Quarterly report pursuant to Section 13 or 15(d)

Stock Incentive Plan - Additional Information (Detail)

v3.20.2
Stock Incentive Plan - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
May 08, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Employee service share-based compensation, nonvested awards, compensation not yet recognized, stock options   $ 0.1    
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition   1 year 9 months 18 days    
Expected term of award 7 years 8 months 12 days 7 years 7 months 6 days 7 years 8 months 12 days  
Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected term of award   10 years    
Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected term of award   6 years    
Restricted Stock [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   5 years    
Restricted Stock [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   1 year    
Employee Stock Option [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       8,000,000
Share price   $ 0.92    
Share-based compensation arrangement by share-based payment award, options, vested in period, fair value   $ 0.4 $ 0.7  
Employee Stock Option [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   5 years    
Employee Stock Option [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   4 years