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Recently Issued Accounting Pronouncements - Additional Information (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease assets $ 23,333 $ 21,200 $ 0
Total operating lease liabilities $ 24,677 22,200  
Adoption of ASU 2016-02      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect of adoption of Topic 842   72  
Retained Deficit | Adoption of ASU 2016-02      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect of adoption of Topic 842   $ 72