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Related Party Transactions - Summary of Key Management Compensation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Transactions Between Related Parties [Line Items]    
Share-based payments $ 328 $ 476
Termination benefits 470 385
Key management personnel compensation 2,034 2,313
Salaries and Benefits    
Disclosure Of Transactions Between Related Parties [Line Items]    
Key management compensation 1,136 1,065
Bonuses    
Disclosure Of Transactions Between Related Parties [Line Items]    
Key management compensation $ 100 $ 387