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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Conversion of Series B Convertible Preferred Stock into Common Stock [Member]
Preferred Stock [Member]
Series C Convertible Preferred Stock [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]
Series C Convertible Preferred Stock [Member]
Conversion of Series B Convertible Preferred Stock into Common Stock [Member]
Preferred Stock Additional Paid-in Capital [Member]
Series B Convertible Preferred Stock [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]
Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Preferred Stock [Member]
Series C Convertible Preferred Stock [Member]
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]
Series C Convertible Preferred Stock [Member]
Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Preferred Stock Additional Paid-in Capital [Member]
Series B Convertible Preferred Stock [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]
Preferred Stock [Member]
Series C Convertible Preferred Stock [Member]
Preferred Stock [Member]
Series B Convertible Preferred Stock [Member]
Preferred Stock Additional Paid-in Capital [Member]
Series C Convertible Preferred Stock [Member]
Preferred Stock Additional Paid-in Capital [Member]
Series B Convertible Preferred Stock [Member]
Common Stock [Member]
Common Stock, Additional Paid-in Capital [Member]
Retained Earnings [Member]
Total
Balance (in shares) at Dec. 31, 2019                                 0 1,000     9,131,000      
Balance at Dec. 31, 2019                                 $ 0 $ 0 $ 0 $ 671 $ 1,644 $ 104,912 $ (94,071) $ 13,156
Issuance of common stock, shares (in shares)                                 0 0     1,328,000      
Issuance of common stock                                 $ 0 $ 0 0 0 $ 239 4,426 0 4,665
Issuance of common stock and warrants, shares (in shares)                                 0 0     31,575,000      
Issuance of common stock and warrants                                 $ 0 $ 0 0 0 $ 5,684 23,991 0 29,675
Allocation of common stock proceeds to warrant liability                                 $ 0 $ 0 0 0 $ 0 (8,196) 0 (8,196)
Issuance of Series C convertible preferred stock and warrants (in shares)                                 5,000 0     0      
Issuance of Series C convertible preferred stock and warrants, net of issuance costs of $260                                 $ 0 $ 0 5,165 0 $ 0 0 0 5,165
Allocation of Series C convertible preferred stock to beneficial conversion feature and warrant liability                                 0 0 (4,243) 0 0 1,769 0 (2,474)
Deemed dividend on Series C convertible preferred stock                                 0 0 4,503 0 0 (4,503) 0 0
Conversion of Series B convertible preferred stock to common stock $ 0 $ 0 $ 0 $ (50) $ 2 $ 48 $ 0 $ 0                 $ 0 $ 0 (5,425) 0 $ 976 4,449 0 0
Conversion of Series B convertible preferred stock to common stock (in shares)   0     15,000     50.000                 (5,000) 0     5,425,000      
Common stock issued for option exercises (in shares)                                 0 0     225,000      
Common stock issued for option exercises                                 $ 0 $ 0 0 0 $ 41 501 0 542
Shares withheld related to cashless exercise of options and taxes (in shares)                                 0 0     (149,000)      
Shares withheld related to cashless exercise of options and taxes                                 $ 0 $ 0 0 0 $ (27) (529) 0 (556)
Compensation cost for stock options granted                                 0 0   3,019 0 3,019
Net loss                                 $ 0 $ 0 0 0 $ 0 0 (17,828) (17,828)
Balance (in shares) at Dec. 31, 2020                                 0 1,000     47,550,000      
Balance at Dec. 31, 2020                 $ 0 $ 0 $ 0 $ 0 $ 0 $ 9,732 $ 3,271 $ 13,003 $ 0 $ 0 0 621 $ 8,559 129,887 (111,899) 27,168
Issuance of common stock and warrants, shares (in shares)                                 0 0     41,211,000      
Issuance of common stock and warrants                                 $ 0 $ 0 0 0 $ 7,418 62,250 0 $ 69,668
Conversion of Series B convertible preferred stock to common stock $ 0 $ 0 $ 0 $ (39) $ 2 $ 37 $ 0 $ 0                                
Conversion of Series B convertible preferred stock to common stock (in shares) 0 0     11,000     39.000                                
Common stock issued for option exercises (in shares)                                 0 0     699,000     699,000
Common stock issued for option exercises                                 $ 0 $ 0 0 0 $ 126 1,598 0 $ 1,724
Shares withheld related to cashless exercise of options and taxes (in shares)                                 0 0     (298,000)      
Shares withheld related to cashless exercise of options and taxes                                 $ 0 $ 0 0 0 $ (54) (1,852) 0 (1,906)
Compensation cost for stock options granted                                 0 0 0 0 0 5,267 0 5,267
Net loss                                 $ 0 $ 0 0 0 $ 0 0 (20,606) $ (20,606)
Issuance of common stock upon warrant exercise (in shares)                                 0 0     37,451,000     37,451,000
Issuance of common stock upon warrant exercise                                 $ 0 $ 0 0 0 $ 6,741 37,077 0 $ 43,818
Balance (in shares) at Dec. 31, 2021                                 0 1,000     126,624,000      
Balance at Dec. 31, 2021                                 $ 0 $ 0 $ 0 $ 582 $ 22,792 $ 243,996 $ (129,234) $ 138,136