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Property, Plant and Equipment, and Asset Impairment (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Property, Plant and Equipment, and Asset Impairment              
Depreciation expense $ 100   $ 300 $ 620 $ 1,576 $ 1,860 $ 2,723
Asset impairment $ 0 $ 2,600 $ 0 $ 2,649 $ 0    
Impairment of leasehold improvements   2,200          
Impairment on the right-of-use asset   $ 400