Annual report pursuant to Section 13 and 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
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Operating leases      
Operating lease right-of-use assets, non-current $ 9,959 $ 4,180 $ 0
Operating lease liabilities, current 1,683 976  
Operating lease liabilities, non-current 11,682 $ 3,729 $ 0
Total operating lease liabilities 13,365    
Finance leases      
Property and equipment, at cost 77    
Accumulated depreciation 41    
Property and equipment, net $ 36    
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:PropertyPlantAndEquipmentNet    
Finance lease liabilities, current $ 18    
Finance Lease Liability Current Statement Of Financial Position Extensible List us-gaap:OtherLiabilitiesCurrent    
Finance lease liabilities, non-current $ 1    
Finance Lease Liability Noncurrent Statement Of Financial Position Extensible List us-gaap:OtherLiabilitiesNoncurrent    
Total finance lease liabilities $ 19