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
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, 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 paid in PIK shares (in shares)																		2,271
Net loss																			(9,841)
Balances (in shares) at Jun. 30, 2021													38,090	0	10,591,716
Balances at Jun. 30, 2021													$ 0	$ 0	$ 1	254,781	(229,667)		25,115
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
Dividend on Series B convertible preferred stock													$ 0	$ 0	$ 0	(1,154)	0		(1,154)
Dividend on Series B convertible preferred stock paid in PIK shares (in shares)													1,153	0	0			1,153
Dividend on Series B convertible preferred stock paid in PIK shares													$ 0	$ 0	$ 0	1,153	0		1,153
Stock-based compensation expense													0	0	0	867	0		867
Net loss													$ 0	$ 0	$ 0	0	(4,050)		(4,050)
Issuance of stock (in shares)													0		250,000
January 2021 Offering, net issuance costs													$ 0		$ 0	704	0		704
Transaction costs in connection with Purchase Agreement with LPC													0	0	0	(31)	0		(31)
Purchase Agreement with LPC													$ 0	$ 0	$ 0	86	0		86
Balances (in shares) at Jun. 30, 2021													38,090	0	10,591,716
Balances at Jun. 30, 2021													$ 0	$ 0	$ 1	254,781	(229,667)		25,115
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
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
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 paid in PIK shares (in shares)																		2,565
Net loss																			(11,685)
Balances (in shares) at Jun. 30, 2022													43,069	0	10,665,042
Balances at Jun. 30, 2022													$ 0	$ 0	$ 1	258,813	(253,538)		5,276
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
Dividend on Series B convertible preferred stock													$ 0	$ 0	$ 0	(1,305)	0		(1,305)
Dividend on Series B convertible preferred stock paid in PIK shares (in shares)													1,302	0	0			1,302
Dividend on Series B convertible preferred stock paid in PIK shares													$ 0	$ 0	$ 0	1,302	0		1,302
Stock-based compensation expense													$ 0	$ 0	$ 0	909	0		909
Issuance of common shares from employee stock purchase plan (in shares)													0	0	24,505
Issuance of common shares from employee stock purchase plan													$ 0	$ 0	$ 0	13	0		13
Net loss													$ 0	$ 0	$ 0	0	(5,799)		(5,799)
Balances (in shares) at Jun. 30, 2022													43,069	0	10,665,042
Balances at Jun. 30, 2022													$ 0	$ 0	$ 1	$ 258,813	$ (253,538)		$ 5,276