Condensed Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
OPERATING EXPENSES:
Research and development	$ 15,396	$ 14,802	$ 30,426	$ 29,250
General and administrative	6,125	11,073	14,196	20,824
Total operating expenses	21,521	25,875	44,622	50,074
LOSS FROM OPERATIONS	(21,521)	(25,875)	(44,622)	(50,074)
OTHER INCOME (EXPENSE), NET:
Interest income	111	169	187	245
Change in fair value of warrant liabilities	(4,357)		(4,357)
Other expense	(90)	(122)	(186)	(178)
Total other income (expense), net	(4,336)	47	(4,356)	67
Net loss	(25,857)	(25,828)	(48,978)	(50,007)
Net loss attributable to common stockholders-basic	(25,857)	(25,828)	(48,978)	(50,007)
Net loss attributable to common stockholders-diluted	$ (25,857)	$ (25,828)	$ (48,978)	$ (50,007)
Net loss per share attributable to common stockholders-basic (in dollars per share)	$ (0.96)	$ (0.99)	$ (1.84)	$ (1.99)
Net loss per share attributable to common stockholders-diluted (in dollars per share)	$ (0.96)	$ (0.99)	$ (1.84)	$ (1.99)
Weighted-average common stock outstanding-basic (in shares)	26,901,069	26,082,525	26,560,185	25,114,508
Weighted-average common stock outstanding-diluted (in shares)	26,901,069	26,082,525	26,560,185	25,114,508