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Other Accounts Receivable and Prepaid Expenses (Tables)
 12 Months Ended
Dec. 31, 2017
Other Accounts Receivable and Prepaid Expenses [Abstract]  
Schedule of other accounts receivable and prepaid expenses

   December 31, 
   2016  2017 
        
 Prepaid expenses $2,601  $2,659 
 Government authorities  3,426   4,900 
 Related parties  1,603   314 
 Other  857   770 
          
   $8,487  $8,643