CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities:
Net income (loss)	$ 13,254	$ (29,271)	$ (5,924)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	12,546	11,737	11,287
Amortization of intangibles	507	3,970	8,319
Stock-based compensation	24,056	18,040	12,074
Amortization of convertible debt discount	6,308	7,058	6,756
Amortization of warrant	1,741	1,746	13,576
Foreign currency remeasurement	(5,126)	6,391	(290)
Loss on convertible debt extinguishment	0	1,362	5,695
Deferred income taxes, net	(6,197)	(105)	(2,076)
Provision for expected credit losses and returns	4,142	1,666	1,500
Provision for excess and obsolete inventories	3,460	1,847	1,479
Other adjustments	181	409	1,349
Changes in operating assets and liabilities:
Accounts receivable	(26,722)	21,186	(8,388)
Inventories	(39,338)	(8,195)	(4,819)
Other assets	(3,096)	11,556	(3,347)
Accounts payable	42,303	(18,173)	5,086
Deferred revenues	15,014	19,751	(3,436)
Other liabilities	(2,016)	(11,812)	(7,546)
Net cash provided by operating activities	41,017	39,163	31,295
Cash flows from investing activities:
Purchases of property and equipment	(12,975)	(32,205)	(10,328)
Net cash used in investing activities	(12,975)	(32,205)	(10,328)
Cash flows from financing activities:
Proceeds from convertible debt	0	0	115,500
Repayment of convertible debt	0	(7,999)	(109,603)
Payment of convertible debt issuance costs	0	(672)	(4,277)
Proceeds from other debts	3,861	9,398	4,684
Repayment of other debts	(6,169)	(6,646)	(6,913)
Proceeds from common stock issued to employees	12,311	5,472	8,406
Payment of tax withholding obligations related to net share settlements of restricted stock units	(2,064)	(1,662)	(1,492)
Net cash provided by (used in) financing activities	7,939	(2,109)	6,305
Effect of exchange rate changes on cash and cash equivalents	(1,195)	738	(203)
Net increase in cash and cash equivalents	34,786	5,587	27,069
Cash and cash equivalents, beginning of the year	98,645	93,058	65,989
Cash and cash equivalents, end of the year	133,431	98,645	93,058
Supplemental disclosures of cash flow information:
Income tax payments (refunds), net	2,525	(17)	1,138
Interest payments, net	4,095	4,221	4,260
Supplemental schedule of non-cash investing and financing activities:
Capital expenditures incurred but not yet paid	751	1,155	2,055
Fair value of warrants issued	0	0	16,142
Fair value of 2022 Notes used to settle 2020 Notes	$ 0	$ 44,357	$ 0