Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash flows from operating activities:
Net loss	$ (60,792)	$ (41,670)	$ (54,579)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation	12,988	12,401	11,085
Amortization	4,608	3,629	4,614
Reduction in carrying amount of right-of-use assets	1,759	1,269	3,000
Provision for losses on accounts receivable	1,489	27	4
Stock-based compensation	24,961	25,832	26,757
Deferred income taxes	(651)	7	4
Loss on disposal of property, plant and equipment	194	542	51
Non-cash restructuring charges	1,185	0	2,758
Changes in operating assets and liabilities:
Accounts receivable, net	2,845	(1,677)	2,757
Inventory	11,048	14,890	4,623
Prepaid expenses and other current assets	(1,787)	1,109	(1,753)
Other assets, net	(1,131)	(1,156)	(5,219)
Accounts payable	3,231	(4,503)	(5,904)
Accrued and other long-term liabilities	706	(1,336)	(577)
Deferred revenues	(1,224)	3,432	(208)
Lease liabilities	(1,992)	(1,449)	(1,942)
Non-current income taxes payable	204	(1,256)	(13)
Net cash (used in) provided by operating activities	(2,359)	10,091	(14,542)
Cash flows from investing activities:
Acquisition of business, net of cash acquired	0	0	(664)
Purchases of property, plant and equipment	(7,932)	(5,339)	(21,388)
Acquisition of intangible assets and capitalization of patents	0	0	(332)
Purchase of marketable securities	(88,643)	(127,907)	(99,985)
Proceeds from maturities and sales of marketable securities	113,265	119,146	49,988
Net cash provided by (used in) investing activities	16,690	(14,100)	(72,381)
Cash flows from financing activities:
Proceeds from employee stock plan purchases	2,721	2,469	2,358
Proceeds from stock option exercises	500	640	1,197
Tax payments related to stock award issuances	(4,524)	(3,968)	(4,861)
Net cash used in financing activities	(1,303)	(859)	(1,306)
Effect of exchange rate changes on cash	(406)	256	(477)
Net increase (decrease) in cash and cash equivalents and restricted cash	12,622	(4,612)	(88,706)
Cash and cash equivalents and restricted cash, beginning of period	53,466	58,078	146,784
Cash and cash equivalents and restricted cash, end of period	66,088	53,466	58,078
Supplemental disclosures:
Cash paid for interest	61	40	0
Cash paid for income taxes	716	256	442
Operating cash outflows from operating leases	4,030	3,850	3,925
Right-of-use assets obtained in exchange for lease liabilities	1,336	1,716	1,349
Accrued purchases of property, equipment and patents	298	745	207
Reconciliation of cash, cash equivalents, and restricted cash:
Cash and cash equivalents	65,829	53,210	57,826
Restricted cash	259	256	252
Total cash, cash equivalents, and restricted cash	$ 66,088	$ 53,466	$ 58,078