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Financial Instruments-Available for Sale Securities (Details 1) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Fair value of short term investment unrealized holdings and gains    
Amortized Cost $ 11,988 $ 16,989
Aggregate Fair Value 11,990 16,978
Unrealized Holding Gains 2 0
Unrealized Holding Losses $ 0 $ 11