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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