CONDENSED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Statement [Abstract]
Collaboration revenue	$ 4	$ 0	$ 4	$ 0
Operating expenses:
Research and development	5,186	5,937	11,689	11,518
General and administrative	3,045	3,429	6,213	6,935
Gain on lease modification	(245)	(133)	(245)	(133)
Total operating expenses	7,986	9,233	17,657	18,320
Loss from operations	(7,982)	(9,233)	(17,653)	(18,320)
Other income (expense):
Interest Expense	(1,068)	(740)	(1,921)	(1,425)
Other income, net	277	41	753	25
Other income (expense), net	(791)	(699)	(1,168)	(1,400)
Net loss	$ (8,773)	$ (9,932)	$ (18,821)	$ (19,720)
Earnings per share, Basic	$ (0.04)	$ (0.05)	$ (0.08)	$ (0.09)
Earnings per share, Diluted	$ (0.04)	$ (0.05)	$ (0.08)	$ (0.09)
Weighted Average Number Of Shares Outstanding Basic	239,797,574	214,998,893	239,738,789	214,972,876
Weighted Average Number Of Diluted Shares Outstanding	239,797,574	214,998,893	239,738,789	214,972,876