Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Revenue	$ 553	$ 2,445
Operating expenses:
Research and development	35,830	41,529
General and administrative	34,421	16,831
Other operating income, net	(1,122)	(545)
Total operating expenses	69,129	57,815
Loss from operations	(68,576)	(55,370)
Interest income, net	397	354
Other income (expense), net	35	(27)
Total other income, net	432	327
Net loss	(68,144)	(55,043)
Comprehensive loss:
Net unrealized loss on marketable securities	(4,977)	(93)
Comprehensive loss	$ (73,121)	$ (55,136)
Net loss per common share, basic (in dollars per share)	$ (0.28)	$ (3.19)
Net loss per common share, diluted (in dollars per share)	$ (0.28)	$ (3.19)
Weighted-average shares used to compute net loss per common share, basic (in shares)	244,178	17,272
Weighted-average shares used to compute net loss per common share, diluted (in shares)	244,178	17,272