Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Cash flows from operating activities:
Net loss	$ (35,830)	$ (28,432)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation	9,356	9,292
Amortization	3,403	2,697
Reduction in carrying amount of right-of-use assets	1,367	947
Provision for losses on (recoveries of) accounts receivable	1,489	(2)
Stock-based compensation	18,961	19,645
Deferred income taxes	0	7
Loss on disposal of property, plant and equipment	76	525
Changes in operating assets and liabilities:
Accounts receivable, net	(2,119)	2,308
Inventory	3,348	5,491
Prepaid expenses and other current assets	954	1,358
Other assets, net	(3,351)	(442)
Accounts payable	4,628	(2,079)
Accrued and other long-term liabilities	2,511	161
Deferred revenues	(1,931)	617
Lease liabilities	(1,546)	(1,076)
Non-current income taxes payable	212	(1,330)
Net cash provided by operating activities	1,528	9,687
Cash flows from investing activities:
Purchases of property, plant and equipment	(5,313)	(4,386)
Purchase of marketable securities	(88,643)	(103,008)
Proceeds from maturities and sales of marketable securities	83,033	94,231
Net cash used in investing activities	(10,923)	(13,163)
Cash flows from financing activities:
Proceeds from employee stock plan purchases	1,355	1,220
Proceeds from stock option exercises	221	385
Tax payments related to stock award issuances	(3,945)	(3,667)
Net cash used in financing activities	(2,369)	(2,062)
Effect of exchange rate changes on cash	12	(198)
Net decrease in cash, cash equivalents, and restricted cash	(11,752)	(5,736)
Cash, cash equivalents, and restricted cash, beginning of period	53,466	58,078
Cash, cash equivalents, and restricted cash, end of period	41,714	52,342
Supplemental disclosures:
Cash paid for interest, net	40	20
Cash paid for income taxes	302	270
Operating cash outflows from operating leases	3,057	2,890
Right-of-use assets obtained in exchange for lease liabilities	995	1,295
Accrued purchases of property, equipment and patents	415	561
Reconciliation of cash, cash equivalents, and restricted cash:
Cash and cash equivalents	41,456	52,087
Restricted cash	258	255
Total cash, cash equivalents, and restricted cash	$ 41,714	$ 52,342