v3.23.2
Stock-Based Compensation - Additional Information (Detail)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 15, 2023
shares
Jun. 01, 2023
$ / shares
shares
Mar. 01, 2023
$ / shares
shares
Oct. 12, 2022
$ / shares
shares
Jun. 15, 2022
$ / shares
shares
Jun. 02, 2022
$ / shares
shares
Mar. 31, 2022
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. 30, 2023
$ / shares
shares
Apr. 30, 2023
shares
Feb. 28, 2023
shares
Jan. 31, 2023
shares
Dec. 31, 2022
$ / shares
shares
Oct. 31, 2022
shares
Jun. 30, 2022
shares
Mar. 31, 2022
shares
Feb. 28, 2022
shares
Feb. 29, 2020
installment
$ / shares
shares
Jun. 30, 2023
USD ($)
$ / shares
shares
Mar. 31, 2023
shares
Jun. 30, 2022
USD ($)
$ / shares
shares
Mar. 31, 2022
shares
Jun. 30, 2023
USD ($)
$ / shares
shares
Jun. 30, 2022
USD ($)
$ / shares
shares
Dec. 31, 2015
shares
Jan. 01, 2023
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       $ 0.001        
Common stock, shares outstanding                         54,068,806       53,797,341           54,068,806       54,068,806        
Common stock, shares issued                         54,068,806       53,797,341           54,068,806       54,068,806        
Number of restricted stock units outstanding                         791,853           648,450       791,853   648,450   791,853 648,450      
Number of options outstanding                         8,134,597       7,689,449   7,419,027       8,134,597   7,419,027   8,134,597 7,419,027      
Options granted                                                     1,798,921        
Common Stock                                                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Restricted stock units vested shares                                             94,454 83,793 89,075 109,943          
Board of Directors Chairman [Member] | Restricted Stock Units [Member] | June 2022 | Common Stock                                                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Restricted stock units vested shares                                     11,876                        
Employees [Member] | Restricted Stock Units [Member] | Research and Development [Member]                                                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Compensation expense | $                                             $ 116,000   $ 198,000   $ 295,000 $ 365,000      
Employees [Member] | Restricted Stock Units [Member] | General and Administrative [Member]                                                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Compensation expense | $                                             310,000   517,000   639,000 1,969,000      
Director [Member] | Restricted Stock Units [Member] | General and Administrative [Member]                                                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Compensation expense | $                                             $ 135,000   $ 238,000   $ 258,000 $ 377,000      
Director [Member] | Time-based Restricted Stock Units [Member] | June 2022 | Common Stock                                                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Vesting period of awards granted                         1 year           1 year                        
Restricted stock units vested shares                         59,380           43,200                        
Executive Officers [Member] | Time-based Restricted Stock Units [Member] | February 2022 | Common Stock                                                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Vesting period of awards granted                             3 years           3 years                    
Restricted stock units vested shares                             42,920           32,666                    
Executive Officers [Member] | Time-based Restricted Stock Units [Member] | December 2021 | Common Stock                                                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Restricted stock units vested shares                         26,199                                    
Executive Officers [Member] | Time-based Restricted Stock Units [Member] | October 2021 | Common Stock                                                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Restricted stock units vested shares                           8,875   8,875                              
Executive Officers [Member] | Time-based Restricted Stock Units [Member] | March 2021 | Common Stock                                                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Vesting period of awards granted                                               3 years              
Restricted stock units vested shares                                               15,999              
Executive Officers [Member] | Time-based Restricted Stock Units [Member] | February 2020 | Common Stock                                                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Vesting period of awards granted                             3 years                                
Restricted stock units vested shares                             15,999                                
Non-employee Consultants [Member]                                                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Options granted                                             0   0   0 0      
Employees And Non-Employee Members Of Board Of Directors [Member] | Share-based Payment Arrangement, Employee [Member]                                                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Fair value of options granted | $ / shares                                             $ 2.43   $ 6.30   $ 6.18 $ 7.23      
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                                                             300,000,000
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                                 10,589,103                         12,203,023  
Options granted                                             349,767   324,981   1,798,921 1,302,419      
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                                                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Compensation expense | $                                                 $ 100,000     $ 100,000      
2014 Equity Incentive Plan [Member] | Employees [Member] | Performance Restricted Stock Units [Member] | February 2022                                                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Awarded               243,000                                              
Restricted stock units, grant date fair value | $ / shares               $ 10.46                                              
Compensation expense | $                                             $ 0   0   $ 0 0      
Number of restricted stock units outstanding                         0                   0       0        
2014 Equity Incentive Plan [Member] | Employees [Member] | Performance Restricted Stock Units [Member] | March 2021                                                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Awarded                       176,000                                      
Restricted stock units, grant date fair value | $ / shares                       $ 20.59                                      
Compensation expense | $                                             $ 0       $ 0        
Restricted stock units, vested                                         37,999                    
Restricted stock units, forfeited due to performance targets not getting met                                       93,999                      
Number of restricted stock units outstanding                         0                   0       0        
2014 Equity Incentive Plan [Member] | Employees [Member] | Performance Restricted Stock Units [Member] | March 2023                                                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Awarded     407,000                                                        
Restricted stock units, grant date fair value | $ / shares     $ 10.06                                                        
Compensation expense | $                                             $ 0       $ 0        
Number of restricted stock units outstanding                         407,000                   407,000       407,000        
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 | $                                                       303,000      
2014 Equity Incentive Plan [Member] | Employees [Member] | Performance Restricted Stock Units [Member] | General and Administrative [Member] | March 2021                                                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Compensation expense | $                                                       729,000      
2014 Equity Incentive Plan [Member] | Employees [Member] | Time-based Restricted Stock Units [Member] | February 2022                                                              
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 | $                                             $ 85,000   108,000   $ 199,000 158,000      
Restricted stock units, vested                             42,920                                
Number of restricted stock units outstanding                         78,665                   78,665       78,665        
2014 Equity Incentive Plan [Member] | Employees [Member] | Time-based Restricted Stock Units [Member] | December 2021                                                              
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 | $                                             $ 91,000   82,000   $ 199,000 213,000      
Restricted stock units, vested 26,199                                                   0        
2014 Equity Incentive Plan [Member] | Employees [Member] | Time-based Restricted Stock Units [Member] | March 2021                                                              
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 | $                                             82,000   196,000   $ 163,000 480,000      
Restricted stock units, vested                                     17,333 33,336             15,999        
Restricted stock units, Forfeited                                     17,333                        
2014 Equity Incentive Plan [Member] | Employees [Member] | Time-based Restricted Stock Units [Member] | February 2020                                                              
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 | $                                             0   175,000   $ 39,000 394,000      
Restricted stock units, vested                                         32,666           0        
2014 Equity Incentive Plan [Member] | Employees [Member] | Time-based Restricted Stock Units [Member] | Research and Development [Member] | February 2022                                                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Compensation expense | $                                             17,000   47,000   $ 64,000 65,000      
2014 Equity Incentive Plan [Member] | Employees [Member] | Time-based Restricted Stock Units [Member] | Research and Development [Member] | December 2021                                                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Compensation expense | $                                             44,000   52,000   96,000 104,000      
2014 Equity Incentive Plan [Member] | Employees [Member] | Time-based Restricted Stock Units [Member] | Research and Development [Member] | March 2021                                                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Compensation expense | $                                             55,000   55,000   109,000 109,000      
2014 Equity Incentive Plan [Member] | Employees [Member] | Time-based Restricted Stock Units [Member] | Research and Development [Member] | February 2020                                                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Compensation expense | $                                                 44,000   26,000 87,000      
2014 Equity Incentive Plan [Member] | Employees [Member] | Time-based Restricted Stock Units [Member] | General and Administrative [Member]                                                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Compensation expense | $                                                 131,000            
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 | $                                                 109,000     264,000      
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 | $                                                 114,000     317,000      
2014 Equity Incentive Plan [Member] | Employees [Member] | Time-based Restricted Stock Units [Member] | General and Administrative [Member] | February 2022                                                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Compensation expense | $                                             68,000   61,000   135,000 93,000      
2014 Equity Incentive Plan [Member] | Employees [Member] | Time-based Restricted Stock Units [Member] | General and Administrative [Member] | December 2021                                                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Compensation expense | $                                             47,000   30,000   103,000 109,000      
2014 Equity Incentive Plan [Member] | Employees [Member] | Time-based Restricted Stock Units [Member] | General and Administrative [Member] | March 2021                                                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Compensation expense | $                                             $ 27,000   141,000   54,000 371,000      
2014 Equity Incentive Plan [Member] | Employees [Member] | Time-based Restricted Stock Units [Member] | General and Administrative [Member] | February 2020                                                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Compensation expense | $                                                     $ 13,000 307,000      
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] | Executive Officers [Member] | Time-based Restricted Stock Units [Member] | October 2022                                                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Awarded       7,267                                                      
Restricted stock units, grant date fair value | $ / shares       $ 9.42                                                      
Number of restricted stock units outstanding                         7,267                   7,267       7,267        
2014 Equity Incentive Plan [Member] | Executive Officers [Member] | Time-based Restricted Stock Units [Member] | March 2021                                                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Restricted stock units, vested                                                     15,999        
2014 Equity Incentive Plan [Member] | Executive Officers [Member] | Time-based Restricted Stock Units [Member] | February 2020                                                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Restricted stock units, vested                             15,999                                
2014 Equity Incentive Plan [Member] | Executive Officers [Member] | Time-based Restricted Stock Units [Member] | General and Administrative [Member] | October 2022                                                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Compensation expense | $                                             $ 19,000       $ 38        
2014 Equity Incentive Plan [Member] | Chief Financial Officer [Member] | Time-based Restricted Stock Units [Member] | June 2022                                                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Awarded         7,500                                                    
Restricted stock units, grant date fair value | $ / shares         $ 7.94                                                    
Compensation expense | $                                                 $ 5,000     5,000      
Restricted stock units, vested                                                     0        
2014 Equity Incentive Plan [Member] | Former Chief Financial Officer [Member] | Performance Restricted Stock Units [Member] | February 2022                                                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Restricted stock units, Forfeited                                     29,000                        
Restricted stock units, forfeited due to resignation of former CFO                                                 20,000            
Restricted stock units, cancelled                                 214,000                            
2014 Equity Incentive Plan [Member] | Former Chief Financial Officer [Member] | Time-based Restricted Stock Units [Member] | December 2021                                                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Restricted stock units, forfeited due to resignation of former CFO                                     11,170                        
2014 Equity Incentive Plan [Member] | Chief Executive Officer [Member] | Time-based Restricted Stock Units [Member] | October 2021                                                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Awarded                   147,942                                          
Restricted stock units, grant date fair value | $ / shares                   $ 16.83                                          
Number of restricted stock unit tranches | tranche                   2                                          
Restricted stock units, vested                           8,875   8,875   35,500                          
Number of restricted stock units outstanding                         88,750                   88,750       88,750        
2014 Equity Incentive Plan [Member] | Chief Executive Officer [Member] | Time-based Restricted Stock Units [Member] | General and Administrative [Member] | October 2021                                                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Compensation expense | $                                             $ 149,000   $ 149,000   $ 296,000 355,000      
2014 Equity Incentive Plan [Member] | Chief Executive Officer [Member] | Share-Based Compensation Award, Tranche One [Member] | Time-based Restricted Stock Units [Member] | October 2021                                                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Percentage of vested shares on first anniversary of grant date                   25.00%                                          
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                                                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Vesting period of awards granted                   36 months                                          
Restricted stock units, vested             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                                                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Vesting period of awards granted           1 year                                                  
Awarded           59,380                                                  
Restricted stock units, grant date fair value | $ / shares           $ 8.42                                                  
Number of restricted stock units outstanding                         0                   0       0        
2014 Equity Incentive Plan [Member] | Non-employee Directors [Member] | Restricted Stock Units [Member] | June 2021                                                              
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                                        
Number of restricted stock units outstanding                         0                   0       0        
2014 Equity Incentive Plan [Member] | Non-employee Directors [Member] | Restricted Stock Units [Member] | June 2023                                                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Vesting period of awards granted   1 year                                                          
Awarded   194,172                                                          
Restricted stock units, grant date fair value | $ / shares   $ 3.09                                                          
Number of restricted stock units outstanding                         194,172                   194,172       194,172        
2014 Equity Incentive Plan [Member] | Non-employee Directors [Member] | Restricted Stock Units [Member] | General and Administrative [Member] | June 2022                                                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Compensation expense | $                                             $ 86,000   38,000   $ 209,000 38,000      
2014 Equity Incentive Plan [Member] | Non-employee Directors [Member] | Restricted Stock Units [Member] | General and Administrative [Member] | June 2021                                                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Compensation expense | $                                                 $ 100,000     $ 239,000      
2014 Equity Incentive Plan [Member] | Non-employee Directors [Member] | Restricted Stock Units [Member] | General and Administrative [Member] | June 2023                                                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                              
Compensation expense | $                                             $ 49,000       $ 49,000        
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                                                     601,172        
Restricted stock units, grant date fair value | $ / shares                                                     $ 7.81        
Restricted stock units, vested                                                     178,247        
Restricted stock units, Forfeited                                                     3,585        
Number of restricted stock units outstanding                         791,853       372,513           791,853       791,853