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Selected Statements of Income Data (Tables)
 12 Months Ended
Dec. 31, 2017
Selected Statements of Income Data [Abstract]  
Schedule of research and development costs, net

   Year ended December 31, 
   2015  2016  2017 
           
 Total costs $8,735  $10,063  $10,713 
 Less - capitalized software costs  (3,847)  (4,224)  (3,771)
              
 Research and development, net $4,888  $5,839  $6,942 
Schedule of financial income (expenses), net

 Bank charges and interest from loans offset by interest from short term deposits $64  $(199) $(1,124)
 Interest expenses related to liabilities in connection with acquisitions  -   (257)  (62)
 Interest income from marketable securities, net of amortization of premium on marketable securities  231   240   284 
 Loss arising from foreign currency translation and other  (980)  (214)  (809)
              
 Financial income(expenses), net $(685) $(430) $(1,711)