Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Cumulative Effect, Period of Adoption, Adjusted Balance [Member] Preferred Stock [Member] Series B Convertible Preferred Stock [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member] Preferred Stock Additional Paid-in Capital [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member] Common Stock [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member] Common Stock, Additional Paid-in Capital [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member] Retained Earnings [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member]	Conversion of Series B Convertible Preferred Stock into Common Stock [Member] Preferred Stock [Member] Series B Convertible Preferred Stock [Member]	Conversion of Series B Convertible Preferred Stock into Common Stock [Member] Preferred Stock Additional Paid-in Capital [Member]	Conversion of Series B Convertible Preferred Stock into Common Stock [Member] Common Stock [Member]	Conversion of Series B Convertible Preferred Stock into Common Stock [Member] Common Stock, Additional Paid-in Capital [Member]	Conversion of Series B Convertible Preferred Stock into Common Stock [Member] Retained Earnings [Member]	Conversion of Series B Convertible Preferred Stock into Common Stock [Member]	Preferred Stock [Member] Series B Convertible Preferred Stock [Member]	Preferred Stock Additional Paid-in Capital [Member]	Common Stock [Member]	Common Stock, Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Dec. 31, 2020													1,000		47,550,000
Balance at Dec. 31, 2020	$ 0	$ 0	$ 0	$ 9,732	$ 3,271	$ 13,003							$ 0	$ 621	$ 8,559	$ 129,887	$ (111,899)	$ 27,168
Issuance of common stock and warrants													$ 0	0	$ 7,418	62,250	0	$ 69,668
Issuance of common stock and warrants (in shares)															41,211,000
Issuance of common stock upon warrant exercise (in shares)													0		37,451,000			37,451,000
Issuance of common stock upon warrant exercise													$ 0	0	$ 6,741	37,077	0	$ 43,818
Conversion of Series B convertible preferred stock to common stock							$ 0	$ (39)	$ 2	$ 37	$ 0	$ 0
Conversion of Series B convertible preferred stock to common stock (in shares)									11,000			39.000
Common stock issued for option exercises (in shares)													0		699,000
Common stock issued for option exercises													$ 0	0	$ 126	1,598	0	1,724
Shares withheld related to cashless exercise of options and taxes (in shares)													0		(298,000)
Shares withheld related to cashless exercise of options and taxes													$ 0	0	$ (54)	(1,852)	0	(1,906)
Compensation cost for stock options granted													0	0	0	5,267	0	5,267
Net loss													$ 0	0	$ 0	0	(20,606)	(20,606)
Balance (in shares) at Dec. 31, 2021													1,000		126,624,000
Balance at Dec. 31, 2021													$ 0	582	$ 22,792	243,996	(129,234)	$ 138,136
Conversion of Series B convertible preferred stock to common stock (in shares)												0
Common stock issued for option exercises (in shares)																		(0)
Compensation cost for stock options granted													0	0	0	6,788	0	$ 6,788
Net loss													$ 0	0	$ 0	0	(26,960)	(26,960)
Balance (in shares) at Dec. 31, 2022													1,000		126,624,000
Balance at Dec. 31, 2022													$ 0	$ 582	$ 22,792	$ 250,784	$ (156,194)	$ 117,964