Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jul. 29, 2017	Jul. 30, 2016
Cash flows from operating activities:
Net loss	$ (27,536)	$ (9,820)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	8,347	11,579
Stock-based compensation	2,764	3,643
Provision for excess and obsolete inventory	897	683
Provision for (recovery of) sales returns, discounts and doubtful accounts	28	(13)
Deferred income taxes	(91)	(238)
Impairment of IP	3,006	300
Impairment of privately-held investment		886
Other non-cash activities	(391)	(472)
Changes in operating assets and liabilities:
Accounts receivable	10,884	(15,536)
Inventory	1,103	4,573
Prepaid expenses, other current and non-current assets	1,633	3,778
Accounts payable	1,452	(3,766)
Other long-term liabilities, accrued liabilities, compensation and related benefits	2,197	4,437
Income taxes payable	(5)	2,699
Net cash provided by operating activities	4,288	2,733
Cash flows from investing activities:
Restricted cash	(20)	82
Purchases of marketable securities	(645)
Sales and maturities of marketable securities and long-term investment	4,330	3,577
Purchases of software, equipment and leasehold improvements	(6,489)	(2,685)
Purchases of IP	(3,170)	(2,431)
Reimbursement of costs related to purchased IP		2,212
Net cash (used in) provided by investing activities	(5,994)	755
Cash flows from financing activities:
Net share settlement of equity awards issued to employees	(198)	(375)
Net proceeds from exercise of employee stock options and stock purchase rights	1,296	1,515
Net cash provided by financing activities	1,098	1,140
Effect of foreign exchange rate changes on cash and cash equivalents	95	(65)
Net (decrease) increase in cash and cash equivalents	(513)	4,563
Cash and cash equivalents, beginning of period	66,425	63,790
Cash and cash equivalents, end of period	65,912	68,353
Supplemental disclosure of cash flow information:
Cash paid for income taxes	$ 2,180	$ 654