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Property, Plant, and Equipment (Tables)
 6 Months Ended
Jun. 30, 2025
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
The following table summarizes the key classifications of property, plant, and equipment included in the condensed consolidated balance sheets:
June 30,December 31,
$ in thousands20252024
Demonstration Plant$122,352 $122,845 
Furniture and equipment1,173 1,069 
Assets acquired under finance lease349 349 
Construction-in-progress3,326 48,438 
Total property, plant, and equipment, gross127,200 172,701 
Accumulated depreciation and amortization (1)
(30,605)(21,231)
Total property, plant, and equipment, net$96,595 $151,470 
___________
(1) As of June 30, 2025 and December 31, 2024, $45 thousand and $18 thousand, respectively, of accumulated depreciation and amortization is related to amortization of the finance lease right-of-use assets.
The following table presents the Company’s depreciation expense for the following periods:
Three Months Ended June 30,Six Months Ended June 30,
$ in thousands2025202420252024
Depreciation expense
$4,613 $3,176 $9,347 $6,353