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PROPERTY AND EQUIPMENT (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Property and equipment    
Less accumulated depreciation and amortization $ (2,010)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment $ (1,276)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment,net 1,605us-gaap_PropertyPlantAndEquipmentNet 2,337us-gaap_PropertyPlantAndEquipmentNet
Computer software and hardware    
Property and equipment    
Gross property and equipment 562us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= nviv_ComputerHardwareAndSoftwareMember		 560us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= nviv_ComputerHardwareAndSoftwareMember
Research and lab equipment    
Property and equipment    
Gross property and equipment 1,873us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentMember		 1,881us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentMember
Leasehold improvements    
Property and equipment    
Gross property and equipment 390us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember		 381us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
Office Equipment    
Property and equipment    
Gross property and equipment $ 790us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OfficeEquipmentMember		 $ 791us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OfficeEquipmentMember