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Marketable Securities (Tables)
 6 Months Ended
Jun. 30, 2019
Investments, Debt and Equity Securities [Abstract]  
Held-to-Maturity Securities
 
The Company's investment in marketable securities as of December 31, 2018 and June 30, 2019 are classified as “held-to-maturity” and consist of the following:

         
Gross
    
Gross
        
         
unrealized
    
unrealized
        
   
Amortized
    
holding
    
holding
    
Aggregate
  
   
cost basis**
    
gains
    
(losses)
    
fair value*
  
   
US$ thousands
  
At June 30, 2019
                        
Held to maturity:
                        
Corporate debt securities and government debt securities
                        
Current
    
5,979
      
2
      
(59
)
    
5,922
  
Non-Current
    
53,970
      
369
      
(155
)
    
54,184
  
                                 
     
59,949
      
371
      
(214
)
    
60,106
  
                                 
At December 31, 2018
                                
Held to maturity:
                                
Corporate debt securities and government debt securities
                                
Current
    
1,610
      
-
      
(22
)
    
1,588
  
Non-Current
    
46,052
      
-
      
(778
)
    
45,274
  
                                 
     
47,662
      
-
      
(800
)
    
46,862
  

 
*
Fair value is being determined using quoted market prices in active markets (Level 2).
 
**
Including accrued interest in the amount of US$ 450 thousands and US$ 520 thousands as of December 31, 2018 and June 30, 2019 respectively.
Schedule of Reconciliation of Marketable Securities
 
Activity in marketable securities in six month period ended in June 30, 2019:

   
US$ thousands
  
Balance at January 1, 2019
    
47,662
  
         
Purchases of marketable securities
    
12,754
  
Discount on marketable securities, net
    
(70
)
Proceeds from maturity of marketable securities
    
(397
)
Balance at June 30, 2019
    
59,949
Summary of Investment Securities in an Unrealized Loss Position
The following table summarizes the gross unrealized losses on investment securities for which other-than-temporary impairments have not been recognized and the fair value of those securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at June 30, 2019:
  

   
Less than 12 months
    
12 months or more
    
Total
  
   
Unrealized Losses
    
Fair value
    
Unrealized Losses
    
Fair value
    
Unrealized Losses
    
Fair value
  
Held to maturity
                                     
Corporate debt securities and government debt securities
    
(12
)
    
2,516
      
(202
)
    
22,028
      
(214
)
    
24,544