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Marketable Investments - Summary of Maturity Periods of the Marketable Investments (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
FY 2018	$ 17,551
FY 2019	26,772
FY2020	5,767
Total	50,090	$ 54,333
Federal Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
FY 2018	1,798
Total	1,798	1,793
Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
FY 2018	15,753
FY 2019	26,772
FY2020	5,767
Total	$ 48,292	$ 52,540

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Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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