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Related-party Transactions - Compensation of key management personnel (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Related-party Transactions      
Short-term employee benefits $ 822 $ 855 $ 829
Post-employment benefits 7 7 7
Share-based compensation 14 41 226
Total Key management personnel compensation $ 843 $ 903 $ 1,062