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Property and Equipment, Net (Detail) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross   $ 362,033us-gaap_PropertyPlantAndEquipmentGross $ 317,226us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation and amortization   (304,980)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (292,739)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property, plant and equipment, net 81,597us-gaap_PropertyPlantAndEquipmentNet 57,053us-gaap_PropertyPlantAndEquipmentNet 24,487us-gaap_PropertyPlantAndEquipmentNet
Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross   321,884us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentMember		 286,397us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentMember
Office Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross   31,170us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OfficeEquipmentMember		 21,850us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OfficeEquipmentMember
Furniture and Fixtures [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross   $ 8,979us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember		 $ 8,979us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember