Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating expenses:
Research and development	$ 145,558	$ 115,308	$ 36,522
General and administrative	60,971	21,337	6,610
Total operating expenses	206,529	136,645	43,132
Loss from operations	(206,529)	(136,645)	(43,132)
Other income, net	173	967	1,136
Net loss	(206,356)	(135,678)	(41,996)
Other comprehensive loss:
Unrealized loss on marketable securities	(253)	(1)	(1)
Comprehensive loss	$ (206,609)	$ (135,679)	$ (41,997)
Per share information:
Net loss per share, basic (in USD per share)	$ (4.18)	$ (3.80)	$ (22.78)
Net loss per share, diluted (in USD per share)	$ (4.18)	$ (3.80)	$ (22.78)
Weighted-average shares used in computing net loss per share, basic (in shares)	49,405,575	35,668,152	1,843,213
Weighted-average shares used in computing net loss per share, diluted (in shares)	49,405,575	35,668,152	1,843,213