Business Combinations - Schedule of Estimated Useful Life and Fair Values of the Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	Feb. 01, 2016	Jan. 14, 2016
Invotas International Corporation
Business Acquisition [Line Items]
Intangible assets	$ 8,400
iSIGHT Security
Business Acquisition [Line Items]
Intangible assets		$ 82,800
In-process research and development | Invotas International Corporation
Business Acquisition [Line Items]
Intangible assets	$ 2,800
Customer relationships | Invotas International Corporation
Business Acquisition [Line Items]
Finite lived acquired assets, useful life	10 years
Intangible assets	$ 800
Customer relationships | iSIGHT Security
Business Acquisition [Line Items]
Finite lived acquired assets, useful life		8 years
Intangible assets		$ 32,600
Content | iSIGHT Security
Business Acquisition [Line Items]
Finite lived acquired assets, useful life		4 years
Intangible assets		$ 28,900
Developed technology | Invotas International Corporation
Business Acquisition [Line Items]
Finite lived acquired assets, useful life	4 years
Intangible assets	$ 4,500
Developed technology | iSIGHT Security
Business Acquisition [Line Items]
Intangible assets		$ 17,100
Developed technology | iSIGHT Security | Minimum
Business Acquisition [Line Items]
Finite lived acquired assets, useful life		4 years
Developed technology | iSIGHT Security | Maximum
Business Acquisition [Line Items]
Finite lived acquired assets, useful life		6 years
Trade name | iSIGHT Security
Business Acquisition [Line Items]
Finite lived acquired assets, useful life		5 years
Intangible assets		$ 3,100
Non-competition agreements | Invotas International Corporation
Business Acquisition [Line Items]
Finite lived acquired assets, useful life	3 years
Intangible assets	$ 300
Non-competition agreements | iSIGHT Security
Business Acquisition [Line Items]
Finite lived acquired assets, useful life		2 years
Intangible assets		$ 1,100