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Non-Controlling Interests - Summary of Movement of the Non-controlling Interest in Temporary Equity in Company's Subsidiary (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Non-controlling Interests        
Net loss $ 1,863 $ 2,482 $ 8,524 $ 8,674
Other Noncontrolling Interest [Member]        
Non-controlling Interests        
Balance as at December 31, 2018     6,439  
Return of capital to non-controlling interests     (243)  
Share issuance costs from the issuance of subsidiary shares to a non-controlling interest     1,350  
Net loss     (785)  
Balance as at September 30, 2019 $ 6,761   $ 6,761