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, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Commitments And Contingencies [Line Items]    
Less: Accumulated depreciation and amortization $ (127)us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation $ (46)us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation
Capital lease assets, net 276us-gaap_CapitalLeasesBalanceSheetAssetsByMajorClassNet 14us-gaap_CapitalLeasesBalanceSheetAssetsByMajorClassNet
Furniture and Equipment    
Commitments And Contingencies [Line Items]    
Capital lease assets, gross 345us-gaap_CapitalLeasedAssetsGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
60us-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