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COMMITMENTS AND CONTINGENCIES (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Sep. 04, 2013
Future minimum rent commitments      
2015 $ 928us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
2016 1,263us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
2017 1,289us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
2018 1,092us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
Total 4,572us-gaap_OperatingLeasesFutureMinimumPaymentsDue    
Commitments      
Total rent expense 262us-gaap_OperatingLeasesRentExpenseNet 287us-gaap_OperatingLeasesRentExpenseNet  
Amount of settlement agreement     $ 286nviv_AmountOfPaymentsDueUnderSettlementAgreement