Condensed Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities
Net loss	$ (17,085)	$ (4,714)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation, amortization and accretion	9	35
Reduction in the carrying amount of operating lease right of use assets	564	0
Stock-based compensation	1,662	404
Restructuring payments	0	(590)
Changes in operating assets and liabilities:
Prepaid expense and other current assets	(3,942)	(127)
Other assets	271	0
Accounts payable	5,943	(198)
Accrued and other current liabilities	4,223	1,069
Operating lease assets and liabilities, net	(626)	0
Net cash used in operating activities	(8,981)	(4,121)
Cash flows from investing activities
Purchase of property and equipment	(18)	0
Purchase of marketable securities	(39,437)	0
Net cash provided by (used in) investing activities	(39,455)	0
Cash flows from financing activities
Proceeds from exercise of stock options and employee stock purchase plan	234	342
Proceeds from issuance of Class A common stock offering, net of underwriting discounts and commissions	86,130	0
Payment of costs related to stock offering	(6,096)	0
Payment of deferred offering costs	0	(369)
Payment on capital lease obligations	0	(1)
Net cash provided by (used in) financing activities	80,268	(28)
Net increase (decrease) in cash and cash equivalents and restricted cash	31,832	(4,149)
Cash, cash equivalents and restricted cash, beginning of period	79,967	53,997
Cash, cash equivalents and restricted cash, end of period	111,799	49,848
Supplemental disclosure of cash flow information
Cash paid for interest expense	104	0
Cash paid for operating leases	656
Deferred offering costs included in accounts payable	0	729
Deferred offering costs included in accrued and other current liabilities	0	195
Cash and cash equivalents [Member]
Cash flows from financing activities
Cash, cash equivalents and restricted cash, end of period	111,506	49,505
Restricted cash [Member]
Cash flows from financing activities
Cash, cash equivalents and restricted cash, end of period	$ 293	$ 343