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Summary of Significant Accounting Policies - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounting Policies [Abstract]          
Cash and cash equivalents $ 109,806 $ 77,671 $ 140,229    
Restricted cash 0   76    
Total cash and cash equivalents and restricted cash shown in the consolidated statement of cash flows $ 109,806 $ 77,671 $ 140,305 $ 263,453 $ 97,542