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Equity Method Investments - Summarized unaudited financial data (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2018
USD ($)
Summary financial information of equity method investments  
Current assets $ 16,777
Non-current assets 54,253
Current liabilities 50,424
Non-current liabilities 77,381
Redeemable stock and noncontrolling interests 14,187
Net revenue 14,763
Operating loss (46,729)
Net loss $ (53,359)