Acquisitions - Narrative (Details) - USD ($) $ in Thousands		1 Months Ended		3 Months Ended		6 Months Ended
	Oct. 26, 2016	Aug. 31, 2016	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Sep. 30, 2016
Business Acquisition [Line Items]
Goodwill			$ 23,438	$ 53,033		$ 53,033
Effective income tax rate (as a percent)				33.90%	34.70%	35.00%	34.80%
Mtelligence Corporation
Business Acquisition [Line Items]
Consideration transferred	$ 37,400
Cash paid	31,900
Future contingent consideration payment	5,500
Fair value of contingent consideration	$ 5,300
Goodwill				$ 28,160		$ 28,160
Weighted average discount rate (as a percent)						19.00%
Effective income tax rate (as a percent)						34.00%
Acquisition of Technology and Trademarks
Business Acquisition [Line Items]
Consideration transferred		$ 6,000
Cash paid		5,400
Future contingent consideration payment		$ 600
Goodwill								$ 2,000
Finite-lived intangible asset, useful life		6 years
Fidelis Group, LLC
Business Acquisition [Line Items]
Cash paid			8,000
Future contingent consideration payment			$ 2,000
Goodwill				6,706		$ 6,706
Developed Technology Rights | Mtelligence Corporation
Business Acquisition [Line Items]
Finite-lived intangible assets acquired				11,385		$ 11,385
Finite-lived intangible asset, useful life						12 years
Developed Technology Rights | Acquisition of Technology and Trademarks
Business Acquisition [Line Items]
Finite-lived intangible assets acquired								$ 4,000
Developed Technology Rights | Fidelis Group, LLC
Business Acquisition [Line Items]
Finite-lived intangible assets acquired				1,272		$ 1,272
In Process Research and Development | Fidelis Group, LLC
Business Acquisition [Line Items]
Finite-lived intangible assets acquired				3,097		3,097
Customer Relationship | Mtelligence Corporation
Business Acquisition [Line Items]
Finite-lived intangible assets acquired				679		$ 679
Finite-lived intangible asset, useful life						6 years
Customer Relationship | Fidelis Group, LLC
Business Acquisition [Line Items]
Finite-lived intangible assets acquired				753		$ 753
Non-compete Agreements | Mtelligence Corporation
Business Acquisition [Line Items]
Finite-lived intangible assets acquired				$ 553		$ 553
Finite-lived intangible asset, useful life						3 years