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Share-Based Compensation Plans - Additional Information (Detail) - shares
1 Months Ended 3 Months Ended
Apr. 30, 2015
Mar. 31, 2016
Mar. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Options exercised, Number of Shares   0 0
Restricted Stock Units [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Shares of common stock vested but unreleased   13,725  
2015 Equity Incentive Plan [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Authorized shares of common stock for issuance, Number of Shares 1,000,000    
Vesting period for stock options and restricted stock units 4 years    
Maximum contractual term for issuing new grants stock options and restricted stock units 10 years    
Shares available for issuance   2,683,289  
2015 Non Employee Directors' Stock Option Plan [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Authorized shares of common stock for issuance, Number of Shares 250,000    
Vesting period for stock options and restricted stock units 1 year    
Maximum contractual term for issuing new grants stock options and restricted stock units 10 years    
Shares available for issuance   410,000  
2015 Employee Stock Purchase Plan [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Authorized shares of common stock for issuance, Number of Shares 500,000    
Shares available for issuance under the ESPP 128,249 628,249  
Employees purchase common stock on their enrollment date 85.00%