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Marketable Securities (Tables)
 12 Months Ended
Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]  
Held-to-Maturity Securities
The Company's investment in marketable securities as of December 31, 2018 and 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 December 31, 2019
                        
Held to maturity:
                        
Corporate debt securities and government debt securities
                        
Current
    
14,170
      
24
      
(97
)
    
14,097
  
Non-Current
    
46,955
      
408
      
(112
)
    
47,251
  
                                 
     
61,125
      
432
      
(209
)
    
61,348
  
                                 
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 thousand and US$ 538 thousand as of December 31, 2018 and 2019 respectively.
The accrued interest is presented as part of other account receivable on the balance sheet.
Schedule of Reconciliation of Marketable Securities
Activity in marketable securities in 2019
  
US$ thousands
  
       
Balance at January 1, 2019
    
47,662
  
         
Purchases of marketable securities
    
15,604
  
Discount on marketable securities, net
    
(144
)
Proceeds from maturity of marketable securities
    
(1,997
)
Balance at December 31, 2019
    
61,125
  
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 December 31, 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
    
(38
)
    
4,968
      
(171
)
    
20,100
      
(209
)
    
25,068