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Leases - Schedule of Lease-Related Assets and Liabilities Recorded on Condensed Consolidated Balance Sheet (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Jan. 01, 2019
ASSETS    
Operating lease right of use assets, net $ 30,134 $ 4,800
Liabilities    
Operating lease liabilities, current $ 2,495  
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent  
Operating lease liability, noncurrent $ 31,338  
Total operating lease liabilities $ 33,833 $ 6,400