Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (16,460)	$ (31,563)
Adjustments to reconcile loss to net cash used in operating activities:
Depreciation and amortization	63	144
(Accretion) amortization of investments	(907)	374
Stock-based compensation	5,556	6,078
Amortization of intangible asset	702	636
Changes in assets and liabilities:
Accounts receivable, net	(2,246)	53,419
Inventory	22,809	(52,940)
Prepaid and other current assets	(386)	(5,740)
Other long-term assets	(556)
Interest receivable	(16)	140
Deferred revenue	(445)	(372)
Accounts payable and other current liabilities	(15,237)	(69,658)
Other long-term liabilities	115	635
Net cash used in operating activities	(7,008)	(98,847)
CASH FLOWS FROM INVESTING ACTIVITIES:
Maturities of securities	32,913	113,220
Purchases of securities	(52,523)	(14,171)
Net cash (used in) provided by investing activities	(19,610)	99,049
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercise of stock options, net of transaction costs	1,871	30
Taxes paid related to stock-based awards	(1,507)	(535)
Net cash provided by (used in) financing activities	364	(505)
NET DECREASE IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH	(26,254)	(303)
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD	218,189	223,372
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD	191,935	223,069
Cash (paid) received during the year for:
Income taxes	(38)	51
Supplemental disclosure of non-cash transactions:
Initial recognition of operating lease right-of-use asset	446	$ 1,036
Initial recognition of furniture, fixtures and equipment lease	$ 624