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Fixed Assets - Schedule of Fixed Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Less accumulated depreciation and amortization $ (1,192)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment $ (972)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Total 10,153us-gaap_PropertyPlantAndEquipmentNet 10,356us-gaap_PropertyPlantAndEquipmentNet
Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 925us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentMember
913us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentMember
Furniture and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross 1,620us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
1,620us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, Gross $ 8,800us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
$ 8,795us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember