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CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Operating expenses        
General and administrative expenses $ 2,692,000 $ 3,004,000 $ 14,705,000 $ 12,425,000
Total operating expenses 9,766,000 10,796,000 45,475,000 44,590,000
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]        
Operating expenses        
General and administrative expenses $ 521,271   $ 3,136,965 $ 9,566
General and administrative expenses - related party 30,000   163,210  
Franchise tax expense 49,415 $ 1,100 200,000 840
Total operating expenses 600,686 1,100 3,500,175 10,406
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] | 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 38,358,504   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 $ 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