Condensed Consolidated Statements Convertible Preferred Stock and Stockholders' Equity (Deficit) (Unaudited) - USD ($) $ in Thousands	Total	Preferred Stock Member	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]
Balance (in shares) at Dec. 31, 2021		200,000	284,780
Balance at Dec. 31, 2021	$ 7,365	$ 2	$ 3	$ 102,002	$ (94,642)
Net loss	(4,205)				(4,205)
Stock-based compensation expense	358			358
Issuance of common stock upon warrant exercises (in shares)			79,886
Issuance of common stock upon warrant exercises	1,274		$ 1	1,273
Balance (in shares) at Mar. 31, 2022		200,000	364,666
Balance at Mar. 31, 2022	4,792	$ 2	$ 4	103,633	(98,847)
Balance (in shares) at Dec. 31, 2022		200,000	2,944,306
Balance at Dec. 31, 2022	12,479	$ 2	$ 30	121,637	(109,190)
Net loss	(2,340)				(2,340)
Stock-based compensation expense	93			93
Issuance of common stock upon warrant exercises (in shares)			1,142,829
Issuance of common stock upon warrant exercises	1,349		$ 11	1,338
Issuance of common stock warrants related to promissory note (in shares)			476,842
Issuance of common stock warrants related to promissory note	2,166		$ 5	2,161
Balance (in shares) at Mar. 31, 2023		200,000	4,563,977
Balance at Mar. 31, 2023	$ 13,747	$ 2	$ 46	$ 125,229	$ (111,530)