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Property and Equipment - Summary of Property and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 1,832us-gaap_PropertyPlantAndEquipmentGross $ 1,777us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation and amortization (1,490)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (1,532)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net 342us-gaap_PropertyPlantAndEquipmentNet 245us-gaap_PropertyPlantAndEquipmentNet
Laboratory Equipment [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 1,163us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentMember
1,246us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentMember
Computer Equipment [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 260us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerEquipmentMember
183us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerEquipmentMember
Office Furniture and Equipment [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 292us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OfficeEquipmentMember
257us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OfficeEquipmentMember
Leasehold Improvements [Member]    
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 117us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
$ 91us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember