Business Combination, Goodwill and Intangibles - Purchase Price Allocation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Feb. 16, 2012 VCON Video Conferencing, Ltd. (VCON)
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Inventory				$ 40
Property and equipment				34
Product warranty liability				(8)
Proprietary software				2,247
Goodwill	3,472	3,472	1,153	2,319
Total				4,632
Business acquisition, purchase price allocation, goodwill, expected tax deductible amount				0
Amortization of Intangible Assets	$ 548	$ 679

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Product Warranty Liability

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

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The amount of identifiable intangible assets recognized as of the acquisition date.

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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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Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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