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Marketable Securities (Tables)
 9 Months Ended
Sep. 30, 2016
Investments, Debt and Equity Securities [Abstract]  
Schedule of Available-for-sale Securities Reconciliation

The amortized cost, gross unrealized holding gains, gross unrealized holding losses, and fair value for available-for-sale securities by major security type and class of securities at September 30, 2016 and December 31, 2015 were as follows:

 

    Amortized cost     Gross unrealized holding gains     Gross unrealized holding losses     Estimated
fair value		  
September 30, 2016                                
Available-for-sale securities:                                
Corporate bonds and notes   $ 20,566     $ 212     $ (17 )   $ 20761  
Municipal bonds     6,997       28       (5 )     7,020  
Total available-for-sale securities   $ 27,563     $ 240     $ (22 )   $ 27,781  

 

    Amortized cost     Gross unrealized holding gains     Gross unrealized holding losses     Estimated
fair value		  
December 31, 2015                                
Available-for-sale securities:                                
Corporate bonds and notes   $ 20,827     $ 50     $ (133 )   $ 20,744  
Municipal bonds     5,608       18       (5 )     5,621  
Total available-for-sale securities   $ 26,435     $ 68     $ (138 )   $ 26,365  
Schedule of Maturities of Marketable Securities

Maturities of marketable securities classified as available-for-sale securities were as follows at September 30, 2016:

 

    Amortized
cost		     Estimated
fair value		  
September 30, 2016                
Due within one year   $ 7,053     $ 7,059  
Due after one year through five years     19,532       19,721  
Due after five years through ten years     978       1,001  
Total available-for-sale securities   $ 27,563     $ 27,781  
Schedule of Available-for-sale Securities

The available-for-sale marketable securities in a gross unrealized loss position as of September 30, 2016 are summarized as follows:

 

    Less than 12 months     More than 12 months     Total  
(In thousands)   Estimated fair value     Gross unrealized holding losses     Estimated fair value     Gross unrealized holding losses     Estimated fair value     Gross unrealized holding losses  
As of September 30, 2016                                    
Corporate bonds and notes   $ 3,012     $ (8 )   $ 1,841     $ (8 )   $ 4,853     $ (16 )
Municipal bonds     779       (6 )     315       -       1,094       (6 )
                                                 
    $ 3,791     $ (14 )   $ 2,156     $ (8 )   $ 5,947     $ (22 )