Quarterly report pursuant to Section 13 or 15(d)

Leases - Schedule of Balance Sheets Classification of Leases (Detail)

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Leases - Schedule of Balance Sheets Classification of Leases (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Jan. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Operating leases        
Operating lease right-of-use-asset $ 11,131 $ 7,200 $ 4,180 $ 0
Operating lease liabilities, Current 965   976  
Operating lease liabilities, Long-term 10,770   $ 3,729 $ 0
Total operating lease liabilities 11,735 $ 7,200    
Finance leases        
Property and equipment, at cost 57      
Accumulated depreciation 15      
Property and equipment, net $ 42      
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:PropertyPlantAndEquipmentNet      
Other current liabilities $ 31      
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesCurrent      
Other liabilities $ 12      
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesNoncurrent      
Total finance lease liabilities $ 43