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Equity Method Based Investees - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Share of earnings in associated company	$ (417,000)	$ (252,000)	$ (165,000)
Shares held, Percentage	81.20%
Frontline [Member]
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Investment in affiliates	4,683,000	5,223,000
Share of earnings in associated company	5,769,000	5,553,000	6,764,000
PixCell [Member]
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Investment in affiliates	2,987,000	3,154,000
Share of earnings in associated company	417,000	252,000	165,000
Shares held, Percentage	40.00%	37.60%
Additional shares from other shareholders	$ 250,000

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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