Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash flows from operating activities:
Net loss	$ (31,920)	$ (20,919)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation	8,135	6,670
Amortization	3,492	4,641
Reduction in carrying amount of right-of-use assets	2,369	2,435
Provision for (recoveries of) losses on accounts receivable	2	(70)
Stock-based compensation	20,728	29,732
Deferred income taxes	(1)	(11)
Loss on disposal of assets	0	3
Unrealized gain on available-for-sale securities	(190)	0
Changes in operating assets and liabilities:
Accounts receivable, net	(3,431)	(4,580)
Inventory	(8,761)	(16,169)
Prepaid expenses and other current assets	1,091	(5,542)
Other assets, net	(308)	(437)
Accounts payable	(5,792)	9,699
Accrued and other long-term liabilities	1,219	907
Deferred revenues	142	(925)
Lease liabilities	(1,241)	(2,156)
Non-current income taxes payable	(86)	(591)
Net cash provided by (used in) operating activities	(14,552)	2,687
Cash flows from investing activities:
Acquisition of business, net of cash acquired	(664)	(291)
Purchases of property, plant and equipment	(16,442)	(13,636)
Acquisition of intangible assets and capitalization of patents	(359)	(303)
Purchase of marketable securities	(50,000)	0
Net cash used in investing activities	(67,465)	(14,230)
Cash flows from financing activities:
Proceeds from public offerings, net of offering costs	0	82,354
Principal payments on term loan, debt and financing leases	0	(428)
Payment of contingent consideration related to acquisition	0	(326)
Proceeds from employee stock plan purchases	1,201	750
Proceeds from stock option exercises	1,146	975
Tax payments related to stock award issuances	(3,967)	(8,265)
Net cash provided by (used in) financing activities	(1,620)	75,060
Effect of exchange rate changes on cash	(712)	(256)
Net increase (decrease) in cash, cash equivalents, and restricted cash	(84,349)	63,261
Cash, cash equivalents, and restricted cash, beginning of period	146,784	102,573
Cash, cash equivalents, and restricted cash, end of period	62,435	165,834
Supplemental disclosures:
Cash paid for interest, net	0	116
Cash paid for income taxes	250	434
Operating cash outflows from operating leases	2,828	2,555
Right-of-use assets obtained in exchange for lease liabilities	2,242	7,348
Accrued purchases of property, equipment and patents	$ 2,468	$ 2,287