CONDENSED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Collaboration revenue				$ 115
Operating expenses
Research and development	$ 9,828	$ 4,620	$ 24,950	10,535
General and administrative	3,918	1,289	8,560	3,281
Total operating expenses	13,746	5,909	33,510	13,816
Loss from operations	(13,746)	(5,909)	(33,510)	(13,701)
Other income (expense), net:
Change in fair value of preferred stock purchase right liability		3,383	(40,163)	3,383
Change in fair value of derivative liability		858		858
Loss from extinguishment of debt		(752)		(752)
Interest income	206		358	60
Interest expense		(283)		(472)
Other income (expense), net	(153)	35	(149)	35
Total other income (expense), net	53	3,241	(39,954)	3,112
Net loss	(13,693)	(2,668)	(73,464)	(10,589)
Comprehensive loss:
Net loss	(13,693)	(2,668)	(73,464)	(10,589)
Other comprehensive loss	3		6
Comprehensive loss	$ (13,690)	$ (2,668)	$ (73,458)	$ (10,589)
Net loss per share, basic and diluted	$ (0.44)	$ (1.75)	$ (6.39)	$ (7.45)
Weighted average shares used to compute net loss per share, basic and diluted	30,981,441	1,528,510	11,499,327	1,421,882