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Stockholders’ Equity (Deficit) (Details Textual) (USD $)
3 Months Ended 84 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Shareholders Deficit [Line Items]      
Fair value of Warrants at Issuance Date $ 500,000nwbo_FairValueOfWarrantsAtIssuanceDate   $ 500,000nwbo_FairValueOfWarrantsAtIssuanceDate
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 888,187us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised    
Proceeds from Warrant Exercises 3,651,000us-gaap_ProceedsFromWarrantExercises 2,692,000us-gaap_ProceedsFromWarrantExercises  
Warrants Issued During Period     14,323,003nwbo_WarrantsIssuedDuringPeriod
Warrants Issued, Weighted Average Exercise Price Per Warrant     $ 3.3nwbo_WarrantsIssuedWeightedAverageExercisePricePerWarrant
Warrants Issued, Weighted Average Remaining Contractual Term     4 years 4 months 24 days
Fair Value Of Common Stock Issued For Redemption of Redeemable Securities 300,000nwbo_FairValueOfCommonStockIssuedForRedemptionOfRedeemableSecurities    
Stock Issued During Period, Shares, Other 80,068us-gaap_StockIssuedDuringPeriodSharesOther    
Stock Issued During Period Value Redeemable Securities Settlement 299,000nwbo_StockIssuedDuringPeriodValueRedeemableSecuritiesSettlement    
Development Stage Entities, Stock Issued, Value, Issued for Noncash Consideration 520,000us-gaap_StockIssuedDuringPeriodValueIssuedForNoncashConsiderations    
Stock Issued During Period, Shares, Cashless Exercise of Warrants 385,000nwbo_StockIssuedDuringPeriodSharesCashlessExerciseOfWarrants    
Common Stock [Member]      
Shareholders Deficit [Line Items]      
Development Stage Entities, Stock Issued, Shares, Issued for Noncash Consideration 385,000us-gaap_StockIssuedDuringPeriodSharesIssuedForNoncashConsideration
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Stock Issued During Period Value Redeemable Securities Settlement 0nwbo_StockIssuedDuringPeriodValueRedeemableSecuritiesSettlement
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
   
Development Stage Entities, Stock Issued, Value, Issued for Noncash Consideration $ 0us-gaap_StockIssuedDuringPeriodValueIssuedForNoncashConsiderations
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember