CONDENSED CONSOLIDATED 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	$ 6,827	$ 5,299	$ 12,847	$ 12,735
General and administrative	4,899	2,555	9,782	6,733
Total operating expenses	11,726	7,854	22,629	19,468
Loss from operations	(11,726)	(7,854)	(22,629)	(19,468)
Other income:
Interest income	75	22	108	101
Other income, net		25		25
Total other income, net	75	47	108	126
Net loss	(11,651)	(7,807)	(22,521)	(19,342)
Cumulative dividends on convertible preferred stock		(2,749)	(2,309)	(5,498)
Net loss attributable to common stockholders	$ (11,651)	$ (10,556)	$ (24,830)	$ (24,840)
Net loss per share attributable to common stockholders, basic and diluted	$ (0.47)	$ (22.49)	$ (1.34)	$ (54.12)
Weighted average shares of common stock outstanding, basic and diluted	24,865,112	469,348	18,520,536	458,982
Comprehensive loss:
Net loss	$ (11,651)	$ (7,807)	$ (22,521)	$ (19,342)
Other comprehensive gain (loss):
Unrealized gain (loss) on available-for-sale securities, net of tax of $0	26	(1)	6	(10)
Total other comprehensive gain (loss)	26	(1)	6	(10)
Comprehensive loss	$ (11,625)	$ (7,808)	$ (22,515)	$ (19,352)