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Fixed Assets, Net - Summary (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Property, Plant and Equipment [Line Items]    
Office furniture and equipment $ 99 $ 60
Leasehold improvements 43 43
Fixed assets, gross 142 103
Accumulated depreciation and amortization (85) (63)
Fixed assets, net, after accumulated amortization 57 40
Operating lease ROU assets, net 181 235
Total 238 275
Depreciation expense $ 21 152
Demonstration Burners    
Property, Plant and Equipment [Line Items]    
Impairment of Machinery and Equipment   81
Machinery and Equipment capitalized   209
Accumulated depreciation   $ 128