CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jul. 02, 2021	Jun. 26, 2020
Cash flows from operating activities:
Net loss	$ (8,133)	$ (37,355)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation	6,164	5,535
Amortization of intangibles	507	2,462
Stock-based compensation	12,429	9,807
Amortization of convertible debt discount	3,093	3,785
Amortization of warrant	863	868
Foreign currency remeasurement	(1,897)	(89)
Loss on convertible debt extinguishment	0	834
Deferred income taxes	981	1,116
Provision for expected credit losses and returns	2,230	662
Provision for excess and obsolete inventories	1,004	723
Other adjustments	111	207
Changes in operating assets and liabilities:
Accounts receivable	(36,709)	13,024
Inventories	(8,825)	(4,032)
Other assets	882	19,182
Accounts payable	14,544	(14,963)
Deferred revenues	15,553	11,241
Other liabilities	15,642	(12,117)
Net cash provided by operating activities	18,439	890
Cash flows from investing activities:
Purchases of property and equipment	(7,685)	(20,753)
Net cash used in investing activities	(7,685)	(20,753)
Cash flows from financing activities:
Payment of convertible debt	0	(25)
Payment of convertible debt issuance costs	0	(35)
Proceeds from other debts	3,772	9,398
Repayment of other debts	(5,401)	(6,342)
Proceeds from common stock issued to employees	9,068	3,000
Payment of tax withholding obligations related to net share settlements of restricted stock units	(1,194)	(1,049)
Net cash provided by financing activities	6,245	4,947
Effect of exchange rate changes on cash and cash equivalents	(467)	(398)
Net increase (decrease) in cash and cash equivalents	16,532	(15,314)
Cash and cash equivalents at beginning of period	98,645	93,058
Cash and cash equivalents at end of period	115,177	77,744
Supplemental disclosures of cash flow information:
Income taxes, net of refunds	975	809
Interest payments	2,060	2,037
Supplemental schedule of non-cash investing and financing activities:
Capital expenditures incurred but not yet paid	1,140	5,000
Fair value of 2022 Notes used to settle 2020 Notes	$ 0	$ 44,357