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Restatement of Previously Issued Financial Statements - Balance Sheet (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Aug. 26, 2020
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Balance Sheet              
Total assets $ 212,390,000 $ 205,850,000       $ 188,047,000  
Liabilities and stockholders' equity              
Total current liabilities 208,250,000 190,515,000       109,348,000  
Total liabilities 467,044,000 383,259,000       212,579,000  
Convertible preferred stock, $0.00001 par value; 409,351,021 and 321,346,716 shares authorized as of December 31, 2020 and 2019, respectively; 175,437,783 and 191,139,933 shares issued and outstanding as of December 31, 2020 and 2019, respectively; (liquidation preference of $257,947 and $258,041 as of December 31, 2020 and 2019, respectively) 220,955,000 220,563,000       231,129,000 $ 218,931,000
Stockholders' equity              
Series 1 convertible preferred stock, $0.00001 par value; 4,305 shares authorized as of December 31, 2020 and 2019; 2,961 shares issued and outstanding as of December 31, 2020 and 2019 0 0          
Common stock 0 0          
Additional paid-in capital 14,726,000 10,061,000       3,339,000  
Accumulated deficit (490,394,000) (407,841,000)       (259,054,000)  
Total stockholders' deficit (475,609,000) (397,972,000)     $ (264,867,000) (255,661,000) (210,041,000)
Total liabilities, convertible preferred stock and stockholders' deficit 212,390,000 205,850,000       188,047,000  
Star Peak Energy Transition Corp [Member]              
Balance Sheet              
Total assets 384,598,056 385,286,084 $ 386,179,543     253,018  
Liabilities and stockholders' equity              
Total current liabilities 2,686,624 2,809,435 716,028     246,568  
Deferred legal fees 203,910 203,910 203,910        
Deferred underwriting commissions 13,425,476 13,425,476 13,425,476 $ 12,300,000      
Convertible preferred stock warrant liabilities 276,873,719 121,091,978 11,822,148        
Total liabilities 293,189,729 137,530,799 26,167,562     246,568  
Convertible preferred stock, $0.00001 par value; 409,351,021 and 321,346,716 shares authorized as of December 31, 2020 and 2019, respectively; 175,437,783 and 191,139,933 shares issued and outstanding as of December 31, 2020 and 2019, respectively; (liquidation preference of $257,947 and $258,041 as of December 31, 2020 and 2019, respectively) 86,408,320 242,755,280 355,011,980        
Stockholders' equity              
Series 1 convertible preferred stock, $0.00001 par value; 4,305 shares authorized as of December 31, 2020 and 2019; 2,961 shares issued and outstanding as of December 31, 2020 and 2019          
Additional paid-in capital 273,994,882 117,649,486 5,393,908     23,994  
Accumulated deficit (268,998,806) (112,651,848) (395,152)     (18,550)  
Total stockholders' deficit 5,000,007 5,000,005 5,000,001   5,350 6,450 16,856
Total liabilities, convertible preferred stock and stockholders' deficit 384,598,056 385,286,084 386,179,543     253,018  
Star Peak Energy Transition Corp [Member] | As Previously Reported              
Balance Sheet              
Total assets     386,179,543        
Liabilities and stockholders' equity              
Total current liabilities     716,028        
Deferred legal fees     203,910        
Deferred underwriting commissions     13,425,476        
Total liabilities     14,345,414        
Convertible preferred stock, $0.00001 par value; 409,351,021 and 321,346,716 shares authorized as of December 31, 2020 and 2019, respectively; 175,437,783 and 191,139,933 shares issued and outstanding as of December 31, 2020 and 2019, respectively; (liquidation preference of $257,947 and $258,041 as of December 31, 2020 and 2019, respectively)     366,834,120        
Stockholders' equity              
Additional paid-in capital     5,394,034        
Accumulated deficit     (395,152)        
Total stockholders' deficit     5,000,009        
Total liabilities, convertible preferred stock and stockholders' deficit     386,179,543        
Star Peak Energy Transition Corp [Member] | Restatement Adjustment              
Liabilities and stockholders' equity              
Convertible preferred stock warrant liabilities     11,822,148        
Total liabilities     11,822,148        
Convertible preferred stock, $0.00001 par value; 409,351,021 and 321,346,716 shares authorized as of December 31, 2020 and 2019, respectively; 175,437,783 and 191,139,933 shares issued and outstanding as of December 31, 2020 and 2019, respectively; (liquidation preference of $257,947 and $258,041 as of December 31, 2020 and 2019, respectively)     (11,822,140)        
Stockholders' equity              
Additional paid-in capital     (126)        
Total stockholders' deficit     (8)        
Star Peak Energy Transition Corp [Member] | Restatement of warrants as derivative liabilities              
Balance Sheet              
Total assets     386,179,543        
Liabilities and stockholders' equity              
Total current liabilities     716,028        
Deferred legal fees     203,910        
Deferred underwriting commissions     13,425,476        
Convertible preferred stock warrant liabilities     11,822,148        
Total liabilities     26,167,562        
Convertible preferred stock, $0.00001 par value; 409,351,021 and 321,346,716 shares authorized as of December 31, 2020 and 2019, respectively; 175,437,783 and 191,139,933 shares issued and outstanding as of December 31, 2020 and 2019, respectively; (liquidation preference of $257,947 and $258,041 as of December 31, 2020 and 2019, respectively)     355,011,980        
Stockholders' equity              
Additional paid-in capital     5,393,908        
Accumulated deficit     (395,152)        
Total stockholders' deficit     5,000,001        
Total liabilities, convertible preferred stock and stockholders' deficit     386,179,543        
Star Peak Energy Transition Corp [Member] | Restatement of warrants as derivative liabilities | As Previously Reported              
Balance Sheet              
Total assets   385,286,084 386,179,543        
Liabilities and stockholders' equity              
Total current liabilities   2,809,435 716,028        
Deferred legal fees   203,910 203,910        
Deferred underwriting commissions   13,425,476 13,425,476        
Total liabilities   16,438,821 14,345,414        
Convertible preferred stock, $0.00001 par value; 409,351,021 and 321,346,716 shares authorized as of December 31, 2020 and 2019, respectively; 175,437,783 and 191,139,933 shares issued and outstanding as of December 31, 2020 and 2019, respectively; (liquidation preference of $257,947 and $258,041 as of December 31, 2020 and 2019, respectively)   363,847,260 366,834,120        
Stockholders' equity              
Additional paid-in capital   8,380,865 5,394,034        
Accumulated deficit   (3,382,018) (395,152)        
Total stockholders' deficit   5,000,003 5,000,009        
Total liabilities, convertible preferred stock and stockholders' deficit   385,286,084 386,179,543        
Star Peak Energy Transition Corp [Member] | Restatement of warrants as derivative liabilities | Restatement Adjustment              
Liabilities and stockholders' equity              
Convertible preferred stock warrant liabilities   121,091,978 11,822,148        
Total liabilities   121,091,978 11,822,148        
Convertible preferred stock, $0.00001 par value; 409,351,021 and 321,346,716 shares authorized as of December 31, 2020 and 2019, respectively; 175,437,783 and 191,139,933 shares issued and outstanding as of December 31, 2020 and 2019, respectively; (liquidation preference of $257,947 and $258,041 as of December 31, 2020 and 2019, respectively)   (121,091,980) (11,822,140)        
Stockholders' equity              
Additional paid-in capital   109,268,621 (126)        
Accumulated deficit   (109,269,830)          
Total stockholders' deficit   2 (8)        
Star Peak Energy Transition Corp [Member] | Class A common stock              
Stockholders' equity              
Common stock   1,408          
Star Peak Energy Transition Corp [Member] | Class A common stock | Restatement of warrants as derivative liabilities              
Stockholders' equity              
Common stock     286        
Star Peak Energy Transition Corp [Member] | Class A common stock | Restatement of warrants as derivative liabilities | As Previously Reported              
Stockholders' equity              
Common stock   197 168        
Star Peak Energy Transition Corp [Member] | Class A common stock | Restatement of warrants as derivative liabilities | Restatement Adjustment              
Stockholders' equity              
Common stock   1,211 118        
Star Peak Energy Transition Corp [Member] | Common Class B              
Stockholders' equity              
Common stock 959 959 959     1,006  
Total stockholders' deficit $ 959 959     $ 1,006 $ 1,006 $ 1,006
Star Peak Energy Transition Corp [Member] | Common Class B | As Previously Reported              
Stockholders' equity              
Common stock     959        
Star Peak Energy Transition Corp [Member] | Common Class B | Restatement of warrants as derivative liabilities              
Stockholders' equity              
Common stock     959        
Star Peak Energy Transition Corp [Member] | Common Class B | Restatement of warrants as derivative liabilities | As Previously Reported              
Stockholders' equity              
Common stock   $ 959 $ 959