Annual report pursuant to Section 13 and 15(d)

Consolidated Statements of Stockholders' Equity (Deficit)

v2.4.1.9
Consolidated Statements of Stockholders' Equity (Deficit) (USD $)
Total
Preferred Stock [Member]
Common Stock [Member]
Additional Paid-In Capital [Member]
Accumulated Deficit [Member]
Balance at Dec. 31, 2011 $ 21,131,747us-gaap_StockholdersEquity $ 10us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
$ 95,399us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 266,393,645us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ (245,357,307)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Balance, shares at Dec. 31, 2011   10,083us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
95,398,961us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issued restricted stock 455us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross   455us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Issued restricted stock, shares     455,000us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Canceled forfeited restricted stock (596)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures   (601)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
5us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
 
Canceled forfeited restricted stock, shares     (600,500)us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Issued stock upon exercise of stock options, net 743,295us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised   1,226us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
742,069us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
 
Issued stock upon exercise of stock options, net, shares 1,225,271navb_StockIssuedDuringPeriodSharesStockOptionsExercisedNet   1,225,271navb_StockIssuedDuringPeriodSharesStockOptionsExercisedNet
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Canceled stock to pay employee tax obligations (100,875)navb_RepurchaseAndCancellationOfCommonStockAtMarketForEmployeeTaxWithholdingValue   (37)navb_RepurchaseAndCancellationOfCommonStockAtMarketForEmployeeTaxWithholdingValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(100,838)navb_RepurchaseAndCancellationOfCommonStockAtMarketForEmployeeTaxWithholdingValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
 
Canceled stock to pay employee tax obligations, shares     (37,500)navb_RepurchaseAndCancellationOfCommonStockAtMarketForEmployeeTaxWithholdingShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Issued stock to 401(k) plan 50,272navb_StockIssuedDuringPeriodValueFourZeroOneKContribution   17navb_StockIssuedDuringPeriodValueFourZeroOneKContribution
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
50,255navb_StockIssuedDuringPeriodValueFourZeroOneKContribution
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
 
Issued stock to 401(k) plan, shares 17,390navb_StockIssuedDuringPeriodSharesFourZeroOneKContribution   17,390navb_StockIssuedDuringPeriodSharesFourZeroOneKContribution
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Issued stock upon exercise of warrants, net 1,978,601navb_StockIssuedDuringPeriodValueStockWarrantsExercised   6,020navb_StockIssuedDuringPeriodValueStockWarrantsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
1,972,581navb_StockIssuedDuringPeriodValueStockWarrantsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
 
Issued stock upon exercise of warrants, net, shares     6,020,000navb_StockIssuedDuringPeriodSharesStockWarrantsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Issued stock for payment of sublicense fee 1,146,000us-gaap_StockIssuedDuringPeriodValueIssuedForNoncashConsiderations   300us-gaap_StockIssuedDuringPeriodValueIssuedForNoncashConsiderations
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
1,145,700us-gaap_StockIssuedDuringPeriodValueIssuedForNoncashConsiderations
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
 
Issued stock for payment of sublicense fee, shares 300,000us-gaap_StockIssuedDuringPeriodSharesIssuedForNoncashConsideration   300,000us-gaap_StockIssuedDuringPeriodSharesIssuedForNoncashConsideration
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Conversion of Series B preferred stock to common stock, net   (2)us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
7,014us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(7,012)us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
 
Conversion of Series B preferred stock to common stock, shares   2,145us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
7,014,150us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Conversion of Series C preferred stock to common stock   (1)navb_StockIssuedDuringPeriodValueConversionOfPreferredStockToCommonStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
3,226navb_StockIssuedDuringPeriodValueConversionOfPreferredStockToCommonStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(3,225)navb_StockIssuedDuringPeriodValueConversionOfPreferredStockToCommonStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
 
Conversion of Series C preferred stock to common stock, shares   1,000navb_StockIssuedDuringPeriodSharesConversionOfPreferredStockToCommonStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
3,226,000navb_StockIssuedDuringPeriodSharesConversionOfPreferredStockToCommonStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Effect of change in terms of warrants 496,671navb_AdjustmentsToAdditionalPaidInCapitalEffectOfChangeInTermsOfWarrants     496,671navb_AdjustmentsToAdditionalPaidInCapitalEffectOfChangeInTermsOfWarrants
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
 
Recovery of shareholder short swing profits 45,473navb_AdjustmentstoAdditionalPaidinCapitalRecoveryofShareholderProfits     45,473navb_AdjustmentstoAdditionalPaidinCapitalRecoveryofShareholderProfits
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
 
Stock compensation expense 2,304,118us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue     2,304,118us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
 
Preferred stock dividends (43,333)us-gaap_DividendsPreferredStock       (43,333)us-gaap_DividendsPreferredStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Net loss (29,157,204)us-gaap_NetIncomeLoss       (29,157,204)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Balance at Dec. 31, 2012 (1,405,376)us-gaap_StockholdersEquity 7us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
113,019us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
273,039,442us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
(274,557,844)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Balance, shares at Dec. 31, 2012   6,938us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
113,018,772us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issued stock in connection with public offerings, net of costs 38,131,472us-gaap_StockIssuedDuringPeriodValueNewIssues   14,205us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
38,117,267us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
 
Issued stock in connection with public offerings, net of costs, shares     14,205,770us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Issued restricted stock 74us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross   74us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Issued restricted stock, shares     73,500us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Canceled forfeited restricted stock (29)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures   (29)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Canceled forfeited restricted stock, shares     (29,250)us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Issued stock upon exercise of stock options, net (9,161)us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised   40us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(9,201)us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
 
Issued stock upon exercise of stock options, net, shares 39,649navb_StockIssuedDuringPeriodSharesStockOptionsExercisedNet   39,649navb_StockIssuedDuringPeriodSharesStockOptionsExercisedNet
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Canceled stock to pay employee tax obligations (610,556)navb_RepurchaseAndCancellationOfCommonStockAtMarketForEmployeeTaxWithholdingValue   (194)navb_RepurchaseAndCancellationOfCommonStockAtMarketForEmployeeTaxWithholdingValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(610,362)navb_RepurchaseAndCancellationOfCommonStockAtMarketForEmployeeTaxWithholdingValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
 
Canceled stock to pay employee tax obligations, shares     (194,077)navb_RepurchaseAndCancellationOfCommonStockAtMarketForEmployeeTaxWithholdingShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Issued stock to 401(k) plan 66,777navb_StockIssuedDuringPeriodValueFourZeroOneKContribution   22navb_StockIssuedDuringPeriodValueFourZeroOneKContribution
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
66,755navb_StockIssuedDuringPeriodValueFourZeroOneKContribution
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
 
Issued stock to 401(k) plan, shares 22,126navb_StockIssuedDuringPeriodSharesFourZeroOneKContribution   22,126navb_StockIssuedDuringPeriodSharesFourZeroOneKContribution
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Issued stock upon exercise of warrants, net 6,161,332navb_StockIssuedDuringPeriodValueStockWarrantsExercised 2navb_StockIssuedDuringPeriodValueStockWarrantsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
3,000navb_StockIssuedDuringPeriodValueStockWarrantsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
6,158,330navb_StockIssuedDuringPeriodValueStockWarrantsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
 
Issued stock upon exercise of warrants, net, shares   2,365navb_StockIssuedDuringPeriodSharesStockWarrantsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
3,000,000navb_StockIssuedDuringPeriodSharesStockWarrantsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Conversion of Series B preferred stock to common stock, net 0us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities (1)us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
5,682us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(5,681)us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
 
Conversion of Series B preferred stock to common stock, shares   1,738us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
5,682,933us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Issued stock for payment of milestone fee 166,000navb_StockIssuedDuringPeriodValueIssuedforMilestoneFee   100navb_StockIssuedDuringPeriodValueIssuedforMilestoneFee
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
165,900navb_StockIssuedDuringPeriodValueIssuedforMilestoneFee
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
 
Issued stock for payment of milestone fee, shares 100,000navb_StockIssuedDuringPeriodSharesIssuedforMilestoneFee   100,000navb_StockIssuedDuringPeriodSharesIssuedforMilestoneFee
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Issued warrants in connection with debt issuance 967,115us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued     967,115us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
 
Issued warrants in connection with public offering (7,686,046)navb_AdjustmentstoAdditionalPaidinCapitalWarrantIssuedEquityOffering     (7,686,046)navb_AdjustmentstoAdditionalPaidinCapitalWarrantIssuedEquityOffering
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
 
Stock compensation expense 2,908,269us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue     2,908,269us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
 
Net loss (42,699,458)us-gaap_NetIncomeLoss       (42,699,458)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Balance at Dec. 31, 2013 (4,009,587)us-gaap_StockholdersEquity 8us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
135,919us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
313,111,788us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
(317,257,302)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Balance, shares at Dec. 31, 2013   7,565us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
135,919,423us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issued restricted stock 380us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross   380us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Issued restricted stock, shares     380,250us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Canceled forfeited restricted stock (300)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures   (300)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
 
Canceled forfeited restricted stock, shares     (300,000)us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Issued stock upon exercise of stock options, net (51,369)us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised   300us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(51,669)us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
 
Issued stock upon exercise of stock options, net, shares 299,360navb_StockIssuedDuringPeriodSharesStockOptionsExercisedNet   299,360navb_StockIssuedDuringPeriodSharesStockOptionsExercisedNet
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Canceled stock to pay employee tax obligations (8,819)navb_RepurchaseAndCancellationOfCommonStockAtMarketForEmployeeTaxWithholdingValue   (6)navb_RepurchaseAndCancellationOfCommonStockAtMarketForEmployeeTaxWithholdingValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(8,813)navb_RepurchaseAndCancellationOfCommonStockAtMarketForEmployeeTaxWithholdingValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
 
Canceled stock to pay employee tax obligations, shares     (6,582)navb_RepurchaseAndCancellationOfCommonStockAtMarketForEmployeeTaxWithholdingShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Issued stock to 401(k) plan 100,043navb_StockIssuedDuringPeriodValueFourZeroOneKContribution   36navb_StockIssuedDuringPeriodValueFourZeroOneKContribution
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
100,007navb_StockIssuedDuringPeriodValueFourZeroOneKContribution
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
 
Issued stock to 401(k) plan, shares 36,455navb_StockIssuedDuringPeriodSharesFourZeroOneKContribution   36,455navb_StockIssuedDuringPeriodSharesFourZeroOneKContribution
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Issued stock upon exercise of warrants, net 7,686,773navb_StockIssuedDuringPeriodValueStockWarrantsExercised   3,843navb_StockIssuedDuringPeriodValueStockWarrantsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
7,682,930navb_StockIssuedDuringPeriodValueStockWarrantsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
 
Issued stock upon exercise of warrants, net, shares     3,843,223navb_StockIssuedDuringPeriodSharesStockWarrantsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Issued stock in payment of Board retainers 89,375us-gaap_StockIssuedDuringPeriodValueIssuedForServices   68us-gaap_StockIssuedDuringPeriodValueIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
89,307us-gaap_StockIssuedDuringPeriodValueIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
 
Issued stock in payment of Board retainers, shares     67,710us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Conversion of Series B preferred stock to common stock, net 0us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities (4)us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
9,960us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
(9,956)us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
 
Conversion of Series B preferred stock to common stock, shares   3,046us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
9,960,420us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Issued warrants in connection with debt issuance 464,991us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued     464,991us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
 
Recovery of shareholder short swing profits 17,554navb_AdjustmentstoAdditionalPaidinCapitalRecoveryofShareholderProfits     17,554navb_AdjustmentstoAdditionalPaidinCapitalRecoveryofShareholderProfits
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
 
Stock compensation expense 1,634,162us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue     1,634,162us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
 
Net loss (35,726,669)us-gaap_NetIncomeLoss       (35,726,669)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Balance at Dec. 31, 2014 $ (29,803,466)us-gaap_StockholdersEquity $ 4us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
$ 150,200us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 323,030,301us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ (352,983,971)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Balance, shares at Dec. 31, 2014   4,519us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
150,200,259us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember