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Share-based Payments - Restricted Share Units Narrative (Details)
3 Months Ended 6 Months Ended
Jul. 20, 2020
shares
May 11, 2020
$ / shares
shares
Sep. 05, 2019
subsidiary
$ / shares
shares
Jun. 30, 2020
USD ($)
shares
Jun. 30, 2019
USD ($)
shares
Jun. 30, 2020
USD ($)
shares
Jun. 30, 2019
USD ($)
shares
May 11, 2020
$ / shares
Dec. 31, 2019
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Share-based payments | $       $ 2,546,000 $ 2,647,000 $ 4,982,000 $ 4,418,000    
Redwood                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of subsidiaries acquired | subsidiary     4            
Restricted share units                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Issuances (in shares)   279,277 732,972     279,277 0    
Vesting rights, number of common shares per award   1 1            
Share price at grant date (in dollars per share) | (per share)   $ 5.42 $ 15.34         $ 7.52  
Vesting period           3 years      
Share-based payments | $       $ 776,000 $ 0 $ 1,482,000 $ 0    
Outstanding awards (in shares)       1,012,249 0 1,012,249 0   732,972
Restricted share units | Subsequent Event                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Shares accelerated and vested (in shares) 732,972