Annual report pursuant to Section 13 and 15(d)

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

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Commitments and Contingencies - Assets Relating to Capital Leases Included in Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Commitments And Contingencies [Line Items]    
Less: Finance lease accumulated depreciation and amortization $ (462) $ (426)
Finance lease assets, net 201 379
Less: Accumulated depreciation and amortization (462) (426)
Capital lease assets, net 201 379
Furniture and Equipment    
Commitments And Contingencies [Line Items]    
Finance lease assets, gross 605 747
Capital lease assets, gross 605 747
Software    
Commitments And Contingencies [Line Items]    
Finance lease assets, gross 58 58
Capital lease assets, gross $ 58 $ 58