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Income Taxes- Expiration period for unrecognized deferred tax assets (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
IFRS Statement [Line Items]  
Unrecognized deferred tax assets $ 45,769
Taiwan [Member] | Expiration year 2020 to 2024 [Member]  
IFRS Statement [Line Items]  
Deductible amount 90,601
Unrecognized deferred tax assets $ 18,120
Expiration year 2020~2024
Taiwan [Member] | Expiration year 2025 To 2029 [Member]  
IFRS Statement [Line Items]  
Deductible amount $ 108,690
Unrecognized deferred tax assets $ 21,738
Expiration year 2025~2029
Hong Kong [Member]  
IFRS Statement [Line Items]  
Deductible amount $ 1,820
Unrecognized deferred tax assets $ 150
Expiration year Indefinitely
U.S. [Member] | Expiration year 2024 To 2039 [Member]  
IFRS Statement [Line Items]  
Deductible amount $ 11,789
Unrecognized deferred tax assets $ 3,078
Expiration year 2024~2039
Israel [Member]  
IFRS Statement [Line Items]  
Deductible amount $ 11,666
Unrecognized deferred tax assets $ 2,683
Expiration year Indefinitely