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Equity Plans and Stock-Based Compensation - Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
May. 31, 2014
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Options vesting period       4 years  
Expiration period       10 years  
Stock-based compensation expense   $ 2,630 $ 1,586 $ 6,502 $ 4,532
2004 Employee Stock Purchase Plan          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Shares reserved and approved for issuance   99,600   99,600  
Shares issued to employees       94,709  
Shares remaining available for future purchases   0   0  
2014 Employee Stock Purchase Plan          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Shares issued to employees 50,000     21,979  
Shares remaining available for future purchases   28,021   28,021  
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%        
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   $ 20,200   $ 20,200  
Total unrecognized compensation cost, weighted-average vesting period       2 years 10 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   2,600   $ 2,600  
Restricted Stock Units (RSUs)          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Aggregate intrinsic value   $ 4,700   $ 4,700  
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   75,000   75,000