CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Operating activities:
Net loss	$ (7,267)	$ (21,164)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	3,621	4,413
Stock-based compensation	4,539	3,634
Deferred income tax (benefit) and other non-cash charges	(805)	562
Provision for excess and obsolete inventory	152	344
Amortization of debt discount and issuance costs	112	0
Loss on disposal of assets	96	69
Provisions for bad debts, net of recoveries	300	33
Decrease (Increase) in:
Accounts receivable	1,405	2,378
Inventories	1,957	(1,530)
Prepaid expenses and other current assets	5,587	(4,219)
(Decrease) Increase in:
Accounts payable and accrued liabilities	(5,721)	(2,450)
Income taxes payable	783	(102)
Customer deposits	819	(433)
Unearned service revenues	1,282	121
Other liabilities	(285)	0
Net cash provided by (used in) operating activities	6,575	(18,344)
Investing activities:
Purchases of property and equipment	(1,323)	(1,688)
Purchases of short-term investments	0	(20,024)
Cash paid for technology development, patents and licenses	(1,442)	(1,820)
Net cash used in investing activities	(2,765)	(23,532)
Financing activities:
Payments on finance leases	(40)	(44)
Cash settlement of equity awards	0	14
Proceeds from issuance of 5.50% Convertible Senior Notes, due 2028, net of discount, issuance cost and accrued interest	0	72,310
Net cash (used in) provided by financing activities	(40)	72,280
Effect of exchange rate changes on cash and cash equivalents	(1,039)	348
Increase in cash and cash equivalents	2,731	30,752
Cash and cash equivalents, beginning of period	76,787	37,812
Cash and cash equivalents, end of period	$ 79,518	$ 68,564