CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Operating activities:
Net loss	$ (7,791)	$ (49,409)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	7,788	7,925
Stock-based compensation	5,703	8,584
Inventory write-downs	0	8,132
Asset impairment charges	0	4,571
Deferred income tax (benefit) and other non-cash charges	(1,327)	(41)
Provision for excess and obsolete inventory	490	1,033
Amortization of debt discount and issuance costs	223	181
Loss on disposal of assets	994	130
Provisions for bad debts, net of recoveries	304	408
Decrease (Increase) in:
Accounts receivable	3,943	3,280
Inventories	(3,764)	1,587
Prepaid expenses and other current assets	7,771	3,105
(Decrease) Increase in:
Accounts payable and accrued liabilities	(3,087)	(277)
Income taxes payable	(1,853)	(263)
Customer deposits	1,126	(1,210)
Unearned service revenues	965	(750)
Other liabilities	(698)	(193)
Net cash provided by (used in) operating activities	10,787	(13,207)
Investing activities:
Purchases of property and equipment	(1,688)	(4,312)
Maturity of short-term investments	20,009
Maturity of short-term investments		(20,024)
Cash paid for technology development, patents and licenses	(3,392)	(3,616)
Net cash provided by (used in) investing activities	14,929	(27,952)
Financing activities:
Payments on finance leases	(109)	(105)
Cash settlement of equity awards	0	(277)
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
Net cash (used in) provided by financing activities	(2,794)	71,928
Effect of exchange rate changes on cash and cash equivalents	(1,795)	(353)
Increase in cash and cash equivalents	21,127	30,416
Cash and cash equivalents, beginning of period	76,787	37,812
Cash and cash equivalents, end of period	$ 97,914	$ 68,228