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Leases - Additional Information (Detail)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Lessee Lease Description [Line Items]  
Lessee, operating lease, existence of option to extend true
Cash paid for operating leases $ 0.3
Right-of-use assets obtained in exchange for operating lease obligations 0.5
Lease expense $ 1.1
Minimum  
Lessee Lease Description [Line Items]  
Lessee, operating lease, renewal term 1 year
Maximum  
Lessee Lease Description [Line Items]  
Lessee, operating lease, renewal term 10 years