Annual report pursuant to Section 13 and 15(d)

Property and Equipment, Net - Summary of Property and Equipment, Net (Detail)

v2.4.1.9
Property and Equipment, Net - Summary of Property and Equipment, Net (Detail) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 1,666,319us-gaap_PropertyPlantAndEquipmentGross $ 1,556,549us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation and amortization (1,557,027)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (1,529,636)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net 109,292us-gaap_PropertyPlantAndEquipmentNet 26,913us-gaap_PropertyPlantAndEquipmentNet
Furniture and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 20,742us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
20,742us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
Laboratory Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 872,380us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentMember
769,157us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentMember
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 487,871us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
487,871us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
Office and Computer Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 285,326us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OfficeEquipmentMember
$ 278,779us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OfficeEquipmentMember