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Class A Ordinary Shares Subject to Possible Redemption (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Temporary Equity [Line Items]          
Temporary equity, shares outstanding 6,000,000 6,000,000 6,000,000 6,000,000 6,000,000
Class A ordinary shares subject to possible redemption $ 2,140,000 $ 2,140,000   $ 2,140,000  
SPRING VALLEY ACQUISITION CORP          
Temporary Equity [Line Items]          
Class A ordinary shares subject to possible redemption $ 232,300,000 $ 232,300,000   $ 232,300,000  
SPRING VALLEY ACQUISITION CORP | Class A Common Stock          
Temporary Equity [Line Items]          
Temporary equity, par value $ 0.0001 $ 0.0001      
Temporary equity, shares outstanding 23,000,000 23,000,000      
SPRING VALLEY ACQUISITION CORP | Class A Ordinary Shares Subject to Redemption          
Temporary Equity [Line Items]          
Temporary equity, shares authorized 300,000,000     300,000,000  
Temporary equity, par value $ 0.0001     $ 0.0001  
Temporary equity, shares outstanding 23,000,000     23,000,000  
Gross proceeds from Initial Public Offering $ 230,000,000        
Fair value of Public Warrants at issuance (12,650,000)        
Offering costs allocated to Class A ordinary shares subject to possible redemption (11,743,101)        
Accretion on Class A ordinary shares subject to possible redemption amount 26,693,101        
Class A ordinary shares subject to possible redemption $ 232,300,000