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Leases - Summary of Supplemental Balance Sheet Information Related to Leases (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Jan. 01, 2019
Operating leases    
Right-of-use assets from operating leases $ 13,810 $ 13,300
Operating lease liabilities, current $ 2,606  
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:AccountsPayableAndAccruedLiabilitiesMember  
Operating lease liabilities (Note 12) $ 11,328  
Total operating lease liabilities 13,934 $ 13,300
Finance leases    
Finance leases right of use asset $ 3,333  
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:PropertyPlantAndEquipmentMember  
Finance lease liabilities, current $ 506  
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:AccountsPayableAndAccruedLiabilitiesMember  
Finance lease liabilities, non-current $ 7,473  
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesMember  
Total finance lease liabilities $ 7,979