The Company and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014 Segment Parties	Dec. 31, 2013	Dec. 31, 2012
Revenue, Major Customer [Line Items]
Noncontrolling interest of minority owners		19.00%	15.00%
Number of operating segments	1
Number of third party	1
Net derivative loss included in AOCI to be reclassified into earnings	$ (1,002,000)
Security deposit as non-current assets	1,665,000	1,252,000
Impairment of goodwill	0	0	0
Weighted average useful lives of acquired technology intangible assets	7 years
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	$ 1,400,000	$ 1,200,000	$ 1,000,000
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	10.00%	10.00%	10.00%
Number of customers representing 10% or more of revenue	0	1	0
Gross Accounts Receivable [Member] | Credit Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Minimum percentage of revenue or gross accounts receivable balance required to be significant customers	10.00%	10.00%	10.00%
Number of customers representing 10% or more of gross accounts receivable	0	0
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