Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jul. 30, 2016	Aug. 01, 2015
Cash flows from operating activities:
Net loss	$ (9,820)	$ (86)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	11,579	10,496
Stock-based compensation	3,643	2,989
Provision for excess and obsolete inventory	683	1,619
(Recovery of) provision for sales returns, discounts and doubtful accounts	(13)	594
Deferred income taxes	(238)	(104)
Impairment of IP, mask sets and design tools	300	988
Tax effect related to share awards	375	(39)
Excess tax benefit from stock-based compensation	(375)	39
Impairment of investment	886	132
Other non-cash activities	(472)	16
Changes in operating assets and liabilities:
Accounts receivable	(15,536)	(12,628)
Inventory	4,573	(11,867)
Prepaid expenses and other current assets	4,377	199
Other non-current assets	(599)	16
Accounts payable	(3,766)	6,151
Accrued liabilities, compensation and related benefits	4,478	(3,729)
Income taxes payable	2,699	(3,080)
Other long-term liabilities	(41)	256
Net cash provided by (used in) operating activities	2,733	(8,038)
Cash flows from investing activities:
Restricted cash	82
Purchases of marketable securities		(7,113)
Sales and maturities of marketable securities	3,577	111
Purchases of software, equipment and leasehold improvements	(2,685)	(3,474)
Purchases of IP	(2,431)	(2,404)
Reimbursement of costs related to purchased IP	2,212
Net cash provided by (used in) investing activities	755	(12,880)
Cash flows from financing activities:
Excess tax (expense) benefit from stock-based compensation	(375)	39
Proceeds from exercises of employee stock options and stock purchase rights	1,515	2,744
Net cash provided by financing activities	1,140	2,783
Effect of foreign exchange rate changes on cash and cash equivalents	(65)	(128)
Net increase (decrease) in cash and cash equivalents	4,563	(18,263)
Cash and cash equivalents, beginning of period	63,790	83,502
Cash and cash equivalents, end of period	68,353	65,239
Supplemental disclosure of cash flow information:
Cash paid for income taxes	$ 654	$ 6,226