CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating activities:
Net loss	$ (56,577)	$ (26,756)	$ (39,964)
Adjustments to reconcile net loss to net cash used by operating activities:
Depreciation and amortization	15,377	13,983	13,396
Stock-based compensation	17,833	13,317	11,456
Inventory write-downs	9,340	0	0
Asset impairment charges	5,707	507	0
Provision for bad debts, net of recoveries	1,030	163	176
Amortization of debt discount and issuance costs	450	0	0
Loss on disposal of assets	274	156	218
Provision for excess and obsolete inventory	2,361	(68)	2,297
Impairment of intangible assets	0	1,135	0
Deferred income tax expense (benefit)	(26)	2,412	24,706
(Increase) decrease in:
Accounts receivable, net	(50)	(11,198)	(15,577)
Inventories	736	3,379	(6,706)
Prepaid expenses and other assets	3,387	(21,239)	5,996
(Decrease) increase in:
Accounts payable and accrued liabilities	4,421	4,777	(13,260)
Income taxes payable	(3,808)	(1,904)	847
Customer deposits	(2,533)	1,343	2,627
Unearned service revenues	2,786	(4,863)	312
Other liabilities	367	0	0
Net cash provided by (used in) operating activities	1,075	(24,856)	(13,476)
Investing activities:
Purchases of property and equipment	(6,817)	(6,371)	(7,035)
Purchases of short-term investments	(19,496)	0	0
Cash paid for technology development, patents and licenses	(7,177)	(10,567)	(4,905)
Acquisitions of businesses and minority share investments, net of cash received	0	(32,959)	(33,800)
Net cash used in investing activities	(33,490)	(49,897)	(45,740)
Financing activities:
Payments on capital leases	(154)	(220)	(296)
Cash settlement of equity awards	217	(1,892)	(4,002)
Proceeds from issuance of stock related to stock option exercises	0	0	5,880
Short term debt	0	1,115	0
Proceeds from issuance of 5.50% Convertible Senior Notes, due 2028, net of discount, issuance cost and accrued interest	72,310	0	0
Payment of contingent consideration for business acquisition	(1,098)	0	0
Net cash provided by (used in) financing activities	71,275	(997)	1,582
Effect of exchange rate changes on cash and cash equivalents	115	(8,427)	(6,010)
Increase (Decrease) in cash and cash equivalents	38,975	(84,177)	(63,644)
Cash and cash equivalents, beginning of period	37,812	121,989	185,633
Cash and cash equivalents, end of period	$ 76,787	$ 37,812	$ 121,989