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Equity Plans and Stock-Based Compensation - Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2016
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock-based compensation expense   $ 3,124 $ 1,918 $ 6,368 $ 3,872
Restricted Stock Units (RSUs)          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Aggregate intrinsic value   $ 7,900   $ 7,900  
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   189,000   189,000  
Employee Stock Option          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Options vesting period       4 years  
Expiration period       10 years  
2011 Equity Incentive Plan          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Increase in the aggregate number of shares of common stock authorized for issuance 3,200,000        
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   $ 21,800   $ 21,800  
Total unrecognized compensation cost, weighted-average vesting period       2 years 7 months 6 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   $ 6,800   $ 6,800  
2014 Employee Stock Purchase Plan          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Increase in the aggregate number of shares of common stock authorized for issuance 200,000        
Shares issued to employees       40,670  
Shares remaining available for future purchases   209,330   209,330  
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%