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Derivative Warrant Liabilities (Details) - SPRING VALLEY ACQUISITION CORP - $ / shares
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Class of Warrant or Right [Line Items]      
Minimum threshold written notice period for redemption of public warrants 30 days    
Public Warrants exercisable term from the closing of the initial public offering 1 year    
Public Warrants expiration term 5 years    
Threshold period for filling registration statement after business combination 20 days    
Maximum threshold period for registration statement to become effective after business combination 60 days    
Redemption price per public warrant (in dollars per share) $ 0.01    
Threshold trading days for redemption of public warrants 20 days    
Threshold consecutive trading days for redemption of public warrants 30 days    
Percentage of gross proceeds on total equity proceeds 60.00%    
Adjustment of exercise price of warrants based on market value and newly issued price (as a percent) 115.00%    
Adjustment one of redemption price of stock based on market value and newly issued price (as a percent) 180.00%    
Private Placement Warrant      
Class of Warrant or Right [Line Items]      
Number of warrants outstanding 8,900,000 8,900,000 8,900,000
Public Warrants      
Class of Warrant or Right [Line Items]      
Number of warrants outstanding 11,500,000 11,500,000 11,500,000
Public Warrants expiration term   5 years  
Public Warrants | Redemption of Warrants When the Price per Class A Ordinary Share Equals or Exceeds $18.00      
Class of Warrant or Right [Line Items]      
Minimum threshold written notice period for redemption of public warrants   30 days  
Stock price trigger for redemption of public warrants (in dollars per share) $ 18.00    
Redemption price per public warrant (in dollars per share)   $ 0.01  
Threshold trading days for redemption of public warrants 20 days 20 days  
Threshold consecutive trading days for redemption of public warrants   30 days  
Threshold number of business days before sending notice of redemption to warrant holders 3 days 3 days  
Public Warrants | Redemption of Warrants When the Price per Class A Ordinary Share Equals or Exceeds $10.00      
Class of Warrant or Right [Line Items]      
Minimum threshold written notice period for redemption of public warrants   30 days  
Stock price trigger for redemption of public warrants (in dollars per share) $ 10.00    
Redemption price per public warrant (in dollars per share)   $ 0.10  
Threshold trading days for redemption of public warrants 20 days 20 days  
Threshold consecutive trading days for redemption of public warrants   30 days  
Threshold number of business days before sending notice of redemption to warrant holders 3 days 3 days  
Class A Common Stock | Public Warrants      
Class of Warrant or Right [Line Items]      
Redemption price per public warrant (in dollars per share) $ 0.10    
Class A Common Stock | Maximum      
Class of Warrant or Right [Line Items]      
Share price $ 9.20