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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle      
Right of use asset $ 16,000    
Operating lease liability 17,216    
Cash and cash equivalents, restricted cash $ 30,200   $ 24,100
ASU 2016-02      
New Accounting Pronouncements or Change in Accounting Principle      
Right of use asset   $ 17,500  
Operating lease liability   $ 18,700