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Stock-Based Compensation - Additional Information (Detail) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Jan. 01, 2015
Dec. 31, 2014
Employees and Members of Board of Directors [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Fair value of options granted $ 13.30 $ 8.01 $ 6.60 $ 7.58    
Nonemployee Consultants [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Weighted average fair value of outstanding unvested options $ 10.87 $ 5.87 $ 9.03 $ 11.79    
2014 Equity Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of stock options that may be granted after the tenth anniversary of the 2014 Plan     0      
Annual increases in number of shares reserved for issuance as a percentage of shares of capital stock outstanding through January 1, 2024     3.00%      
Share-based compensation arrangement by share-based payment award, number of shares authorized         2,284,061 1,600,000
Options granted 25,000 40,000 629,000 654,000    
2014 Equity Incentive Plan [Member] | Share-Based Compensation Award, Tranche One [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Percentage of vested shares on first anniversary of grant date     25.00%      
2014 Equity Incentive Plan [Member] | Share-based Compensation Award, Tranche Two [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period of awards granted     36 months      
2014 Equity Incentive Plan [Member] | Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Term of awards granted     10 years      
2014 Equity Incentive Plan [Member] | Incentive Stock Options [Member] | Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation arrangement by share-based payment award, number of shares authorized 30,000,000   30,000,000