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Leases - Additional Information (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Jan. 01, 2019
Lessee, Lease, Description [Line Items]    
Operating lease right of use assets $ 6,575  
Operating lease liabilities $ 6,672  
Accounting Standards Update 2016-02 [Member]    
Lessee, Lease, Description [Line Items]    
Operating lease right of use assets   $ 7,000
Operating lease liabilities   $ 7,000