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Summary of Available-for-Sale Marketable Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale-matures within one year, Amortized cost	$ 15,353	$ 9,456
Available-for-sale-matures within one year through five years, Amortized cost	58,169	52,991
Amortized cost, Total	73,522	62,447
Available-for-sale-matures within one year, Gross unrealized gains	10	4
Available-for-sale-matures after one year through five years, Gross unrealized gains	50	3
Gross unrealized gains, Total	60	7
Available-for-sale-matures within one year, Gross unrealized losses	(18)	(15)
Available-for-sale-matures after one year through five years, Gross unrealized losses	(355)	(571)
Gross unrealized losses, Total	(373)	(586)
Available-for-sale-matures within one year, Fair value	15,345	9,445
Available-for-sale-matures after one year through five years, Fair value	57,864	52,423
Fair value, Total	73,209	61,868
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale-matures within one year, Amortized cost	15,353	9,456
Available-for-sale-matures within one year through five years, Amortized cost	57,668	52,490
Available-for-sale-matures within one year, Gross unrealized gains	10	4
Available-for-sale-matures after one year through five years, Gross unrealized gains	50	3
Available-for-sale-matures within one year, Gross unrealized losses	(18)	(15)
Available-for-sale-matures after one year through five years, Gross unrealized losses	(350)	(567)
Available-for-sale-matures within one year, Fair value	15,345	9,445
Available-for-sale-matures after one year through five years, Fair value	57,368	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	(5)	(4)
Available-for-sale-matures after one year through five years, Fair value	496	497
Fair value, Total	$ 496	$ 497

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