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Summary of Significant Accounting Policies - Summarized Financial Information for the Equity Method Investments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]          
Operating expenses $ 71,660 $ 98,919 $ 227,093 $ 286,117  
Operating loss (48,617) (66,471) (144,729) (168,728)  
Other, net (3,882) (3,727) (6,553) (13,911)  
Equity Method Investments          
Schedule of Equity Method Investments [Line Items]          
Current assets 16,983   16,983   $ 17,485
Noncurrent assets 59,231   59,231   31,274
Total assets 76,214   76,214   48,759
Current liabilities 6,788   6,788   4,226
Noncurrent liabilities 4,766   4,766   0
Total liabilities 11,554   11,554   4,226
Net assets 64,660   64,660   $ 44,533
Revenues 206 113 601 353  
Operating expenses 6,843 11,621 21,604 30,762  
Operating loss (6,637) (11,508) (21,003) (30,409)  
Other, net 1 12 9 33  
Net loss $ (6,636) $ (11,496) $ (20,994) $ (30,376)