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Restatement of Previously Issued Financial Statements - Statement of Operations (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Statement of Operations        
Loss from operations $ (9,883,000) $ (12,198,000) $ (49,387,000) $ (47,850,000)
Other (expense) income:        
Change in fair value of warrant liabilities 66,397,000 (1,009,000) 84,455,000 (1,493,000)
Total other income (expense) (72,670,000) (5,273,000) (106,732,000) (11,558,000)
Net loss $ (82,553,000) $ (17,471,000) $ (156,124,000) $ (59,414,000)
Weighted-average number of shares outstanding used to compute net loss per share attributable to common stockholders, basic and diluted 12,263,160 9,075,646 9,474,749 10,703,380
Net loss per share attributable to common stockholders, basic and diluted $ (6.73) $ (2.97) $ (17.48) $ (6.05)
Star Peak Energy Transition Corp [Member]        
Statement of Operations        
Loss from operations     $ (3,500,175)  
Other (expense) income:        
Change in fair value of warrant liabilities $ 155,781,741 $ 0 (109,269,830)  
Net gain from Investments held in Trust Account 35,469   136,707  
Total other income (expense) (155,746,272)   (109,133,123)  
Net loss $ (156,346,958) (1,100) (112,633,298) $ (10,406)
Star Peak Energy Transition Corp [Member] | Restatement of warrants as derivative liabilities | As Previously Reported        
Statement of Operations        
Loss from operations     (3,500,175)  
Other (expense) income:        
Net gain from Investments held in Trust Account     136,707  
Total other income (expense)     136,707  
Net loss     (3,363,468)  
Star Peak Energy Transition Corp [Member] | Restatement of warrants as derivative liabilities | Restatement Adjustment        
Other (expense) income:        
Change in fair value of warrant liabilities     (109,269,830)  
Total other income (expense)     (109,269,830)  
Net loss     $ (109,269,830)  
Star Peak Energy Transition Corp [Member] | Class A common stock        
Other (expense) income:        
Weighted-average number of shares outstanding used to compute net loss per share attributable to common stockholders, basic and diluted 38,358,504   38,208,123  
Star Peak Energy Transition Corp [Member] | Class A common stock | Restatement of warrants as derivative liabilities | As Previously Reported        
Other (expense) income:        
Weighted-average number of shares outstanding used to compute net loss per share attributable to common stockholders, basic and diluted     38,208,123  
Star Peak Energy Transition Corp [Member] | Common Class B        
Other (expense) income:        
Change in fair value of warrant liabilities     $ 109,300,000  
Net loss $ 156,300,000 $ 0 $ 112,600,000  
Weighted-average number of shares outstanding used to compute net loss per share attributable to common stockholders, basic and diluted 9,589,626 8,750,000 9,589,626 9,589,626
Net loss per share attributable to common stockholders, basic and diluted $ (16.30) $ 0.00 $ (11.75) $ 0.00
Star Peak Energy Transition Corp [Member] | Common Class B | Restatement of warrants as derivative liabilities | As Previously Reported        
Other (expense) income:        
Weighted-average number of shares outstanding used to compute net loss per share attributable to common stockholders, basic and diluted     9,589,626  
Net loss per share attributable to common stockholders, basic and diluted     $ (0.35)