Annual report pursuant to Section 13 and 15(d)

STOCKHOLDERS' EQUITY - Warrants (Details)

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STOCKHOLDERS' EQUITY - Warrants (Details)
 12 Months Ended
Feb. 24, 2020
$ / shares
shares
Dec. 31, 2020
USD ($)
D
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 09, 2020
$ / shares
Aug. 31, 2020
USD ($)
$ / shares
May 31, 2017
$ / shares
shares
Class of Warrant or Right [Line Items]            
Warrants to purchase shares | shares           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  
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        
Trine Warrants            
Class of Warrant or Right [Line Items]            
Exercise price $ 11.50 11.50        
Warrant redemption price   0.01        
Share Price   $ 10.00        
Warrant exercisable term   30 days        
Warrants and Rights Outstanding, Term   5 years        
Debt Instrument, Convertible, Threshold Trading Days | D   20        
Debt Instrument, Convertible, Threshold Consecutive Trading Days | D   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        
Common stock par value (in dollars per share)   $ 0.0001        
Trine Warrants | Warrant            
Class of Warrant or Right [Line Items]            
Number of common stock purchased by each warrant | shares   0.5        
Private Placement Warrants            
Class of Warrant or Right [Line Items]            
Warrants to purchase shares | shares   8,503,000        
Exercise price   $ 11.50        
Warrant redemption price   $ 1.00        
Warrants and Rights Outstanding | $   $ 8,503,000        
Share Price   $ 17.20   $ 24.77    
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