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Summary of Available-for-Sale Marketable Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale-matures within one year, Amortized cost	$ 12,495	$ 9,456
Available-for-sale-matures within one year through five years, Amortized cost	62,188	52,991
Amortized cost, Total	74,683	62,447
Available-for-sale-matures within one year, Gross unrealized gains	13	4
Available-for-sale-matures after one year through five years, Gross unrealized gains	91	3
Gross unrealized gains, Total	104	7
Available-for-sale-matures within one year, Gross unrealized losses	(5)	(15)
Available-for-sale-matures after one year through five years, Gross unrealized losses	(323)	(571)
Gross unrealized losses, Total	(328)	(586)
Available-for-sale-matures within one year, Fair value	12,503	9,445
Available-for-sale-matures after one year through five years, Fair value	61,956	52,423
Fair value, Total	74,459	61,868
Certificates of deposits
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale-matures within one year through five years, Amortized cost	747
Available-for-sale-matures after one year through five years, Fair value	747
Fair value, Total	747
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale-matures within one year, Amortized cost	12,495	9,456
Available-for-sale-matures within one year through five years, Amortized cost	60,940	52,490
Available-for-sale-matures within one year, Gross unrealized gains	13	4
Available-for-sale-matures after one year through five years, Gross unrealized gains	91	3
Available-for-sale-matures within one year, Gross unrealized losses	(5)	(15)
Available-for-sale-matures after one year through five years, Gross unrealized losses	(319)	(567)
Available-for-sale-matures within one year, Fair value	12,503	9,445
Available-for-sale-matures after one year through five years, Fair value	60,712	51,926
Government bonds
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale-matures within one year through five years, Amortized cost	501	501
Available-for-sale-matures after one year through five years, Gross unrealized losses	(4)	(4)
Available-for-sale-matures after one year through five years, Fair value	497	497
Fair value, Total	$ 497	$ 497

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