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Property and Equipment (Tables)
12 Months Ended
Dec. 31, 2017
Property and Equipment [Abstract]  
Schedule of property and equipment
   December 31, 
   2016  2017 
 Cost:      
        
 Leasehold improvements $795  $918 
 Computers and peripheral equipment  14,059   14,842 
 Office furniture and equipment  3,111   3,778 
 Motor vehicles  1,186   1,237 
 Software  2,970   3,094 
          
    22,121   23,869 
 Accumulated depreciation:        
          
 Leasehold improvements  356   429 
 Computers and peripheral equipment  13,518   14,194 
 Office furniture and equipment  2,244   2,471 
 Motor vehicles  366   447 
 Software  2,572   2,860 
          
    19,056   20,401 
          
 Depreciated cost $3,065  $3,468