XML 50 R39.htm IDEA: XBRL DOCUMENT v3.19.1
Leases - Summary of Balance Sheet Classification of Lease Liabilities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Operating lease liabilities    
Current portion of lease liabilities $ 4,468  
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:AccruedLiabilitiesCurrent us-gaap:AccruedLiabilitiesCurrent
Operating lease liabilities $ 6,754  
Total operating lease liabilities $ 11,222