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Statements of Stockholders' Equity (Deficit) - USD ($)
$ in Thousands
At Market Issuance Sales Agreement [Member]
Series A Preferred Stock [Member]
Preferred Stock [Member]
At Market Issuance Sales Agreement [Member]
Common Stock [Member]
At Market Issuance Sales Agreement [Member]
Preferred Stock [Member]
At Market Issuance Sales Agreement [Member]
Additional Paid-in Capital [Member]
At Market Issuance Sales Agreement [Member]
Retained Earnings [Member]
At Market Issuance Sales Agreement [Member]
Direct Offering [Member]
Series A Preferred Stock [Member]
Preferred Stock [Member]
Direct Offering [Member]
Common Stock [Member]
Direct Offering [Member]
Preferred Stock [Member]
Direct Offering [Member]
Additional Paid-in Capital [Member]
Direct Offering [Member]
Retained Earnings [Member]
Direct Offering [Member]
Shares Issued From Bond Conversion [Member]
Series A Preferred Stock [Member]
Preferred Stock [Member]
Shares Issued From Bond Conversion [Member]
Common Stock [Member]
Shares Issued From Bond Conversion [Member]
Preferred Stock [Member]
Shares Issued From Bond Conversion [Member]
Additional Paid-in Capital [Member]
Shares Issued From Bond Conversion [Member]
Retained Earnings [Member]
Shares Issued From Bond Conversion [Member]
Conversion of Preferred Shares to Common Shares [Member]
Series A Preferred Stock [Member]
Preferred Stock [Member]
Conversion of Preferred Shares to Common Shares [Member]
Common Stock [Member]
Conversion of Preferred Shares to Common Shares [Member]
Preferred Stock [Member]
Conversion of Preferred Shares to Common Shares [Member]
Additional Paid-in Capital [Member]
Conversion of Preferred Shares to Common Shares [Member]
Retained Earnings [Member]
Conversion of Preferred Shares to Common Shares [Member]
Series A Preferred Stock [Member]
Lenders [Member]
Preferred Stock [Member]
Series A Preferred Stock [Member]
Common Stock [Member]
Series A Preferred Stock [Member]
Preferred Stock [Member]
Series A Preferred Stock [Member]
Additional Paid-in Capital [Member]
Series A Preferred Stock [Member]
Retained Earnings [Member]
Series A Preferred Stock [Member]
Lenders [Member]
Common Stock [Member]
Lenders [Member]
Preferred Stock [Member]
Lenders [Member]
Additional Paid-in Capital [Member]
Lenders [Member]
Retained Earnings [Member]
Lenders [Member]
Common Stock [Member]
Preferred Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Total
Balance (in shares) at Dec. 31, 2019                                                     0                 28,480,567 0      
Balance at Dec. 31, 2019                                                     $ 0                 $ 285 $ 0 $ 419,194 $ (501,597) $ (82,118)
Issuance of shares (in shares) 0 1,508,013 0                                               0                 0 10,000      
Issuance of shares $ 0 $ 15 $ 0 $ 14,752 $ 0 $ 14,767                                         $ 0                 $ 0 $ 1 39,735 0 39,736
Conversion of securities (in shares)                         0 5,766,337 0       0 1,000,068 (2,469)                                      
Conversion of securities                         $ 0 $ 57 $ 0 $ 38,843 $ 0 $ 38,900 $ 0 $ 10 $ 0 $ (10) $ 0 $ 0                                
Reclassification of warrant liability                                                     $ 0                 $ 0 $ 0 (865) 0 (865)
Conversion of securities                         $ 0 $ 57 $ 0 $ 38,843 $ 0 $ 38,900 $ 0 $ 10 $ 0 (10) 0 0                                
Stock-based compensation expense (in shares)                                                     0                 147,376 0      
Stock-based compensation expense                                                     $ 0                 $ 1 $ 0 2,095 0 2,096
Net loss and comprehensive loss                                                     $ 0                 $ 0 $ 0 0 (37,817) (37,817)
Balance (in shares) at Dec. 31, 2020                                                     0                 36,902,361 7,531      
Balance at Dec. 31, 2020                                                     $ 0                 $ 368 $ 1 513,744 (539,414) (25,301)
Issuance of shares (in shares) 0 1,649,318 0       0 1,219,512 0                                   2,300                          
Issuance of shares $ 0 $ 17 $ 0 $ 18,366 $ 0 $ 18,383 $ 0 $ 12 $ 0 $ 14,062 $ 0 $ 14,074                           $ 0 $ 0 $ 54,209 $ 0 $ 54,209                    
Conversion of securities (in shares)                                     0 2,917,167 (7,202)                                      
Conversion of securities                                     $ 0 $ 29 $ 0 (29) 0 0                                
Reclassification of warrant liability                                                     $ 0                 $ 0 $ 0 3,179 0 3,179
Conversion of securities                                     $ 0 $ 29 $ 0 $ (29) $ 0 $ 0                                
Stock-based compensation expense (in shares)                                                     0                 83,072 0      
Stock-based compensation expense                                                     $ 0                 $ 1 $ 0 4,746 0 4,747
Net loss and comprehensive loss                                                     $ 0                 $ 0 $ 0 0 (31,249) (31,249)
Issuance of restricted stock units (in shares)                                                     0                 158,673 0      
Issuance of restricted stock units                                                     $ 0                 $ 1 $ 0 0 0 1
Net settlement for taxes related to equity awards                                                     $ 0                 $ 0 $ 0 (1,184) 0 (1,184)
Issuance of shares pursuant to exercise of warrants (in shares)                                                     0                 362,500 0      
Issuance of shares pursuant to exercise of warrants                                                     $ 0                 $ 4 $ 0 0 0 4
Issuance of warrants                                                     0                 0 0 1,795 0 1,795
Issuance of shares to lenders (in shares)                                                 0           363,566 0                
Issuance of shares to lenders                                                 $ 0           $ 4 $ 0 $ 4,613 $ 0 $ 4,617          
Dividends paid and declared                                                     0                 0 0 0 (2,737) (2,737)
Cancellation of stock options to consultants                                                     $ 0                 $ 0 $ 0 71 0 71
Balance (in shares) at Dec. 31, 2021                                                     2,300                 43,656,169 329      
Balance at Dec. 31, 2021                                                     $ 0                 $ 436 $ 1 $ 613,572 $ (573,400) $ 40,609