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	1,843		1,843
Restricted stock awards (in shares)		280,000
Cancelled restricted common stock (in shares)		(232,901)
Net loss	(19,720)			(19,720)
Balance at Jun. 30, 2022	40,180	$ 216	902,536	(862,572)
Balance (in shares) at Jun. 30, 2022		216,174,542
Balance at Mar. 31, 2022	49,122	$ 216	901,546	(852,640)
Balance (in shares) at Mar. 31, 2022		215,950,561
Stock-based compensation	990		990
Restricted stock awards (in shares)		280,000
Cancelled restricted common stock (in shares)		(56,019)
Net loss	(9,932)			(9,932)
Balance at Jun. 30, 2022	40,180	$ 216	902,536	(862,572)
Balance (in shares) at Jun. 30, 2022		216,174,542
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	1,824		1,824
Issuance of common stock, net of expenses (in shares)		216,294
Issuance of common stock, net of expenses	92	$ 1	91
Net loss	(18,821)			(18,821)
Balance at Jun. 30, 2023	21,650	$ 241	920,857	(899,448)
Balance (in shares) at Jun. 30, 2023		240,627,055
Balance at Mar. 31, 2023	29,509	$ 241	919,943	(890,675)
Balance (in shares) at Mar. 31, 2023		240,627,055
Stock-based compensation	914		914
Net loss	(8,773)			(8,773)
Balance at Jun. 30, 2023	$ 21,650	$ 241	$ 920,857	$ (899,448)
Balance (in shares) at Jun. 30, 2023		240,627,055