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
6 Months Ended
Jun. 30, 2020
Jun. 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 $ 52,000.0    
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition 1 year 10 months 24 days    
Expected term of award 7 years 7 months 6 days 7 years 6 months  
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 $ 1.13    
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