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Business Combination - Purchase Price Allocation (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Feb. 16, 2012 VCON Video Conferencing, Ltd. (VCON) [Member]
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Inventory			$ 320
Property and equipment			34
Product warranty liability			(8)
Tradename			500
Patents and technology			2,300
Proprietary software			500
In-process research and development			200
Goodwill	1,939	1,153	786
Fair value of identified assets and liabilities acquired and goodwill			$ 4,632

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Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed In Process Research And Development

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Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Patents And Technology

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Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Product Warranty Liability

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Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Proprietary Software

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Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Tradename

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The total purchase price of the acquired entity. This includes cash paid to equity interest holders of the acquired entity, fair value of debt and equity securities issued to equity holders of the acquired entity, and transaction costs paid to third parties to consummate the acquisition.

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The amount of inventory recognized as of the acquisition date.

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The amount of property, plant, and equipment recognized as of the acquisition date.

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Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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