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Schedule of Property and Equipment, Net (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]      
Property and equipment, gross   $ 71us-gaap_PropertyPlantAndEquipmentGross $ 54us-gaap_PropertyPlantAndEquipmentGross
Less: Accumulated depreciation   (34)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (22)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net 69us-gaap_PropertyPlantAndEquipmentNet 37us-gaap_PropertyPlantAndEquipmentNet 32us-gaap_PropertyPlantAndEquipmentNet
Office Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross   27us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OfficeEquipmentMember
10us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OfficeEquipmentMember
Furniture and Fixtures [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross   $ 44us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
$ 44us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember