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DERIVATIVE INSTRUMENTS (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Changes in derivative warrant liability
Balance at beginning of year	$ 0us-gaap_DerivativeLiabilitiesCurrent	$ 14,585us-gaap_DerivativeLiabilitiesCurrent	$ 35,473us-gaap_DerivativeLiabilitiesCurrent
Issuance of warrants	6,848nviv_FairValueOfWarrantsIssuedInPeriod
Increase (decrease) in the fair value of the warrants	376	18,871	(17,480)
Fair value of derivative warrant liability reclassified to additional paid in capital		(33,456)	(3,408)
Balance at end of year	$ 7,224us-gaap_DerivativeLiabilitiesCurrent	$ 0us-gaap_DerivativeLiabilitiesCurrent	$ 14,585us-gaap_DerivativeLiabilitiesCurrent

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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