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MARKETABLE SECURITIES (Tables)
 12 Months Ended
Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]  
Schedule of Marketable Securities Calssified as Available-for-sale Securities
At December 31, 2018, the Company held marketable securities classified as available-for-sale securities as follows:
 
   
December 31, 2018
  
   
Amortized cost
    
Gross unrealized gains
    
Gross unrealized losses
    
Fair value
  
                         
Treasury bonds within one year maturity
  
$
2,967
      
2
    
$
-
    
$
2,969
  
Corporate bonds:
            
-
                  
     Maturing within one year
    
20,061
      
-
      
(38
)
    
20,023
  
Maturing within between one to five years
    
47,504
      
-
      
(279
)
    
47,225
  
     
67,565
      
-
      
(317
)
    
67,248
  
   
$
70,532
      
2
    
$
(317
)
  
$
70,217
  

 
At December 31, 2017, the Company held marketable securities classified as available-for-sale securities as follows:

   
December 31, 2017
  
   
Amortized cost
    
Gross unrealized gains
    
Gross unrealized losses
    
Fair value
  
                         
Certificates of deposits
  
$
11,075
      
-
    
$
(62
)
  
$
11,013
  
Corporate bonds:
            
-
                  
     Maturing within one year
    
2,113
      
-
      
(10
)
    
2,103
  
Maturing within between one to five years
    
19,833
      
-
      
(219
)
    
19,614
  
     
21,946
      
-
      
(229
)
    
21,717
  
   
$
33,021
      
-
    
$
(291
)
  
$
32,730