Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Operating expenses:
Research and development (includes related party amounts of $849, $1,023, $2,695, and $1,676, respectively)	$ 16,608	$ 25,770	$ 58,786	$ 56,494
General and administrative (includes related party amounts of $0, $62, $16, and $139, respectively)	16,529	7,060	43,254	16,732
Total operating expenses	33,137	32,830	102,040	73,226
Loss from operations	(33,137)	(32,830)	(102,040)	(73,226)
Other income (expense):
Interest income	8	15	35	1,075
Interest expense	(1,485)	(1,286)	(4,013)	(3,286)
Change in fair value of warrant liabilities				95
Other income (expense)	(2,048)	(4)	(2,039)	(5)
Total other income (expense)	(3,525)	(1,275)	(6,017)	(2,121)
Net loss and comprehensive loss	$ (36,662)	$ (34,105)	$ (108,057)	$ (75,347)
Net loss per share, basic and diluted	$ (0.98)	$ (1.02)	$ (2.94)	$ (2.29)
Weighted-average shares of common stock outstanding, basic and diluted	37,299,351	33,366,237	36,748,492	32,946,128