Condensed Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit) (Unaudited) - USD ($) $ in Thousands	Total	Series A Convertible Preferred Stock	Common Stock	Additional Paid-in Capital	Accumulated Deficit
Balance at Dec. 31, 2019	$ (135)			$ 980	$ (1,115)
Balance, shares at Dec. 31, 2019			10,894,999
Issuance of convertible preferred stock		$ 17,110
Issuance of convertible preferred stock, shares		6,200,000
Reclassification of preferred stock tranche liability upon issuance of Series A milestone shares		$ 904
Net loss	(26,651)				(26,651)
Balance at Jun. 30, 2020	(26,786)			980	(27,766)
Balance, shares at Jun. 30, 2020			10,894,999
Convertible preferred stock balance, shares at Jun. 30, 2020		6,200,000
Convertible preferred stock balance at Jun. 30, 2020		$ 18,014
Balance at Mar. 31, 2020	(5,566)			980	(6,546)
Convertible preferred stock balance, shares at Mar. 31, 2020		6,000,000
Convertible preferred stock balance at Mar. 31, 2020		$ 16,520
Balance, shares at Mar. 31, 2020			10,894,999
Issuance of convertible preferred stock		$ 590
Issuance of convertible preferred stock, shares		200,000
Reclassification of preferred stock tranche liability upon issuance of Series A milestone shares		$ 904
Net loss	(21,220)				(21,220)
Balance at Jun. 30, 2020	(26,786)			980	(27,766)
Balance, shares at Jun. 30, 2020			10,894,999
Convertible preferred stock balance, shares at Jun. 30, 2020		6,200,000
Convertible preferred stock balance at Jun. 30, 2020		$ 18,014
Balance at Dec. 31, 2020	$ 251,302			312,428	(61,126)
Balance, shares at Dec. 31, 2020	37,761,435		37,761,435
Stock-based compensation	$ 8,143			8,143
Issuance of common stock upon vesting and settlement of restricted stock units, shares			629,730
Net loss	(72,950)				(72,950)
Balance at Jun. 30, 2021	$ 186,495			320,571	(134,076)
Balance, shares at Jun. 30, 2021	38,391,165		38,391,165
Balance at Mar. 31, 2021	$ 222,872			316,022	(93,150)
Balance, shares at Mar. 31, 2021			37,761,435
Stock-based compensation	4,549			4,549
Issuance of common stock upon vesting and settlement of restricted stock units, shares			629,730
Net loss	(40,926)				(40,926)
Balance at Jun. 30, 2021	$ 186,495			$ 320,571	$ (134,076)
Balance, shares at Jun. 30, 2021	38,391,165		38,391,165