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Compensation of Key Management - Summary of Key Management Includes the Company's Officers and Vice Presidents (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of transactions between related parties [abstract]    
Salaries and other employee benefits $ 2,184 $ 1,778
Share-based payments 629 1,104
Key management personnel compensation $ 2,813 $ 2,882