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Convertible Notes Payable - Narratives (Details)
4 Months Ended 7 Months Ended 12 Months Ended
Nov. 16, 2020
USD ($)
$ / shares
shares
May 31, 2019
USD ($)
$ / shares
May 31, 2019
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
grant
shares
Dec. 31, 2019
USD ($)
$ / shares
Nov. 15, 2020
USD ($)
Aug. 01, 2019
Jun. 01, 2019
Debt Instrument [Line Items]                  
Aggregate cash proceeds         $ 9,009,000 $ 19,346,000      
Loss on extinguishment of convertible notes         0 (6,111,000)      
Embedded derivative assets, initial fair value       $ 181,000 411,000 181,000      
Embedded derivative liability, initial fair value       1,145,000   1,145,000      
Embedded derivative liability       $ 1,681,000 0 1,681,000      
Change in fair value, embedded derivative         2,092,000 (716,000)      
Interest expense of convertible notes recognized         23,706,000 $ 49,708,000      
Conversion of convertible notes payable (in shares) | shares 10,886,300,000                
Conversion of convertible notes payable $ 108,900,000       $ 108,863,000        
Conversion price (in usd per share) | $ / shares $ 10                
Common Stock                  
Debt Instrument [Line Items]                  
Conversion of convertible notes payable (in shares) | shares [1]         10,886,336        
Conversion of convertible notes payable [1]         $ 1,000        
2019 Bridge Preferred Units                  
Debt Instrument [Line Items]                  
Issuance price of EES Preferred Units to the Holders (in usd per share) | $ / shares           $ 0.50      
AltEnergy | Investor                  
Debt Instrument [Line Items]                  
Ownership percentage by AltEnergy       20.00% 14.00% 20.00%      
Convertible Debt                  
Debt Instrument [Line Items]                  
Aggregate principal amount       $ 19,524,000 $ 5,469,000 $ 19,524,000      
Number of phases | grant         2        
Aggregate cash proceeds         $ 10,768,000        
Discount, fair value of preferred units             $ 3,790,000    
Convertible Debt | 2019 Phase I Notes                  
Debt Instrument [Line Items]                  
Aggregate principal amount   $ 13,529,000 $ 13,529,000            
Conversion ratio     1.15            
Conversion price per unit (in usd per share) | $ / shares   $ 1.75 $ 1.75            
Liquidation ratio   1.5 1.5 3.0   3.0   3.0 2.0
Optional prepayment ratio   3.0 3.0            
Aggregate gross equity proceeds threshold   $ 25,000,000 $ 25,000,000            
Percentage of holders for repayment to become due on demand   25.00%              
Loss on extinguishment of convertible notes       $ 0          
Redemption percentage   100.00%              
Discount, fair value of preferred units       0   $ 0      
Annual effective interest rates in excess   400.00% 400.00%            
Convertible Debt | 2019 Phase II Notes                  
Debt Instrument [Line Items]                  
Aggregate principal amount       $ 5,995,000   $ 5,995,000      
Conversion ratio       1.15          
Conversion price per unit (in usd per share) | $ / shares       $ 0.50   $ 0.50      
Liquidation ratio       6.0   6.0      
Aggregate cash proceeds           $ 11,991,000      
Percentage of holders for repayment to become due on demand       25.00%          
Redemption percentage       200.00%          
Discount, fair value of preferred units       $ 2,031,000   $ 2,031,000      
Annual effective interest rates in excess       1200.00%   1200.00%      
Convertible Debt | 2020 Phase II Notes                  
Debt Instrument [Line Items]                  
Liquidation ratio       6.0   6.0      
Aggregate cash proceeds         10,598,000        
Discount, fair value of preferred units         1,759,000   1,759,000    
Convertible Debt | 2020 Phase I Notes                  
Debt Instrument [Line Items]                  
Aggregate cash proceeds         $ 170,000        
Discount, fair value of preferred units             0    
Convertible Debt | 2019 Convertible Notes                  
Debt Instrument [Line Items]                  
Discount, fair value of preferred units       $ 2,031,000   $ 2,031,000      
Debt instruments, coupon rate       0.00%   0.00%      
Convertible Debt | AltEnergy | 2019 Convertible Notes                  
Debt Instrument [Line Items]                  
Aggregate principal amount       $ 24,415,000   $ 24,415,000      
Convertible Debt | AltEnergy | Investor | 2019 Phase I Notes                  
Debt Instrument [Line Items]                  
Aggregate principal amount   $ 4,137,000 $ 4,137,000            
Convertible Debt | AltEnergy | Investor | 2019 Phase II Notes                  
Debt Instrument [Line Items]                  
Aggregate principal amount       $ 2,017,000   $ 2,017,000      
Convertible Debt | AltEnergy | Investor | 2020 Phase II Notes                  
Debt Instrument [Line Items]                  
Aggregate principal amount             $ 1,075,000    
[1] See Note 1 for discussion of reverse capitalization given effect herein