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Investments - BKV-CIP Joint Venture (Details) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 6 Months Ended | 14 Months Ended
--- | --- | --- | --- | --- | ---
May 09, 2026 USD ($) shares | May 08, 2025 USD ($) $ / shares shares | Jun. 30, 2026 USD ($) shares | Mar. 31, 2026 USD ($) | Jun. 30, 2025 USD ($) | Jun. 30, 2026 USD ($) shares | Jun. 30, 2025 | Jun. 30, 2026 USD ($) shares
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Contributions from noncontrolling interest |  |  | $ 9,200 | $ 4,200 | $ 4,353 |  |  |
BKV dCarbon Project, LLC |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Joint venture formation, fair value of joint venture |  | $ 40,300 | 48,800 |  |  | $ 48,800 |  | $ 48,800
Section 45Q accrued receivables |  | 4,100 |  |  |  |  |  |
Assets contributed during the period | $ 4,500 |  |  |  |  |  |  |
Contribution by non-controlling interest in joint venture |  | $ 500,000 |  |  |  |  |  |
Percentage of noncontrolling interest (percent) |  | 0.49 |  |  |  |  |  |
Contributions from noncontrolling interest |  |  | $ 9,200 |  |  | $ 13,400 |  | $ 31,300
Temporary equity, stock issued during period, shares, new issues | shares |  |  |  |  |  | 3,131,155 |  |
Temporary equity, liquidation preference, percentage |  |  | 0.48 |  | 0.58 | 0.50 | 0.58 |
BKV dCarbon Project, LLC | Class B Members |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Temporary equity, liquidation preference, percentage |  |  | 0.52 |  | 0.42 | 0.50 | 0.42 |
BKV dCarbon Project, LLC | Class A Units |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Temporary equity issued (in units) | shares | 448,395 | 4,796,421 | 5,244,816 |  |  | 5,244,816 |  | 5,244,816
Temporary equity, price per share (in USD per unit) | $ / shares |  | $ 10.00 |  |  |  |  |  |
BKV dCarbon Project, LLC | Class B Units |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Temporary equity, price per share (in USD per unit) | $ / shares |  | $ 10.00 |  |  |  |  |  |

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