Summary of Available-for-Sale Marketable Securities (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale marketable securities, Amortized Cost Basis	$ 22,771	$ 23,274
Available-for-sale marketable securities, Gross Unrealized Gains	60	6
Available-for-sale marketable securities, Gross Unrealized Losses	(19)	(54)
Marketable securities	22,812	23,226
Corporate bonds
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale marketable securities, Amortized Cost Basis	21,503	21,748
Available-for-sale marketable securities, Gross Unrealized Gains	60	6
Available-for-sale marketable securities, Gross Unrealized Losses	(17)	(50)
Marketable securities	21,546	21,704
Mortgage-backed and asset-backed securities
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale marketable securities, Amortized Cost Basis	968	1,226
Available-for-sale marketable securities, Gross Unrealized Losses	(2)	(3)
Marketable securities	966	1,223
Agency bonds
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale marketable securities, Amortized Cost Basis	300	300
Available-for-sale marketable securities, Gross Unrealized Losses		(1)
Marketable securities	$ 300	$ 299

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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-Publisher FASB

-Name Accounting Standards Codification

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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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Amount of investments in debt securities classified as available-for-sale, expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer.

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