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Stock-Based Compensation - Additional Information (Detail)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 03, 2021
$ / shares
shares
Mar. 30, 2021
installment
$ / shares
shares
Jun. 04, 2020
$ / shares
Jun. 04, 2019
$ / shares
shares
Aug. 31, 2021
shares
Mar. 31, 2021
shares
Feb. 28, 2021
shares
Jun. 30, 2020
shares
Apr. 30, 2020
shares
Feb. 29, 2020
installment
$ / shares
shares
Mar. 31, 2019
$ / shares
shares
Sep. 30, 2021
USD ($)
$ / shares
shares
Mar. 31, 2021
shares
Sep. 30, 2020
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
$ / shares
shares
Sep. 30, 2020
USD ($)
$ / shares
shares
Dec. 31, 2015
shares
Jan. 01, 2021
shares
Dec. 31, 2020
$ / shares
shares
Nov. 20, 2019
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Common stock, par value | $ / shares                       $ 0.001     $ 0.001       $ 0.001  
Common stock, shares outstanding                       50,175,988     50,175,988       49,872,213  
Common stock, shares issued                       50,175,988     50,175,988       49,872,213  
Number of options outstanding                       5,974,549   5,265,642 5,974,549 5,265,642        
Restricted Stock Units [Member] | Research and Development [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Compensation expense | $                       $ 429   $ 44 $ 1,094 $ 1,192        
Restricted Stock Units [Member] | General and Administrative [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Compensation expense | $                       $ 785   $ 90 $ 1,812 $ 671        
Share-based Payment Arrangement, Employee [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Fair value of options granted | $ / shares                       $ 9.24   $ 11.11 $ 12.14 $ 10.70        
Director [Member] | Restricted Stock Units [Member] | General and Administrative [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Compensation expense | $                       $ 142   $ 142 $ 423 $ 387        
Non-employee Consultants [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Options granted                       0   0 0 0        
2019 Inducement Plan [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Common stock, par value | $ / shares                                       $ 0.001
Awarded                       0   0 0 0        
2019 Inducement Plan [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                                       300,000
2019 Inducement Plan [Member] | Share-based Payment Arrangement, Employee [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%          
2019 Inducement Plan [Member] | Share-based Payment Arrangement, Employee [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          
2019 Inducement Plan [Member] | Share-based Payment Arrangement, Employee [Member] | Share Based Compensation Subsequent Awards [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Vesting period of awards granted                             4 years          
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                                   8,984,679 7,488,513  
Number of options outstanding                       5,974,549     5,974,549       5,469,393  
Options granted                       30,000   345,000 819,250 1,165,350        
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] | Maximum [Member] | Incentive Stock Options [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      
2014 Equity Incentive Plan [Member] | Director [Member] | Incentive Stock Options [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Vesting period of awards granted                             3 years          
2014 Equity Incentive Plan [Member] | Director [Member] | Share-based Payment Arrangement, Nonemployee [Member] | General and Administrative [Member] | June 2019 [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Compensation expense | $                           $ 0            
2014 Equity Incentive Plan [Member] | Director [Member] | Share-based Payment Arrangement, Nonemployee [Member] | Restricted Stock Units [Member] | June 2020 [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Vesting period of awards granted               1 year                        
Awarded               36,000                        
Restricted stock units, grant date fair value | $ / shares     $ 15.62                                  
Restricted stock units vesting date     Jun. 03, 2021                                  
2014 Equity Incentive Plan [Member] | Director [Member] | Share-based Payment Arrangement, Nonemployee [Member] | Restricted Stock Units [Member] | June 2019 [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Vesting period of awards granted                             1 year          
Awarded       24,000                                
Restricted stock units, grant date fair value | $ / shares       $ 20.47                                
2014 Equity Incentive Plan [Member] | Director [Member] | Share-based Payment Arrangement, Nonemployee [Member] | Restricted Stock Units [Member] | General and Administrative [Member] | June 2021 [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Compensation expense | $                               $ 182        
2014 Equity Incentive Plan [Member] | Director [Member] | Share-based Payment Arrangement, Nonemployee [Member] | Restricted Stock Units [Member] | General and Administrative [Member] | June 2020 [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Compensation expense | $                       $ 0   142 $ 239          
2014 Equity Incentive Plan [Member] | Director [Member] | Share-based Payment Arrangement, Nonemployee [Member] | Restricted Stock Units [Member] | General and Administrative [Member] | June 2019 [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Compensation expense | $                               205        
2014 Equity Incentive Plan [Member] | Director [Member] | Share-based Payment Arrangement, Nonemployee [Member] | Minimum [Member] | Restricted Stock Units [Member] | June 2019 [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Restricted stock units vesting date     Jun. 04, 2020                                  
2014 Equity Incentive Plan [Member] | Executive Officers [Member] | Restricted Stock Units [Member] | Research and Development [Member] | March 2019 [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Compensation expense | $                           0            
2014 Equity Incentive Plan [Member] | Executive Officers [Member] | Performance Restricted Stock Units [Member] | March 2021 [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Awarded   176,000                         176,000          
Restricted stock units, grant date fair value | $ / shares   $ 20.59                                    
Compensation expense | $                       906     $ 906          
Restricted stock units, vested         44,002                   44,002          
2014 Equity Incentive Plan [Member] | Executive Officers [Member] | Performance Restricted Stock Units [Member] | February 2020 [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Awarded                   138,000         138,000          
Restricted stock units, grant date fair value | $ / shares                   $ 16.36                    
Compensation expense | $                       0   0 $ 1,256 0        
Restricted stock units, vested           40,000 36,750               113,500          
2014 Equity Incentive Plan [Member] | Executive Officers [Member] | Performance Restricted Stock Units [Member] | March 2019 [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Awarded                     215,000                  
Restricted stock units, grant date fair value | $ / shares                     $ 16.10                  
Compensation expense | $                               1,543        
Restricted stock units, vested               30,000 65,834                      
2014 Equity Incentive Plan [Member] | Executive Officers [Member] | Performance Restricted Stock Units [Member] | Research and Development [Member] | March 2021 [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Compensation expense | $                       329     $ 329          
2014 Equity Incentive Plan [Member] | Executive Officers [Member] | Performance Restricted Stock Units [Member] | Research and Development [Member] | February 2020 [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Compensation expense | $                             524          
2014 Equity Incentive Plan [Member] | Executive Officers [Member] | Performance Restricted Stock Units [Member] | Research and Development [Member] | March 2019 [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Compensation expense | $                               1,087        
2014 Equity Incentive Plan [Member] | Executive Officers [Member] | Performance Restricted Stock Units [Member] | General and Administrative [Member] | March 2021 [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Compensation expense | $                       577     577          
2014 Equity Incentive Plan [Member] | Executive Officers [Member] | Performance Restricted Stock Units [Member] | General and Administrative [Member] | February 2020 [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Compensation expense | $                             732          
2014 Equity Incentive Plan [Member] | Executive Officers [Member] | Performance Restricted Stock Units [Member] | General and Administrative [Member] | March 2019 [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Compensation expense | $                               456        
2014 Equity Incentive Plan [Member] | Executive Officers [Member] | Time-based Restricted Stock Units [Member] | March 2021 [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Vesting period of awards granted   3 years                                    
Awarded   100,000                                    
Restricted stock units, grant date fair value | $ / shares   $ 20.59                                    
Number of equal installment | installment   3                                    
Compensation expense | $                       173     $ 344          
Restricted stock units, vested                             0          
2014 Equity Incentive Plan [Member] | Executive Officers [Member] | Time-based Restricted Stock Units [Member] | February 2020 [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Vesting period of awards granted                   3 years                    
Awarded                   98,000         98,000          
Restricted stock units, grant date fair value | $ / shares                   $ 16.36                    
Number of equal installment | installment                   3                    
Compensation expense | $                       135   134 $ 400 320        
Restricted stock units, vested             32,669               32,669          
2014 Equity Incentive Plan [Member] | Executive Officers [Member] | Time-based Restricted Stock Units [Member] | Research and Development [Member] | March 2021 [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Compensation expense | $                       55     $ 110          
2014 Equity Incentive Plan [Member] | Executive Officers [Member] | Time-based Restricted Stock Units [Member] | Research and Development [Member] | February 2020 [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Compensation expense | $                       44   44 130 105        
2014 Equity Incentive Plan [Member] | Executive Officers [Member] | Time-based Restricted Stock Units [Member] | General and Administrative [Member] | March 2021 [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Compensation expense | $                       118     234          
2014 Equity Incentive Plan [Member] | Executive Officers [Member] | Time-based Restricted Stock Units [Member] | General and Administrative [Member] | February 2020 [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Compensation expense | $                       91   $ 90 $ 270 $ 215        
2014 Equity Incentive Plan [Member] | Employee And Nonemployee Consultants [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] | Employee And Nonemployee Consultants [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] | Employee And Nonemployee Consultants [Member] | Share Based Compensation Subsequent Awards [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Vesting period of awards granted                             4 years          
2014 Equity Incentive Plan [Member] | Non-employee Directors [Member] | Restricted Stock Units [Member] | June 2021 [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Vesting period of awards granted 1 year                                      
Awarded 43,200                                      
Restricted stock units, grant date fair value | $ / shares $ 13.06                                      
Restricted stock units, vested                             0          
2014 Equity Incentive Plan [Member] | Non-employee Directors [Member] | Restricted Stock Units [Member] | General and Administrative [Member] | June 2021 [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Compensation expense | $                       $ 142     $ 184          
2014 Equity Incentive Plan [Member] | Employees And Non-Employee Members Of Board Of Directors [Member] | Restricted Stock Units [Member]                                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Awarded                             319,200          
Restricted stock units, grant date fair value | $ / shares                             $ 19.57          
Restricted stock units, vested                             189,421