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Marketable Securities Composition of Marketable Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities $ 4,096 $ 4,737
Available-for-sale Debt Securities, Amortized Cost Basis $ 4,095 $ 4,735