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Long-Lived Assets - Intangible Assets, amortization expense (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Aggregate amortization expense for intangible assets    
2023   $ 65
2024   65
2025   65
2026   65
2027   65
Thereafter   477
Aggregate amortization expense $ 997 $ 802