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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Intangible Assets (Details Textual) (USD $)	12 Months Ended
Intangible Assets (Details Textual) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	$ 1,600,000us-gaap_AmortizationOfIntangibleAssets	$ 1,400,000us-gaap_AmortizationOfIntangibleAssets	$ 800,000us-gaap_AmortizationOfIntangibleAssets
Impairment of technology	0	0	1,000,000
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	1 year
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	10 years
Research and Development Expense [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of technology			1,000,000
Discera, Inc. [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired		2,700,000
PhaseLink Acquisition [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired			8,300,000
Other Acquired Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired		$ 2,100,000