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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
Deferred tax asset     $ 93,011,000 $ 74,955,000  
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)  
General and administrative expenses 2,692,000 3,004,000 14,705,000 12,425,000  
Change in fair value of warrant liabilities 66,397,000 (1,009,000) $ 84,455,000 (1,493,000)  
Star Peak Energy Transition Corp [Member]          
Class of Stock [Line Items]          
Temporary Equity, Shares Outstanding     24,275,528    
Cash equivalents     $ 0 0  
Deferred tax asset     706,328 2,185  
Investment Income, Net 35,469   136,707    
Net loss (156,346,958) (1,100) (112,633,298) (10,406)  
General and administrative expenses 521,271   3,136,965 9,566  
Change in fair value of warrant liabilities 155,781,741 0 (109,269,830)    
Franchise tax expense $ 49,415 1,100 $ 200,000 $ 840  
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Taxes available to be withdrawn from the Trust Account     $ 137,000    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    
General and administrative expenses     3,300,000    
Change in fair value of warrant liabilities     109,300,000    
Franchise tax expense     $ 63,000    
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