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Fair Value Measurement (Tables) - SPRING VALLEY ACQUISITION CORP | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Schedule of fair value hierarchy for assets and liabilities measured at fair value on a recurring basis | The following table presents information about the Company’s financial assets and liabilities that are measured at fair value on a recurring basis as of March 31, 2022 and December 31, 2021, by level within the fair value hierarchy:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
March 31, 2022 | ​ | ​ | ​ | ​ | Significant | ​ | Significant
​ | ​ | Quoted Prices | ​ | Other | ​ | Other
​ | ​ | Markets | ​ | Observable | ​ | Unobservable
​ | ​ | in Active | ​ | Inputs | ​ | Inputs
Description |  | (Level 1) |  | (Level 2) |  | (Level 3)
Assets: |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investments held in Trust Account - Mutual funds | ​ | $ | 232,344,333 | ​ | $ | — | ​ | $ | —
Liabilities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Derivative warrant liabilities - Public Warrants | ​ | $ | 22,540,000 | ​ | $ | — | ​ | $ | —
Derivative warrant liabilities - Private Warrants | ​ | $ | — | ​ | $ | 17,444,000 | ​ | $ | —
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2021 | ​ | ​ | ​ | ​ | Significant | ​ | Significant
​ | ​ | Quoted Prices | ​ | Other | ​ | Other
​ | ​ | in Active | ​ | Observable | ​ | Unobservable
​ | ​ | Markets | ​ | Inputs | ​ | Inputs
Description |  | (Level 1) |  | (Level 2) |  | (Level 3)
Assets: |  | ​ |  |  | ​ |  |  | ​ |
Investments held in Trust Account - Mutual funds | ​ | $ | 232,320,939 | ​ | $ | — | ​ | $ | —
Liabilities: | ​ |  |  | ​ |  |  | ​ |  |
Derivative warrant liabilities - Public Warrants | ​ | $ | 14,375,000 | ​ | $ | — | ​ | $ | —
Derivative warrant liabilities - Private Warrants | ​ | $ | — | ​ | $ | — | ​ | $ | 14,774,000
​ | The following table presents a summary of the changes in the fair value of the derivative warrant liabilities, measured using Level 3 inputs, measured on a recurring basis. ​
​ | ​ | ​ | ​
For the year ended December 31, 2021 | ​ | ​ | ​
Derivative warrant liabilities at January 1, 2021 |  | $ | 14,685,000
Change in fair value of derivative warrant liabilities |  | ​ | 89,000
Derivative warrant liabilities at December 31, 2021 | ​ | $ | 14,774,000
​
​ | ​ | ​ | ​
For the period from August 20, 2020 (inception) through December 31, 2020 | ​ | ​ | ​
Derivative warrant liabilities at August 20, 2020 (inception) |  | $ | —
Issuance of Public and Private Warrants |  | ​ | 22,529,000
Transfer of Public Warrants to Level 1 |  | ​ | (12,650,000)
Change in fair value of derivative warrant liabilities |  | ​ | 4,806,000
Derivative warrant liabilities at December 31, 2020 | ​ | $ | 14,685,000
Summary of changes in the fair value of the derivative warrant liabilities | The following table presents a summary of the changes in the fair value of the derivative warrant liabilities, measured using Level 3 inputs, measured on a recurring basis.
​ | ​ | ​ | ​
For the three months ended March 31, 2022 |  | ​ | ​
Derivative warrant liabilities at January 1, 2022 | ​ | $ | 14,774,000
Transfer of Private Warrants to Level 2 | ​ | ​ | (14,774,000)
Change in fair value of derivative warrant liabilities | ​ | ​ | —
Derivative warrant liabilities at March 31, 2022 | ​ | $ | —
​
​ | ​ | ​ | ​
For the year ended December 31, 2021 |  |  | ​
Derivative warrant liabilities at January 1, 2021 | ​ | $ | 14,685,000
Change in fair value of derivative warrant liabilities | ​ |  | 89,000
Derivative warrant liabilities at December 31, 2021 | ​ | $ | 14,774,000
Summary of quantitative information regarding Level 3 fair value measurements inputs | ​
​ | ​ | ​ | ​ | ​
​ | ​ | As of | ​
​ |  | December 31, 2021 |
Exercise price | ​ | $ | 11.50 | ​
IPO price | ​ | $ | 10.00 | ​
Implied share price range (or underlying asset price) | ​ | $ | 10.03 | ​
Volatility | ​ |  | 20.60 | %
Term (years) | ​ |  | 5.50 | ​
Risk-free rate | ​ |  | 1.30 | %
Dividend yield | ​ |  | 0.0 | %
Schedule of fair value hierarchy for liabilities measured at fair value on a recurring basis |  | The following table presents information about the Company’s financial assets and liabilities that are measured at fair value on a recurring basis as of December 31, 2021 and 2020, by level within the fair value hierarchy: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2021 | ​ | ​ | ​ | ​ | Significant | ​ | Significant
​ | ​ | Quoted Prices | ​ | Other | ​ | Other
​ | ​ | in Active | ​ | Observable | ​ | Unobservable
​ | ​ | Markets | ​ | Inputs | ​ | Inputs
Description |  | (Level 1) |  | (Level 2) |  | (Level 3)
Assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investments held in Trust Account - Mutual funds | ​ | $ | 232,320,939 | ​ | $ | — | ​ | $ | —
Liabilities: | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
Derivative warrant liabilities - Public Warrants | ​ | $ | 14,375,000 | ​ | $ | — | ​ | $ | —
Derivative warrant liabilities - Private Warrants | ​ | $ | — | ​ | $ | — | ​ | $ | 14,774,000
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2020 | ​ | ​ | ​ | ​ | Significant | ​ | Significant
​ | ​ | Quoted Prices | ​ | Other | ​ | Other
​ | ​ | in Active | ​ | Observable | ​ | Unobservable
​ |  | Markets |  | Inputs |  | Inputs
Description |  | (Level 1) |  | (Level 2) |  | (Level 3)
Assets: |  | ​ |  |  | ​ |  |  | ​ |
Investments held in Trust Account - Mutual funds | ​ | $ | 232,301,973 | ​ | $ | — | ​ | $ | —
Liabilities: | ​ |  |  | ​ |  |  | ​ |  |
Derivative warrant liabilities - Public Warrants | ​ | $ | 18,975,000 | ​ | $ | — | ​ | $ | —
Derivative warrant liabilities - Private Warrants | ​ | $ | — | ​ | $ | — | ​ | $ | 14,685,000

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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19279-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19279-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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