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Commitments and Contingencies - Administrative Services Agreement and Underwriting Agreement (Details) - Star Peak Energy Transition Corp [Member] - USD ($)
Aug. 26, 2020
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Commitments And Contingencies [Line Items]        
Underwriting discount per unit $ 0.20      
Cash underwriting fees $ 7,000,000.0      
Deferred fee per unit $ 0.35      
Deferred underwriting commissions $ 12,300,000 $ 13,425,476 $ 13,425,476 $ 13,425,476
Over-allotment        
Commitments And Contingencies [Line Items]        
Cash underwriting fees 700,000      
Deferred underwriting commissions $ 1,200,000