Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)	6 Months Ended
	Aug. 01, 2015	Aug. 02, 2014
Cash flows from operating activities:
Net loss	$ (86,000)	$ (17,534,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	10,496,000	10,706,000
Stock-based compensation	2,989,000	2,873,000
Provision for excess and obsolete inventory	1,619,000	1,268,000
Provision for (recovery of) sales returns, discounts and doubtful accounts	594,000	(13,000)
Deferred income taxes	(104,000)	(29,000)
Impairment of IP, mask sets and design tools	988,000	1,266,000
Tax effect related to share awards	(39,000)	(620,000)
Excess tax expense from stock-based compensation	39,000	620,000
Impairment of investment	132,000	601,000
Other non-cash activities	16,000	5,000
Changes in operating assets and liabilities:
Accounts receivable	(12,628,000)	2,868,000
Inventory	(11,867,000)	(1,170,000)
Prepaid expenses and other current assets	199,000	1,066,000
Other non-current assets	16,000	68,000
Accounts payable	6,151,000	190,000
Accrued liabilities, compensation and related benefits	(3,729,000)	174,000
Income taxes payable	(3,080,000)	(3,823,000)
Other long-term liabilities	256,000	(2,425,000)
Net cash used in operating activities	$ (8,038,000)	(3,909,000)
Cash flows from investing activities:
Restricted cash		$ 235,000
Purchases of marketable securities	$ (7,113,000)
Sales and maturities of marketable securities	111,000	$ 11,030,000
Purchases of software, equipment and leasehold improvements	(3,474,000)	(3,012,000)
Purchases of IP	$ (2,404,000)	(1,553,000)
Repayment of note receivable		230,000
Net cash (used in) provided by investing activities	$ (12,880,000)	6,930,000
Cash flows from financing activities:
Excess tax benefit from stock-based compensation	39,000	1,242,000
Net proceeds from exercises of employee stock options and stock purchase rights	2,744,000	1,247,000
Net cash provided by financing activities	2,783,000	2,489,000
Effect of foreign exchange rate changes on cash and cash equivalents	(128,000)	12,000
Net (decrease) increase in cash and cash equivalents	(18,263,000)	5,522,000
Cash and cash equivalents, beginning of period	83,502,000	64,326,000
Cash and cash equivalents, end of period	65,239,000	69,848,000
Supplemental disclosure of cash flow information:
Cash paid for income taxes	$ 6,226,000	$ 4,777,000