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Condensed Consolidated Statements of Stockholders' Deficit (Unaudited) - USD ($)
$ in Thousands
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]
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]
Preferred Class A [Member]
Common Stock [Member]
Preferred Class A [Member]
Preferred Stock [Member]
Preferred Class A [Member]
Additional Paid-in Capital [Member]
Preferred Class A [Member]
Retained Earnings [Member]
Preferred Class A [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                                         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 $ 3,919 $ 0 $ 3,923           $ 0 $ 1 $ 39,735 $ 0 $ 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                                                 (25,307)
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)
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)
Balance (in shares) at Dec. 31, 2020                                         36,902,361 7,531      
Balance at Dec. 31, 2020                                         $ 368 $ 1 513,744 (539,414) (25,301)
Stock-based compensation expense (in shares)                                         72,229 0      
Stock-based compensation expense                                         $ 1 $ 0 147 0 148
Reclassification of warrant liability                                         0 0 3,179 0 3,179
Issuance of shares (in shares) 1,368,362 0                                              
Issuance of shares $ 13 $ 0 14,853 0 14,866                                        
Net loss and comprehensive loss                                         $ 0 $ 0 0 (5,944) (5,944)
Balance (in shares) at Mar. 31, 2021                                         38,342,952 7,531      
Balance at Mar. 31, 2021                                         $ 382 $ 1 531,923 (545,358) (13,052)
Balance (in shares) at Dec. 31, 2020                                         36,902,361 7,531      
Balance at Dec. 31, 2020                                         $ 368 $ 1 513,744 (539,414) (25,301)
Net loss and comprehensive loss                                                 (17,506)
Balance (in shares) at Jun. 30, 2021                                         40,618,400 6,281      
Balance at Jun. 30, 2021                                         $ 405 $ 1 551,449 (556,920) (5,065)
Balance (in shares) at Mar. 31, 2021                                         38,342,952 7,531      
Balance at Mar. 31, 2021                                         $ 382 $ 1 531,923 (545,358) (13,052)
Stock-based compensation expense (in shares)                                         6,812 0      
Stock-based compensation expense                                         $ 0 $ 0 3,293 0 3,293
Issuance of shares (in shares) 115,956 0       1,219,512 0                                    
Issuance of shares $ 1 $ 0 $ 1,412 $ 0 $ 1,413 $ 12 $ 0 $ 14,062 $ 0 $ 14,074                              
Net loss and comprehensive loss                                         $ 0 $ 0 0 (11,562) (11,562)
Issuance of shares pursuant to exercise of warrants (in shares)                                         362,500 0      
Issuance of shares pursuant to exercise of warrants                                         $ 4 $ 0 0 0 4
Conversion of preferred shares to common shares (in shares)                                         506,312 (1,250)      
Conversion of preferred shares to common shares                                         $ 5 $ 0 (5) 0 0
Issuance of shares to lenders (in shares)                               64,356 0                
Issuance of shares to lenders                               $ 1 $ 0 $ 764 $ 0 $ 765          
Balance (in shares) at Jun. 30, 2021                                         40,618,400 6,281      
Balance at Jun. 30, 2021                                         $ 405 $ 1 $ 551,449 $ (556,920) $ (5,065)