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Equity Plans and Stock-Based Compensation - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
May 28, 2014
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock-based compensation expense   $ 3,661 $ 2,630 $ 10,030 $ 6,502
Time Based Vesting Schedule          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Total unrecognized compensation cost related to non-vested equity awards   24,400   $ 24,400  
Total unrecognized compensation cost, weighted-average vesting period       2 years 4 months 24 days  
Performance Based Vesting Schedule          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Total unrecognized compensation cost related to non-vested equity awards   $ 7,200   $ 7,200  
2014 Employee Stock Purchase Plan          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Shares issued to employees       45,547  
Shares remaining available for future purchases   182,474   182,474  
2014 Employee Stock Purchase Plan | The commencement of the offer period (generally, the sixteenth day in February or August)          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Purchase price per share as percentage of fair market value of common stock 85.00%        
2014 Employee Stock Purchase Plan | The exercise date, which is the last day of a purchase period (generally, the fifteenth day in February or August)          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Purchase price per share as percentage of fair market value of common stock 85.00%        
Restricted Stock Units (RSUs)          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Aggregate intrinsic value   $ 5,700   $ 5,700  
Performance based Vesting Condition          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Shares underlying stock options and restricted stock units awards with performance-based vesting criteria   200,000   200,000  
Employee Stock Option | Minimum          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Options vesting period       3 years  
Expiration period       7 years  
Employee Stock Option | Maximum          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Options vesting period       4 years  
Expiration period       10 years