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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (DEFICIT) (UNAUDITED) - USD ($)
$ in Thousands
Total
Convertible Notes
Warrant
Previously Reported
Retroactive application of recapitalization
Series 1 Convertible Preferred Stock
Series 1 Convertible Preferred Stock
Previously Reported
Series 1 Convertible Preferred Stock
Retroactive application of recapitalization
Common Stock
Common Stock
Convertible Notes
Common Stock
Warrant
Common Stock
Previously Reported
Common Stock
Retroactive application of recapitalization
Additional Paid-In Capital
Additional Paid-In Capital
Convertible Notes
Additional Paid-In Capital
Warrant
Additional Paid-In Capital
Previously Reported
Additional Paid-In Capital
Retroactive application of recapitalization
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss)
Previously Reported
Accumulated Other Comprehensive Income (Loss)
Retroactive application of recapitalization
Accumulated Deficit
Accumulated Deficit
Previously Reported
Accumulated Deficit
Retroactive application of recapitalization
Beginning balance (in shares) at Dec. 31, 2019 0     191,139,933 (191,139,933)                                      
Beginning balance at Dec. 31, 2019 $ 0     $ 231,129 $ (231,129)                                      
Ending balance (in shares) at Mar. 31, 2020 0                                              
Ending balance at Mar. 31, 2020 $ 0                                              
Beginning balance (in shares) at Dec. 31, 2019           0 2,961 (2,961) 43,189,195     9,392,682 33,796,513                      
Beginning balance at Dec. 31, 2019 (24,532)     $ (255,661) $ 231,129 $ 0 $ 0 $ 0 $ 3     $ 0 $ 3 $ 234,465     $ 3,339 $ 231,126 $ 54 $ 54 $ 0 $ (259,054) $ (259,054) $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                
Effect of exchange transaction (in shares)                 (3,448,648)                              
Effect of exchange transaction (3,268)                         (10,605)               7,337    
Issuance of common stock upon exercise of stock options and warrants (in shares)                 15,457                              
Issuance of common stock upon exercise of stock options and warrants 21                         21                    
Stock-based compensation 456                         456                    
Foreign currency translation adjustment 451                                   451          
Net loss (17,471)                                         (17,471)    
Ending balance (in shares) at Mar. 31, 2020           0     39,756,004                              
Ending balance at Mar. 31, 2020 $ (44,343)         $ 0     $ 3         224,337         505     (269,188)    
Beginning balance (in shares) at Dec. 31, 2019 0     191,139,933 (191,139,933)                                      
Beginning balance at Dec. 31, 2019 $ 0     $ 231,129 $ (231,129)                                      
Ending balance (in shares) at Jun. 30, 2020 0                                              
Ending balance at Jun. 30, 2020 $ 0                                              
Beginning balance (in shares) at Dec. 31, 2019           0 2,961 (2,961) 43,189,195     9,392,682 33,796,513                      
Beginning balance at Dec. 31, 2019 (24,532)     $ (255,661) $ 231,129 $ 0 $ 0 $ 0 $ 3     $ 0 $ 3 234,465     3,339 231,126 54 54 0 (259,054) (259,054) 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                
Foreign currency translation adjustment 242                                              
Net loss (36,452)                                              
Ending balance (in shares) at Jun. 30, 2020           0     39,843,946                              
Ending balance at Jun. 30, 2020 $ (62,885)         $ 0     $ 3         224,985         296     (288,169)    
Beginning balance (in shares) at Mar. 31, 2020 0                                              
Beginning balance at Mar. 31, 2020 $ 0                                              
Ending balance (in shares) at Jun. 30, 2020 0                                              
Ending balance at Jun. 30, 2020 $ 0                                              
Beginning balance (in shares) at Mar. 31, 2020           0     39,756,004                              
Beginning balance at Mar. 31, 2020 (44,343)         $ 0     $ 3         224,337         505     (269,188)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                
Stock option and stock warrant exercises 168                         168                    
Issuance of common stock upon exercise of stock options and warrants (in shares)                 87,942                              
Issuance of common stock upon exercise of stock options and warrants 4                         4                    
Stock-based compensation 476                         476                    
Foreign currency translation adjustment (209)                                   (209)          
Net loss (18,981)                                         (18,981)    
Ending balance (in shares) at Jun. 30, 2020           0     39,843,946                              
Ending balance at Jun. 30, 2020 $ (62,885)         $ 0     $ 3         224,985         296     (288,169)    
Beginning balance (in shares) at Dec. 31, 2020 0     175,437,783 (175,437,783)                                      
Beginning balance at Dec. 31, 2020 $ 0     $ 220,563 $ (220,563)                                      
Ending balance (in shares) at Mar. 31, 2021 0                                              
Ending balance at Mar. 31, 2021 $ 0                                              
Beginning balance (in shares) at Dec. 31, 2020           0 2,961 (2,961) 40,202,785     11,228,371 28,974,414                      
Beginning balance at Dec. 31, 2020 (177,409)     $ (397,972) $ 220,563 $ 0 $ 0 $ 0 $ 4     $ 0 $ 4 230,620     10,061 220,559 (192) (192) 0 (407,841) (407,841) 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                
Issuance of beneficial conversion feature related to convertible notes (Note 7) 1,126                         1,126                    
Stock option and stock warrant exercises (in shares)                 1,412,025                              
Stock option and stock warrant exercises 3,147                         3,147                    
Stock-based compensation 784                         784                    
Foreign currency translation adjustment 251                                   251          
Net loss (82,553)                                         (82,553)    
Ending balance (in shares) at Mar. 31, 2021           0     41,614,810                              
Ending balance at Mar. 31, 2021 $ (254,654)         $ 0     $ 4         235,677         59     (490,394)    
Beginning balance (in shares) at Dec. 31, 2020 0     175,437,783 (175,437,783)                                      
Beginning balance at Dec. 31, 2020 $ 0     $ 220,563 $ (220,563)                                      
Ending balance (in shares) at Jun. 30, 2021 0                                              
Ending balance at Jun. 30, 2021 $ 0                                              
Beginning balance (in shares) at Dec. 31, 2020           0 2,961 (2,961) 40,202,785     11,228,371 28,974,414                      
Beginning balance at Dec. 31, 2020 (177,409)     $ (397,972) $ 220,563 $ 0 $ 0 $ 0 $ 4     $ 0 $ 4 230,620     $ 10,061 $ 220,559 (192) $ (192) $ 0 (407,841) $ (407,841) $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                
Foreign currency translation adjustment (351)                                              
Net loss (182,769)                                              
Ending balance (in shares) at Jun. 30, 2021           0     130,768,055                              
Ending balance at Jun. 30, 2021 $ 208,778         $ 0     $ 13         799,918         (543)     (590,610)    
Beginning balance (in shares) at Mar. 31, 2021 0                                              
Beginning balance at Mar. 31, 2021 $ 0                                              
Ending balance (in shares) at Jun. 30, 2021 0                                              
Ending balance at Jun. 30, 2021 $ 0                                              
Beginning balance (in shares) at Mar. 31, 2021           0     41,614,810                              
Beginning balance at Mar. 31, 2021 (254,654)         $ 0     $ 4         235,677         59     (490,394)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                
Merger and PIPE financing (in shares)                 70,428,326                              
Merger and PIPE financing (Note 1) 247,018               $ 7         247,011                    
Conversion of securities into common stock upon Merger (in shares)                   10,921,548 2,759,970                          
Conversion of securities into common stock upon Merger   $ 77,748 $ 60,568             $ 1         $ 77,747 $ 60,568                
Exchange of warrants into common stock (in shares)                 4,683,349                              
Exchange of warrants into common stock (Note 8) 168,647               $ 1         168,646                    
Issuance of common stock warrants for services (Note 8) 9,183                         9,183                    
Stock option and stock warrant exercises (in shares)                 360,052                              
Stock option and stock warrant exercises 39                         39                    
Stock-based compensation 1,047                         1,047                    
Foreign currency translation adjustment (602)                                   (602)          
Net loss (100,216)                                         (100,216)    
Ending balance (in shares) at Jun. 30, 2021           0     130,768,055                              
Ending balance at Jun. 30, 2021 $ 208,778         $ 0     $ 13         $ 799,918         $ (543)     $ (590,610)