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Fair Value Measurements - Level 3 fair value measurements (Details) - SPRING VALLEY ACQUISITION CORP | Dec. 31, 2021 | Dec. 31, 2021 USD ($) | Dec. 31, 2020
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Volatility |  |  |
Derivative Liability, Measurement Input | 20.60 |  |
Level 3 | Exercise price |  |  |
Derivative Liability, Measurement Input | 11.50 | 11.50 | 11.50
Level 3 | IPO Price |  |  |
Derivative Liability, Measurement Input | 10.00 | 10.00 | 10.00
Level 3 | Implied Stock Price Range |  |  |
Derivative Liability, Measurement Input | 10.03 | 10.03 | 10.12
Level 3 | Volatility |  |  |
Derivative Liability, Measurement Input | 26.60 |  | 21.0
Level 3 | Term |  |  |
Derivative Liability, Measurement Input | 5.50 |  | 5.70
Level 3 | Risk-free rate |  |  |
Derivative Liability, Measurement Input | 1.30 |  | 0.46
Level 3 | Dividend Yield |  |  |
Derivative Liability, Measurement Input | 0.0 |  | 0.0

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