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Initial Public Offering (Details) - Star Peak Energy Transition Corp [Member] - USD ($)
 3 Months Ended 12 Months Ended
Aug. 26, 2020
Aug. 20, 2020
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Subsidiary, Sale of Stock [Line Items]          
Price per share       $ 10.00  
Deferred underwriting commissions in connection with the initial public offering $ 12,300,000   $ 13,425,476 $ 13,425,476 $ 13,425,476
Initial Public Offering          
Subsidiary, Sale of Stock [Line Items]          
Number of units issued 3,358,504 35,000,000      
Price per share $ 10.00 $ 10.00 $ 10.00    
Gross proceeds from sale of units   $ 350,000,000.0      
Offering costs   20,000,000.0      
Deferred underwriting commissions in connection with the initial public offering   $ 12,300,000      
Number of shares in a unit     1 1  
Number of warrants in a unit     0.33 0.33  
Number of shares issuable per warrant     1 1  
Exercise price of warrants     $ 11.50 $ 11.50  
Over-allotment          
Subsidiary, Sale of Stock [Line Items]          
Number of units issued 3,358,504   5,250,000 5,250,000  
Price per share $ 10.00   $ 10.00 $ 10.00  
Gross proceeds from sale of units $ 33,600,000        
Offering costs 1,900,000        
Deferred underwriting commissions in connection with the initial public offering $ 1,200,000