Summary of Available-for-Sale Marketable Securities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale marketable securities, Amortized Cost Basis	$ 23,274	$ 19,968
Available-for-sale marketable securities, Gross Unrealized Gains	6	42
Available-for-sale marketable securities, Gross Unrealized Losses	(54)	(6)
Marketable securities	23,226	20,004
Corporate bonds
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale marketable securities, Amortized Cost Basis	21,748	18,798
Available-for-sale marketable securities, Gross Unrealized Gains	6	41
Available-for-sale marketable securities, Gross Unrealized Losses	(50)	(6)
Marketable securities	21,704	18,833
Mortgage-backed and asset-backed securities
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale marketable securities, Amortized Cost Basis	1,226	1,170
Available-for-sale marketable securities, Gross Unrealized Gains		1
Available-for-sale marketable securities, Gross Unrealized Losses	(3)
Marketable securities	1,223	1,171
Agency bonds
Schedule Of Available For Sale Securities [Line Items]
Available-for-sale marketable securities, Amortized Cost Basis	300
Available-for-sale marketable securities, Gross Unrealized Losses	(1)
Marketable securities	$ 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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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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