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Fair Value Measurements - Available For Sale (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Fair value of available for sale marketable securities    
Fair Value $ 148,235 $ 90,281
U.S. Treasury securities    
Fair value of available for sale marketable securities    
Amortized Cost 148,206 90,326
Gross Unrealized Gains 30  
Gross Unrealized Losses (1) (45)
Fair Value $ 148,235 $ 90,281