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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, 2019
Dec. 31, 2018
Disclosure of operating segments [line items]    
Property, plant and equipment $ 138,938 $ 111,067
Taiwan [Member]    
Disclosure of operating segments [line items]    
Property, plant and equipment 136,986 109,732
U.S. [Member]    
Disclosure of operating segments [line items]    
Property, plant and equipment 730 668
China [Member]    
Disclosure of operating segments [line items]    
Property, plant and equipment 803 540
Korea [Member]    
Disclosure of operating segments [line items]    
Property, plant and equipment 95 83
Israel [Member]    
Disclosure of operating segments [line items]    
Property, plant and equipment 265 28
Japan [Member]    
Disclosure of operating segments [line items]    
Property, plant and equipment $ 59 $ 16