Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	January 2021 Offering [Member] Preferred Stock [Member] Series B Preferred Stock [Member]	January 2021 Offering [Member] Preferred Stock [Member] Series C Preferred Stock [Member]	January 2021 Offering [Member] Common Stock [Member]	January 2021 Offering [Member] Additional Paid-in Capital [Member]	January 2021 Offering [Member] Retained Earnings [Member]	January 2021 Offering [Member]	Conversion of Series C Convertible Preferred Stock Into Common Stock [Member] Preferred Stock [Member] Series B Preferred Stock [Member]	Conversion of Series C Convertible Preferred Stock Into Common Stock [Member] Preferred Stock [Member] Series C Preferred Stock [Member]	Conversion of Series C Convertible Preferred Stock Into Common Stock [Member] Common Stock [Member]	Conversion of Series C Convertible Preferred Stock Into Common Stock [Member] Additional Paid-in Capital [Member]	Conversion of Series C Convertible Preferred Stock Into Common Stock [Member] Retained Earnings [Member]	Conversion of Series C Convertible Preferred Stock Into Common Stock [Member]	Preferred Stock [Member] Series B Preferred Stock [Member]	Preferred Stock [Member] Series C Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Series B Preferred Stock [Member]	Total
Balances (in shares) at Dec. 31, 2020													35,819	0	2,171,316
Balances at Dec. 31, 2020													$ 0	$ 0	$ 0	$ 226,800	$ (219,826)		$ 6,974
Dividend on Series B convertible preferred stock													$ 0	$ 0	$ 0	(1,119)	0		(1,119)
Dividend on Series B convertible preferred stock paid in PIK shares (in shares)													1,118	0	0			1,118
Dividend on Series B convertible preferred stock paid in PIK shares													$ 0	$ 0	$ 0	1,118	0		1,118
Stock-based compensation expense													0	0	0	810	0		810
Net loss													$ 0	$ 0	$ 0	0	(5,791)		(5,791)
Issuance of stock (in shares)	0	0	5,666,760
January 2021 Offering, net issuance costs	$ 0	$ 0	$ 1	$ 25,121	$ 0	$ 25,122
Conversion of convertible preferred stock into common stock (in shares)							0	0	2,450,880
Conversion of Series C convertible preferred stock into common stock							$ 0	$ 0	$ 0	$ 0	$ 0	$ 0
Issuance of common shares in connection with common warrant exercises (in shares)													0	0	52,760
Issuance of common shares in connection with common warrant exercises													$ 0	$ 0	$ 0	179	0		179
Modification of exercise price of warrants in connection with January 2021 Offering													0	0	0	287	0		287
Transaction costs in connection with Purchase Agreement with LPC													$ 0	$ 0	$ 0	(40)	0		(40)
Balances (in shares) at Mar. 31, 2021													36,937	0	10,341,716
Balances at Mar. 31, 2021													$ 0	$ 0	$ 1	253,156	(225,617)		27,540
Balances (in shares) at Dec. 31, 2021													40,504	0	10,619,846
Balances at Dec. 31, 2021													$ 0	$ 0	$ 1	256,918	(241,853)		15,066
Dividend on Series B convertible preferred stock													$ 0	$ 0	$ 0	(1,266)	0		(1,266)
Dividend on Series B convertible preferred stock paid in PIK shares (in shares)													1,263	0	0			1,263
Dividend on Series B convertible preferred stock paid in PIK shares													$ 0	$ 0	$ 0	1,263	0		1,263
Stock-based compensation expense													$ 0	$ 0	$ 0	960	0		960
Issuance of common shares from employee stock purchase plan (in shares)													0	0	20,691
Issuance of common shares from employee stock purchase plan													$ 0	$ 0	$ 0	19	0		19
Net loss													$ 0	$ 0	$ 0	0	(5,886)		(5,886)
Balances (in shares) at Mar. 31, 2022													41,767	0	10,640,537
Balances at Mar. 31, 2022													$ 0	$ 0	$ 1	$ 257,894	$ (247,739)		$ 10,156