Condensed Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Revenue	$ 119	$ 5,164	$ 548	$ 30,369
Operating expenses:
Research and development	86,788	44,650	141,838	85,913
General and administrative	37,695	17,171	58,009	37,162
Total operating expenses	124,483	61,821	199,847	123,075
Loss from operations	(124,364)	(56,657)	(199,299)	(92,706)
Other income, net	1,276	384	1,766	929
Net loss	(123,088)	(56,273)	(197,533)	(91,777)
Unrealized (loss)/gain on marketable securities, net of tax	(1,522)	(22)	(5,640)	(208)
Comprehensive loss	$ (124,610)	$ (56,295)	$ (203,173)	$ (91,985)
Net loss per share, basic	$ (2.48)	$ (1.14)	$ (3.98)	$ (1.87)
Net loss per share, diluted	$ (2.48)	$ (1.14)	$ (3.98)	$ (1.87)
Weighted-average common shares outstanding, basic	49,702,860	49,204,425	49,657,426	49,063,298
Weighted-average common shares outstanding, diluted	49,702,860	49,204,425	49,657,426	49,063,298