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Leases - Additional Information (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Jan. 19, 2018
Dec. 31, 2017
Leases [Abstract]      
Operating lease expiration date 2018-05    
Operating lease, initial term   10 years  
Operating lease, option to extend additional term   7 years  
Operating lease assets $ 14,147   $ 472