Acquisitions - Summary of Allocation of Consideration to Fair Value of Tangible and Intangible Assets Acquired and Liabilities Assumed (Detail) (USD $)				0 Months Ended		0 Months Ended
	Sep. 30, 2014	Dec. 31, 2013		Jan. 30, 2014 Tomium Software, LLC. [Member]	Jan. 30, 2014 Tomium Software, LLC. [Member]	Feb. 07, 2014 Skyfence Networks Ltd. [Member]	Feb. 07, 2014 Skyfence Networks Ltd. [Member]	Feb. 07, 2014 Skyfence Networks Ltd. [Member] Existing Technology [Member]
Business Acquisition [Line Items]
Intangible assets					$ 2,704,000			$ 7,965,000
Goodwill	34,972,000	0	[1]		5,499,000		29,473,000
Total intangible assets acquired					8,203,000
Other acquired tangible assets					60,000
Total purchase price				8,263,000		36,924,000
Net tangible assets							1,014,000
Deferred tax liability assumed							$ (1,528,000)

[1] The Condensed Consolidated Balance Sheet as of December 31, 2013 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.