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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
 3 Months Ended 4 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Loss from operations $ (43,848,000) $ (36,459,000)   $ (174,300,000) $ (158,843,000)
Other income (expenses):          
Net income (loss) (23,373,000) (22,666,000)   (102,493,000) $ (88,387,000)
SPRING VALLEY ACQUISITION CORP          
General and administrative expenses 5,147,286 299,060 $ 114,144 1,327,217  
Loss from operations (5,147,286) (299,060) (114,144) (1,327,217)  
Other income (expenses):          
Change in fair value of derivative warrant liabilities (10,835,000) 9,028,000 (12,110,000) 4,511,000  
Offering costs allocated to derivative warrant liabilities     (749,253)    
Income from investments held in Trust Account 23,395 5,729 1,973 18,965  
Net income (loss) $ (15,958,891) $ 8,734,669 $ (12,971,424) $ 3,202,748  
Class A Common Stock | SPRING VALLEY ACQUISITION CORP          
Other income (expenses):          
Weighted average shares outstanding, ordinary shares, Basic 23,000,000 23,000,000 6,052,632 23,000,000  
Weighted average shares outstanding, ordinary shares, Diluted 23,000,000 23,000,000 6,052,632 23,000,000  
Basic net income (loss) per share $ (0.56) $ 0.30 $ (1.15) $ 0.11  
Diluted net income (loss) per share $ (0.56) $ 0.30 $ (1.15) $ 0.11  
Class B ordinary share | SPRING VALLEY ACQUISITION CORP          
Other income (expenses):          
Weighted average shares outstanding, ordinary shares, Basic 5,750,000 5,750,000 5,197,368 5,750,000  
Weighted average shares outstanding, ordinary shares, Diluted 5,750,000 5,750,000 5,197,368 5,750,000  
Basic net income (loss) per share $ (0.56) $ 0.30 $ (1.15) $ 0.11  
Diluted net income (loss) per share $ (0.56) $ 0.30 $ (1.15) $ 0.11