Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Oct. 29, 2016	Oct. 31, 2015
Cash flows from operating activities:
Net (loss) income	$ (9,599)	$ 6,349
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	16,800	15,691
Stock-based compensation	5,136	4,880
Provision for excess and obsolete inventory	1,221	2,252
(Recovery of) provision for sales returns, discounts and doubtful accounts	(123)	727
Deferred income taxes	(363)	(216)
Impairment of IP, mask sets and design tools	300	1,783
Impairment of investment	886	132
Other non-cash activities	(799)	(267)
Changes in operating assets and liabilities:
Accounts receivable	(19,134)	(5,283)
Inventory	5,304	(9,760)
Prepaid expenses and other current assets	4,855	98
Other non-current assets	(592)	(5,953)
Accounts payable	(6,988)	4,321
Accrued liabilities, compensation and related benefits	5,031	(4,482)
Income taxes payable	4,177	(1,425)
Other long-term liabilities	(60)	910
Net cash provided by operating activities	6,052	9,757
Cash flows from investing activities:
Restricted cash	584
Purchases of marketable securities		(22,622)
Sales and maturities of marketable securities	3,582	5,050
Purchases of software, equipment and leasehold improvements	(7,847)	(5,551)
Purchases of IP	(5,670)	(2,750)
Reimbursement of costs related to purchased IP	2,645
Net cash received in connection with acquisition	289
Issuance of short-term promissory notes		(2,710)
Net cash used in investing activities	(6,417)	(28,583)
Cash flows from financing activities:
Employee payroll taxes paid related to net share settlement of restricted stock units	(528)	(81)
Proceeds from exercises of employee stock options and stock purchase rights	2,133	2,752
Net cash provided by financing activities	1,605	2,671
Effect of foreign exchange rate changes on cash and cash equivalents	(197)	(183)
Net increase (decrease) in cash and cash equivalents	1,043	(16,338)
Cash and cash equivalents, beginning of period	63,790	83,502
Cash and cash equivalents, end of period	64,833	67,164
Supplemental disclosure of cash flow information:
Cash paid for income taxes	$ 1,329	$ 7,335