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Option Granted by Company (Detail) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of options granted 1,825,000 120,000 1,590,000
Exercise price $ 9.41 $ 9.57 $ 13.02
First 2017 Grant      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of options granted 15,000    
Vesting period vest in January 2021    
Exercise price $ 7.10    
Exercisable period, start date Jan. 01, 2021    
Exercisable period, end date Dec. 31, 2021    
Weighted remaining contractual life in months 12 months    
First 2020 Grant      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of options granted 153,500    
Vesting period vest in January 2021    
Exercise price $ 9.41    
Exercisable period, start date Jan. 01, 2021    
Exercisable period, end date Dec. 31, 2021    
Weighted remaining contractual life in months 12 months    
Second 2020 Grant      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of options granted 153,500    
Vesting period vest in January 2022    
Exercise price $ 9.41    
Exercisable period, start date Jan. 01, 2022    
Exercisable period, end date Dec. 31, 2022    
Weighted remaining contractual life in months 24 months    
Third 2020 Grant      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of options granted 153,000    
Vesting period vest in January 2023    
Exercise price $ 9.41    
Exercisable period, start date Jan. 01, 2023    
Exercisable period, end date Dec. 31, 2023    
Weighted remaining contractual life in months 36 months    
Fourth 2020 Grant      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of options granted 153,000    
Vesting period vest in January 2024    
Exercise price $ 9.41    
Exercisable period, start date Jan. 01, 2024    
Exercisable period, end date Dec. 31, 2024    
Weighted remaining contractual life in months 48 months