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)
$ in Thousands
Jun. 30, 2018
USD ($)
Available For Sale Securities [Abstract]  
Due within one year $ 42,068