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Option Granted by Company (Detail) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of options granted 120,000 1,590,000 875,000
Exercise price $ 9.57 $ 13.02 $ 11.10
First 2015 Grant      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of options granted   110,000  
Vesting period   100% vest at date of grant  
Exercise price   $ 8.00  
Exercisable period, start date   Oct. 30, 2015  
Exercisable period, end date   Oct. 29, 2020  
Weighted remaining contractual life in months   10 months  
First 2016 Grant      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of options granted   280,000  
Vesting period   vest in January 2020  
Exercise price   $ 6.22  
Exercisable period, start date   Jan. 01, 2020  
Exercisable period, end date   Dec. 31, 2020  
Weighted remaining contractual life in months   12 months  
Second 2016 Grant      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of options granted   186,000  
Vesting period   vest in January 2020  
Exercise price   $ 5.41  
Exercisable period, start date   Jan. 01, 2020  
Exercisable period, end date   Dec. 31, 2020  
Weighted remaining contractual life in months   12 months  
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 2020  
Exercise price   $ 7.10  
Exercisable period, start date   Jan. 01, 2020  
Exercisable period, end date   Dec. 31, 2020  
Weighted remaining contractual life in months   12 months  
Second 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   24 months  
Third 2017 Grant      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of options granted   100,000  
Vesting period   vest in January 2020  
Exercise price   $ 7.95  
Exercisable period, start date   Jan. 01, 2020  
Exercisable period, end date   Dec. 31, 2020  
Weighted remaining contractual life in months   12 months  
Fourth 2017 Grant      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of options granted   100,000  
Vesting period   vest in January 2020  
Exercise price   $ 15.00  
Exercisable period, start date   Jan. 01, 2020  
Exercisable period, end date   Dec. 31, 2020  
Weighted remaining contractual life in months   12 months  
First 2018 Grant      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of options granted   30,000  
Vesting period   vest in January 2020  
Exercise price   $ 12.20  
Exercisable period, start date   Jan. 01, 2020  
Exercisable period, end date   Dec. 31, 2020  
Weighted remaining contractual life in months   12 months  
Second 2018 Grant      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of options granted   30,000  
Vesting period   vest in January 2020  
Exercise price   $ 10.55  
Exercisable period, start date   Jan. 01, 2020  
Exercisable period, end date   Dec. 31, 2020  
Weighted remaining contractual life in months   12 months  
First 2019 Grant      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of options granted   60,000  
Vesting period   vest in January 2020  
Exercise price   $ 9.57  
Exercisable period, start date   Jan. 01, 2020  
Exercisable period, end date   Dec. 31, 2020  
Weighted remaining contractual life in months   12 months