Unaudited Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Aug. 02, 2014	Aug. 03, 2013
Cash flows from operating activities:
Net loss	$ (17,534)	$ (9,324)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation and amortization	10,706	10,272
Stock-based compensation	2,873	3,719
Provision for excess and obsolete inventory	1,268	575
(Release of) provision for sales returns, discounts and doubtful accounts	(13)	62
Deferred income taxes	(29)	2,913
Gain on sale of development project		(1,079)
Impairment of IP, mask sets and design tools	1,266	188
Tax effect related to stock options	(620)
Excess tax expense from stock- based compensation	620
Non-cash restructuring charges		830
Impairment of investment	601
Other non-cash activities	5	(6)
Changes in operating assets and liabilities:
Accounts receivable	2,868	(17,448)
Inventory	(1,170)	4,325
Prepaid expenses and other current and non-current assets	1,134	2,331
Accounts payable	190	13,809
Accrued liabilities, compensation and related benefits	174	1,915
Income taxes payable	(3,823)	(991)
Other long-term liabilities	(2,425)	(347)
Net cash (used in) provided by operating activities	(3,909)	11,744
Cash flows from investing activities:
Restricted cash	235	(2)
Purchases of marketable securities		(7,874)
Sales and maturities of marketable securities	11,030	7,641
Purchases of software, equipment and leasehold improvements	(3,012)	(4,995)
Proceeds from sale of development project, net of transaction fees		1,971
Repayment of note receivable	230	250
Purchases of IP	(1,553)	(4,099)
Net cash provided by (used in) investing activities	6,930	(7,108)
Cash flows from financing activities:
Excess tax benefit from stock-based compensation	1,242
Net proceeds from exercises of employee stock options and stock purchase rights	1,247	1,447
Net cash provided by financing activities	2,489	1,447
Effect of foreign exchange rate changes on cash and cash equivalents	12	(160)
Net increase in cash and cash equivalents	5,522	5,923
Cash and cash equivalents, beginning of period	64,326	51,218
Cash and cash equivalents, end of period	69,848	57,141
Supplemental disclosure of cash flow information:
Cash paid for income taxes	$ 4,777	$ 3,215