Unaudited Condensed Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Collaboration revenue	$ 1,159	$ 0	$ 2,021	$ 0
Operating expenses:
Research and development (includes related party amounts of $416, $432, $1,325 and $1,071, respectively)	8,406	834	15,068	2,056
General and administrative (includes related party amounts of $62, $219, $265 and $638, respectively)	3,656	422	6,392	1,132
Total operating expenses	12,062	1,256	21,460	3,188
Loss from operations	(10,903)	(1,256)	(19,439)	(3,188)
Other income (expense):
Interest income	137	0	183	0
Interest expense – related parties	0	0	0	(206)
Change in fair value of convertible promissory notes - related parties	0	0	0	(1,735)
Total other income (expense)	137	0	183	(1,941)
Net loss	(10,766)	(1,256)	(19,256)	(5,129)
Other comprehensive loss:
Unrealized gain (loss) on available-for-sale securities, net	7	0	24	0
Comprehensive loss	$ (10,759)	$ (1,256)	$ (19,232)	$ (5,129)
Net loss per common share, basic and diluted	$ (0.26)	$ (1.33)	$ (1.10)	$ (5.79)
Weighted-average shares of common stock outstanding, basic and diluted	41,134,102	943,634	17,572,807	885,486