CONDENSED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid In Capital	Accumulated Deficit
Balance at Dec. 31, 2021	$ 58,057	$ 216	$ 900,693	$ (842,852)
Balance (in shares) at Dec. 31, 2021		216,127,443
Stock-based compensation	853		853
Cancelled restricted common stock (in shares)		(176,882)
Net loss	(9,788)			(9,788)
Balance at Mar. 31, 2022	49,122	$ 216	901,546	(852,640)
Balance (in shares) at Mar. 31, 2022		215,950,561
Balance at Dec. 31, 2022	38,555	$ 240	918,942	(880,627)
Balance (in shares) at Dec. 31, 2022		240,410,761
Stock-based compensation	910		910
Issuance of common stock, net of expenses	92	$ 1	91
Issuance of common stock, net of expenses (in shares)		216,294
Net loss	(10,048)			(10,048)
Balance at Mar. 31, 2023	$ 29,509	$ 241	$ 919,943	$ (890,675)
Balance (in shares) at Mar. 31, 2023		240,627,055