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Segment, Product and Geographic Information (Details 3) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Disclosure of operating segments [line items]      
Property, plant and equipment $ 111,067 $ 84,575 $ 47,309
Taiwan [Member]      
Disclosure of operating segments [line items]      
Property, plant and equipment 109,732 83,730 46,445
U.S. [Member]      
Disclosure of operating segments [line items]      
Property, plant and equipment 668 25 45
China [Member]      
Disclosure of operating segments [line items]      
Property, plant and equipment 540 651 751
Korea [Member]      
Disclosure of operating segments [line items]      
Property, plant and equipment 83 150 47
Israel [Member]      
Disclosure of operating segments [line items]      
Property, plant and equipment 28 0 0
Japan [Member]      
Disclosure of operating segments [line items]      
Property, plant and equipment $ 16 $ 19 $ 21