Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income (loss)	$ (18,346)us-gaap_NetIncomeLoss	$ (38,756)us-gaap_NetIncomeLoss	$ 4,664us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation and amortization expense	752	740	367
Non-cash derivative (gain) losses	376	18,871	(17,480)
Non-cash interest expense			22nviv_NonCashInterestExpenseIncomeNet
Non-cash loss from modification of warrants		765us-gaap_FairValueAdjustmentOfWarrants
Common stock issued to 401(k) plan	173	192	92
Common stock issued for services	477		25
Share-based compensation expense	2,730us-gaap_ShareBasedCompensation	3,136us-gaap_ShareBasedCompensation	1,233us-gaap_ShareBasedCompensation
Changes in operating assets and liabilities:
Restricted cash	180		(54)
Prepaid expenses	(363)	124	(61)
Insurance receivable	(689)
Other assets	4	5
Accounts payable	(330)	(254)	585
Accrued expenses	(248)	271	403
Net cash used in operating activities	(15,284)	(14,906)	(10,204)
Cash flows from investing activities:
Non-cash disposals of property and equipment	45
Purchases of property and equipment	(47)	(749)	(2,141)
Net cash used in investing activities	(2)	(749)	(2,141)
Cash flows from financing activities:
Proceeds from exercise of stock options	212	456	111
Proceeds from exercise of warrants, net	12us-gaap_ProceedsFromWarrantExercises	15,952us-gaap_ProceedsFromWarrantExercises	1,129us-gaap_ProceedsFromWarrantExercises
Proceeds from issuance of note payable		150us-gaap_ProceedsFromNotesPayable
Repayment of note payable	(56)us-gaap_RepaymentsOfNotesPayable	(57)us-gaap_RepaymentsOfNotesPayable
Principal payments on capital lease obligation	(21)	(33)	(33)
Proceeds from loans payable		342	1,747
Repayment of loans payable			(303)us-gaap_RepaymentsOfLongTermDebt
Proceeds from issuance of common stock and warrants	14,618		18,155
Net cash provided by financing activities	14,765	16,810	20,806
Increase (Decrease) in cash and cash equivalents	(521)	1,155	8,461
Cash and cash equivalents at beginning of period	13,980	12,825	4,364
Cash and cash equivalents at end of period	13,459	13,980	12,825
Supplemental disclosure of cash flow information and non-cash transactions:
Cash paid for interest	132us-gaap_InterestPaidNet	125us-gaap_InterestPaidNet	50us-gaap_InterestPaidNet
Fair value of warrants issued in connection with underwriting agreement	6,848nviv_FairValueOfWarrantsIssuedInPeriod
Fair value of warrants issued in connection with loan agreement			32
Reclassification of derivative warrant liability to additional paid-in capital		$ 33,456	$ 3,409

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