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Related Party Transactions (Tables)
 9 Months Ended
Sep. 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 September 30,Nine Months Ended September 30,
$ in thousands2025202420252024
Master services agreement administrative costs$21 $30 $90 $82 
General and administrative$21 $30 $90 $82 
Master services agreement costs for Demonstration Plant$457 $160 $1,711 $1,025 
BHES JDA
17,307 12,865 55,312 33,030 
Research and development$17,764 $13,025 $57,023 $34,055 
BHES Limited Notice to Proceed— — 19,533 — 
Project development$— $— $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 September 30,Three Months Ended September 30,
in thousands2025202420252024
Class A OpCo Units1,3571,030$8,971 $6,807 
Class B Common Stock1,3571,030— — 
Total$8,971 $6,807 
QuantityExpense Recognized
Nine Months Ended September 30,Nine Months Ended September 30,
in thousands2025202420252024
Class A OpCo Units4,1662,623$27,541 $17,336 
Class B Common Stock4,1662,623— — 
Total$27,541 $17,336 
The following table disaggregates the variable share-based compensation payable to BHES should it meet its milestone objectives:
$ in thousandsCompensation Cost Incurred To DateRemaining Compensation CostTotal Compensation Cost
BHES JDA $24,390 $2,955 $27,345