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Related Party Transactions - Related Party Expenses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Related Party Transaction [Line Items]    
General and administrative expenses $ 29,146 $ 4,819
Majority Shareholder    
Related Party Transaction [Line Items]    
General and administrative expenses 383 3,906
Majority Shareholder | Compensation & Benefits    
Related Party Transaction [Line Items]    
General and administrative expenses 184 1,174
Majority Shareholder | Third party service fees    
Related Party Transaction [Line Items]    
General and administrative expenses 84 700
Majority Shareholder | Stock-based compensation    
Related Party Transaction [Line Items]    
General and administrative expenses 30 551
Majority Shareholder | Facility related expenses    
Related Party Transaction [Line Items]    
General and administrative expenses 80 1,134
Majority Shareholder | Other    
Related Party Transaction [Line Items]    
General and administrative expenses $ 5 $ 347