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Summary of Available-for-Sale Marketable Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities-matures after one year through three years, Amortized cost	$ 38,285	$ 42,810
Amortized cost, Total	48,661	48,253
Available-for-sale securities-matures after one year through three years, Gross unrealized gains	5	9
Gross unrealized gains, Total	6	9
Available-for-sale securities-matures after one year through three years, Gross unrealized losses	(318)	(383)
Gross unrealized losses, Total	(399)	(429)
Available-for-sale securities-matures after one year through three years, Fair value	37,972	42,436
Fair value, Total	48,268	47,833
Certificates of deposits
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities-matures after one year through three years, Amortized cost	1	1,975
Available-for-sale securities-matures after one year through three years, Fair value	1	1,975
Fair value, Total	1	1,975
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities-matures within one year, Amortized cost	10,376	5,443
Available-for-sale securities-matures after one year through three years, Amortized cost	38,284	40,835
Available-for-sale securities-matures within one year, Gross unrealized gains	1
Available-for-sale securities-matures after one year through three years, Gross unrealized gains	5	9
Available-for-sale securities-matures within one year, Gross unrealized losses	(81)	(46)
Available-for-sale securities-matures after one year through three years, Gross unrealized losses	(318)	(383)
Available-for-sale securities-matures within one year, Fair value	10,296	5,397
Available-for-sale securities-matures after one year through three years, Fair value	$ 37,971	$ 40,461

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