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Segment, Product and Geographic Information - Carrying values of the Company's tangible long-lived assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Segment, Product and Geographic Information    
Property, plant and equipment $ 121,280 $ 130,109
Taiwan    
Segment, Product and Geographic Information    
Property, plant and equipment 117,784 126,993
U.S.    
Segment, Product and Geographic Information    
Property, plant and equipment 1,433 1,396
China    
Segment, Product and Geographic Information    
Property, plant and equipment 1,688 1,442
Korea    
Segment, Product and Geographic Information    
Property, plant and equipment 286 239
Japan    
Segment, Product and Geographic Information    
Property, plant and equipment $ 89 $ 39