Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Feb. 01, 2014	Feb. 02, 2013	Jan. 28, 2012
Cash flows from operating activities
Net loss	$ (11,049)	$ (101,768)	$ (168,045)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	20,154	23,870	28,952
Stock-based compensation	6,814	10,595	12,025
Provision for excess and obsolete inventory	758	7,053	8,955
Provision for (recovery of) sales returns, discounts, and doubtful accounts	6	(158)	54
Deferred income taxes	4,129	12,398	(10,221)
Loss (gain) on disposal of software, equipment and leasehold improvements	21	(437)	173
Gain on acquisition		(1,389)
Gain on sale of development project	(1,079)
Gain on sale of privately-held investment	(137)
Non-cash restructuring costs		2,111
Tax effect related to stock options	(682)	(345)	1,595
Excess tax (benefit) expense from stock-based compensation	682	345	(1,938)
Accretion of contributed leasehold improvements	(30)	(206)	(260)
Impairment of goodwill, intangibles, IP, mask sets, design tools and other assets	1,425	11,174	111,278
Impairment loss on privately-held investment	570	0	0
Changes in operating assets and liabilities:
Accounts receivable	(6,006)	13,100	10,114
Inventory	3,767	3,699	6,964
Prepaid expenses and other current assets	3,932	1,268	(443)
Other non-current assets	(133)	(3,954)	156
Accounts payable	6,698	4,473	(7,968)
Accrued liabilities, compensation and related benefits	(7,739)	1,391	(4,114)
Income taxes payable and other long-term liabilities	(667)	2,135	577
Net cash provided by (used in) operating activities	21,434	(14,645)	(12,146)
Cash flows from investing activities
Restricted cash			(153)
Purchases of marketable securities	(17,771)	(21,354)	(88,072)
Sales and maturities of marketable securities	25,930	94,043	88,515
Purchases of software, equipment and leasehold improvements	(16,989)	(5,804)	(6,865)
Purchases of IP	(4,868)	(11,825)	(7,374)
Proceeds from sale of development project, net of transaction fees	1,971
Proceeds from sale of privately-held investment	2,137
Net cash paid in connection with acquisitions		(38,210)	(5,000)
Purchases of long-term investments			(2,142)
Repayment of note receivable	450	250	150
Purchase of notes receivable			(2,500)
Net cash provided by (used in) investing activities	(9,140)	17,100	(23,441)
Cash flows from financing activities
Net proceeds from exercise of employee stock options and stock purchase rights	2,622	4,574	5,377
Excess tax benefit (expense) from stock-based compensation	682	(345)	1,938
Repurchase of common stock	(2,257)
Net cash provided by financing activities	1,047	4,229	7,315
Effect of foreign exchange rate changes on cash and cash equivalents	(233)	251	(177)
Net increase (decrease) in cash and cash equivalents	13,108	6,935	(28,449)
Cash and cash equivalents, beginning of period	51,218	44,283	72,732
Cash and cash equivalents, end of period	64,326	51,218	44,283
Supplemental disclosure of cash flow information
Cash paid for income taxes	$ 6,093	$ 2,673	$ 1,330