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Selected Statement of Operations Data (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Revenues $ 18,052 $ 20,928 $ 25,020
United States [Member]      
Revenues 12,711 11,292 14,411
United Kingdom [Member]      
Revenues 589 904 763
Rest of Europe [Member]      
Revenues 2,744 5,793 6,402
Israel [Member]      
Revenues 880 1,417 2,256
Other [Member]      
Revenues $ 1,128 $ 1,522 $ 1,188