Post-effective amendment to a registration statement that is not immediately effective upon filing

Share-based Compensation - Additional Information (Detail)

v3.21.2
Share-based Compensation - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2021
Sep. 30, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost $ 19,000,000     $ 19,000,000
Share-based compensation expense 818,000      
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized stock-based compensation expense, weighted-average recognition period     3 years 7 months 2 days  
Unrecognized compensation cost   $ 26,438,000 $ 26,438,000  
Share-based compensation expense   3,668,000 $ 6,785,000  
Market Condition Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized stock-based compensation expense, weighted-average recognition period     1 year 6 months 3 days 2 years 11 months 15 days
Unrecognized compensation cost 927,000 2,372,000 $ 2,372,000 $ 927,000
Share-based compensation expense $ 33,000 374,000 1,772,000 $ 33,000
Additional share based compensation expense   54,000 54,000  
Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense   $ 2,896,000 $ 4,090,000