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Related Party Transactions - Founder Shares (Details) - USD ($)
 3 Months Ended 12 Months Ended
Nov. 08, 2020
Aug. 26, 2020
Jul. 29, 2020
Jul. 13, 2020
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Nov. 08, 2018
Related Party Transaction [Line Items]                
Common shares, shares outstanding (in shares)         17,694,228 11,228,371    
Common stock, shares issued         17,694,228 11,228,371 9,392,682  
Star Peak Energy Transition Corp [Member]                
Related Party Transaction [Line Items]                
Aggregate purchase price           $ 376,932,978    
Star Peak Energy Transition Corp [Member] | Private Placement                
Related Party Transaction [Line Items]                
Aggregate purchase price         $ 1.50 $ 1.50    
Number of shares transferred (in shares)         6,733,333 6,733,333    
Star Peak Energy Transition Corp [Member] | Founder Shares                
Related Party Transaction [Line Items]                
Number of shares subject to forfeiture (in shares)   472,874 1,312,500          
Percentage of issued and outstanding shares after the Initial Public Offering collectively held by initial stockholders     20.00%          
Star Peak Energy Transition Corp [Member] | Sponsor                
Related Party Transaction [Line Items]                
Number of shares transferred (in shares)       10,062,500        
Star Peak Energy Transition Corp [Member] | Sponsor | Private Placement                
Related Party Transaction [Line Items]                
Number of shares with respect to which stock dividend is effected   447,801            
Star Peak Energy Transition Corp [Member] | Sponsor | Founder Shares                
Related Party Transaction [Line Items]                
Aggregate purchase price         $ 25,000 $ 25,000    
Number of shares transferred (in shares)     40,000          
Star Peak Energy Transition Corp [Member] | Class A shares                
Related Party Transaction [Line Items]                
Common shares, shares outstanding (in shares)         29,717,672 14,082,976    
Percentage of issued and outstanding shares after the Initial Public Offering collectively held by initial stockholders         20.00% 20.00%    
Stock price trigger to transfer, assign or sell any shares or warrants of the company, after the completion of the initial business combination (in dollars per share)         $ 11.50 $ 11.50    
Common stock, shares issued         29,717,672 14,082,976    
Star Peak Energy Transition Corp [Member] | Class A shares | Founder Shares                
Related Party Transaction [Line Items]                
Stock price trigger to transfer, assign or sell any shares or warrants of the company, after the completion of the initial business combination (in dollars per share)         $ 12.00 $ 12.00    
Star Peak Energy Transition Corp [Member] | Class A shares | Sponsor | Founder Shares                
Related Party Transaction [Line Items]                
Threshold period for not to transfer, assign or sell any of their shares or warrants after the completion of the initial business combination           1 year    
Threshold trading days for transfer, assign or sale of shares or warrants, after the completion of the initial business combination           20 days    
Threshold consecutive trading days for transfer, assign or sale of shares or warrants, after the completion of the initial business combination           30 days    
Threshold period after the business combination in which the 20 trading days within any 30 trading day period commences           150 days    
Transfer, Assign Or Sell Any Shares Or Warrants After Completion Of Initial Business Combination, Threshold Trading Days           20 days    
Star Peak Energy Transition Corp [Member] | Common Class B                
Related Party Transaction [Line Items]                
Common shares, shares outstanding (in shares)       10,062,500 9,589,626 9,589,626 10,062,500  
Percentage of issued and outstanding shares after the Initial Public Offering collectively held by initial stockholders       20.00%        
Class B common stock forfeited (in shares)           472,874    
Common stock, shares issued         9,589,626 9,589,626 10,062,500 2,875,000
Star Peak Energy Transition Corp [Member] | Common Class B | Over-allotment                
Related Party Transaction [Line Items]                
Class B common stock forfeited (in shares)   472,874            
Star Peak Energy Transition Corp [Member] | Common Class B | Sponsor | Founder Shares                
Related Party Transaction [Line Items]                
Number of shares issued 2,875,000              
Aggregate purchase price $ 25,000              
Threshold period for not to transfer, assign or sell any of their shares or warrants after the completion of the initial business combination         1 year      
Stock price trigger to transfer, assign or sell any shares or warrants of the company, after the completion of the initial business combination (in dollars per share) $ 0.0001              
Threshold trading days for transfer, assign or sale of shares or warrants, after the completion of the initial business combination         20 days      
Threshold consecutive trading days for transfer, assign or sale of shares or warrants, after the completion of the initial business combination         30 days 30 days    
Threshold period after the business combination in which the 20 trading days within any 30 trading day period commences         150 days      
Transfer, Assign Or Sell Any Shares Or Warrants After Completion Of Initial Business Combination, Threshold Trading Days         20 days