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Segment Geographical Information and Major Customers (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenue, Major Customer [Line Items]      
Total revenues $ 258,140 $ 201,646 $ 176,030
Israel [Member]      
Revenue, Major Customer [Line Items]      
Total revenues 91,917 58,079 36,401
Europe [Member]      
Revenue, Major Customer [Line Items]      
Total revenues 26,635 23,642 29,084
United States [Member]      
Revenue, Major Customer [Line Items]      
Total revenues 123,113 100,470 92,577
Japan [Member]      
Revenue, Major Customer [Line Items]      
Total revenues 9,253 11,226 10,092
Other [Member]      
Revenue, Major Customer [Line Items]      
Total revenues $ 7,222 $ 8,229 $ 7,876