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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 |  |

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