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Property, Plant, and Equipment
 9 Months Ended
Sep. 30, 2023
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Property, Plant and Equipment
The following table summarizes the key classifications of property, plant and equipment as of September 30, 2023 (Successor) and December 31, 2022 (Predecessor):
September 30, 2023 (Successor)December 31, 2022 (Predecessor)
Furniture and Equipment, gross$253 $368 
Accumulated Depreciation(17)(216)
Furniture and Equipment, net236 152 
Demonstration Plant, gross89,240 128,013 
Accumulated Depreciation(3,955)(58,570)
Demonstration Plant, net85,285 69,443 

Construction in Progress6,237 — 

Total Property, Plant and Equipment, net$91,758 $69,595 
Depreciation expense for the period from January 1, 2023 through June 7, 2023 (Predecessor), the period from June 8, 2023 through September 30, 2023 (Successor) and the period from July 1, 2023 through September 30, 2023 was $5,700, $3,972 and $3,173, respectively. Depreciation expense for the three month and nine month periods ended September 30, 2022 (Predecessor) was $3,266 and $9,797, respectively.
Asset Retirement Obligation - The following table disaggregates the contents of the Company's asset retirement obligation included in Property, Plant and equipment, net on the Consolidated Balance Sheets as of December 31, 2022 (Predecessor):
December 31, 2022 (Predecessor)
Asset Retirement Obligation, gross$2,201 
Accumulated Depreciation(348)
Asset Retirement Obligation, net$1,853