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Summary of Significant Accounting Policies - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Accounting Policies [Abstract]        
Cash $ 99,188 $ 77,671 $ 140,229  
Restricted cash 0   76  
Total cash and restricted cash shown in the condensed consolidated statement of cash flows $ 99,188 $ 77,671 $ 140,305 $ 263,453