v3.25.3
Property, Plant, and Equipment
 9 Months Ended
Sep. 30, 2025
Property, Plant and Equipment [Abstract]  
Property, Plant, and Equipment
NOTE 7 — Property, Plant, and Equipment
The following table summarizes the key classifications of property, plant, and equipment included in the condensed consolidated balance sheets:
September 30,December 31,
$ in thousands20252024
Demonstration Plant$13,739 $122,845 
Furniture and equipment133 1,069 
Assets acquired under finance lease45 349 
Construction-in-progress2,672 48,438 
Total property, plant, and equipment, gross16,589 172,701 
Accumulated depreciation and amortization (1)
(244)(21,231)
Total property, plant, and equipment, net$16,345 $151,470 
___________
(1) As of September 30, 2025 and December 31, 2024, $1 thousand and $18 thousand, respectively, of accumulated depreciation and amortization is related to amortization of the finance lease right-of-use assets.
Refer to Note 3 — Impairment and other charges for discussion of impairments.
The following table presents the Company’s depreciation and amortization expense for the following periods:
Three Months Ended September 30,Nine Months Ended September 30,
$ in thousands2025202420252024
Depreciation and amortization expense
$3,374 $3,328 $12,747 $9,681 
The Company regularly evaluates whether events or changes in circumstances warrant a revision to the remaining estimated useful lives of its long-lived assets.