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Acquisition, Contingent Consideration by Acquisition (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Other Current Liabilities [Member]    
Business Acquisition, Contingent Consideration [Line Items]    
Contingent Consideration, Liability $ 2,775 $ 2,842
Other non current liabilities [Member]    
Business Acquisition, Contingent Consideration [Line Items]    
Contingent Consideration, Liability 2,130 1,948
Hyperspring, LLC [Member] | Other Current Liabilities [Member]    
Business Acquisition, Contingent Consideration [Line Items]    
Contingent Consideration, Liability 2,383 2,152
Hyperspring, LLC [Member] | Other non current liabilities [Member]    
Business Acquisition, Contingent Consideration [Line Items]    
Contingent Consideration, Liability 2,130 1,948
IntelliQlik, LLC [Member] | Other Current Liabilities [Member]    
Business Acquisition, Contingent Consideration [Line Items]    
Contingent Consideration, Liability 213 213
EnVision Systems, Inc. [Member] | Other Current Liabilities [Member]    
Business Acquisition, Contingent Consideration [Line Items]    
Contingent Consideration, Liability $ 179 $ 477