CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 29, 2019	Mar. 30, 2018
Cash flows from operating activities:
Net loss	$ (11,306)	$ (13,694)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Amortization of intangibles	2,083	2,099
Depreciation	2,846	3,456
Stock-based compensation	2,113	5,757
Amortization of discount on convertible debt and issuance cost	1,605	1,453
Amortization of non-cash warrant	25	111
Restructuring, asset impairment and loss on retirement of fixed assets	103	40
Deferred income taxes, net	(538)	0
Foreign currency adjustments	(638)	835
Provision for excess and obsolete inventories	254	458
Allowance for doubtful accounts and returns	417	1,122
Other non-cash adjustments, net	287	132
Changes in operating assets and liabilities:
Accounts receivable	22,351	(5,925)
Inventories	(4,157)	424
Prepaid expenses and other assets	1,417	(6,511)
Accounts payable	(8,177)	(5,710)
Deferred revenue	4,750	10,009
Income taxes payable	(192)	253
Accrued and other liabilities	(9,027)	(933)
Net cash provided by (used in) operating activities	4,216	(6,624)
Cash flows from investing activities:
Purchases of property and equipment	(1,674)	(1,775)
Net cash used in investing activities	(1,674)	(1,775)
Cash flows from financing activities:
Proceeds from other debts and finance leases	160	0
Repayment of other debts and finance leases	(97)	(448)
Proceeds from common stock issued to employees	2,012	2,347
Payment of tax withholding obligations related to net share settlements of restricted stock units	(657)	0
Net cash provided by financing activities	1,418	1,899
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(33)	73
Net increase (decrease) in cash, cash equivalents and restricted cash	3,927	(6,427)
Cash, cash equivalents and restricted cash at beginning of period	65,989	58,757
Cash, cash equivalents and restricted cash at end of period	69,916	52,330
Supplemental disclosures of cash flow information:
Income tax payments, net	490	586
Interest payments, net	92	148
Supplemental schedule of non-cash investing and financing activities:
Capital expenditures incurred but not yet paid	91	325
Reconciliation of cash, cash equivalents, and restricted cash to the condensed consolidated balance sheets
Total cash, cash equivalents and restricted cash	$ 65,989	$ 58,757