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Leases - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Lessee Lease Description [Line Items]      
Lessee operating and financing lease existence of option to terminate   true  
Lessee operating and financing leases, period of options to terminate   1 year  
Lessee, operating and finance lease, existence of option to extend   true  
Lease cost $ 368   $ 1,097
Minimum [Member]      
Lessee Lease Description [Line Items]      
Operating and financing leases, remaining lease terms   1 year  
Maximum [Member]      
Lessee Lease Description [Line Items]      
Operating and financing leases, remaining lease terms   8 years