Condensed Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating activities
Net loss	$ (22,006)	$ (23,921)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation	461	211
Stock-based compensation	3,566	1,096
Change in fair value of convertible promissory notes	0	11,400
Change in fair value of warrant liability	0	2,202
Amortization of premium on short -term investments	1,174	72
Amortization of right-of-use lease assets	641	0
Accretion of debt issuance costs	37	78
Changes in operating assets and liabilities:
Inventory	(3,318)	0
Prepaid expenses and other assets	1,648	(264)
Other noncurrent assets	(1,111)	(804)
Accounts payable	1,013	144
Accrued expenses	(1,367)	585
Other current liabilities	0	(58)
Lease liabilities	(550)	0
Other noncurrent liabilities	(27)	74
Net cash used in operating activities	(19,839)	(9,185)
Investing activities
Purchases of short-term investments	(35,193)	(101,608)
Sales of short-term investments	10,334	8,838
Maturities of shot-term investments	34,184	2,816
Purchases of property and equipment	(939)	(507)
Net cash (used) in / provided by investing activities	8,386	(90,461)
Financing activities
Proceeds from issuance of common stock, net of repurchases	23	2,984
Proceeds from issuance of convertible promisorry notes	0	130,500
Net cash provided by financing activities	23	133,484
Increase in cash and cash equivalents and restricted cash	(11,430)	33,838
Cash and cash equivalents and restricted cash, beginning of year	201,736	12,170
Cash and cash equivalents and restricted cash, end of year	190,306	46,008
Supplemental disclosure for cash activities
Interest paid	105	148
Supplemental disclosure for non-cash activities
Initial lease liability recognized upon adoption of ASC 842	7,074	0
Vesting of restricted stock	344	92
Deferred offering costs in accrued expenses	0	804
Purchase of property plant and equipment included in accounts payable	$ 164	$ 86