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Share-Based Compensation - Summary of Share-Based Compensation Awards (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Amounts for share-based compensation expense $ 762 $ 940 $ 1,239 $ 1,889
Cost of net revenues [Member]
       
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Amounts for share-based compensation expense 11 80 (19) 56
Research and development [Member]
       
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Amounts for share-based compensation expense 210 288 257 579
Sales and marketing [Member]
       
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Amounts for share-based compensation expense 143 199 222 403
General and administrative [Member]
       
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Amounts for share-based compensation expense $ 398 $ 373 $ 779 $ 851