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Condensed Consolidated Statements of Stockholders' Deficit (Unaudited) - USD ($)
$ in Thousands
Common Stock [Member]
At Market Issuance Sales Agreement [Member]
Common Stock [Member]
Direct Offering [Member]
Common Stock [Member]
Preferred Class A [Member]
Common Stock [Member]
Series A Preferred Stock [Member]
Common Stock [Member]
Lenders [Member]
Common Stock [Member]
Preferred Stock [Member]
At Market Issuance Sales Agreement [Member]
Series A Preferred Stock [Member]
Preferred Stock [Member]
At Market Issuance Sales Agreement [Member]
Preferred Stock [Member]
Direct Offering [Member]
Series A Preferred Stock [Member]
Preferred Stock [Member]
Direct Offering [Member]
Preferred Stock [Member]
Preferred Class A [Member]
Preferred Stock [Member]
Series A Preferred Stock [Member]
Lenders [Member]
Preferred Stock [Member]
Series A Preferred Stock [Member]
Preferred Stock [Member]
Lenders [Member]
Preferred Stock [Member]
Additional Paid-in Capital [Member]
At Market Issuance Sales Agreement [Member]
Additional Paid-in Capital [Member]
Direct Offering [Member]
Additional Paid-in Capital [Member]
Preferred Class A [Member]
Additional Paid-in Capital [Member]
Series A Preferred Stock [Member]
Additional Paid-in Capital [Member]
Lenders [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
At Market Issuance Sales Agreement [Member]
Retained Earnings [Member]
Direct Offering [Member]
Retained Earnings [Member]
Preferred Class A [Member]
Retained Earnings [Member]
Series A Preferred Stock [Member]
Retained Earnings [Member]
Lenders [Member]
Retained Earnings [Member]
At Market Issuance Sales Agreement [Member]
Direct Offering [Member]
Preferred Class A [Member]
Series A Preferred Stock [Member]
Lenders [Member]
Total
Balance (in shares) at Dec. 31, 2019           28,480,567                 0                                    
Balance at Dec. 31, 2019           $ 285                 $ 0           $ 419,194           $ (501,597)           $ (82,118)
Stock-based compensation expense (in shares)           116,134                 0                                    
Stock-based compensation expense           $ 1                 $ 0           1,250           0           1,251
Reclassification of warrant liability           0                 0           (865)           0           (865)
Issuance of shares (in shares) 408,992   0         0     10,000                                            
Issuance of shares $ 4   $ 0         $ 0     $ 1         $ 3,919   $ 39,735       $ 0   $ 0       $ 3,923   $ 39,736      
Net loss and comprehensive loss           $ 0                 $ 0           0           (20,514)           (20,514)
Conversion of preferred shares to common shares (in shares)           5,766,337                 0                                    
Conversion of preferred shares to common shares           $ 57                 $ 0           38,843           0           38,900
Balance (in shares) at Mar. 31, 2020           34,772,030                 10,000                                    
Balance at Mar. 31, 2020           $ 347                 $ 1           502,076           (522,111)           (19,687)
Balance (in shares) at Dec. 31, 2019           28,480,567                 0                                    
Balance at Dec. 31, 2019           $ 285                 $ 0           419,194           (501,597)           (82,118)
Net loss and comprehensive loss                                                                 (29,800)
Balance (in shares) at Sep. 30, 2020           35,401,834                 10,000                                    
Balance at Sep. 30, 2020           $ 353                 $ 1           508,527           (531,397)           (22,516)
Balance (in shares) at Mar. 31, 2020           34,772,030                 10,000                                    
Balance at Mar. 31, 2020           $ 347                 $ 1           502,076           (522,111)           (19,687)
Stock-based compensation expense (in shares)           25,032                 0                                    
Stock-based compensation expense           $ 0                 $ 0           300           0           300
Net loss and comprehensive loss           $ 0                 $ 0           0           (4,793)           (4,793)
Balance (in shares) at Jun. 30, 2020           34,797,062                 10,000                                    
Balance at Jun. 30, 2020           $ 347                 $ 1           502,376           (526,904)           (24,180)
Stock-based compensation expense (in shares)           2,448                 0                                    
Stock-based compensation expense           $ 0                 $ 0           273           0           273
Issuance of shares (in shares) 602,324             0                                                  
Issuance of shares $ 6             $ 0               5,878           0           5,884          
Net loss and comprehensive loss           $ 0                 $ 0           0           (4,493)           (4,493)
Balance (in shares) at Sep. 30, 2020           35,401,834                 10,000                                    
Balance at Sep. 30, 2020           $ 353                 $ 1           508,527           (531,397)           (22,516)
Balance (in shares) at Dec. 31, 2020           36,902,361             0   7,531                                    
Balance at Dec. 31, 2020           $ 368             $ 0   $ 1           513,744           (539,414)           (25,301)
Stock-based compensation expense (in shares)           72,229             0   0                                    
Stock-based compensation expense           $ 1             $ 0   $ 0           147           0           148
Reclassification of warrant liability           0             0   0           3,179           0           179
Issuance of shares (in shares) 1,368,362           0 0                                                  
Issuance of shares $ 13           $ 0 $ 0               14,853           0           14,866          
Net loss and comprehensive loss           $ 0             $ 0   $ 0           0           (5,944)           (5,944)
Balance (in shares) at Mar. 31, 2021           38,342,952             0   7,531                                    
Balance at Mar. 31, 2021           $ 382             $ 0   $ 1           531,923           (545,358)           (13,052)
Balance (in shares) at Dec. 31, 2020           36,902,361             0   7,531                                    
Balance at Dec. 31, 2020           $ 368             $ 0   $ 1           513,744           (539,414)           (25,301)
Net loss and comprehensive loss                                                                 (25,345)
Balance (in shares) at Sep. 30, 2021           42,508,398             2,300   3,156                                    
Balance at Sep. 30, 2021           $ 424             $ 0   $ 1           612,902           (566,208)           47,119
Balance (in shares) at Mar. 31, 2021           38,342,952             0   7,531                                    
Balance at Mar. 31, 2021           $ 382             $ 0   $ 1           531,923           (545,358)           (13,052)
Stock-based compensation expense (in shares)           6,812             0   0                                    
Stock-based compensation expense           $ 0             $ 0   $ 0           3,293           0           3,293
Issuance of shares (in shares) 115,956 1,219,512         0 0 0 0                                              
Issuance of shares $ 1 $ 12         $ 0 $ 0 $ 0 $ 0           1,412 $ 14,062         0 $ 0         1,413 $ 14,074        
Net loss and comprehensive loss           $ 0             $ 0   $ 0           0           (11,562)           (11,562)
Issuance of shares pursuant to exercise of warrants (in shares)           362,500             0   0                                    
Issuance of shares pursuant to exercise of warrants           $ 4             $ 0   $ 0           0           0           4
Conversion of preferred shares to common shares (in shares)           506,312             0   (1,250)                                    
Conversion of preferred shares to common shares           $ 5             $ 0   $ 0           (5)           0           0
Issuance of shares to lenders (in shares)         64,356             0   0                                      
Issuance of shares to lenders         $ 0             $ 0   $ 0           $ 764           $ 0           $ 765  
Balance (in shares) at Jun. 30, 2021           40,618,400             0   6,281                                    
Balance at Jun. 30, 2021           $ 405             $ 0   $ 1           551,449           (556,920)           (5,065)
Stock-based compensation expense (in shares)           1,335             0   0                                    
Stock-based compensation expense           $ 0             $ 0   $ 0           697           0           697
Issuance of shares (in shares) 165,000           0 0         2,300                                        
Issuance of shares $ 2     $ 0     $ 0 $ 0         $ 0     $ 2,101     $ 54,209     $ 0     $ 0     $ 2,103     $ 54,209    
Net loss and comprehensive loss           $ 0             $ 0   $ 0           0           (7,839)           (7,839)
Conversion of preferred shares to common shares (in shares)           1,265,780             0   (3,125)                                    
Conversion of preferred shares to common shares           $ 13             $ 0   $ 0           (13)           0           0
Issuance of shares to lenders (in shares)           299,210             0   0                                    
Issuance of shares to lenders           $ 3             $ 0   $ 0           3,848                     3,851
Issuance of restricted stock units (in shares)           158,673             0   0                                    
Issuance of restricted stock units           $ 1             $ 0   $ 0           0           0           1
Net settlement for taxes related to equity awards           0             0   0           (1,184)                     (1,184)
Issuance of warrants           0             0   0           1,795           0           1,795
Dividends declared on 8.875% series A cumulative perpetual preferred shares ($630.00 per share)           $ 0             $ 0   $ 0           0           (1,449)           (1,449)
Balance (in shares) at Sep. 30, 2021           42,508,398             2,300   3,156                                    
Balance at Sep. 30, 2021           $ 424             $ 0   $ 1           $ 612,902           $ (566,208)           $ 47,119