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Selected Statement of Operations Data (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenues $ 18,062 $ 18,052 $ 20,928
United States [Member]      
Revenues 12,995 12,711 11,292
United Kingdom [Member]      
Revenues 457 589 904
Rest of Europe [Member]      
Revenues 2,724 2,744 5,793
Israel [Member]      
Revenues 977 880 1,417
Other [Member]      
Revenues $ 909 $ 1,128 $ 1,522