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Share-based Payments - Summary of Restricted Share Units Activity (Details) - USD ($)
3 Months Ended 6 Months Ended
May 11, 2020
Sep. 05, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Share-based reserve            
Vesting of issued RSUs     $ 2,546,000 $ 2,647,000 $ 4,982,000 $ 4,418,000
Restricted share units            
Number of awards            
Balance at beginning of period (in shares)         732,972  
Issuance of RSUs (in shares) 279,277 732,972     279,277 0
Balance at end of period (in shares)     1,012,249 0 1,012,249 0
Share-based reserve            
Balance as of January 1, 2020         $ 889,000  
Vesting of issued RSUs     $ 776,000 $ 0 1,482,000 $ 0
Balance as of June 30, 2020     $ 2,371,000   $ 2,371,000