Condensed Statement of Changes in Convertible Preferred Stock and Stockholders' Deficit - USD ($) $ in Thousands	Total	Series A Convertible Preferred Stock [Member]	Series A-1 Convertible Preferred Stock [Member]	Series B Convertible Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]
Opening balance at Dec. 31, 2019	$ (11,420)	$ 1,067	$ 16,333			$ 8,220	$ (19,640)
Opening balance (Shares) at Dec. 31, 2019		477,297	7,537,879		419,124
Share-based compensation	77					77
Net loss	(4,080)						(4,080)
Closing balance at Jun. 30, 2020	(15,423)	$ 1,067	$ 16,333			8,297	(23,720)
Closing balance (Shares) at Jun. 30, 2020		477,297	7,537,879		419,124
Opening balance at Mar. 31, 2020	(13,426)	$ 1,067	$ 16,333			8,259	(21,685)
Opening balance (Shares) at Mar. 31, 2020		477,297	7,537,879		419,124
Share-based compensation	38					38
Net loss	(2,035)						(2,035)
Closing balance at Jun. 30, 2020	(15,423)	$ 1,067	$ 16,333			8,297	(23,720)
Closing balance (Shares) at Jun. 30, 2020		477,297	7,537,879		419,124
Opening balance at Dec. 31, 2020	(18,591)	$ 1,067	$ 16,333	$ 39,253		8,374	(26,965)
Opening balance (Shares) at Dec. 31, 2020		477,297	7,537,879	11,862,043	419,124
Share-based compensation	253			$ 0		253
Issuance of milestone shares for cash, net of issuance costs				$ 30,031
Issuance of milestone shares for cash, net of issuance costs (Shares)				7,908,027
Exercise of preferred stock warrant			$ 1,250
Exercise of preferred stock warrant (shares)			447,426
Reclassification of preferred stock tranche rights liability upon issuance of milestone shares				$ 81,190
Reclassification of warrant liability upon exercise of preferred stock warrant	5,380		$ 5,380
Exercise of common stock warrants	614					614
Exercise of common stock warrants (Shares)					137,446
Net loss	(88,355)						(88,355)
Closing balance at Jun. 30, 2021	(106,079)	$ 1,067	$ 22,963	$ 150,474	$ 0	9,241	(115,320)
Closing balance (Shares) at Jun. 30, 2021		477,297	7,985,305	19,770,070	556,570
Opening balance at Mar. 31, 2021	(45,462)	$ 1,067	$ 16,333	$ 39,253	$ 0	8,500	(53,962)
Opening balance (Shares) at Mar. 31, 2021		477,297	7,537,879	11,862,043	419,124
Share-based compensation	127					127
Issuance of milestone shares for cash, net of issuance costs				$ 30,031
Issuance of milestone shares for cash, net of issuance costs (Shares)				7,908,027
Exercise of preferred stock warrant			$ 1,250
Exercise of preferred stock warrant (shares)			447,426
Reclassification of preferred stock tranche rights liability upon issuance of milestone shares				$ 81,190
Reclassification of warrant liability upon exercise of preferred stock warrant			$ 5,380
Exercise of common stock warrants	614					614
Exercise of common stock warrants (Shares)					137,446
Net loss	(61,358)						(61,358)
Closing balance at Jun. 30, 2021	$ (106,079)	$ 1,067	$ 22,963	$ 150,474	$ 0	$ 9,241	$ (115,320)
Closing balance (Shares) at Jun. 30, 2021		477,297	7,985,305	19,770,070	556,570