Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Adoption of Topic 606 and ASC 842, Cash Flows (Details)

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Summary of Significant Accounting Policies - Adoption of Topic 606 and ASC 842, Cash Flows (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Net loss $ (47,524) $ (82,815) $ (210,671) $ (231,580)
Net cash used in operating activities       (64,030)
Net cash used in investing activities       (564,349)
Net cash provided by financing activities       640,146
Net change in cash and restricted cash(1)     33,343 11,767
Cash and restricted cash, beginning of period     241,790 224,363
Cash and restricted cash, end of period $ 275,133 236,130 $ 275,133 236,130
Previously Reported        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Net loss   (80,187)   (218,513)
Net cash used in operating activities       (39,166)
Net cash used in investing activities       (589,144)
Net cash provided by financing activities       638,088
Net change in cash and restricted cash(1)       9,778
Cash and restricted cash, beginning of period       206,364
Cash and restricted cash, end of period   216,142   216,142
Adoption Impact | Accounting Standards Update 2014-09, Topic 230 and ASC 842        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Net loss       (13,067)
Net cash used in operating activities       (24,864)
Net cash used in investing activities       24,795
Net cash provided by financing activities       2,058
Net change in cash and restricted cash(1)       1,989
Cash and restricted cash, beginning of period       17,999
Cash and restricted cash, end of period   $ 19,988   $ 19,988