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Related Party Transactions - Transactions with other related parties (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Related Party Transaction [Line Items]      
Due from (to) related party $ 0   $ 43,985
Magni Partners      
Related Party Transaction [Line Items]      
Administrative expenses 858 $ 457  
Expenses from transactions with related party 858 457  
Due from (to) related party 1   $ (8)
Magni Partners | Consultancy Services      
Related Party Transaction [Line Items]      
Expenses from transactions with related party $ 900 $ 500