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Long-Term Borrowings - Long-Term Borrowings (Details) - USD ($)
$ in Thousands
Sep. 02, 2020
Dec. 31, 2020
Aug. 04, 2020
Dec. 31, 2019
IFRS Statement [Line Items]        
Unsecured borrowings   $ 0   $ 57,339
Debt Instrument Collateral Amounts   193,000    
Chang Hwa Bank [Member]        
IFRS Statement [Line Items]        
Unsecured borrowings $ 20,000   $ 40,000  
Debt instrument term 10 years      
Long-term borrowings [member]        
IFRS Statement [Line Items]        
Unsecured borrowings   58,500    
Debt Instrument Collateral Amounts   $ 71,116