Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Operating expenses:
Research and development (includes related party amounts of $905, $249, $1846, and $653, respectively)	$ 21,597	$ 14,859	$ 42,178	$ 30,724
General and administrative (includes related party amounts of $0, $34, $16, and $77, respectively)	13,722	5,162	26,725	9,672
Total operating expenses	35,319	20,021	68,903	40,396
Loss from operations	(35,319)	(20,021)	(68,903)	(40,396)
Other income (expense):
Interest income	13	182	27	1,060
Interest expense	(1,256)	(1,262)	(2,528)	(2,000)
Change in fair value of warrant liabilities			0	95
Other income (expense)	10		9	(1)
Total other income (expense)	(1,233)	(1,080)	(2,492)	(846)
Net loss and comprehensive loss	$ (36,552)	$ (21,101)	$ (71,395)	$ (41,242)
Net loss per share, basic and diluted	$ (1.00)	$ (0.64)	$ (1.96)	$ (1.26)
Weighted-average shares of common stock outstanding, basic and diluted	36,636,164	32,997,099	36,468,498	32,733,750