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Fair Value Measurements (Tables) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Fair Value Measurements (Tables) [Line Items] |  |
Schedule of Liabilities Subject to Fair Value Measurements | Liabilities subject to fair value measurements are as follows:
|  | As of March 31, 2024
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Earnout Shares liability |  | $ | — |  | $ | — |  | $ | 61,393,000 |  | $ | 61,393,000
True Up Shares liability |  |  | — |  |  | — |  |  | 286,000 |  |  | 286,000
Subject Vesting Shares liability |  |  | — |  |  | — |  |  | 14,217,000 |  |  | 14,217,000
Total liabilities |  | $ | — |  | $ | — |  | $ | 75,896,000 |  | $ | 75,896,000
Schedule of Estimated Fair Value of the Earnout Shares | The Earnout term of 5 years and the Earnout mechanics represent contractual inputs. Assumptions such as risk-free rate, stock price, volatility, and discount rate were based on market data. See the following summary of key inputs:
|  | As of March 31, 2024 |  | As of March 14, 2024
Stock Price(1) |  | $ | 11.29 |  |  | 10.00 |
Volatility |  |  | 35 | % |  | 35 | %
Risk free rate of return |  |  | 4.17 | % |  | 4.24 | %
Expected term (in years) |  |  | 5.0 |  |  | 5.0 |
(1) At March 14, 2024, the $10.00 price represents the Business Combination price. |
Schedule of Earnout Share Liability |
|  | For the three months ended March 31, 2024
Earnout Shares Liability as of December 31, 2023 |  | $ | —
Assumed in the reverse recapitalization |  |  | 53,721,000
Change in fair value |  |  | 7,672,000
Balance as of March 31, 2024 |  | $ | 61,393,000
Schedule of Changes in the Fair Value of the True Up Shares liability | The following table presents the changes in the fair value of the True Up Shares liability at March 31, 2024.
|  | For the three months ended March 31, 2024
Balance as of December 31, 2023 |  | $ | — |
Assumed in the Business Combination |  |  | 555,000 |
Change in fair value |  |  | (269,000 | )
Balance as of March 31, 2024 |  | $ | 286,000 |
Schedule of Vesting Shares Liability | The following table presents the changes in the fair value of the Subject Vesting Shares liability at March 31, 2024.
|  | For the three months ended March 31, 2024
Balance as of December 31, 2023 |  | $ | —
Assumed in the Business Combination |  |  | 11,792,000
Change in fair value |  |  | 2,425,000
Balance as of March 31, 2024 |  | $ | 14,217,000
Power & Digital Infrastructure Acquisition II Corp. [Member] |  |
Fair Value Measurements (Tables) [Line Items] |  |
Schedule of Liabilities Subject to Fair Value Measurements |  | The following table presents information about the Company’s assets that are measured at fair value on a recurring basis as of December 31, 2023 and 2022 and indicates the fair value hierarchy of the valuation techniques that the Company utilized to determine such fair value.
Description |  | Level 1 |  | Level 2 |  | Level 3
December 31, 2023 – Assets |  |  |  |  |  |  |
Investments held in Trust Account |  | $ | 114,641,527 |  | — |  | —
December 31, 2022 – Assets |  |  |  |  |  |  |
Investments held in Trust Account |  | $ | 294,395,846 |  | — |  | —

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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://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 103 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-103 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + 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://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + 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/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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