Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Financial Instruments - Summary of Estimated Fair Value of Company's Investments in Marketable Securities, Accounted for as Available-for-Sale Securities (Details)

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Fair Value of Financial Instruments - Summary of Estimated Fair Value of Company's Investments in Marketable Securities, Accounted for as Available-for-Sale Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Available For Sale Securities [Abstract]    
Due within one year $ 15,081  
Due in one year through five years 7,250  
Total $ 22,331 $ 16,793