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Equity-Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized equity-based compensation expense related to restricted stock   $ 1.7   $ 1.7    
Potential dilutive securities excluded from computation of diluted net loss per common share   7,752,000 5,480,000 7,752,000 5,480,000  
Number of shares, cancelled       28,369    
Number of Shares, Granted       181,020    
Weighted Average Grant Date Fair Value per Share, Granted       $ 15.05    
Weighted average grant date fair value per share   $ 13.38 $ 9.66 $ 8.55 $ 9.21  
Total intrinsic value of stock options exercised   $ 0.9 $ 0.2 $ 1.7 $ 1.6  
Unrecognized compensation cost related to stock options   $ 35.5   $ 35.5    
Stock options outstanding   7,526,854   7,526,854   5,365,971
Vesting description       that vest upon obtaining certain scientific and regulatory milestones through 2020    
Performance-based options cancelled       430,998    
Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Weighted average period of unrecognized compensation costs       1 year 6 months    
Performance Based RSUs [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Potential dilutive securities excluded from computation of diluted net loss per common share       47,916    
Number of shares, cancelled   23,959        
RSUs [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Remaining vesting period 3 years          
Number of Shares, Granted 181,020          
Weighted Average Grant Date Fair Value per Share, Granted $ 15.05          
Stock Options [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Weighted average period of unrecognized compensation costs       2 years 7 months 6 days    
Performance Based Stock Options [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Potential dilutive securities excluded from computation of diluted net loss per common share       95,832    
Stock options outstanding   135,832   135,832    
Performance-based options cancelled       77,918    
2015 Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Remaining vesting period       3 years    
Description of stock options granted under the Plan       Stock options granted under the 2015 Plan generally vest 25% on the first anniversary of the original vesting date, with the balance vesting monthly over the remaining three years, unless they contain specific performance-based vesting provisions. The maximum term of stock options granted under the 2015 Plan is ten years.    
Shares available for future issuance   2,144,877   2,144,877    
Percentage of cumulative increase in number of shares for future issuance       4.00%    
2015 Plan [Member] | First Anniversary of Original Vesting Date [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vest percentage on the first anniversary       25.00%    
Maximum [Member] | 2015 Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Maximum term of stock options granted       10 years