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Marketable Securities - Available-for-sale Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax $ 177 $ 68
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (53) (138)
Due within one year, Amortized Cost 5,881  
Due within one year, Estimated fair value 5,890  
Due after one year through five years, Amortized Cost 19,247  
Due after one year through five years, Estimated fair value 19,365  
Due after five years through ten years, Amortized Cost 985  
Due after five years through ten years, Estimated fair value 982  
Total available-for-sale securities, Amortized Cost 26,113 26,435
Total available-for-sale securities, Estimated fair value 26,237 26,365
Corporate Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 136 50
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (52) (133)
Total available-for-sale securities, Amortized Cost 19,422 20,827
Total available-for-sale securities, Estimated fair value 19,506 20,744
Municipal Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 41 18
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax (1) (5)
Total available-for-sale securities, Amortized Cost 6,691 5,608
Total available-for-sale securities, Estimated fair value $ 6,731 $ 5,621