Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation and Employee Benefit Plans - Stock-Based Compensation (Detail)

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Stock-Based Compensation and Employee Benefit Plans - Stock-Based Compensation (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Stock based compensation $ 4,794 $ 3,685 $ 8,513 $ 7,078
Cost of net revenue [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Stock based compensation 61 32 96 61
Research and development [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Stock based compensation 3,053 2,384 5,393 4,578
Selling, general and administrative [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Stock based compensation $ 1,680 $ 1,269 $ 3,024 $ 2,439