Registration of securities issued in business combination transactions

STOCKHOLDERS' EQUITY - Warrants (Details)

v3.21.2
STOCKHOLDERS' EQUITY - Warrants (Details)
 6 Months Ended 12 Months Ended
Feb. 24, 2020
$ / shares
shares
Jun. 30, 2021
USD ($)
D
$ / shares
shares
Dec. 31, 2020
USD ($)
D
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 09, 2020
$ / shares
Aug. 31, 2020
USD ($)
$ / shares
Jun. 30, 2020
shares
May 31, 2017
$ / shares
shares
Class of Warrant or Right [Line Items]                
Warrants to purchase shares | shares   0         99,960 2,442,440
Number of common stock purchased by each warrant | shares               1
Revenue generated per share               $ 35.00
Exercise price           $ 3.34   $ 3.34
Warrants and Rights Outstanding | $     $ 93,328,000          
Fair value of the warrants | $     $ 200,000 $ 1,000,000.0   $ 1,700,000    
Common stock par value (in dollars per share)   $ 0.0001 $ 0.0001 $ 0.0001 $ 0.0001 $ 0.0001    
Warrants issued | shares     122,073 611,969        
Class of Warrant or Right, Outstanding | shares     15,007,494          
Divisional Factor for Conversion of Debt to Warrants $ 1.00              
Common Class A                
Class of Warrant or Right [Line Items]                
Common stock par value (in dollars per share)   0.0001 $ 0.0001          
Trine Warrants                
Class of Warrant or Right [Line Items]                
Exercise price $ 11.50 11.50 11.50          
Warrant redemption price   0.01 0.01          
Share Price   $ 10.00 $ 10.00          
Warrant exercisable term   30 days 30 days          
Warrants and Rights Outstanding, Term   5 years 5 years          
Debt Instrument, Convertible, Threshold Trading Days | D   20 20          
Debt Instrument, Convertible, Threshold Consecutive Trading Days | D   30 30          
Debt Conversion, Converted Instrument, Warrants or Options Issued | shares 1,500,000              
Trine Warrants | Common Class A                
Class of Warrant or Right [Line Items]                
Number of common stock purchased by each warrant | shares   1 1          
Common stock par value (in dollars per share)   $ 0.0001 $ 0.0001          
Trine Warrants | Warrants                
Class of Warrant or Right [Line Items]                
Number of common stock purchased by each warrant | shares   0.5 0.5          
Private Placement Warrants                
Class of Warrant or Right [Line Items]                
Warrants to purchase shares | shares   8,503,000 8,503,000          
Number of common stock purchased by each warrant | shares   1            
Exercise price   $ 11.50 $ 11.50          
Warrant redemption price   $ 1.00 $ 1.00          
Warrants and Rights Outstanding | $   $ 8,503,000 $ 8,503,000          
Fair value of the warrants | $   $ 56,600,000            
Minimum                
Class of Warrant or Right [Line Items]                
Share Price     $ 5.13          
Minimum | Trine Warrants | Common Class A                
Class of Warrant or Right [Line Items]                
Share Price   $ 18.00 $ 18.00