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Long-Term Borrowings - Long-Term Borrowings (Details) - USD ($)
$ in Thousands
Sep. 02, 2020
Dec. 31, 2023
Dec. 31, 2022
Aug. 04, 2020
Chang Hwa Bank        
Long-Term Borrowings        
Unsecured borrowings $ 20,000     $ 40,000
Debt instrument term 10 years      
Long-Term Borrowings        
Long-Term Borrowings        
Unsecured borrowings   $ 40,500 $ 46,500  
Pledged collateral amount   $ 63,352 $ 65,571