CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating activities:
Net loss	$ (21,164)	$ (9,687)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	4,413	3,012
Stock-based compensation	3,634	2,867
Deferred income tax expense (benefit)	562	66
Provision for excess and obsolete inventory	344	229
Loss on disposal of assets	69	112
Provisions for bad debts, net of recoveries	33	16
Decrease (Increase) in:
Accounts receivable	2,378	1,449
Inventories	(1,530)	(2,065)
Prepaid expenses and other current assets	(4,219)	(3,313)
(Decrease) Increase in:
Accounts payable and accrued liabilities	(2,450)	(1,682)
Income taxes payable	(102)	1,261
Customer deposits	(433)	492
Unearned service revenues	121	206
Net cash used in operating activities	(18,344)	(7,037)
Investing activities:
Purchases of property and equipment	(1,688)	(2,442)
Purchases of short-term investments	(20,024)	0
Cash paid for technology development, patents and licenses	(1,820)	(2,612)
Net cash used in investing activities	(23,532)	(5,054)
Financing activities:
Payments on finance leases	(44)	(58)
Payments for taxes related to net share settlement of equity awards	14
Payments for taxes related to net share settlement of equity awards		(916)
Proceeds from issuance of 5.50% Convertible Senior Notes, due 2028, net of discount, issuance cost and accrued interest	72,310	0
Net cash provided by (used in) financing activities	72,280	(974)
Effect of exchange rate changes on cash and cash equivalents	348	(1,732)
Increase (Decrease) in cash and cash equivalents	30,752	(14,797)
Cash and cash equivalents, beginning of period	37,812	121,989
Cash and cash equivalents, end of period	$ 68,564	$ 107,192