Condensed Statements of Operations and Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Operating expenses
Research and development	$ 617	$ 9,471	$ 7,880	$ 31,128
General and administrative	4,952	4,138	12,470	13,718
Impairment of property and equipment	0	0	3,418	0
Total operating expenses	5,569	13,609	23,768	44,846
Loss from operations	(5,569)	(13,609)	(23,768)	(44,846)
Interest income	1,043	559	2,968	766
Other income (loss), net	0	(22)	(15)	(32)
Net loss	(4,526)	(13,072)	(20,815)	(44,112)
Comprehensive income (loss):
Unrealized gain (loss) on available-for-sale securities	13	(20)	21	(92)
Comprehensive loss	$ (4,513)	$ (13,092)	$ (20,794)	$ (44,204)
Net loss per share – basic (in dollars per share)	$ (0.41)	$ (1.18)	$ (1.86)	$ (3.99)
Net loss per share – diluted (in dollars per share)	$ (0.41)	$ (1.18)	$ (1.86)	$ (3.99)
Basic weighted average common shares outstanding (in shares)	11,101,440	11,050,207	11,218,710	11,039,964
Diluted weighted average common shares outstanding (in shares)	11,101,440	11,050,207	11,218,710	11,039,964