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Property and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Property and equipment    
Property and equipment, gross $ 1,348us-gaap_PropertyPlantAndEquipmentGross $ 3,517us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation and amortization (934)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (3,241)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net 414us-gaap_PropertyPlantAndEquipmentNet 276us-gaap_PropertyPlantAndEquipmentNet
Laboratory Equipment [Member]    
Property and equipment    
Property and equipment, gross 552us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= kbio_LaboratoryEquipmentMember		 1,453us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= kbio_LaboratoryEquipmentMember
Computer, Equipment and Software [Member]    
Property and equipment    
Property and equipment, gross 519us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= kbio_ComputerEquipmentAndSoftwareMember		 493us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= kbio_ComputerEquipmentAndSoftwareMember
Furniture, Fixtures and leasehold improvements [Member]    
Property and equipment    
Property and equipment, gross $ 277us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= kbio_FurnitureFixturesAndLeaseholdImprovementsMember		 $ 1,571us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= kbio_FurnitureFixturesAndLeaseholdImprovementsMember