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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 12 Months Ended 1 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Furniture and fixtures [Member]
Dec. 31, 2013
Internal Use Software [Member]
Dec. 31, 2013
Machinery and equipment [Member]
Dec. 31, 2013
Leasehold Improvements [Member]
Dec. 31, 2013
Forward Contracts [Member]
Minimum [Member]
Dec. 31, 2013
Forward Contracts [Member]
Maximum [Member]
Dec. 31, 2013
Software [Member]
Dec. 31, 2013
Software Development [Member]
Dec. 31, 2012
Software Development [Member]
Dec. 31, 2011
Software Development [Member]
Dec. 31, 2013
Accounts Receivable [Member]
Customer
Dec. 31, 2012
Accounts Receivable [Member]
Customer
Dec. 31, 2013
Customer Concentration Risk [Member]
Net Revenue [Member]
Comcast [Member]
Dec. 31, 2012
Customer Concentration Risk [Member]
Net Revenue [Member]
Comcast [Member]
Dec. 31, 2011
Customer Concentration Risk [Member]
Net Revenue [Member]
Comcast [Member]
Mar. 05, 2013
HFC business [Member]
Summary Of Significant Accounting Policies [Line Items]                                      
Gross proceeds from sale of cable access HFC business                                     $ 46,000,000
Recorded remeasurement losses for foreign currency exchange rate 500,000 700,000 700,000                                
Forward exchange contracts maturity term description These derivative instruments generally have maturities between one to three months.                                    
Derivative contract term               1 month 3 months                    
Cash and cash equivalents maximum maturity 3 months 3 months 3 months                                
Available-for-sale securities, maturity term 24 months                                    
Entity-wide revenue, major customer, accounts receivable percentage                           10.00% 10.00% 12.00% 11.00% 10.00%  
Number of significant customers for accounts receivable                           0 0        
Revenue recognition period, associated with service and maintenance agreement 1 year                                    
Percentage of revenue recognized upon completion contract method 100.00%                                    
Property, plant and equipment estimated useful life       5 years 3 years 4 years 10 years     3 years                  
Internal use software development cost capitalized                     1,400,000 800,000 1,100,000            
Property, plant and equipment leasehold improvements useful lives             shorter of the remaining useful lives of the assets, up to ten years, or the lease term of the respective assets                        
Goodwill, impairment loss 0                                    
Advertising expense $ 400,000 $ 500,000 $ 800,000                                
More Likely Than Not Threshold Recognition of Uncertain Tax Position 50.00%