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CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
OPERATING ACTIVITIES        
Net loss     $ (156,124,000) $ (59,414,000)
Adjustments to reconcile net loss to net cash used in operating activities        
Change in fair value of warrant liabilities $ 66,397,000 $ (1,009,000) 84,455,000 (1,493,000)
Changes in operating assets and liabilities        
Net cash used in operating activities (1,827,000) (10,670,000) (33,671,000) (29,678,000)
Net decrease in cash and cash equivalents 2,931,000 (2,009,000) (5,947,000) (9,005,000)
Cash and cash equivalents, beginning of year 6,942,000 12,889,000 12,889,000 21,894,000
Cash and cash equivalents, end of year of year 9,873,000 10,880,000 6,942,000 12,889,000
Star Peak Energy Transition Corp [Member]        
OPERATING ACTIVITIES        
Net loss (156,346,958) (1,100) (112,633,298) (10,406)
Adjustments to reconcile net loss to net cash used in operating activities        
Change in fair value of warrant liabilities 155,781,741 0 (109,269,830)  
Unrealized gain from Investments held in Trust Account (35,469) 0 (136,707)  
Changes in operating assets and liabilities        
Prepaid expenses 41,305 0 (625,970) (1,594)
Franchise tax payable 22,392 1,100 198,406 (4,695)
Accounts payable (122,813) 0 (281,128) (778)
Accrued expenses 149,093 0 2,370,390  
Net cash used in operating activities (510,709) 0 (1,838,477) (17,473)
Net decrease in cash and cash equivalents (510,709) 0 936,773 (159,672)
Cash and cash equivalents, beginning of year 936,773 0 0 159,672
Cash and cash equivalents, end of year of year 426,064 0 936,773 $ 0
Supplemental disclosure of noncash activities:        
Change in value of Class A common stock subject to possible redemption $ (156,346,960) $ 0 $ (92,197,620)