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Marketable Securities and Fair Value Disclosures - Summary of Amortized Cost and Estimated Fair Value of Available-for-Sale Securities by Contractual Maturity (Details)
$ in Thousands
Sep. 30, 2016
USD ($)
Investments Debt And Equity Securities [Abstract]  
Due in one year or less, Amortized Cost $ 15,382
Due in one to two years, Amortized Cost 3,964
Amortized Cost 19,346
Due in one year or less, Fair Value 15,373
Due in one to two years, Fair Value 3,967
Fair Value $ 19,340