Acquisition, Contingent Consideration by Acquisition (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Other Current Liabilities [Member]
Business Acquisition, Contingent Consideration [Line Items]
Contingent Consideration, Liability	$ 1,900	$ 2,842
Other non current liabilities [Member]
Business Acquisition, Contingent Consideration [Line Items]
Contingent Consideration, Liability	2,492	1,948
Hyperspring, LLC [Member] | Other Current Liabilities [Member]
Business Acquisition, Contingent Consideration [Line Items]
Contingent Consideration, Liability	1,516	2,152
Hyperspring, LLC [Member] | Other non current liabilities [Member]
Business Acquisition, Contingent Consideration [Line Items]
Contingent Consideration, Liability	2,492	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	$ 171	$ 477