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	$ (39,232)	$ (69,013)
Adjustments to reconcile net loss to net cash used in operating activities:
Noncash stock compensation expense	6,823	2,121
Depreciation and amortization	68	76
Amortization of premium (discount) on investment securities	(301)	23
Amortization of debt issuance costs	461	461
Amortization of leasehold interest	53	53
Noncash change in lease liability and right of use asset	491	683
Change in fair value of notes payable	59	(178)
Changes in assets and liabilities:
Increase in inventory	(26,924)
Decrease (increase) in other current assets	(2,623)	6,759
Decrease (increase) in accounts receivable	(8,623)	487
Increase (decrease) in accounts payable and accrued expenses	9,858	(10,170)
Decrease in lease liabilities	(593)	(492)
Increase in other current liabilities	619	539
Decrease in deferred revenue	(38)	(38)
Net cash used in operating activities	(59,902)	(68,689)
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds from maturity of short-term securities	16,000	13,225
Investment in held-to-maturity securities	(22,168)	(56,889)
Purchases of PPE		(7)
Net cash used in investing activities	(6,168)	(43,671)
CASH FLOWS FROM FINANCING ACTIVITIES
Payment of loan payable		(975)
Proceeds from exercise of options	363	125
Proceeds from debt financings	25,000
Financing costs paid	(125)
Net cash (used in) provided by financing activities	25,238	(850)
NET (DECREASE) INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	(40,832)	(113,210)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH AT BEGINNING OF PERIOD	103,577	300,151
CASH, CASH EQUIVALENTS AND RESTRICTED CASH AT END OF PERIOD	$ 62,745	$ 186,941