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Marketable Securities - Maturity Schedule (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Marketable Securities, Interest Income $ 0 $ 110
Amortized Cost    
Amortized Cost 22,618,000 24,509,000
Fair Value    
Fair Value 22,619,000 24,513,000
Debt Securities    
Amortized Cost    
Due in less than one year 5,515,000 7,663,000
Due after one year and within two years 3,859,000 10,022,000
Amortized Cost 9,374,000 17,685,000
Fair Value    
Due in less than one year 5,516,000 7,668,000
Due after one year and within two years 3,859,000 10,021,000
Fair Value $ 9,375,000 $ 17,689,000