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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Present value of remaining lease payments $ 16,446  
Lease liability 13,188 $ 0
Right-of-use asset 11,681 $ 0
ASU 2016-02    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Lease liability 13,000  
Right-of-use asset $ 12,000