CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating activities:
Net loss	$ (9,687)	$ (3,221)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	3,012	3,190
Stock-based compensation	2,867	2,094
Provisions for bad debts, net of recoveries	16	(89)
Loss on disposal of assets	112	20
Provision for excess and obsolete inventory	229	1,404
Deferred income tax expense (benefit)	66	(1,612)
Decrease (Increase) in:
Accounts receivable	1,449	3,676
Inventories	(2,065)	(3,999)
Prepaid expenses and other current assets	(3,313)	(1,346)
(Decrease) Increase in:
Accounts payable and accrued liabilities	(1,682)	(9,823)
Income taxes payable	1,261	(1,153)
Customer deposits	492	896
Unearned service revenues	206	(323)
Net cash used in operating activities	(7,037)	(10,286)
Investing activities:
Purchases of property and equipment	(2,442)	(1,547)
Cash paid for technology development, patents and licenses	(2,612)	(890)
Net cash used in investing activities	(5,054)	(2,437)
Financing activities:
Payments on finance leases	(58)	(86)
Payments for taxes related to net share settlement of equity awards	(916)	(3,336)
Proceeds from issuance of stock related to stock option exercises	0	5,118
Net cash (used in) provided by financing activities	(974)	1,696
Effect of exchange rate changes on cash and cash equivalents	(1,732)	(4,649)
Decrease in cash and cash equivalents	(14,797)	(15,676)
Cash and cash equivalents, beginning of period	121,989	185,633
Cash and cash equivalents, end of period	$ 107,192	$ 169,957