Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended				3 Months Ended	6 Months Ended
	Jun. 30, 2014 Customer	Jun. 30, 2013 Customer	Jun. 30, 2014 Customer Segment	Jun. 30, 2013 Customer	Dec. 31, 2013 Customer	Nov. 30, 2012 Patents	Mar. 31, 2013 License Agreements [Member]	Jun. 30, 2014 Minimum [Member]	Jun. 30, 2014 Maximum [Member]	Jun. 30, 2014 Weighted Average [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Marketable securities, maturities remaining			2 years
Marketable securities, amortized cost	$ 100,100,000		$ 100,100,000		$ 100,300,000
Marketable securities	100,170,000		100,170,000		100,299,000
Marketable securities, unrealized gains	59,000		59,000		67,000
Marketable securities, unrealized losses	10,000		10,000		28,000
Revenue subscription period								1 month	5 years	1 year
Accounts receivable, customers accounted description			10% or more of accounts receivable
Accounts receivable, number of customers accounted	1		1		0
Revenue, customers accounted description			10% or more of revenue
Revenue, number of customers accounted	0	0	0	0
Number of reporting unit			1
Goodwill impairments			0
Intangible assets, estimated useful lives								4 months	7 years
Long-lived asset impairment			0
Foreign currency gains	224,000		197,000	454,000
Foreign currency losses		199,000
Uncertain tax positions	484,000		484,000		304,000
Number of patents involved in infringement lawsuit						3
General and administrative expense	$ 7,448,000	$ 6,352,000	$ 14,125,000	$ 17,872,000			$ 1,200,000