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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, 2023
Dec. 31, 2022
Segment, Product and Geographic Information    
Property, plant and equipment. $ 130,109 $ 126,138
Taiwan    
Segment, Product and Geographic Information    
Property, plant and equipment. 126,993 123,361
US operations    
Segment, Product and Geographic Information    
Property, plant and equipment. 1,396 1,595
China    
Segment, Product and Geographic Information    
Property, plant and equipment. 1,442 834
Korea    
Segment, Product and Geographic Information    
Property, plant and equipment. 239 245
Japan    
Segment, Product and Geographic Information    
Property, plant and equipment. $ 39 $ 103