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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Property, Plant and Equipment        
Property, plant and equipment, gross $ 5,527   $ 4,955 $ 3,446
Less: accumulated depreciation (2,144)   (1,871) (1,020)
Property, plant and equipment, net 3,383   3,084 2,426
Depreciation 273 $ 180 872 561
Vehicles        
Property, Plant and Equipment        
Property, plant and equipment, gross 354   354 386
Buildings        
Property, Plant and Equipment        
Property, plant and equipment, gross     43 43
Buildings and improvements        
Property, Plant and Equipment        
Property, plant and equipment, gross 43   43  
Computer equipment        
Property, Plant and Equipment        
Property, plant and equipment, gross 25   25 23
Furniture and fixtures        
Property, Plant and Equipment        
Property, plant and equipment, gross 3   3 3
Machinery and equipment        
Property, Plant and Equipment        
Property, plant and equipment, gross 1,404   1,404 1,140
Internal-use software        
Property, Plant and Equipment        
Property, plant and equipment, gross $ 3,698   $ 3,126 $ 1,851