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Income Taxes- Expiration period for unrecognized deferred tax assets (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
USD ($)
Statement [line items]  
Unrecognized deferred tax assets $ 44,053
Taiwan operations | Expiration Year 2024 To 2028  
Statement [line items]  
Deductible amount 106,123
Unrecognized deferred tax assets $ 21,225
Expiration year 2024~2028
Taiwan operations | Expiration Year 2029 To 2033  
Statement [line items]  
Deductible amount $ 94,342
Unrecognized deferred tax assets $ 18,868
Expiration year 2029~2033
Hong Kong operations  
Statement [line items]  
Deductible amount $ 1,815
Unrecognized deferred tax assets $ 150
Expiration year Indefinitely
US operations | Expiration 2024 to Indefinitely  
Statement [line items]  
Deductible amount $ 13,676
Unrecognized deferred tax assets $ 3,810
Expiration year 2024~Indefinitely