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COMMON STOCK (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 1 Months Ended
Mar. 31, 2015
Jan. 31, 2015
Apr. 08, 2015
Dec. 31, 2014
Common stock, number of shares, par value and other disclosures        
Common stock, authorized 50,000,000us-gaap_CommonStockSharesAuthorized     50,000,000us-gaap_CommonStockSharesAuthorized
Common stock, par value (in dollars per share) $ 0.00001us-gaap_CommonStockParOrStatedValuePerShare   $ 0.00001us-gaap_CommonStockParOrStatedValuePerShare $ 0.00001us-gaap_CommonStockParOrStatedValuePerShare
Common stock, issued 26,011,852us-gaap_CommonStockSharesIssued     23,453,000us-gaap_CommonStockSharesIssued
Common stock, outstanding 26,011,852us-gaap_CommonStockSharesOutstanding     23,453,000us-gaap_CommonStockSharesOutstanding
Common stock disclosures        
Proceeds from exercise of stock options $ 131us-gaap_ProceedsFromStockOptionsExercised      
Proceeds from exercise of warrants 2,819us-gaap_ProceedsFromWarrantExercises      
Issuance of common stock to 401(k) plan (in dollars) 53us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan      
Common Stock        
Common stock disclosures        
Issuance of common stock upon exercise of stock options (in shares) 62,580nviv_ShareBasedCompensationArrangementByExerciseOfStockOptions
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Issuance of stock options to purchase common stock (in shares) 41,275nviv_StockOptionsIssuedToPurchaseCommonStock
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Issuance of stock for services (in shares) 12,707us-gaap_StockIssuedDuringPeriodSharesIssuedForNoncashConsideration
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Issuance of stock (in shares) 49,873us-gaap_StockIssuedDuringPeriodSharesIssuedForCash
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Proceeds from exercise of stock options 131us-gaap_ProceedsFromStockOptionsExercised
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Issuance of common stock upon exercise of warrants (in shares) 491,816nviv_StockIssuedDuringPeriodWarrantsExercised
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Warrants to purchase through cashless exercise provisions (in shares) 2,669nviv_CommonStockExercisedThroughCashlessToWarrants
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Shares issued through cashless exercise provisions 1,624nviv_StockIssuedDuringPeriodCashlessExerciseOfWarrants
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Warrants to purchase exercise through cash (in shares) 490,192nviv_CommonStockExercisedForCashToWarrants
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Issuance of common stock to 401(k) plan (in shares) 4,456us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan
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Common Stock | Public offering        
Common stock disclosures        
Number of shares issued under underwritten public offering (in shares)   2,000,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
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Net proceeds from issuance of equity (in dollars)   $ 11,038us-gaap_ProceedsFromIssuanceOfCommonStock
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