Condensed Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 135,802	$ 43,777
Marketable securities, short-term	64,162
Grant receivable	109	109
Prepaid expenses and other current assets	4,840	543
Total current assets	204,913	44,429
Marketable securities, long-term	29,910
Property and equipment, net	13
Other assets	13
Total assets	234,849	44,429
Current liabilities
Accounts payable	382	531
Accrued expenses and other current liabilities	1,107	423
Preferred stock tranche rights liability		5,033
Preferred stock warrant liability		380
Total liabilities	1,489	6,367
Convertible Preferred Stock, Issued		56,653
Stockholders' deficit
Preferred stock, $0.0001 par value; 10,000,000 shares authorized and no shares issued and outstanding as of September 30, 2021; no shares authorized, issued and outstanding as of December 31, 2020
Common stock, $0.0001 par value; 300,000,000 shares authorized and 40,470,323 shares issued and outstanding as of September 30, 2021; 50,500,000 shares authorized and 419,124 shares issued and outstanding as of December 31, 2020	4
Additional paid-in capital	352,606	8,374
Accumulated deficit	(119,222)	(26,965)
Accumulated other comprehensive loss	(28)
Total stockholders' equity (deficit)	233,360	(18,591)
Total liabilities, convertible preferred stock and stockholders' equity (deficit)	234,849	44,429
Series A Convertible Preferred Stock [Member]
Current liabilities
Convertible Preferred Stock, Issued		1,067
Stockholders' deficit
Total stockholders' equity (deficit)	0	1,067
Series A-1 Convertible Preferred Stock [Member]
Current liabilities
Convertible Preferred Stock, Issued		16,333
Stockholders' deficit
Total stockholders' equity (deficit)	0	16,333
Series B Convertible Preferred Stock [Member]
Current liabilities
Convertible Preferred Stock, Issued		39,253
Stockholders' deficit
Total stockholders' equity (deficit)	$ 0	$ 39,253