Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2016	May. 02, 2015
Cash flows from operating activities
Net loss	$ (8,098)	$ (382)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	6,178	5,294
Stock-based compensation	1,892	1,734
Provision for excess and obsolete inventory	101	1,071
(Recovery of) provision for sales returns, discounts and doubtful accounts	(402)	187
Deferred income taxes	$ (101)	(73)
Impairment of IP, mask sets and design tools		33
Tax effect related to share awards	$ 264	(712)
Excess tax (expense) benefit from stock-based compensation	(264)	$ 712
Impairment of privately-held investment	$ 300
Other non-cash activities		$ 32
Changes in operating assets and liabilities:
Accounts receivable	$ (7,441)	(5,335)
Inventory	2,300	(5,071)
Prepaid expenses and other current assets	(1,456)	(315)
Other non-current assets	19	4
Accounts payable	(2,043)	2,201
Accrued liabilities, compensation and related benefits	2,900	(807)
Income taxes payable	1,008	(3,363)
Other long-term liabilities	(19)	114
Net cash used in operating activities	(4,862)	$ (4,676)
Cash flows from investing activities
Restricted cash	$ 77
Purchases of marketable securities		$ (7,113)
Sales and maturities of marketable securities	$ 11	66
Purchases of software, equipment and leasehold improvements	(810)	(1,673)
Purchases of IP	(1,838)	(1,576)
Net cash used in investing activities	(2,560)	(10,296)
Cash flows from financing activities
Excess tax (expense) benefit from stock-based compensation	(264)	712
Proceeds from exercise of employee stock options and stock purchase rights	136	153
Net cash (used in) provided by financing activities	(128)	865
Effect of foreign exchange rate changes on cash and cash equivalents	88	(61)
Net decrease in cash and cash equivalents	(7,462)	(14,168)
Cash and cash equivalents, beginning of period	63,790	83,502
Cash and cash equivalents, end of period	56,328	69,334
Supplemental disclosure of cash flow information
Cash paid for income taxes	$ 383	$ 5,120