Quarterly report pursuant to Section 13 or 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, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Commitments And Contingencies [Line Items]    
Less: Accumulated depreciation and amortization $ (144)us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation $ (127)us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation
Capital lease assets, net 270us-gaap_CapitalLeasesBalanceSheetAssetsByMajorClassNet 276us-gaap_CapitalLeasesBalanceSheetAssetsByMajorClassNet
Furniture and Equipment    
Commitments And Contingencies [Line Items]    
Capital lease assets, gross 356us-gaap_CapitalLeasedAssetsGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
345us-gaap_CapitalLeasedAssetsGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
Software    
Commitments And Contingencies [Line Items]    
Capital lease assets, gross $ 58us-gaap_CapitalLeasedAssetsGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareDevelopmentMember
$ 58us-gaap_CapitalLeasedAssetsGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareDevelopmentMember