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Basic of Presentation and Summary of Significant Accounting Policies - Class A Common Stock Subject to Possible Redemption (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Class of Stock [Line Items]          
Temporary Equity, Shares Outstanding 175,528,225   175,437,783 191,139,933 186,466,181
Shares excluded since their inclusion would be anti-dilutive 321,086,776 297,188,387 325,849,346 293,772,949  
Net loss $ (82,553,000) $ (17,471,000) $ (156,124,000) $ (59,414,000)  
Star Peak Energy Transition Corp [Member]          
Class of Stock [Line Items]          
Temporary Equity, Shares Outstanding     24,275,528    
Investment Income, Net 35,469   $ 136,707    
Net loss $ (156,346,958) (1,100) $ (112,633,298) $ (10,406)  
Star Peak Energy Transition Corp [Member] | Class A common stock          
Class of Stock [Line Items]          
Temporary Equity, Shares Outstanding 8,640,832   24,275,528    
Taxes available to be withdrawn from the Trust Account     $ 137,000    
Star Peak Energy Transition Corp [Member] | Common Class B          
Class of Stock [Line Items]          
Net loss $ 156,300,000 $ 0 $ 112,600,000    
Star Peak Energy Transition Corp [Member] | Class A shares          
Class of Stock [Line Items]          
Temporary Equity, Shares Outstanding 8,640,832   24,275,528    
Investment Income, Net $ 35,000   $ 137,000    
Taxes available to be withdrawn from the Trust Account 35,000        
Net loss $ 0        
Star Peak Energy Transition Corp [Member] | Class A shares          
Class of Stock [Line Items]          
Shares excluded since their inclusion would be anti-dilutive 19,967,302   19,967,302    
Star Peak Energy Transition Corp [Member] | Founder Shares | Sponsor          
Class of Stock [Line Items]          
Federal depository insurance coverage $ 250,000   $ 250,000