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Assets (Details 2) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Total available-for-sale securities    
Amortized Cost $ 104,961 $ 116,064
Gross Unrealized Gains 18 10
Gross Unrealized Losses   (24)
Estimated Fair Value 104,979 116,050
Available-for-sale securities in a loss position    
Estimated Fair value 0 68,275
Gross Unrealized Losses   (24)
Investments that had been in a continuous loss position for more than 12 months 0 0
U.S. treasuries    
Total available-for-sale securities    
Amortized Cost 92,749 94,935
Gross Unrealized Gains 16 6
Gross Unrealized Losses   (23)
Estimated Fair Value 92,765 94,918
Available-for-sale securities in a loss position    
Estimated Fair value   64,922
Gross Unrealized Losses   (23)
Government agency securities    
Total available-for-sale securities    
Amortized Cost 9,997 12,985
Gross Unrealized Gains 2 3
Estimated Fair Value 9,999 12,988
Corporate debt    
Total available-for-sale securities    
Amortized Cost 2,215 8,144
Gross Unrealized Gains   1
Gross Unrealized Losses   (1)
Estimated Fair Value $ 2,215 8,144
Available-for-sale securities in a loss position    
Estimated Fair value   3,353
Gross Unrealized Losses   $ (1)