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Income Taxes- Expiration period for unrecognized deferred tax assets (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
USD ($)
Statement [line items]  
Unrecognized deferred tax assets $ 42,071
Taiwan | Expiration Year 2023 To 2027  
Statement [line items]  
Deductible amount 101,704
Unrecognized deferred tax assets $ 20,341
Expiration year 2023~2027
Taiwan | Expiration Year 2028 To 2032  
Statement [line items]  
Deductible amount $ 90,417
Unrecognized deferred tax assets $ 18,083
Expiration year 2028~2032
Hong Kong  
Statement [line items]  
Deductible amount $ 1,815
Unrecognized deferred tax assets $ 150
Expiration year Indefinitely
U.S. | Expiration 2024 to Indefinitely  
Statement [line items]  
Deductible amount $ 12,323
Unrecognized deferred tax assets $ 3,497
Expiration year 2024~Indefinitely