CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Operating activities:
Net loss	$ (8,080)	$ (58,165)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	11,709	11,728
Stock-based compensation	8,471	12,276
Inventory write-downs	0	8,132
Asset impairment charges	0	5,333
Deferred income tax (benefit) and other non-cash charges	(1,230)	(82)
Provision for excess and obsolete inventory	861	1,754
Amortization of debt discount and issuance costs	336	294
Loss on disposal of assets	974	(155)
Provisions for bad debts, net of recoveries	966	834
Decrease (Increase) in:
Accounts receivable	6,864	1,282
Inventories	(8,097)	(544)
Prepaid expenses and other current assets	4,298	4,047
(Decrease) Increase in:
Accounts payable and accrued liabilities	(1,722)	(2,802)
Income taxes payable	(1,884)	653
Customer deposits	144	(1,534)
Unearned service revenues	778	(1,198)
Other liabilities	(1,033)	567
Net cash provided by (used in) operating activities	13,355	(17,580)
Investing activities:
Purchases of property and equipment	(3,559)	(5,016)
Maturity of short-term investments	20,009	0
Cash paid for technology development, patents and licenses	(4,822)	(5,071)
Net cash provided by (used in) investing activities	11,628	(10,087)
Financing activities:
Payments on finance leases	(135)	(154)
Cash settlement of equity awards	0	(89)
Repurchases of common stock	(10,014)	0
Proceeds from issuance of 5.50% Convertible Senior Notes, due 2028, net of discount, issuance cost and accrued interest	0	72,310
Repayment of 5.50% Convertible Senior Notes, due 2028	(2,685)	0
Payment of contingent consideration for business acquisition	0	(1,098)
Net cash (used in) provided by financing activities	(12,834)	70,969
Effect of exchange rate changes on cash and cash equivalents	(23)	(1,195)
Increase in cash and cash equivalents	12,126	42,107
Cash and cash equivalents, beginning of period	76,787	37,812
Cash and cash equivalents, end of period	$ 88,913	$ 79,919