CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Operating activities:
Net loss	$ (58,165)	$ (24,521)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	11,728	10,061
Stock-based compensation	12,276	10,024
Inventory write-downs	8,132	0
Asset impairment charges	5,333	0
Deferred income tax (benefit) expense and other non-cash charges	(82)	568
Provision for excess and obsolete inventory	1,754	209
Amortization of debt discount and issuance costs	294	0
Loss on disposal of assets	(155)	356
Provisions for bad debts, net of recoveries	834	80
Decrease (Increase) in:
Accounts receivable	1,282	867
Inventories	(544)	2,129
Prepaid expenses and other current assets	4,047	(14,566)
(Decrease) Increase in:
Accounts payable and accrued liabilities	(2,802)	(2,249)
Income taxes payable	653	1,008
Customer deposits	(1,534)	588
Unearned service revenues	(1,198)	(2,710)
Other liabilities	567	0
Net cash used in operating activities	(17,580)	(18,156)
Investing activities:
Purchases of property and equipment	(5,016)	(4,978)
Cash paid for technology development, patents and licenses	(5,071)	(9,154)
Acquisition of business, net of cash acquired	0	(29,068)
Net cash used in investing activities	(10,087)	(43,200)
Financing activities:
Payments on finance leases	(154)	(172)
Payments for taxes related to net share settlement of equity awards	(89)	(1,584)
Proceeds from issuance of 5.50% Convertible Senior Notes, due 2028, net of discount, issuance cost and accrued interest	72,310	0
Payment of contingent consideration for business acquisition	(1,098)	0
Net cash provided by (used in) financing activities	70,969	(1,756)
Effect of exchange rate changes on cash and cash equivalents	(1,195)	(10,343)
Increase (Decrease) in cash and cash equivalents	42,107	(73,455)
Cash and cash equivalents, beginning of period	37,812	121,989
Cash and cash equivalents, end of period	$ 79,919	$ 48,534