Condensed Statements of Operations and Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating expenses
Research and development	$ 7,690	$ 10,701
General and administrative	4,027	4,664
Impairment of property and equipment	3,418	0
Total operating expenses	15,135	15,365
Loss from operations	(15,135)	(15,365)
Interest income	945	13
Other income (loss), net	(14)	1
Net loss	(14,204)	(15,351)
Comprehensive income (loss):
Unrealized gain on available-for-sale securities	39	0
Comprehensive loss	$ (14,165)	$ (15,351)
Net loss per share – basic (in dollars per share)	$ (0.26)	$ (0.28)
Net loss per share – diluted (in dollars per share)	$ (0.26)	$ (0.28)
Basic weighted average common shares outstanding (in shares)	55,420,912	55,143,537
Diluted weighted average common shares outstanding (in shares)	55,420,912	55,143,537