STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit
Beginning Balance (in shares) at Dec. 31, 2020		254,976
Beginning Balance at Dec. 31, 2020	$ 3,884	$ 0	$ 108,124	$ (104,240)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	765		765
Net proceeds received for issuance of common stock (in shares)		308,193
Net proceeds received for issuance of common stock	12,421		12,421
Net proceeds received for exchange of warrants for common stock (in shares)		46,148
Net proceeds received for exchange of warrants for common stock	1,250		1,250
Issuance of common stock for services (in shares)		1,047
Shares forfeited for payment of employee withholding taxes related to share based awards	(17)		(17)
Net loss	$ (8,268)			(8,268)
Ending Balance (in shares) at Dec. 31, 2021	610,364	610,364
Ending Balance at Dec. 31, 2021	$ 10,035	$ 1	122,542	(112,508)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	707		707
Net proceeds received for issuance of common stock and prefunding of warrants (in shares)		67,572
Net proceeds received for issuance of common stock and prefunding of warrants	4,228		4,228
Issuance of common stock upon exercise of warrants (in shares)		131,000
Issuance of common stock for services (in shares)		679
Issuance of common stock for services	$ 4		4
Issuance of common stock for fractional shares in the 20:1 reverse stock split (in shares)	33
Net loss	$ (9,695)			(9,695)
Ending Balance (in shares) at Dec. 31, 2022	809,648	809,648
Ending Balance at Dec. 31, 2022	$ 5,279	$ 1	$ 127,481	$ (122,203)