Information Regarding Marketable Securities (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Marketable securities, fair value	$ 1,626us-gaap_AvailableForSaleSecurities	$ 4,278us-gaap_AvailableForSaleSecurities
Marketable securities, at cost	1,626	4,277
Marketable securities, fair value	1,626us-gaap_AvailableForSaleSecurities	4,278us-gaap_AvailableForSaleSecurities
Marketable securities, fair value, within one year	1,620	4,277
Gross unrealized holding gains		1
Marketable securities, fair value, one to two years	0	0
Gross unrealized holding losses	0	0
Corporate obligations
Schedule of Available-for-sale Securities [Line Items]
Marketable securities, fair value	1,620	4,277
Marketable securities, at cost	1,620	4,276
Marketable securities, fair value	1,620	4,277
Gross unrealized holding gains		1
Gross unrealized holding losses	0	0
Corporate equities
Schedule of Available-for-sale Securities [Line Items]
Marketable securities, fair value	6	1
Marketable securities, at cost	6	1
Marketable securities, fair value	6	1
U.S. treasury and agency securities
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized holding losses	$ 0	$ 0

Available for Sale Securities, Debt Maturities, after One Through Two Years, Fair Value

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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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 unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.

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Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.

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