CONDENSED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Statement [Abstract]
Revenue	$ 0	$ 0	$ 6	$ 4
Operating expenses:
Research and development	143	3,656	448	15,346
General and administrative	1,007	3,578	3,615	9,791
Gain on lease modification	0	0	0	(245)
Restructuring costs	0	419	0	419
Property and equipment and right-of-use assets impairment	0	1,011	0	1,011
Total operating expenses	1,150	8,664	4,063	26,322
Loss from operations	(1,150)	(8,664)	(4,057)	(26,318)
Other income (expense):
Interest expense	0	0	0	(1,921)
Other income, net	23	188	120	942
Other income (expense), net	23	188	120	(979)
Net loss	$ (1,127)	$ (8,476)	$ (3,937)	$ (27,297)
Net loss per share , basic	$ (0.7)	$ (5.3)	$ (2.46)	$ (17.07)
Net loss per share , diluted	$ (0.7)	$ (5.3)	$ (2.46)	$ (17.07)
Weighted average common shares outstanding, basic	1,601,252	1,600,306	1,601,252	1,598,948
Weighted average common shares outstanding, diluted	1,601,252	1,600,306	1,601,252	1,598,948