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Accrued Expenses and Other Accounts Payable (Tables)
12 Months Ended
Dec. 31, 2017
Accrued Expenses and Other Accounts Payable [Abstract]  
Schedule of accrued expenses and other accounts payable
   December 31, 
   2016  2017 
        
 Employees and payroll accruals $11,245  $15,203 
 Accrued expenses  4,955   6,234 
 Government authorities  2,871   4,738 
 Other  1,219   1,614 
          
   $20,290  $27,789