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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. 30, 2022
shares
Jun. 15, 2022
$ / shares
shares
Jun. 02, 2022
$ / shares
shares
Feb. 25, 2022
installment
$ / shares
shares
Dec. 17, 2021
installment
$ / shares
shares
Oct. 29, 2021
tranche
$ / shares
shares
Jun. 03, 2021
$ / shares
shares
Mar. 30, 2021
installment
$ / shares
shares
Jun. 04, 2020
$ / shares
Jun. 30, 2022
shares
Mar. 31, 2022
shares
Feb. 28, 2022
shares
Aug. 31, 2021
shares
Mar. 31, 2021
shares
Feb. 28, 2021
shares
Jun. 30, 2020
shares
Feb. 29, 2020
installment
$ / shares
shares
Sep. 30, 2022
USD ($)
$ / shares
shares
Mar. 31, 2022
shares
Sep. 30, 2021
USD ($)
$ / shares
shares
Sep. 30, 2022
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
$ / shares
shares
Dec. 31, 2015
shares
Jan. 01, 2022
shares
Dec. 31, 2021
$ / 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                                   53,733,607     53,733,607       53,480,812  
Common stock, shares issued                                   53,733,607     53,733,607       53,480,812  
Number of restricted stock units outstanding                                   640,950   365,029 640,950 365,029        
Number of options outstanding                                   7,654,523   5,974,549 7,654,523 5,974,549        
Restricted Stock Units [Member] | Research and Development [Member]                                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                    
Compensation expense | $                                   $ 200   $ 429 $ 565 $ 1,094        
Restricted Stock Units [Member] | General and Administrative [Member]                                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                    
Compensation expense | $                                   $ 381   $ 785 $ 2,350 $ 1,812        
Share-based Payment Arrangement, Employee [Member]                                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                    
Fair value of options granted | $ / shares                                   $ 7.37   $ 9.24 $ 7.27 $ 12.14        
Director [Member] | Restricted Stock Units [Member] | General and Administrative [Member]                                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                    
Compensation expense | $                                   $ 126   $ 142 $ 503 $ 423        
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 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                                               10,589,103 8,984,679  
Number of options outstanding                                   7,654,523     7,654,523       6,512,280  
Options granted                                   437,500   30,000 1,739,919 819,250        
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] | Board of Directors Chairman [Member] | Restricted Stock Units [Member] | General and Administrative [Member] | June 2022 [Member]                                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                    
Compensation expense | $                                         $ 100          
2014 Equity Incentive Plan [Member] | Board of Directors Chairman [Member] | Chief Executive Officer | Restricted Stock Units [Member] | June 2022 [Member]                                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                    
Awarded                   11,876                                
2014 Equity Incentive Plan [Member] | Employees [Member] | Restricted Stock Units [Member] | February 2022 [Member]                                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                    
Compensation expense | $                                   $ 0     $ 0          
2014 Equity Incentive Plan [Member] | Employees [Member] | Performance Restricted Stock Units [Member]                                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                    
Compensation expense | $                                       $ 906   $ 906        
2014 Equity Incentive Plan [Member] | Employees [Member] | Performance Restricted Stock Units [Member] | February 2022 [Member]                                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                    
Awarded       243,000                                            
Restricted stock units, grant date fair value | $ / shares       $ 10.46                                            
Restricted stock units, vested                                         0          
Number of restricted stock units outstanding                                   214,000     214,000          
2014 Equity Incentive Plan [Member] | Employees [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 | $                                         $ 729          
Restricted stock units, vested                       37,999 44,002               82,001          
Restricted stock units, Forfeited                                     93,999              
Number of restricted stock units outstanding                                   0     0          
2014 Equity Incentive Plan [Member] | Employees [Member] | Performance Restricted Stock Units [Member] | February 2020 [Member]                                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                    
Awarded                                 138,000                  
Restricted stock units, grant date fair value | $ / shares                                 $ 16.36                  
Compensation expense | $                                           1,256        
Restricted stock units, vested                           40,000 36,750           113,500          
Restricted stock units, Forfeited                                         24,500          
Number of restricted stock units outstanding                                   0     0          
2014 Equity Incentive Plan [Member] | Employees [Member] | Performance Restricted Stock Units [Member] | Research and Development [Member]                                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                    
Compensation expense | $                                       329   329        
2014 Equity Incentive Plan [Member] | Employees [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] | Employees [Member] | Performance Restricted Stock Units [Member] | General and Administrative [Member]                                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                    
Compensation expense | $                                       577   577        
2014 Equity Incentive Plan [Member] | Employees [Member] | Performance Restricted Stock Units [Member] | General and Administrative [Member] | Modified November 2021 Awards [Member]                                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                    
Compensation expense | $                                         $ 303          
2014 Equity Incentive Plan [Member] | Employees [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] | Employees [Member] | Time-based Restricted Stock Units [Member] | February 2022 [Member]                                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                    
Vesting period of awards granted       3 years                                            
Awarded       145,170                                            
Restricted stock units, grant date fair value | $ / shares       $ 10.46                                            
Number of equal installment | installment       3                                            
Compensation expense | $                                   $ 116     $ 274          
Restricted stock units, vested                                         0          
Restricted stock units, Forfeited                                   20,000                
Number of restricted stock units outstanding                                   125,170     125,170          
2014 Equity Incentive Plan [Member] | Employees [Member] | Time-based Restricted Stock Units [Member] | December 2021 [Member]                                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                    
Vesting period of awards granted         18 months                                          
Awarded         63,573                                          
Restricted stock units, grant date fair value | $ / shares         $ 12.45                                          
Number of equal installment | installment         2                                          
Compensation expense | $                                   $ 110     $ 323          
Restricted stock units, vested                                         0          
Restricted stock units, Forfeited                                   11,170                
Number of restricted stock units outstanding                                   52,403     52,403          
2014 Equity Incentive Plan [Member] | Employees [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                         100,000          
Restricted stock units, grant date fair value | $ / shares               $ 20.59                                    
Number of equal installment | installment               3                                    
Compensation expense | $                                   $ 83   173 $ 563 344        
Restricted stock units, vested 17,333                   33,336                   50,669          
Restricted stock units, Forfeited                                         17,333          
2014 Equity Incentive Plan [Member] | Employees [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                  
Restricted stock units, grant date fair value | $ / shares                                 $ 16.36                  
Number of equal installment | installment                                 3                  
Compensation expense | $                                   66   135 $ 460 400        
Restricted stock units, vested 16,666                     32,666     32,669           82,001          
2014 Equity Incentive Plan [Member] | Employees [Member] | Time-based Restricted Stock Units [Member] | Research and Development [Member] | February 2022 [Member]                                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                    
Compensation expense | $                                   48     $ 113          
2014 Equity Incentive Plan [Member] | Employees [Member] | Time-based Restricted Stock Units [Member] | Research and Development [Member] | December 2021 [Member]                                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                    
Compensation expense | $                                   53     157          
2014 Equity Incentive Plan [Member] | Employees [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   55 164 110        
2014 Equity Incentive Plan [Member] | Employees [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   44 131 130        
2014 Equity Incentive Plan [Member] | Employees [Member] | Time-based Restricted Stock Units [Member] | General and Administrative [Member] | Modified February 2020 Awards [Member]                                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                    
Compensation expense | $                                         264          
2014 Equity Incentive Plan [Member] | Employees [Member] | Time-based Restricted Stock Units [Member] | General and Administrative [Member] | Modified November 2021 Awards [Member]                                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                    
Compensation expense | $                                         317          
2014 Equity Incentive Plan [Member] | Employees [Member] | Time-based Restricted Stock Units [Member] | General and Administrative [Member] | February 2022 [Member]                                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                    
Compensation expense | $                                   68     161          
2014 Equity Incentive Plan [Member] | Employees [Member] | Time-based Restricted Stock Units [Member] | General and Administrative [Member] | December 2021 [Member]                                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                    
Compensation expense | $                                   57     166          
2014 Equity Incentive Plan [Member] | Employees [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 | $                                   28   118 399 234        
2014 Equity Incentive Plan [Member] | Employees [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 | $                                   $ 22   91 $ 329 270        
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] | 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] | Chief Financial Officer [Member] | Restricted Stock Units [Member] | February 2022 [Member]                                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                    
Restricted stock units, Forfeited                                   29,000                
2014 Equity Incentive Plan [Member] | Interim Principal Financial and Accounting Officer [Member] | Time-based Restricted Stock Units [Member] | June 2022 [Member]                                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                    
Awarded   7,500                                     7,500          
Restricted stock units, grant date fair value | $ / shares   $ 7.94                                                
Restricted stock units, vested                                         7,500          
2014 Equity Incentive Plan [Member] | Interim Principal Financial and Accounting Officer [Member] | Time-based Restricted Stock Units [Member] | General and Administrative [Member] | June 2022 [Member]                                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                    
Compensation expense | $                                   $ 55     $ 60          
2014 Equity Incentive Plan [Member] | Chief Executive Officer [Member] | Time-based Restricted Stock Units [Member] | October 2021 [Member]                                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                    
Awarded           147,942                             147,942          
Restricted stock units, grant date fair value | $ / shares           $ 16.83                                        
Number of restricted stock unit tranches | tranche           2                                        
Restricted stock units, vested                                         5,942          
2014 Equity Incentive Plan [Member] | Chief Executive Officer [Member] | Time-based Restricted Stock Units [Member] | General and Administrative [Member] | October 2021 [Member]                                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                    
Compensation expense | $                                   151     $ 506          
2014 Equity Incentive Plan [Member] | Chief Executive Officer [Member] | Share-Based Compensation Award, Tranche One [Member] | Time-based Restricted Stock Units [Member] | October 2021 [Member]                                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                    
Percentage of vested shares on first anniversary of grant date           25.00%                                        
Vesting period of awards granted           36 months                                        
Awarded           142,000                                        
2014 Equity Incentive Plan [Member] | Chief Executive Officer [Member] | Share-based Compensation Award, Tranche Two [Member] | Time-based Restricted Stock Units [Member] | October 2021 [Member]                                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                    
Awarded           5,942                                        
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 2022 [Member]                                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                    
Vesting period of awards granted     1 year                                              
Awarded     59,380                                   59,380          
Restricted stock units, grant date fair value | $ / shares     $ 8.42                                              
Restricted stock units, vested                                         0          
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                           43,200          
Restricted stock units, grant date fair value | $ / shares             $ 13.06                                      
Restricted stock units, vested                                         43,200          
2014 Equity Incentive Plan [Member] | Non-employee Directors [Member] | Restricted Stock Units [Member] | General and Administrative [Member] | June 2022 [Member]                                                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                    
Compensation expense | $                                   $ 126     $ 164          
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 $ 239 184        
2014 Equity Incentive Plan [Member] | Non-employee Directors [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 | $                                           $ 239        
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                                         466,926          
Restricted stock units, grant date fair value | $ / shares                                         $ 10.11          
Restricted stock units, vested                                         206,518          
Restricted stock units, Forfeited                                         196,002          
Number of restricted stock units outstanding                                   640,950     640,950       576,544