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Marketable Investments - Summary of Company's Marketable Investments (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 50,348	$ 54,521
Gross Unrealized Losses	(258)	(188)
Market Value	50,090	54,333
Federal Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,800	1,800
Gross Unrealized Losses	(2)	(7)
Market Value	1,798	1,793
Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	48,548	52,721
Gross Unrealized Losses	(256)	(181)
Market Value	$ 48,292	$ 52,540

X

- Definition

Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.

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