Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Jan. 31, 2015	Feb. 01, 2014	Feb. 02, 2013
Net revenue	$ 188,313us-gaap_SalesRevenueNet	$ 199,193us-gaap_SalesRevenueNet	$ 216,613us-gaap_SalesRevenueNet
Cost of revenue	92,967us-gaap_CostOfRevenue	91,052us-gaap_CostOfRevenue	125,588us-gaap_CostOfRevenue
Gross profit	95,346us-gaap_GrossProfit	108,141us-gaap_GrossProfit	91,025us-gaap_GrossProfit
Operating expenses
Research and development	67,482us-gaap_ResearchAndDevelopmentExpense	73,162us-gaap_ResearchAndDevelopmentExpense	103,478us-gaap_ResearchAndDevelopmentExpense
Sales and marketing	22,290us-gaap_SellingAndMarketingExpense	21,637us-gaap_SellingAndMarketingExpense	34,550us-gaap_SellingAndMarketingExpense
General and administrative	19,641us-gaap_GeneralAndAdministrativeExpense	19,640us-gaap_GeneralAndAdministrativeExpense	27,899us-gaap_GeneralAndAdministrativeExpense
Restructuring costs	999us-gaap_RestructuringCharges	2,261us-gaap_RestructuringCharges	3,264us-gaap_RestructuringCharges
Impairment of IP, mask sets and design tools	2,811	1,013	6,569
Gain on acquisition			(1,389)
Total operating expenses	113,223us-gaap_OperatingExpenses	117,713us-gaap_OperatingExpenses	174,371us-gaap_OperatingExpenses
Loss from operations	(17,877)us-gaap_OperatingIncomeLoss	(9,572)us-gaap_OperatingIncomeLoss	(83,346)us-gaap_OperatingIncomeLoss
Gain on sale of development project		1,079us-gaap_GainLossOnSaleOfProject
Impairment, net of gain on sale, of privately-held investments, net	(602)	(433)
Interest and other income, net	1,771us-gaap_NonoperatingIncomeExpense	827us-gaap_NonoperatingIncomeExpense	2,325us-gaap_NonoperatingIncomeExpense
Loss before income taxes	(16,708)	(8,099)	(81,021)
Provision for income taxes	4,993us-gaap_IncomeTaxExpenseBenefit	2,950us-gaap_IncomeTaxExpenseBenefit	20,747us-gaap_IncomeTaxExpenseBenefit
Net loss	$ (21,701)us-gaap_NetIncomeLoss	$ (11,049)us-gaap_NetIncomeLoss	$ (101,768)us-gaap_NetIncomeLoss
Net loss per common share:
Basic (in Dollars per share)	$ (0.63)us-gaap_EarningsPerShareBasic	$ (0.32)us-gaap_EarningsPerShareBasic	$ (3.06)us-gaap_EarningsPerShareBasic
Diluted (in Dollars per share)	$ (0.63)us-gaap_EarningsPerShareDiluted	$ (0.32)us-gaap_EarningsPerShareDiluted	$ (3.06)us-gaap_EarningsPerShareDiluted
Shares used in computing net loss per share:
Basic (in Shares)	34,693	34,206	33,205
Diluted (in Shares)	34,693	34,206	33,205

This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment net of gain on sale of privately held investments, net.

No definition available.