, respectively. As a consequence of the limited number of customers and the concentrated nature of their purchases, the Company’s revenue, gross margin and operating results may fluctuate significantly from period to period and are difficult to estimate.
	At July 31, 2014, one customer represented 10% of the accounts receivable balance. At January 31, 2014, Commtech Innovative Solutions and Avnet Inc. represented 27% and 15% of accounts receivable, respectively.

Net_Loss_Per_Share

Net Loss Per Share	6 Months Ended
	Jul. 31, 2014
Earnings Per Share [Abstract]	'
Net Loss Per Share	'
	12. Net Loss Per Share
	Basic net loss per share is computed by dividing the net loss by the weighted-average number of shares of common stock outstanding during the period, less the weighted-average unvested common stock subject to repurchase or forfeiture. Diluted net loss per share is computed by giving effect to all potential shares of common stock, including preferred stock, stock options and warrants, to the extent dilutive. Basic and diluted net loss per share was the same for each period presented as the inclusion of all potential common shares outstanding would have been anti-dilutive. The following table sets forth the computation of historical basic and diluted net loss per share (in thousands, except per share data):
		Three Months Ended July 31,						Six Months Ended July 31,
		2014			2013			2014			2013
	Numerator:
	Net loss	$	(8,412	)	$	(30,648	)	$	(38,555	)	$	(59,172	)
	Denominator:
	Weighted-average common shares outstanding		91,432			15,690			88,879			15,682
	Less: Weighted-average unvested common shares subject to repurchase		22			183			40			257
	Weighted-average shares used to compute net loss per share, basic and diluted		91,410			15,507			88,839			15,425
	Net loss per share, basic and diluted	$	(0.09	)	$	(1.98	)	$	(0.43	)	$	(3.84	)
	Since the Company experienced losses for all periods presented, basic net loss per share is the same as diluted net loss per share for all periods. The following potential common stock equivalents that could potentially dilute net loss per share in the future were excluded from the computation of diluted net loss per share because including them would have been anti-dilutive for the periods presented (in thousands):
		Three Months Ended July 31,						Six Months Ended July 31,
		2014			2013			2014			2013
	Convertible preferred stock (on an as converted basis)		—			47,715			—			47,715
	Common stock subject to purchase		11			147			11			147
	Convertible loan		—			209			—			209
	Common stock warrants		84			67			84			67
	Shares subject to outstanding common stock options and restricted stock units		20,678			15,818			20,678			15,818
			20,773			63,956			20,773			63,956

Debt_and_Line_of_Credit

Debt and Line of Credit	6 Months Ended
	Jul. 31, 2014
Debt Disclosure [Abstract]	'
Debt and Line of Credit	'
	13. Debt and Line of Credit
	Debt Facility
	During May 2013, the Company entered into a $50.0 million debt arrangement with TriplePoint Capital LLC, or TriplePoint. The facility had first secured interest in substantially all of the Company’s assets and intellectual property other than $7.5 million of accounts receivable. The Company had 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 had an end-of-term payment, ranging from 0.50% to 14.00% of the principal amount depending on the duration of the loan. In May 2014, the facility was terminated.
	Short-term Borrowings
	Line of Credit: In July 2013, the Company entered into a $7.5 million line of credit with Comerica Bank. The Company could borrow up to 80% of its current U.S.-based receivables, or $7.5 million, whichever is lower. The line was secured against the Company’s accounts receivable and collections thereof as well as its intellectual property. The line bore interest of prime plus 1% (4.25% as of July 31, 2014). As of July 31, 2014, the Company had $7.5 million outstanding on its line of credit. In August 2014, the Company repaid all outstanding amounts under the line of credit and terminated the Loan and Security Agreement with Comerica. (See Note 14).
	Product Financing Arrangement: In July 2014, the Company entered into a managed inventory program to run through December 2014. Under the agreement, the Company gave title to 194,000 units of product to the counterparty for approximately $2.3 million. The Company is obligated to repurchase the product in five equal monthly installments, including predetermined transaction fees of between 4.5% and 6%. As of July 31, 2014, the outstanding balance is reflected as part of short-term borrowings on the condensed consolidated balance sheets.

Subsequent_Events

Subsequent Events	6 Months Ended
	Jul. 31, 2014
Subsequent Events [Abstract]	'
Subsequent Events	'
	14. Subsequent Events
	Silicon Valley Credit Agreement
	In August 2014, the Company entered into a $40.0 million credit facility with Silicon Valley Bank (“SVB”) that provides for a term loan of $10.0 million and a line of credit with a maximum commitment of $30.0 million. The Company’s obligations under the agreement are secured by a first priority security interest in substantially all of its assets.
	The term loan bears interest at a rate per annum equal to the sum of (i) the higher of (a) the prime rate and (b) the Federal Funds Effective Rate plus 0.50% (the “ABR”), plus (ii) 2.50%. The term loan is to be repaid in monthly installments of $278,000 beginning in October 2014 and ending in September 2017, subject to acceleration upon certain specified events of defaults.
	Borrowings under the line of credit will bear interest at a rate per annum of either (a) the sum of (i) the Eurodollar rate plus (ii) 5.00%, or (b) the sum of (i) ABR plus (ii) 2.00%. The line of credit expires in September 2017, subject to acceleration upon certain specified events of defaults. The Eurodollar rate is determined based on the London Interbank Offered Rate, or LIBOR plus a margin of 5.00%.
	Pursuant to this arrangement, the Company agreed to issue SVB a warrant to purchase 79,323 shares of its common stock, $0.0001 par value per share, at a price per share of $3.782. The warrant expires in August 2019.
	Comerica Loan Agreement Termination
	In August 2014, the Company terminated its Loan and Security Agreement with Comerica Bank.
	Settlement of Savvian Litigation
	In August 2014, the Company entered into a settlement agreement with Savvian whereby the Company agreed to pay Savvian $2.0 million and issue common stock valued at $0.5 million in exchange for a full release. The Company previously accrued professional fees of $1.8 million associated with an equity financing. As such, the Company accrued an additional $0.7 million as a result of the settlement during the quarter ended July 31, 2014.

Basis_of_Presentation_and_Summ1

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jul. 31, 2014
Accounting Policies [Abstract]	'
Summary of Significant Accounting Policies	'
	Summary of Significant Accounting Policies
	The Company’s significant accounting policies have been described in Note 1 to the consolidated financial statements included in the Company’s Annual Report on Form 10-K for the fiscal year ended January 31, 2014 filed with the SEC on April 16, 2014. With exception of the discussions below, there have been no changes to the Company’s significant accounting policies described in the Annual Report on Form 10-K that have had a material impact on the Company’s condensed consolidated financial statements and related notes.
Sale of Assets	'
	Sale of Assets
	In May 2014, the Company entered into an asset purchase agreement with SK Hynix Inc. (“SK Hynix”) to sell certain intellectual property rights and fixed assets related to its PCIe product line. As consideration, SK Hynix agreed to pay the Company $23.0 million and assumed certain employee-related liabilities of approximately $0.5 million. The transaction closed in July 2014, and the Company recorded a gain of $17.4 million after deducting from the aggregate consideration (i) compensation paid to the transferred workforce of $3.2 million, which includes $1.4 million of stock-based compensation, (ii) professional fees of $2.4 million and (iii) the net book value of the fixed assets sold of $0.5 million.
Restricted Cash	'
	Restricted Cash
	Pursuant to the asset purchase agreement with SK Hynix, the Company is required to maintain a balance of $2.3 million in an escrow account in support of certain guarantees the Company made to the purchaser as part of the transaction. The amount will be released from escrow in July 2015, net of any disbursements related to the covered guarantees.
Recent Accounting Pronouncements	'
	Recent Accounting Pronouncements
	In March 2013, the FASB issued an accounting standard update requiring an entity to release into net income the entire amount of a cumulative translation adjustment related to its investment in a foreign entity when as a parent it either sells a part or all of its investment in a foreign entity or no longer holds a controlling financial interest in a subsidiary or group of assets within a foreign entity. This accounting standard update was effective prospectively for the Company beginning in the first quarter of fiscal 2015. The adoption of this accounting standard update did not have a material impact on the Company’s condensed 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 became effective for the Company on February 1, 2014, and was applied prospectively to unrecognized tax benefits that existed at the effective date. The adoption of this new guidance did not have a material impact on the Company’s consolidated financial position, results of operations or cash flows.
	In April 2014, the FASB issued an accounting standard update that changes the criteria for reporting discontinued operations. Under the accounting standard update, a disposal of a component of an entity or a group of components of an entity is required to be reported in discontinued operations if the disposal represents a strategic shift that has, or will have, a major effect on an entity’s operations and financial results when either it qualifies as held for sale, disposed of by sale, or disposed of other than by sale. This accounting standard update will be effective for the Company beginning in the first quarter of fiscal 2016. The Company has determined that this pronouncement would not have had a material impact on the Company’s financial position or results of operations.
	In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, a converged standard on revenue recognition. The new pronouncement requires revenue recognition to depict the transfer of promised goods or services to customer in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The guidance also specifies the accounting for some costs to obtain or fulfil a contract with a customer, as well as enhanced disclosure requirements. ASU 2014-9 is effective for annual reporting periods beginning after December 15, 2016, including interim reporting periods within that reporting periods. Early adoption is not permitted. The Company is currently in the process of evaluating the impact of the adoption will have on its consolidated financial statements.
Fair Value Measurements	'
	The Company measures its financial assets and liabilities at fair value. The inputs used in the valuation methodologies in measuring fair value are defined in the fair value hierarchy as follows:
	Level 1	Inputs are unadjusted quoted prices in active markets for identical assets or liabilities.
	Level 2	Inputs are quoted prices for similar assets and liabilities in active markets or inputs that are observable for the asset or liability, either directly or indirectly through market corroboration, for substantially the full term of the financial instrument.
	Level 3	Inputs are unobservable inputs based on the Company’s assumptions.
	A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement.
Fair Value of Financial Instruments	'
	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. There have been no transfers between Level 1 and 2 during the three and six months ended July 31, 2014.
	Fair Value of Other Financial Instruments
	The carrying amounts of the Company’s accounts receivable, accounts payable, accrued liabilities and other liabilities approximate their fair value due to their short term maturities.
Income Taxes	'
	The Company’s quarterly provision for income taxes is based on an estimated effective annual income tax rate. The Company’s quarterly provision for income taxes also includes the tax impact of certain unusual or infrequently occurring items, if any, including changes in judgment about valuation allowances and effects of changes in tax laws or rates, in the interim period in which they occur.
	Income tax expense for the six months ended July 31, 2014 and 2013 was $36,000 and $27,000, respectively, and $30,000 and $7,000 for the three months ended July 31, 2014 and 2013, respectively. As of July 31, 2014, the income tax rate varies from the United States statutory income tax rate primarily due to valuation allowances in the United States and taxable income generated by the Company’s foreign wholly-owned subsidiaries.
	The Company has a full valuation allowance against its net operating loss carryforwards and research and development credits for both federal and state purposes. Utilization of the net operating loss carry forwards and credits may be subject to substantial annual limitations due to the ownership change limitations provided by the Internal Revenue Code of 1986, as amended, and similar state provisions. The annual limitations may result in the expiration of net operating loss carryforwards and credits before utilization.
	The Company reviews the likelihood that it will realize the benefit of its deferred tax assets and, therefore, the need for valuation allowances on a quarterly basis. There is no corresponding income tax benefit recognized with respect to losses incurred and no corresponding income tax expense recognized with respect to earnings generated in jurisdictions with a valuation allowance. This causes variability in the Company’s effective tax rate. The Company intends to maintain the valuation allowances until it is more likely than not that the net deferred tax assets will be realized.
Restructuring charges	'
	The Company’s restructuring 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 be utilized over the remaining lease term.
Operating segments	'
	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.

Cash_Equivalents_and_ShortTerm1

Cash Equivalents and Short-Term Investments (Tables)	6 Months Ended
	Jul. 31, 2014
Cash And Cash Equivalents [Abstract]	'
Cash Equivalents and Short-Term Investments by Type of Instrument	'
	The following is a summary of cash equivalents and short-term investments by type of instrument as of July 31, 2014 and January 31, 2014 (in thousands):
		31-Jul-14
		Amortized		Unrealized		Unrealized			Estimated
		Cost		Gains		Losses			Fair Value
	Money market funds	$	782	$	—	$	—		$	782
	Commercial paper		6,850		—		—			6,850
	Corporate debt securities		6,816		—		—			6,816
	U.S. government and agency obligations		6,303		—		—			6,303
	Municipal obligations		10,005		—		—			10,005
		$	30,756	$	—	$	—		$	30,756
	Reported as:
	Cash equivalents	$	7,631	$	—	$	—		$	7,631
	Short-term investments		23,125		—		—			23,125
		$	30,756	$	—	$	—		$	30,756
		31-Jan-14
		Amortized		Unrealized		Unrealized			Estimated
		Cost		Gains		Losses			Fair Value
	Money Market funds	$	15,229	$	—	$	—		$	15,229
	Commercial paper		19,097		—		—			19,097
	Corporate debt securities		8,134		4		(3	)		8,135
	U.S. government and agency obligations		29,130		5		(3	)		29,132
	Municipal obligations		18,434		8		—			18,442
		$	90,024	$	17	$	(6	)	$	90,035
	Reported as:
	Cash equivalents	$	30,929	$	—	$	—		$	30,929
	Short-term investments		59,095		17		(6	)		59,106
		$	90,024	$	17	$	(6	)	$	90,035
Amortized Cost and Fair Value of Investments	'
	The amortized cost and fair value of investments held as of July 31, 2014, by contractual years-to-maturity, are as follows (in thousands):
		Amortized		Fair
		Cost		Value
	Due within one year	$	20,607	$	20,607
	Due within one to two years		2,518		2,518
		$	23,125	$	23,125

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jul. 31, 2014
Fair Value Disclosures [Abstract]	'
Summary of Fair Value of Financial Assets and Liabilities	'
	The following tables present the fair value of our financial assets and liabilities using the above input categories (in thousands):
		31-Jul-14
		Level 1		Level 2		Level 3		Total
	Cash equivalents:
	Money market funds	$	782	$	—	$	—	$	782
	Corporate debt securities		—		6,816		—		6,816
	U.S. government and agency obligations		—		6,303		—		6,303
	Municipal obligations		—		10,005		—		10,005
	Commercial paper		—		6,850		—		6,850
		$	782	$	29,974	$	—	$	30,756
		31-Jan-14
		Level 1		Level 2		Level 3		Total
	Money market funds	$	15,229	$	—	$	—	$	15,229
	Corporate debt securities		—		8,135		—		8,135
	U.S. government and agency obligations		—		29,132		—		29,132
	Municipal obligations		—		18,442		—		18,442
	Commercial paper		—		19,097		—		19,097
		$	15,229	$	74,806	$	—	$	90,035

Balance_Sheet_Components_Table

Balance Sheet Components (Tables)	6 Months Ended
	Jul. 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):
			31-Jul-14			31-Jan-14
	Accounts receivable		$	12,100		$	21,248
	Allowance for doubtful accounts			(40	)		(193	)
			$	12,060		$	21,055
Schedule of Inventory Components	'
	The following table shows the components of inventory (in thousands):
			31-Jul-14			31-Jan-14
	Raw materials		$	12,479		$	15,326
	Finished goods			21,447			24,327
			$	33,926		$	39,653
Schedule of Components of Property and Equipment	'
	The following table shows the components of property and equipment (in thousands):
			31-Jul-14			31-Jan-14
	Laboratory equipment		$	25,696		$	22,854
	Computer hardware and software			11,408			11,440
	Office furniture			310			305
	Leasehold improvements			348			310
				37,762			34,909
	Less: accumulated depreciation			(25,901	)		(21,256	)
			$	11,861		$	13,653
Schedule of Components of Accrued Liabilities	'
	The following table shows the components of accrued liabilities (in thousands):
			31-Jul-14			31-Jan-14
	Compensation and benefits		$	10,040		$	10,805	*
	Customer advance from Toshiba (Note 9)			—			6,875
	Purchase commitments			2,401			6,661
	Restructuring charges			1,484			3,248
	Professional fees			3,160			4,635	*
	Warranty			1,245			1,223
	Other			2,176			3,868	*
			$	20,506		$	37,315
	*	Reflects the reclassification of certain amounts within total accrued liabilities as of January 31, 2014 from other accrued liabilities to compensation and benefits and professional fees.
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):
			Six Months Ended July 31,
			2014			2013
	Balance, beginning of year		$	1,223		$	994
	Additions			712			868
	Settlements			(690	)		(562	)
	Balance, end of period		$	1,245		$	1,300
Schedule of Accumulated Other Comprehensive Loss	'
	The components of accumulated other comprehensive loss as of July 31, 2014 and January 31, 2014, net of tax, were as follows (in thousands):
			Foreign Currency			Net Unrealized			Total
			Translation			Gain (Loss) on
			Adjustments			Short-Term
						Investments
	Accumulated Other comprehensive income as of January 31, 2014		$	11		$	104		$	115
	Other comprehensive loss, net of tax			(195	)		—			(195	)
	Accumulated Other comprehensive income as of July 31, 2014		$	(184	)	$	104		$	(80	)

Equity_Award_and_Employee_Comp1

Equity Award and Employee Compensation Plans (Tables)	6 Months Ended
	Jul. 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, 2012 Plans as well as the Inducement Awards (in thousands, except per share data):
			Shares			Outstanding Options
			Available
			for Grant			Number of			Weighted-		Weighted-Average		Aggregate
						Options			Average		Remaining		Intrinsic
									Exercise Price		Contractual Life		Value (1)
											(in years)
	Balances, January 31, 2014			5,459			5,230		$	1.43		7.23	$	19,770
	Additional shares authorized (2)			10,400
	RSUs granted			(3,109	)
	Recovery of shares from net settlement			763
	RSUs cancelled/forfeited			2,586
	Options granted (2)			(9,011	)		9,011			3.97
	Options exercised						(1,501	)		1.01
	Options forfeited			254			(254	)		3.06
	Balances, July 31, 2014			7,342			12,486		$	3.28		7.69	$	49,445
	Options vested and expected to vest - July 31, 2014						10,752		$	3.16		7.7	$	42,577
	Options exercisable – July 31, 2014						3,488		$	1.54		7.33	$	13,812
	-1	Aggregate intrinsic value is based on the common stock price at each respective date presented.
	-2	Includes 4,150,000 shares added to the 2012 Plan and 6,250,000 shares related to options issued under Inducement Grant Stock Option Agreements.
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, 2014			15,077		$	6.09		$	56,990
	RSUs granted			3,109			3.73
	RSUs vested			(7,408	)		3.94
	RSUs cancelled/forfeited			(2,586	)		5.73
	Balance, July 31, 2014			8,192		$	5.67		$	32,439
	-1	Aggregate intrinsic value is based on the common stock price at each respective date presented.
	The aggregate intrinsic value of RSUs that vested during the six months ended July 31, 2014 amounted to $29.4 million.

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	6 Months Ended
	Jul. 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 July 31, 2014, are as follows (in thousands):
	Fiscal years ending January 31:	Amount
	2015 (remaining)	$	2,192
	2016		3,896
	2017		3,615
	2018		294
		$	9,997

Restructuring_Charges_Tables

Restructuring Charges (Tables)	6 Months Ended
	Jul. 31, 2014
Restructuring And Related Activities [Abstract]	'
Information Related to Restructuring Activities	'
	Information related to the Company’s restructuring related activities for the six months ended July 31, 2014 is below (in thousands):
		Severance			Excess Facility			Other			Total
		and related			charges			Restructuring
		charges						Charges
	Balance January 31, 2014	$	2,371		$	511		$	366		$	3,248
	Restructuring provision		1,185			1,810			67			3,062
	Payments and other adjustments		(2,864	)		(455	)		(433	)		(3,752	)
	Balance July 31, 2014	$	692		$	1,866		$	—			2,558
	Less noncurrent portion											(1,074	)
	Current portion of restructuring accrual										$	1,484

Segment_Information_and_Custom1

Segment Information and Customer Concentration (Tables)	6 Months Ended
	Jul. 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):
	Revenue	Three Months Ended July 31,				Six Months Ended July 31,
		2014		2013		2014		2013
	Americas:
	United States	$	12,443	$	18,837	$	21,945	$	36,344
	Other Americas		34		196		331		209
			12,477		19,033		22,276		36,553
	Europe:
	United Kingdom		599		1,197		1,680		1,826
	Other Europe		3,070		1,885		6,563		4,008
			3,669		3,082		8,243		5,834
	Asia Pacific:		2,447		4,390		6,207		8,916
		$	18,593	$	26,505	$	36,726	$	51,303
	Property and Equipment	July 31, 2014		January 31, 2014
	United States	$	11,542	$	13,232
	Europe		313		415
	Asia Pacific		6		6
		$	11,861	$	13,653

Net_Loss_Per_Share_Tables

Net Loss Per Share (Tables)	6 Months Ended
	Jul. 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):
		Three Months Ended July 31,						Six Months Ended July 31,
		2014			2013			2014			2013
	Numerator:
	Net loss	$	(8,412	)	$	(30,648	)	$	(38,555	)	$	(59,172	)
	Denominator:
	Weighted-average common shares outstanding		91,432			15,690			88,879			15,682
	Less: Weighted-average unvested common shares subject to repurchase		22			183			40			257
	Weighted-average shares used to compute net loss per share, basic and diluted		91,410			15,507			88,839			15,425
	Net loss per share, basic and diluted	$	(0.09	)	$	(1.98	)	$	(0.43	)	$	(3.84	)
Schedule of Common Stock Equivalents Excluded from Computation of Diluted Net Loss Per Share	'
	The following potential common stock equivalents that could potentially dilute net loss per share in the future were excluded from the computation of diluted net loss per share because including them would have been anti-dilutive for the periods presented (in thousands):
		Three Months Ended July 31,						Six Months Ended July 31,
		2014			2013			2014			2013
	Convertible preferred stock (on an as converted basis)		—			47,715			—			47,715
	Common stock subject to purchase		11			147			11			147
	Convertible loan		—			209			—			209
	Common stock warrants		84			67			84			67
	Shares subject to outstanding common stock options and restricted stock units		20,678			15,818			20,678			15,818
			20,773			63,956			20,773			63,956

Basis_of_Presentation_and_Summ2

Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	1 Months Ended	6 Months Ended		0 Months Ended
In Millions, except Share data, unless otherwise specified	Jul. 31, 2014	Jul. 31, 2014	31-May-14	Sep. 12, 2013	Sep. 12, 2013	Sep. 12, 2013	Sep. 12, 2013
				Common Stock [Member]	Common Stock [Member]	Series D Preferred Stock [Member]	Convertible Preferred Stock [Member]
					Secondary Offering [Member]		Secondary Offering [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 reverse stock split.	'	'	'	'	'
Conversion of preferred stock, shares converted	'	'	'	'	'	2	2
Conversion of preferred stock, shares issued	'	'	'	1	1.016998402	'	'
Asset purchase agreement cash consideration	'	'	$23	'	'	'	'
Employee-related liabilities	'	'	0.5	'	'	'	'
Gain on sale of assets	17.4	'	'	'	'	'	'
Compensation paid to the transferred workforce	3.2	3.2	'	'	'	'	'
Compensation paid to the transferred workforce, stock-based compensation	1.4	'	'	'	'	'	'
Professional fees	2.4	'	'	'	'	'	'
Net book value of fixed assets sold	0.5	0.5	'	'	'	'	'
Asset purchase agreement, required balance in escrow account	'	'	$2.30	'	'	'	'
Period for releasing fund from escrow	'	'2015-07	'	'	'	'	'

Cash_Equivalents_and_ShortTerm2

Cash Equivalents and Short-Term Investments - Cash Equivalents and Short-Term Investments by Type of Instrument (Detail) (USD $)	Jul. 31, 2014	Jan. 31, 2014
In Thousands, unless otherwise specified
Cash and Cash Equivalents [Line Items]	'	'
Amortized Cost	$30,756	$90,024
Unrealized Gains	'	17
Unrealized Losses	'	-6
Estimated Fair Value	30,756	90,035
Money Market Funds [Member]	'	'
Cash and Cash Equivalents [Line Items]	'	'
Amortized Cost	782	15,229
Unrealized Gains	'	'
Unrealized Losses	'	'
Estimated Fair Value	782	15,229
Commercial Paper [Member]	'	'
Cash and Cash Equivalents [Line Items]	'	'
Amortized Cost	6,850	19,097
Unrealized Gains	'	'
Unrealized Losses	'	'
Estimated Fair Value	6,850	19,097
Corporate Debt Securities [Member]	'	'
Cash and Cash Equivalents [Line Items]	'	'
Amortized Cost	6,816	8,134
Unrealized Gains	'	4
Unrealized Losses	'	-3
Estimated Fair Value	6,816	8,135
U.S. Government and Agency Obligations [Member]	'	'
Cash and Cash Equivalents [Line Items]	'	'
Amortized Cost	6,303	29,130
Unrealized Gains	'	5
Unrealized Losses	'	-3
Estimated Fair Value	6,303	29,132
Municipal Obligations [Member]	'	'
Cash and Cash Equivalents [Line Items]	'	'
Amortized Cost	10,005	18,434
Unrealized Gains	'	8
Unrealized Losses	'	'
Estimated Fair Value	10,005	18,442
Cash Equivalents [Member]	'	'
Cash and Cash Equivalents [Line Items]	'	'
Amortized Cost	7,631	30,929
Unrealized Gains	'	'
Unrealized Losses	'	'
Estimated Fair Value	7,631	30,929
Short-term Investments [Member]	'	'
Cash and Cash Equivalents [Line Items]	'	'
Amortized Cost	23,125	59,095
Unrealized Gains	'	17
Unrealized Losses	'	-6
Estimated Fair Value	$23,125	$59,106

Cash_Equivalents_and_ShortTerm3

Cash Equivalents and Short-Term Investments - Amortized Cost and Fair Value of Investments (Detail) (USD $)	Jul. 31, 2014	Jan. 31, 2014
In Thousands, unless otherwise specified
Cash And Cash Equivalents [Abstract]	'	'
Amortized Cost, Due within one year	$20,607	'
Amortized Cost, Due within one to two years	2,518	'
Amortized Cost	23,125	'
Fair Value, Due within one year	20,607	'
Fair Value, Due within one to two years	2,518	'
Fair Value	$23,125	$59,106

Cash_Equivalents_and_ShortTerm4

Cash Equivalents and Short-Term Investments - Additional Information (Detail) (USD $)	Jul. 31, 2014	Jan. 31, 2014
In Millions, unless otherwise specified
Cash And Cash Equivalents [Abstract]	'	'
Accrued interest related to purchased investments	$0.20	$0.30

Fair_Value_Measurements_Summar

Fair Value Measurements - Summary of Fair Value of Financial Assets and Liabilities (Detail) (USD $)	Jul. 31, 2014	Jan. 31, 2014
In Thousands, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Total assets measured at fair value	$30,756	$90,035
Corporate Debt Securities [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Total assets measured at fair value	6,816	8,135
U.S. Government and Agency Obligations [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Total assets measured at fair value	6,303	29,132
Municipal Obligations [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Total assets measured at fair value	10,005	18,442
Money Market Funds [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Total assets measured at fair value	782	15,229
Commercial Paper [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Total assets measured at fair value	6,850	19,097
Level 1 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Total assets measured at fair value	782	15,229
Level 1 [Member] | Corporate Debt Securities [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Total assets measured at fair value	'	'
Level 1 [Member] | U.S. Government and Agency Obligations [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Total assets measured at fair value	'	'
Level 1 [Member] | Municipal Obligations [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Total assets measured at fair value	'	'
Level 1 [Member] | Money Market Funds [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Total assets measured at fair value	782	15,229
Level 1 [Member] | Commercial Paper [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Total assets measured at fair value	'	'
Level 2 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Total assets measured at fair value	29,974	74,806
Level 2 [Member] | Corporate Debt Securities [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Total assets measured at fair value	6,816	8,135
Level 2 [Member] | U.S. Government and Agency Obligations [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Total assets measured at fair value	6,303	29,132
Level 2 [Member] | Municipal Obligations [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Total assets measured at fair value	10,005	18,442
Level 2 [Member] | Money Market Funds [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Total assets measured at fair value	'	'
Level 2 [Member] | Commercial Paper [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Total assets measured at fair value	6,850	19,097
Level 3 [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Total assets measured at fair value	'	'
Level 3 [Member] | Corporate Debt Securities [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Total assets measured at fair value	'	'
Level 3 [Member] | U.S. Government and Agency Obligations [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Total assets measured at fair value	'	'
Level 3 [Member] | Municipal Obligations [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Total assets measured at fair value	'	'
Level 3 [Member] | Money Market Funds [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Total assets measured at fair value	'	'
Level 3 [Member] | Commercial Paper [Member]	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'
Total assets measured at fair value	'	'

Fair_Value_Measurements_Additi

Fair Value Measurements - Additional Information (Detail) (USD $)	Jul. 31, 2014	Jan. 31, 2014
In Millions, unless otherwise specified
Fair Value Disclosures [Abstract]	'	'
Accrued interest related to purchased investments	$0.20	$0.30
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	'

Balance_Sheet_Components_Sched

Balance Sheet Components - Schedule of Components of Accounts Receivable (Detail) (USD $)	Jul. 31, 2014	Jan. 31, 2014
In Thousands, unless otherwise specified
Receivables [Abstract]	'	'
Accounts receivable	$12,100	$21,248
Allowance for doubtful accounts	-40	-193
Accounts receivable, net	$12,060	$21,055

Balance_Sheet_Components_Sched1

Balance Sheet Components - Schedule of Inventory Components (Detail) (USD $)	Jul. 31, 2014	Jan. 31, 2014
In Thousands, unless otherwise specified
Inventory Disclosure [Abstract]	'	'
Raw materials	$12,479	$15,326
Finished goods	21,447	24,327
Inventory	$33,926	$39,653

Balance_Sheet_Components_Sched2

Balance Sheet Components - Schedule of Components of Property and Equipment (Detail) (USD $)	Jul. 31, 2014	Jan. 31, 2014
In Thousands, unless otherwise specified
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	$37,762	$34,909
Less: accumulated depreciation	-25,901	-21,256
Property and Equipment, net	11,861	13,653
Laboratory Equipment [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	25,696	22,854
Computer Hardware and Software [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	11,408	11,440
Office Furniture [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	310	305
Leasehold Improvements [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	$348	$310

Balance_Sheet_Components_Addit

Balance Sheet Components - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2014	Jul. 31, 2013	Jan. 31, 2014
Balance Sheet Components [Abstract]	'	'	'	'	'
Depreciation expense	$2,500,000	$2,900,000	$5,500,000	$5,400,000	'
Reclassifications out of accumulated other comprehensive income (loss)	'	'	0	'	0
Other-than-temporary loss on available-for-sale securities recognized	$0	'	$0	'	$0

Balance_Sheet_Components_Sched3

Balance Sheet Components - Schedule of Components of Accrued Liabilities (Detail) (USD $)	Jul. 31, 2014	Jan. 31, 2014	Jul. 31, 2013	Jan. 31, 2013
In Thousands, unless otherwise specified
Payables And Accruals [Abstract]	'	'	'	'
Compensation and benefits	$10,040	$10,805	'	'
Customer advance from Toshiba (Note 9)	0	6,875	'	'
Purchase commitments	2,401	6,661	'	'
Restructuring charges	1,484	3,248	'	'
Professional fees	3,160	4,635	'	'
Warranty	1,245	1,223	1,300	994
Other	2,176	3,868	'	'
Accrued liabilities	$20,506	$37,315	'	'

Balance_Sheet_Components_Sched4

Balance Sheet Components - Schedule of Reconciliation of Aggregate Product Warranty Liability (Detail) (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jul. 31, 2014	Jul. 31, 2013
Payables And Accruals [Abstract]	'	'
Balance, beginning of year	$1,223	$994
Additions	712	868
Settlements	-690	-562
Balance, end of period	$1,245	$1,300

Balance_Sheet_Components_Sched5

Balance Sheet Components - Schedule of Accumulated Other Comprehensive Loss (Detail) (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jul. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]	'
Accumulated Other comprehensive income, beginning balance	$115
Other comprehensive loss, net of tax	-195
Accumulated Other comprehensive income, ending balance	-80
Foreign Currency Translation Adjustments [Member]	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'
Accumulated Other comprehensive income, beginning balance	11
Other comprehensive loss, net of tax	-195
Accumulated Other comprehensive income, ending balance	-184
Net Unrealized Gain (Loss) on Short-Term Investments [Member]	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'
Accumulated Other comprehensive income, beginning balance	104
Other comprehensive loss, net of tax	'
Accumulated Other comprehensive income, ending balance	$104

Equity_Award_and_Employee_Comp2

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

6 Months Ended

6 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

In Millions, except Share data, unless otherwise specified

Jul. 31, 2014

Jan. 31, 2014

Jul. 31, 2014

Jul. 31, 2014

Jul. 31, 2014

Jul. 31, 2014

Jul. 31, 2014

Jul. 31, 2014

Jul. 31, 2014

Jul. 31, 2014

Jul. 31, 2014

Jul. 31, 2014

Jul. 31, 2014

Jul. 31, 2013

Jul. 31, 2014

Jul. 31, 2013

Employee 401(k) Plan [Member]

2012 Stock Plan [Member]

Inducement Grant Stock Option Agreements [Member]

Employee Stock Purchase Plan [Member]

Minimum [Member]

Maximum [Member]

Maximum [Member]

Restricted Stock Units (RSUs) [Member]

Restricted Stock Units (RSUs) [Member]

Restricted Stock Units (RSUs) [Member]

Non-Employee Options [Member]

Non-Employee Options [Member]

Non-Employee Options [Member]

Non-Employee Options [Member]

Period

2012 Stock Plan [Member]

2012 Stock Plan [Member]

Employee Stock Purchase Plan [Member]

Minimum [Member]

Maximum [Member]

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

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share awards and options expiration period

'

'

'

'7 years

'

'

'

'

'

'

'

'

'

'

'

'

Share awards and options vesting period

'

'

'

'

'

'

'3 years

'4 years

'

'

'

'

'

'

'

'

Percentage of stock appreciation rights granted

'

'

'

'

'

'

100.00%

'

'

'

'

'

'

'

'

'

Shares outstanding

12,486,000

5,230,000

'

9,088,950

'

'

'

'

'

'

'

'

'

'

'

'

Shares authorized

'

7,500,000

'

11,650,000

'

1,600,000

'

'

'

'

'

'

'

'

'

'

Increase in shares authorized reserve, description

'

'

'

'The reserve will automatically increase on the first day of each fiscal year 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.

'

'

'

'

'

'

'

'

'

'

'

'

Increased share reserve

'

'

'

4,150,000

'

600,000

'

'

'

'

'

'

'

'

'

'

Shares related to options issued

'

'

'

4,150,000

6,250,000

'

'

'

'

'

'

'

'

'

'

'

Weighted average grant date fair value of options granted

$1.72

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total intrinsic value of options exercised

$4.60

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Restricted stock units vesting period

'

'

'

'

'

'

'

'

'

'

'3 years

'4 years

'

'

'

'

Restricted stock units expected to vest

10,752,000

'

'

'

'

'

'

'

'

29,400,000

'

'

'

'

'

'

RSUs vested

7,408,000

'

'

'

'

'

'

'

'

3,700,000

'

'

'

'

'

'

Restricted stock units withheld to cover the required withholding tax

'

'

'

'

'

'

'

'

'

786,000

'

'

'

'

'

'

Share based compensation, Company granted option to purchase common stock

'

'

'

'

'

'

'

'

'

'

'

'

309,000

5,000

309,000

5,000

Share based compensation, Company granted option to purchase restricted stock

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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 $)	6 Months Ended	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Jul. 31, 2014	Jan. 01, 2014	Jan. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Shares Available for Grant, Beginning balance	5,459,000	'	'
Number of Options, RSUs granted	-3,109,000	'	'
Number of Options, RSUs cancelled/forfeited	2,586,000	'	'
Number of Options, Options granted	9,011,000	'	'
Number of Options, Options exercised	-1,501,000	'	'
Shares Available for Grant, Ending balance	7,342,000	'	'
Number of Options, Beginning balance	5,230,000	'	'
Number of Options, Additional shares authorized	'	'	7,500,000
Number of Options, Options forfeited	-254,000	'	'
Number of Options, Ending balance	12,486,000	'	'
Number of Options, Options vested and expected to vest	10,752,000	'	'
Number of Options, Options exercisable	3,488,000	'	'
Weighted-Average Exercise Price, Beginning balance	$1.43	'	'
Weighted-Average Exercise Price, Options granted	$3.97	'	'
Weighted-Average Exercise Price, Options exercised	$1.01	'	'
Weighted-Average Exercise Price, Options forfeited	$3.06	'	'
Weighted-Average Exercise Price, Ending balance	$3.28	'	'
Weighted-Average Exercise Price, Options vested and expected to vest	$3.16	'	'
Weighted-Average Exercise Price, Options exercisable	$1.54	'	'
Weighted-Average Remaining Contractual Life (in years)	'7 years 11 months 1 day	'7 years 2 months 23 days	'
Weighted-Average Remaining Contractual Life (in years), Options vested and expected to vest	'7 years 11 months 9 days	'	'
Weighted-Average Remaining Contractual Life (in years), Options exercisable	'7 years 3 months 7 days	'	'
Aggregate Intrinsic Value, Beginning balance	$19,770	'	'
Aggregate Intrinsic Value, Ending balance	49,445	'	'
Aggregate Intrinsic Value, Options vested and expected to vest	42,577	'	'
Aggregate Intrinsic Value, Options exercisable	$13,812	'	'
Shares Available for Grant [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Shares Available for Grant, Additional shares authorized	10,400,000	'	'
Number of Options, Options granted	-9,011,000	'	'
Shares Available for Grant, Options forfeited	254,000	'	'
Restricted Stock Units (RSUs) [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Number of Options, RSUs granted	'	'	'
Number of Options, RSUs cancelled/forfeited	'	'	'
Number of Options, Recovery of shares from net settlement	'	'	'
Number of Options, Options vested and expected to vest	29,400,000	'	'
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	-3,109,000	'	'
Shares Available for Grant, Recovery of shares from net settlement	763,000	'	'
Number of Options, RSUs cancelled/forfeited	2,586,000	'	'

Equity_Award_and_Employee_Comp4

Equity Award and Employee Compensation Plans - Summary of Stock Option Activity (Parenthetical) (Detail)	Jul. 31, 2014
2012 Stock Plan [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Shares related to options issued	4,150,000
Inducement Grant Stock Option Agreements [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Shares related to options issued	6,250,000

Equity_Award_and_Employee_Comp5

Equity Award and Employee Compensation Plans - Summary of Restricted Stock Units Activity (Detail) (USD $)	6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jul. 31, 2014	Jan. 01, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'	'
Number of RSUs Outstanding, Beginning balance	15,077	'
Number of RSUs Outstanding, granted	3,109	'
Number of RSUs Outstanding, vested	-7,408	'
Number of RSUs Outstanding, cancelled/forfeited	-2,586	'
Number of RSUs Outstanding, Ending balance	8,192	'
Weighted-Average Grant Date Fair Value, Beginning balance	$6.09	'
Weighted-Average Grant Date Fair Value, granted	$3.73	'
Weighted-Average Grant Date Fair Value, vested	$3.94	'
Weighted-Average Grant Date Fair Value, cancelled/forfeited	$5.73	'
Weighted-Average Grant Date Fair Value, Ending balance	$5.67	'
Aggregate Intrinsic Value	$32,439	$56,990

StockBased_Compensation_Additi

Stock-Based Compensation - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2014	Jul. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Stock-based compensation not yet recognized	$36.90	'	$36.90	'
Stock-based compensation not yet recognized, expects to amortize based upon equity awards outstanding in remainder of fiscal 2015	6.8	'	6.8	'
Stock-based compensation not yet recognized, expects to amortize based upon equity awards outstanding in fiscal 2016	12.4	'	12.4	'
Stock-based compensation not yet recognized, expects to amortize based upon equity awards outstanding in fiscal 2017	10.7	'	10.7	'
Stock-based compensation not yet recognized, expects to amortize based upon equity awards outstanding in fiscal 2018	'	'	6.2	'
Stock-based compensation not yet recognized, expects to amortize based upon equity awards outstanding in fiscal 2019	'	'	0.8	'
Capitalized stock-based compensation expense	'	'	0	'
Stock based compensation of non-employee awards	0.3	0.2	0.5	0.6
Non-Employees [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Additional share-based compensation expense	$1.40	'	'	'

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2014	Jul. 31, 2013
Income Tax Disclosure [Abstract]	'	'	'	'
Income tax expense	$30	$7	$36	$27
Unrecognized tax benefits	$0	'	$0	'

Commitments_and_Contingencies_1

Commitments and Contingencies - Additional Information (Detail) (USD $)

0 Months Ended

6 Months Ended

0 Months Ended

1 Months Ended

Nov. 26, 2013

Jul. 31, 2014

Jan. 31, 2014

Jul. 31, 2013

Jul. 31, 2012

Aug. 26, 2013

Jul. 31, 2014

Jul. 31, 2014

Aug. 31, 2014

Aug. 31, 2014

Jul. 31, 2014

Jan. 31, 2014

Jul. 31, 2014

Jul. 31, 2014

Lawsuits

Savvian Litigation [Member]

Savvian Litigation [Member]

Savvian Litigation [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Indemnification Agreement [Member]

Indemnification Agreement [Member]

Other Software Vendor [Member]

Software Vendor [Member]

Equity Financing [Member]

Savvian Litigation [Member]

Savvian Litigation [Member]

Equity Financing [Member]

Loss Contingencies [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Offering fees, payment sought

'

'

'

'

'

$10,000,000

'

'

'

'

'

'

'

'

Common stock value

'

9,000

8,000

'

'

'

'

'

500,000

'

'

'

'

'

Amount of litigation settlement

'

'

'

'

'

'

'

'

2,000,000

'

'

'

'

'

Accrued professional fees

'

3,160,000

4,635,000

'

'

'

700,000

1,800,000

700,000

1,800,000

'

'

'

'

Number of lawsuits filed

4

'

'

'

'

'

'

'

'

'

'

'

'

'

Class action filing date

'

26-Nov-13

'

'

'

'

'

'

'

'

'

'

'

'

Liabilities recorded for indemnification agreements

'

'

'

'

'

'

'

'

'

'

0

0

'

'

Outstanding purchase commitments

'

5,000,000

'

'

'

'

'

'

'

'

'

'

'

'

Purchase commitments obligations

'

'

'

12,000,000

5,000,000

'

'

'

'

'

'

'

'

'

Remaining purchase commitment

'

'

'

'

'

'

'

'

'

'

'

'

3,600,000

4,500,000

Advertising Commitment description

'

'In June 2012, the Company entered into an agreement with the Forty Niners SC Stadium Company LLC, which was amended in April 2014. As part of the amended agreement, the Company will receive advertising and related benefits at the stadium in Santa Clara, California from 2014 through 2023 for $1.8 million per year over the 10-year term.

'

'

'

'

'

'

'

'

'

'

'

'

Advertising commitment

'

1,800,000

'

'

'

'

'

'

'

'

'

'

'

'

Advertising commitment agreement term

'

'10 years

'

'

'

'

'

'

'

'

'

'

'

'

Advertising commitment first year's payments amount

'

1,250,000

'

'

'

'

'

'

'

'

'

'

'

'

Advertising expenses recognized

'

$0

'

'

'

'

'

'

'

'

'

'

'

'

Commitments_and_Contingencies_2

Commitments and Contingencies - Future Minimum Lease Payments under Operating Leases (Detail) (USD $)	Jul. 31, 2014
In Thousands, unless otherwise specified
Commitments And Contingencies Disclosure [Abstract]	'
2015	$2,192
2016	3,896
2017	3,615
2018	294
Total	$9,997

RelatedParty_Transactions_Addi

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

Jul. 31, 2014

Jan. 31, 2014

Jul. 31, 2013

Apr. 30, 2014

Jul. 31, 2014

Jun. 30, 2011

Jul. 31, 2014

Jul. 31, 2013

Jul. 31, 2014

Jul. 31, 2013

Jul. 31, 2014

Jul. 31, 2013

Jul. 31, 2014

Jul. 31, 2013

Jul. 31, 2013

Jan. 31, 2014

Jul. 31, 2013

Jan. 31, 2014

Share data in Thousands, unless otherwise specified

Toshiba Corporation [Member]

Toshiba Corporation [Member]

Toshiba Corporation [Member]

Toshiba Corporation [Member]

Toshiba Corporation [Member]

Toshiba Corporation [Member]

Toshiba Corporation [Member]

Toshiba Corporation [Member]

Toshiba Corporation [Member]

Toshiba Corporation [Member]

Toshiba Corporation [Member]

Toshiba Corporation [Member]

Toshiba Corporation [Member]

Toshiba Corporation [Member]

Toshiba Corporation [Member]

Toshiba Corporation [Member]

Flash Memory [Member]

Flash Memory Array and services[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]

NAND Flash Memory [Member]

Development of PCIe Cards [Member]

Development of PCIe Cards [Member]

Sample PCIe Cards [Member]

Sample PCIe Cards [Member]

Related Party Transaction [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock outstanding

83,057

83,057

'

'

9,200

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of common stock outstanding

'

'

'

'

10.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

Sales agreement purchase percentage

'

'

'

'

'

70.00%

'

'

'

'

'

'

'

'

'

'

'

'

Prepayment received from related party

'

'

$16,000,000

'

'

'

'

'

'

'

'

'

'

'

$8,000,000

'

$8,000,000

'

Revenue recognized related to development

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

6,000,000

'

3,100,000

Revenue recognized from related party

'

'

'

1,000,000

'

'

400,000

600,000

900,000

2,200,000

'

'

'

'

'

'

'

'

Remaining agreement value of advance payment

8,035,000

12,208,000

'

5,800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Termination date of agreement

'

'

'

'

'2014-05

'

'

'

'

'

'

'

'

'

'

'

'

'

Purchases from related party

'

'

'

'

'

'

'

'

'

'

$300,000

$6,000,000

$5,900,000

$13,300,000

'

'

'

'

Restructuring_Charges_Addition

Restructuring Charges - Additional Information (Detail) (USD $)	1 Months Ended	6 Months Ended
In Millions, unless otherwise specified	Jul. 31, 2014	Jul. 31, 2014
Reorganizations [Abstract]	'	'
Product line sold to SK Hynix	$23	'
Incurred restructuring charges	'	$7.90

Restructuring_Charges_Informat

Restructuring Charges - Information Related to Restructuring and Transition Related Activities (Detail) (USD $)	3 Months Ended	6 Months Ended
In Thousands, unless otherwise specified	Jul. 31, 2014	Jul. 31, 2014	Jan. 31, 2014
Restructuring Cost and Reserve [Line Items]	'	'	'
Restructuring and transition charges, beginning balance	'	$3,248	'
Restructuring provision	1,306	3,062	'
Payments and other adjustments	'	-3,752	'
Restructuring and transition charges, ending balance	2,558	2,558	'
Less noncurrent portion	-1,074	-1,074	'
Current portion of restructuring accrual	1,484	1,484	3,248
Severance and Related Charges [Member]	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'
Restructuring and transition charges, beginning balance	'	2,371	'
Restructuring provision	'	1,185	'
Payments and other adjustments	'	-2,864	'
Restructuring and transition charges, ending balance	692	692	'
Excess Facility Charges [Member]	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'
Restructuring and transition charges, beginning balance	'	511	'
Restructuring provision	'	1,810	'
Payments and other adjustments	'	-455	'
Restructuring and transition charges, ending balance	1,866	1,866	'
Other Restructuring Charges [Member]	'	'	'
Restructuring Cost and Reserve [Line Items]	'	'	'
Restructuring and transition charges, beginning balance	'	366	'
Restructuring provision	'	67	'
Payments and other adjustments	'	($433)	'

Segment_Information_and_Custom2

Segment Information and Customer Concentration - Additional Information (Detail)

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

12 Months Ended

Jul. 31, 2014

Jul. 31, 2013

Jul. 31, 2014

Jul. 31, 2013

Jul. 31, 2013

Jul. 31, 2013

Jul. 31, 2014

Jul. 31, 2014

Jul. 31, 2014

Jul. 31, 2014

Jul. 31, 2014

Jul. 31, 2013

Jul. 31, 2014

Jul. 31, 2013

Jul. 31, 2014

Jul. 31, 2013

Jul. 31, 2014

Jul. 31, 2013

Jan. 31, 2014

Jan. 31, 2014

Customer

Customer

Customer

Customer

Net Revenue [Member]

Net Revenue [Member]

Net Revenue [Member]

Accounts Receivable [Member]

Customer One [Member]

Customer Two [Member]

Largest Customers [Member]

Largest Customers [Member]

Largest Customers [Member]

Largest Customers [Member]

Largest Customers [Member]

Largest Customers [Member]

Largest Customers [Member]

Largest Customers [Member]

Commtech Innovative Solutions [Member]

Avnet Inc. [Member]

Segment

Minimum [Member]

Minimum [Member]

Net Revenue [Member]

Net Revenue [Member]

Customer

Customer

Customer

Customer

Net Revenue [Member]

Net Revenue [Member]

Net Revenue [Member]

Net Revenue [Member]

Accounts Receivable [Member]

Accounts Receivable [Member]

Segment Reporting Information [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of reportable segment

'

'

1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of operating segment

'

'

1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of customers

2

'

'

1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of customers represented

'

'

'

'

12.00%

10.00%

10.00%

10.00%

13.00%

10.00%

'

'

'

'

42.00%

28.00%

30.00%

33.00%

27.00%

15.00%

Number of single customer accounted for revenue

'

0

0

'

'

'

'

'

'

'

5

5

5

5

'

'

'

'

'

'

Number of single customer accounted for accounts receivable

'

'

1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Segment_Information_and_Custom3

Segment Information and Customer Concentration - Schedule of Revenue and Property and Equipment by Geographic Area (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2014	Jul. 31, 2013	Jan. 31, 2014
Segment Reporting Information [Line Items]	'	'	'	'	'
Total Revenue	$18,593	$26,505	$36,726	$51,303	'
Property and equipment, net	11,861	'	11,861	'	13,653
United States [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total Revenue	12,443	18,837	21,945	36,344	'
Property and equipment, net	11,542	'	11,542	'	13,232
Europe [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total Revenue	3,669	3,082	8,243	5,834	'
Property and equipment, net	313	'	313	'	415
Asia Pacific [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total Revenue	2,447	4,390	6,207	8,916	'
Property and equipment, net	6	'	6	'	6
Other Americas [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total Revenue	34	196	331	209	'
Americas [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total Revenue	12,477	19,033	22,276	36,553	'
United Kingdom [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total Revenue	599	1,197	1,680	1,826	'
Other Europe [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Total Revenue	$3,070	$1,885	$6,563	$4,008	'

Net_Loss_Per_Share_Schedule_of

Net Loss Per Share - Schedule of Computation of Historical Basic and Diluted Net Loss Per Share (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2014	Jul. 31, 2013
Numerator:	'	'	'	'
Net loss	($8,412)	($30,648)	($38,555)	($59,172)
Denominator:	'	'	'	'
Weighted-average common shares outstanding	91,432	15,690	88,879	15,682
Less: Weighted-average unvested common shares subject to repurchase	22	183	40	257
Weighted-average shares used to compute net loss per share, basic and diluted	91,410	15,507	88,839	15,425
Net loss per share, basic and diluted	($0.09)	($1.98)	($0.43)	($3.84)

Net_Loss_Per_Share_Schedule_of1

Net Loss Per Share - Schedule of Common Stock Equivalents Excluded from Computation of Diluted Net Loss Per Share (Detail)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2014	Jul. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'	'	'
Total common stock equivalents excluded from computation of diluted net loss per share	20,773	63,956	20,773	63,956
Common Stock Subject to Purchase [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	11	147	11	147
Convertible Loan [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	'	209	'	209
Common Stock Warrants [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	67	84	67
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	20,678	15,818	20,678	15,818
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	'	47,715	'	47,715

Debt_and_Line_of_Credit_Additi

Debt and Line of Credit - Additional Information (Detail) (USD $)

Jul. 31, 2014

Jan. 31, 2014

Jul. 31, 2014

Jul. 31, 2014

Jul. 31, 2014

31-May-13

Jul. 31, 2013

Jul. 31, 2014

Jul. 31, 2014

Jul. 31, 2014

Jul. 31, 2014

Jul. 31, 2014

Jul. 31, 2013

Product Financing Arrangement [Member]

Product Financing Arrangement [Member]

TriplePoint Capital, LLC [Member]

TriplePoint Capital, LLC [Member]

Comerica Bank [Member]

Comerica Bank [Member]

Minimum [Member]

Minimum [Member]

Maximum [Member]

Maximum [Member]

Maximum [Member]

Unit

Secured Debt [Member]

Secured Debt [Member]

Line of Credit [Member]

Line of Credit [Member]

Product Financing Arrangement [Member]

TriplePoint Capital, LLC [Member]

Product Financing Arrangement [Member]

TriplePoint Capital, LLC [Member]

Comerica Bank [Member]

Secured Debt [Member]

Secured Debt [Member]

Line of Credit [Member]

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

Credit facility, maximum borrowing capacity

'

'

'

'

'

$50,000,000

$7,500,000

'

'

'

'

'

'

Debt facility, collateral description

'

'

'

'

'The facility had 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

'

'

'

'

'

'

'

'

'

'3 months

'

'5 years

'

Debt instrument, interest rate, minimum

'

'

'

'

7.00%

'

'

'

'

'

'

'

'

Debt instrument, interest rate, maximum

'

'

'

'

13.50%

'

'

'

'

'

'

'

'

Debt instrument, interest rate at period end

'

'

'

'

'

'

'

'

'

0.50%

'

14.00%

'

Line of credit, borrowing capacity description

'

'

'

'

'

'

'

'The Company could 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, amount outstanding

'

'

'

'

'

'

'

7,500,000

'

'

'

'

'

Line of credit facility, interest rate spread

'

'

'

'

'

'

1.00%

'

'

'

'

'

'

Line of credit facility, interest rate at period end

'

'

'

'

'

'

'

4.25%

'

'

'

'

'

Units of product

'

'

194,000

'

'

'

'

'

'

'

'

'

'

Product financing

$9,826,000

'

$2,300,000

$2,300,000

'

'

'

'

'

'

'

'

'

Inventory repurchase description

'

'

'

'Five equal monthly installments

'

'

'

'

'

'

'

'

'

Transaction fees

'

'

'

'

'

'

'

'

4.50%

'

6.00%

'

'

Subsequent_Events_Additional_I

Subsequent Events - Additional Information (Detail) (USD $)	Jul. 31, 2014	Jan. 31, 2014	Jul. 31, 2014	Jul. 31, 2014	Aug. 31, 2014	Aug. 31, 2014	Aug. 31, 2014	Jul. 31, 2014	Jul. 31, 2014	Aug. 31, 2014	Aug. 31, 2014
			Savvian Litigation [Member]	Savvian Litigation [Member]	Subsequent Event [Member]	Subsequent Event [Member]	Subsequent Event [Member]	Silicon Valley Bank [Member]	Silicon Valley Bank [Member]	Silicon Valley Bank [Member]	Silicon Valley Bank [Member]
				Equity Financing [Member]		Savvian Litigation [Member]	Savvian Litigation [Member]		Term Loan [Member]	Subsequent Event [Member]	Subsequent Event [Member]
							Equity Financing [Member]				Term Loan [Member]
Subsequent Event [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Line of credit facility, amount outstanding	'	'	'	'	'	'	'	'	'	$40,000,000	'
Credit facility, term loan	'	'	'	'	'	'	'	'	'	10,000,000	'
Line of credit, maximum commitment	'	'	'	'	'	'	'	'	'	30,000,000	'
Line of credit facility, interest rate description	'	'	'	'	'	'	'	'Borrowings under the line of credit will bear interest at a rate per annum of either (a) the sum of (i) the Eurodollar rate plus (ii) 5.00%, or (b) the sum of (i) ABR plus (ii) 2.00%. The line of credit expires in September 2017, subject to acceleration upon certain specified events of defaults.	'The term loan bears interest at a rate per annum equal to the sum of (i) the higher of (a) the prime rate and (b) the Federal Funds Effective Rate plus 0.50% (the "ABR"), plus (ii) 2.50%.	'	'
Federal funds effective rate	'	'	'	'	'	'	'	'	'	'	0.50%
Line of credit facility, interest rate spread	'	'	'	'	'	'	'	'	'	2.00%	2.50%
Line of credit facility, periodic payment	'	'	'	'	'	'	'	'	'	'	278,000
Line of credit facility, frequency of payment	'	'	'	'	'	'	'	'	'Monthly	'	'
Line of credit facility, first payment date	'	'	'	'	'	'	'	'	31-Oct-14	'	'
Line of credit facility, last payment date	'	'	'	'	'	'	'	'	30-Sep-17	'	'
Line of credit facility, expiration date	'	'	'	'	'	'	'	'2017-09	'	'	'
Line of credit facility, Eurodollar rate	'	'	'	'	'	'	'	'	'	5.00%	'
Purchase of common stock	'	'	'	'	'	'	'	'	'	79,323	'
Warrant, expiration date	'	'	'	'	'	'	'	'	'	'2019-08	'
Common stock, par value	$0.00	$0.00	'	'	'	'	'	'	'	$0.00	'
Common stock, price per share	'	'	'	'	'	'	'	'	'	$3.78	'
Termination loans description	'	'	'	'	'In August 2014, the Company terminated its Loan and Security Agreement with Comerica Bank.	'	'	'	'	'	'
Common stock value	9,000	8,000	'	'	'	500,000	'	'	'	'	'
Settlement agreement with Savvian	'	'	'	'	'	2,000,000	'	'	'	'	'
Accrued professional fees	$3,160,000	$4,635,000	$700,000	$1,800,000	'	$700,000	$1,800,000	'	'	'	'