Condensed Consolidated Statements of Operations and Comprehensive Loss - 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	$ 4,242	$ 832	$ 9,895	$ 2,480
General and administrative	3,729	1,269	7,081	2,999
Restructuring expense		490		490
Total operating expenses	7,971	2,591	16,976	5,969
Loss from operations	(7,971)	(2,591)	(16,976)	(5,969)
Other income (expense), net	(1)	5	4	35
Warrant inducement expense				(4,829)
Loss before income tax benefit	(7,972)	(2,586)	(16,972)	(10,763)
Income tax benefit	(588)		(1,089)
Net loss and comprehensive loss	$ (7,384)	$ (2,586)	$ (15,883)	$ (10,763)
Net loss per share, basic and diluted	$ (0.50)	$ (2.74)	$ (1.07)	$ (11.31)
Weighted-average common shares outstanding, basic and diluted	14,815,731	943,419	14,823,348	951,352