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Related Party Transactions (Tables)
 6 Months Ended
Jun. 30, 2025
Related Party Transactions [Abstract]  
Schedule of Related Party Transactions
The following table summarizes the related party transactions included in the condensed consolidated statements of operations and comprehensive loss:
Three Months Ended June 30,Six Months Ended June 30,
$ in thousands2025202420252024
Master services agreement administrative costs$42 $27 $69 $52 
General and administrative$42 $27 $69 $52 
Master services agreement costs for Demonstration Plant$668 $395 $1,254 $662 
BHES JDA
20,178 11,819 38,005 20,165 
Research and development$20,846 $12,214 $39,259 $20,827 
BHES Limited Notice to Proceed19,533 — 19,533 — 
Project development$19,533 $— $19,533 $— 
Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award The following tables display the expense recognized in the consolidated statement of comprehensive income for
shares distributed as payment for services rendered under the terms of the BHES JDA during the periods described below:
QuantityExpense Recognized
Three Months Ended June 30,Three Months Ended June 30,
in thousands2025202420252024
Class A OpCo Units1,562942$10,323 $6,228 
Class B Common Stock1,562942— — 
Total$10,323 $6,228 
QuantityExpense Recognized
Six Months Ended June 30,Six Months Ended June 30,
in thousands2025202420252024
Class A OpCo Units2,8091,592$18,570 $10,526 
Class B Common Stock2,8091,592— — 
Total$18,570 $10,526 
The following table disaggregates the variable share-based compensation payable to BHES should it meet its milestone objectives:
$ in thousandsPerformance Period End DateCompensation Cost Incurred To DateRemaining Compensation CostTotal Compensation Cost
BHES JDA January 2027$24,216 $3,129 $27,345