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Segment Information (Tables)
12 Months Ended
Dec. 31, 2018
Segment Information [Abstract]  
Schedule of Revenues by Geographic Area
Revenues are attributable to geographic areas/countries based upon the destination of shipment of products and related services as follows:

   
Year Ended December 31,
 
   
2018
   
2017
   
2016
 
   
U.S. Dollars (in thousands)
 
Asia Pacific
   
98,468
     
79,105
     
66,275
 
United States
   
13,227
     
9,484
     
8,151
 
Europe
   
11,479
     
4,896
     
4,802
 
                         
     
123,174
     
93,485
     
79,228