CONSOLIDATED STATEMENTS OF CHANGES IN REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands	Preferred Stock [Member] Series A 12% Convertible Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Deficit [Member]	Total
Beginning balance at Dec. 31, 2020					$ 1,723
Beginning balance (in shares) at Dec. 31, 2020					176
Ending balance at Dec. 31, 2021					$ 1,723
Ending balance (in shares) at Dec. 31, 2021					176
Beginning balance at Dec. 31, 2020	$ 527	$ 56	$ 261,883	$ (239,996)	$ 22,470
Beginning balance (in shares) at Dec. 31, 2020	1,302,500	57,077,055
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Series A 12% convertible preferred stock dividend			79	(79)
Series A 12% convertible preferred stock dividend (in shares)		26,050
Series C super dividend redeemable convertible preferred stock dividend			92	(92)
Series C super dividend redeemable convertible preferred stock dividend (in shares)		31,112
Issuance of common stock		$ 1	3,863		3,864
Issuance of common stock for exercise of options (in shares)		845,214
Issuance of common stock for warrant exercises		$ 2	2,948		$ 2,950
Issuance of common stock for warrant exercises (in shares)		1,180,240
Issuance of common stock for stock option exercises (in shares)		148,941			148,941
Stock-based compensation expense			2,136		$ 2,136
Stock-based compensation expense (in shares)		32,693
Net loss				(30,527)	(30,527)
Ending balance at Dec. 31, 2021	$ 527	$ 59	271,001	(270,694)	893
Ending balance (in shares) at Dec. 31, 2021	1,302,500	59,341,305
Ending balance at Dec. 31, 2022					$ 1,723
Ending balance (in shares) at Dec. 31, 2022					176
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Series A 12% convertible preferred stock dividend			40	(40)
Series A 12% convertible preferred stock dividend (in shares)		25,625
Series C super dividend redeemable convertible preferred stock dividend			57	(57)
Series C super dividend redeemable convertible preferred stock dividend (in shares)		35,200
Issuance of common stock from conversion of Series A convertible preferred stock	$ (17)		17
Issuance of common stock from conversion of Series A convertible preferred stock (in shares)	(42,500)	7,287
Issuance of common stock for stock option exercises (in shares)					0
Issuance of common stock purchase warrants in connection with related party line of credit			899		$ 899
Stock-based compensation expense			3,067		3,067
Stock-based compensation expense (in shares)		16,588
Net loss				(38,776)	(38,776)
Ending balance at Dec. 31, 2022	$ 510	$ 59	$ 275,081	$ (309,567)	$ (33,917)
Ending balance (in shares) at Dec. 31, 2022	1,260,000	59,426,005