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RESTRICTED CASH (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Restricted cash    
Restricted cash $ 361us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue $ 422us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
Security deposit related to credit card account    
Restricted cash    
Restricted cash 50us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= nviv_SecurityDepositRelatedToCreditCardAccountsMember
 
Standby letter of credit in favor of a landlord    
Restricted cash    
Restricted cash $ 311us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= us-gaap_StandbyLettersOfCreditMember