Quarterly report pursuant to Section 13 or 15(d)

Stock Incentive Plan - Additional Information (Detail)

v3.21.2
Stock Incentive Plan - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee service share-based compensation, nonvested awards, compensation not yet recognized, stock options $ 22,000 $ 22,000  
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition   2 years 3 months 18 days  
Expected term of award 8 years 7 years 9 months 18 days 7 years 7 months 6 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 8,000,000  
Share price $ 3.71 $ 3.71  
Share-based compensation arrangement by share-based payment award, options, vested in period, fair value   $ 300 $ 400
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