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Business Combination Signal Demand (Details) - USD ($) $ in Thousands	Dec. 16, 2013	Jun. 30, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Goodwill		$ 20,614	$ 21,563
SignalDemand [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	$ 13,500
Goodwill	$ 7,175

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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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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