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Stock-Based Compensation - Additional Information (Detail) - 2015 Omnibus Equity Incentive Plan [Member]
3 Months Ended 9 Months Ended
Sep. 30, 2021
shares
Sep. 30, 2021
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares available for future grants 3,600,000 3,600,000
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock, granted 152,000 1,252,000
Incentive Stock Options [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Incentive stock options, exercisable 0 20,000