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Marketable Investments - Summary of Company's Marketable Investments (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 54,077	$ 61,281
Gross Unrealized Gains	7	2
Gross Unrealized Losses	(65)	(136)
Market Value	54,019	61,147
Federal Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,800	1,800
Gross Unrealized Losses	(4)	(7)
Market Value	1,796	1,793
Corporate Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	52,277	59,481
Gross Unrealized Gains	7	2
Gross Unrealized Losses	(61)	(129)
Market Value	$ 52,223	$ 59,354

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- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

+ References

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-Publisher FASB
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