Registration of securities issued in business combination transactions

STOCKHOLDERS' EQUITY - Common Stock Warrants (Details)

v3.21.2
STOCKHOLDERS' EQUITY - Common Stock Warrants (Details)
 6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
Y
shares
Dec. 31, 2020
USD ($)
Y
$ / shares
shares
Dec. 09, 2020
$ / shares
Jun. 30, 2020
Y
Dec. 31, 2019
Y
$ / shares
Class of Warrant or Right [Line Items]          
Change in fair value of warrant liability | $ $ 56,576,000 $ (56,417,000)      
Common Stock Warrants Converted 756,498        
Shares issued on exercise of warrants 447,938        
Risk-free interest rate          
Class of Warrant or Right [Line Items]          
Warrants and Rights Outstanding, Measurement Input       0.020  
Expected volatility          
Class of Warrant or Right [Line Items]          
Warrants and Rights Outstanding, Measurement Input       0.525  
Expected life (in years)          
Class of Warrant or Right [Line Items]          
Warrants and Rights Outstanding, Measurement Input | Y       0.078  
Minimum          
Class of Warrant or Right [Line Items]          
Share price | $ / shares   $ 5.13      
Collaboration Agreement          
Class of Warrant or Right [Line Items]          
Share price | $ / shares   $ 3.34     $ 3.34
Common Stock Warrants Converted   756,498      
Shares issued on exercise of warrants   447,938      
Collaboration Agreement | Risk-free interest rate          
Class of Warrant or Right [Line Items]          
Warrants and Rights Outstanding, Measurement Input   2.0     2.0
Collaboration Agreement | Expected volatility          
Class of Warrant or Right [Line Items]          
Warrants and Rights Outstanding, Measurement Input   52.5     52.5
Collaboration Agreement | Expected life (in years)          
Class of Warrant or Right [Line Items]          
Warrants and Rights Outstanding, Measurement Input | Y   8.0      
Collaboration Agreement | Maximum          
Class of Warrant or Right [Line Items]          
Warrants and Rights Outstanding, Measurement Input | Y         8.8
Collaboration Agreement | Minimum | Expected life (in years)          
Class of Warrant or Right [Line Items]          
Warrants and Rights Outstanding, Measurement Input | Y         8.0
Technical Technical Research and Development Advisor Services          
Class of Warrant or Right [Line Items]          
Share price | $ / shares   $ 7.98      
Common Stock Warrants Converted   366,366      
Shares issued on exercise of warrants   244,428      
Technical Technical Research and Development Advisor Services | Risk-free interest rate          
Class of Warrant or Right [Line Items]          
Warrants and Rights Outstanding, Measurement Input   0.5      
Technical Technical Research and Development Advisor Services | Expected volatility          
Class of Warrant or Right [Line Items]          
Warrants and Rights Outstanding, Measurement Input   52.5      
Technical Technical Research and Development Advisor Services | Expected life (in years)          
Class of Warrant or Right [Line Items]          
Warrants and Rights Outstanding, Measurement Input | Y   0.3      
Private Placement Warrants          
Class of Warrant or Right [Line Items]          
Change in fair value of warrant liability | $   $ (56,400,000)      
Private Placement Warrants | Risk-free interest rate          
Class of Warrant or Right [Line Items]          
Warrants and Rights Outstanding, Measurement Input   0.4 0.4    
Private Placement Warrants | Expected volatility          
Class of Warrant or Right [Line Items]          
Warrants and Rights Outstanding, Measurement Input 0.550 50.0 40.0    
Private Placement Warrants | Expected life (in years)          
Class of Warrant or Right [Line Items]          
Warrants and Rights Outstanding, Measurement Input 0.048 4.9 5    
Private Placement Warrants | Expected dividend yield          
Class of Warrant or Right [Line Items]          
Share price | $ / shares   $ 17.20 $ 24.77    
Private Placement Warrants | Maximum | Risk-free interest rate          
Class of Warrant or Right [Line Items]          
Warrants and Rights Outstanding, Measurement Input 0.006        
Private Placement Warrants | Minimum | Risk-free interest rate          
Class of Warrant or Right [Line Items]          
Warrants and Rights Outstanding, Measurement Input 0.004