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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, 2020
Dec. 31, 2019
Disclosure of operating segments [line items]    
Property, plant and equipment $ 132,074 $ 138,938
Taiwan [Member]    
Disclosure of operating segments [line items]    
Property, plant and equipment 128,941 136,986
U.S. [Member]    
Disclosure of operating segments [line items]    
Property, plant and equipment 1,413 730
China [Member]    
Disclosure of operating segments [line items]    
Property, plant and equipment 878 803
Korea [Member]    
Disclosure of operating segments [line items]    
Property, plant and equipment 524 95
Israel [Member]    
Disclosure of operating segments [line items]    
Property, plant and equipment 167 265
Japan [Member]    
Disclosure of operating segments [line items]    
Property, plant and equipment $ 151 $ 59