Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Assets Relating to Finance Leases Included in Equipment (Detail)

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Commitments and Contingencies - Assets Relating to Finance Leases Included in Equipment (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Commitments And Contingencies [Line Items]    
Finance lease assets, gross $ 180  
Less: Accumulated depreciation and amortization (408) $ (462)
Finance leases, net 180 201
Furniture and Equipment    
Commitments And Contingencies [Line Items]    
Finance lease assets, gross $ 588 605
Software    
Commitments And Contingencies [Line Items]    
Finance lease assets, gross   $ 58