Summary of Available-for-Sale Marketable Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale-matures within one year, Amortized cost	$ 6,085	$ 9,258
Available-for-sale-matures within one year through three years, Amortized cost	48,446	39,501
Amortized cost, Total	54,531	48,759
Available-for-sale-matures within one year, Gross unrealized gains		1
Available-for-sale-matures after one year through three years, Gross unrealized gains	40
Gross unrealized gains, Total	40	1
Available-for-sale-matures within one year, Gross unrealized losses	(19)	(50)
Available-for-sale-matures after one year through three years, Gross unrealized losses	(261)	(444)
Gross unrealized losses, Total	(280)	(494)
Available-for-sale-matures within one year, Fair value	6,066	9,209
Available-for-sale-matures after one year through three years, Fair value	48,225	39,057
Fair value, Total	54,291	48,266
Certificates of deposits
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale-matures within one year, Amortized cost	1	1
Available-for-sale-matures within one year, Fair value	1	1
Fair value, Total	1	1
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale-matures within one year, Amortized cost	6,084	9,257
Available-for-sale-matures within one year through three years, Amortized cost	47,945	39,501
Available-for-sale-matures within one year, Gross unrealized gains		1
Available-for-sale-matures after one year through three years, Gross unrealized gains	40
Available-for-sale-matures within one year, Gross unrealized losses	(19)	(50)
Available-for-sale-matures after one year through three years, Gross unrealized losses	(260)	(444)
Available-for-sale-matures within one year, Fair value	6,065	9,208
Available-for-sale-matures after one year through three years, Fair value	47,725	$ 39,057
Government bonds
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale-matures within one year through three years, Amortized cost	501
Available-for-sale-matures after one year through three years, Gross unrealized losses	(1)
Available-for-sale-matures after one year through three years, Fair value	500
Fair value, Total	$ 500

Available for sale matures after one year through three years, gross unrealized gains.

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Available For Sale Matures After One Year Through Three Years Gross Unrealized Loss

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Available for sale matures within one year, gross unrealized gains.

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Available For Sale Matures Within One Year Gross Unrealized Loss

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Available for sale securities debt maturities rolling year two through three amortized cost basis.

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Available for sale securities debt maturities rolling year two through three fair value.

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

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

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This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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