The Company and Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2016 USD ($) Segment Party Customer	Dec. 31, 2015 USD ($) Customer	Dec. 31, 2014 USD ($) Customer	Feb. 23, 2017 USD ($)	Dec. 31, 2013
Revenue, Major Customer [Line Items]
Non - controlling interest of minority owners					19.00%
Number of operating segments | Segment	1
Number of third party | Party	1
Net derivative loss included in AOCI to be reclassified into earnings	$ 600,000
Security deposit as non-current assets	1,884,000	$ 1,665,000
Impairment of goodwill	$ 0
Estimated useful life	7 years
Weighted average useful lives of acquired technology intangible assets	5 years 6 months
Period to complete Professional service arrangements	90 days
Warranty period	60 days
Employer contributions to the 401(k) retirement savings plan	$ 0	0	$ 0
Salary in calculation for severance pay by severance pay law	1 month
Severance expense for employees in Israel	$ 1,600,000	$ 1,300,000	$ 1,400,000
Credit Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Number of customers representing 18% or more of gross accounts receivable | Customer	1
Number of customers representing 21% or more of gross accounts receivable | Customer		1
Revenue [Member] | Customer Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Minimum percentage of revenue or gross accounts receivable balance required to be significant customers	13.00%	18.00%
Number of customers representing 10% or more of revenue | Customer	1	1	0
Accounts Receivable | Credit Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Minimum percentage of revenue or gross accounts receivable balance required to be significant customers	18.00%	21.00%
Minimum [Member]
Revenue, Major Customer [Line Items]
Estimated useful lives	2 years
Estimated useful life	7 years
Standard payment terms to customers range	30 days
Term of maintenance and support and subscription contracts	1 year
Maximum [Member]
Revenue, Major Customer [Line Items]
Estimated useful lives	7 years
Estimated useful life	10 years
Standard payment terms to customers range	90 days
Term of maintenance and support and subscription contracts	3 years
Subsequent Event [Member] | Skyfence Cloud Access Security Broker Business [Member]
Revenue, Major Customer [Line Items]
Business disposal consideration				$ 40,000,000