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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Operating expenses    
General and administrative expenses $ 14,705,000 $ 12,425,000
Total operating expenses 45,475,000 44,590,000
Change in fair value of warrant liabilities (84,455,000) 1,493,000
Loss before income taxes (156,119,000) (59,408,000)
Net loss $ (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 9,474,749 10,703,380
Net loss per share attributable to common stockholders, basic and diluted $ (17.48) $ (6.05)
Star Peak Energy Transition Corp [Member]    
Operating expenses    
General and administrative expenses $ 3,136,965 $ 9,566
General and administrative expenses - related party 163,210  
Franchise tax expense 200,000 840
Total operating expenses 3,500,175 10,406
Change in fair value of warrant liabilities 109,269,830  
Net gain from Investments held in Trust Account 136,707  
Loss before income taxes 112,633,298 10,406
Net loss $ (112,633,298) $ (10,406)
Star Peak Energy Transition Corp [Member] | Class A common stock    
Operating expenses    
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    
Operating expenses    
General and administrative expenses $ 3,300,000  
Franchise tax expense 63,000  
Change in fair value of warrant liabilities (109,300,000)  
Net loss $ 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 9,589,626
Net loss per share attributable to common stockholders, basic and diluted $ (11.75) $ 0.00