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Stock-Based Compensation - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 04, 2020
Jun. 04, 2019
Jun. 30, 2020
Apr. 30, 2020
Feb. 29, 2020
Dec. 31, 2019
May 31, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2015
Jan. 01, 2020
Nov. 20, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Common stock, par value     $ 0.001     $ 0.001     $ 0.001   $ 0.001        
Compensation expense                 $ 2,812,000 $ 2,681,000 $ 5,491,000 $ 4,915,000      
Common stock, shares outstanding     46,864,405     46,720,225     46,864,405   46,864,405        
Common stock, shares issued     46,864,405     46,720,225     46,864,405   46,864,405        
Fair value of options granted                 $ 10.23 $ 13.07 $ 10.53 $ 11.28      
Research and Development [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Compensation expense                 $ 1,670,000 $ 1,326,000 $ 3,279,000 $ 2,408,000      
General and Administrative [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Compensation expense                 1,142,000 1,355,000 2,212,000 2,507,000      
Restricted Stock Units [Member] | March 2019 [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Restricted stock units, vested               0              
Restricted Stock Units [Member] | Research and Development [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Compensation expense                 1,133,000 604,000 1,147,000 604,000      
Restricted Stock Units [Member] | General and Administrative [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Compensation expense                 551,000 590,000 581,000 590,000      
Director [Member] | Restricted Stock Units [Member] | General and Administrative [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Compensation expense                 $ 122,000 $ 41,000 $ 245,000 $ 41,000      
Executive Officers [Member] | Share-based Payment Arrangement, Employee [Member] | Restricted Stock Units [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Unvested restricted stock units     236,000           236,000   236,000        
Consultants [Member] | Share-based Payment Arrangement, Nonemployee [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                             $ 0.001
Options granted                 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           6,086,907               7,488,513  
Options granted                 147,000 241,000 820,350 1,198,000      
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, Employee [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                       $ 41,000      
2014 Equity Incentive Plan [Member] | Director [Member] | Share-based Payment Arrangement, Nonemployee [Member] | Restricted Stock Units [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Restricted stock units, approved and granted                     36,000        
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                        
Restricted stock units, approved and granted     36,000               36,000        
Restricted stock units, grant date fair value $ 15.62                            
Restricted stock units vesting date Jun. 04, 2021                            
Restricted stock units, vested                     0        
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        
Restricted stock units, approved and granted   24,000                          
Restricted stock units, grant date fair value   $ 20.47                          
Restricted stock units, vested                     24,000        
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                 $ 40,000   $ 40,000        
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                 82,000   205,000        
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]                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Common stock, shares issued     30,000 65,834                      
Compensation expense                 $ 1,543,000 $ 1,194,000 $ 1,543,000 1,194,000      
Restricted stock units, vested     30,000 65,834   36,666 74,166                
Unvested restricted stock units     0           0   0        
Restricted stock units, Forfeited           8,334                  
2014 Equity Incentive Plan [Member] | Executive Officers [Member] | Restricted Stock Units [Member] | February 2020 [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Restricted stock units, approved and granted         138,000                    
Restricted stock units, grant date fair value         $ 16.36                    
Compensation expense                 $ 0   $ 0        
2014 Equity Incentive Plan [Member] | Executive Officers [Member] | Restricted Stock Units [Member] | March 2019 [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Restricted stock units, approved and granted               215,000              
Restricted stock units, grant date fair value               $ 16.10              
2014 Equity Incentive Plan [Member] | Executive Officers [Member] | Restricted Stock Units [Member] | Research and Development [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Compensation expense                 1,087,000 604,000 1,087,000 604,000      
2014 Equity Incentive Plan [Member] | Executive Officers [Member] | Restricted Stock Units [Member] | General and Administrative [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Compensation expense                 456,000 $ 590,000 456,000 $ 590,000      
2014 Equity Incentive Plan [Member] | Executive Officers [Member] | Time-based Restricted Stock Units [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Vesting period of awards granted         3 years                    
Restricted stock units, approved and granted         98,000                    
Restricted stock units, grant date fair value         $ 16.36                    
Compensation expense                 142,000   $ 186,000        
Restricted stock units, vested                     0        
2014 Equity Incentive Plan [Member] | Executive Officers [Member] | Time-based Restricted Stock Units [Member] | Research and Development [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Compensation expense                 47,000   $ 61,000        
2014 Equity Incentive Plan [Member] | Executive Officers [Member] | Time-based Restricted Stock Units [Member] | General and Administrative [Member]                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Compensation expense                 $ 95,000   $ 125,000        
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