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Liquidity and Financial Condition (Details Textual) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Liquidity and Financial Condition [Line Items]    
Net Cash Provided By (Used In) Operating Activities $ (17,582,000)us-gaap_NetCashProvidedByUsedInOperatingActivities $ (10,559,000)us-gaap_NetCashProvidedByUsedInOperatingActivities
Share Based Compensation Aggregate Non Cash Charges For The Non Cash Interest Associated With The Accretion Of Our Convertible Notes Discount Net 29,400,000nwbo_ShareBasedCompensationAggregateNonCashChargesForNonCashInterestAssociatedWithAccretionOfOurConvertibleNotesDiscountNet  
Cash Equivalents, at Carrying Value 3,200,000us-gaap_CashEquivalentsAtCarryingValue  
Current Assets Less Payables 86,300,000nwbo_CurrentAssetsLessPayables  
Convertible Notes Payable Related Parties 5,800,000nwbo_ConvertibleNotesPayableRelatedParties  
Working Capital Deficit 46,400,000nwbo_WorkingCapitalDeficit  
Derivative Liability 67,100,000us-gaap_DerivativeLiabilities  
Noncash Derivative Liability $ 86,100,000nwbo_NoncashDerivativeLiability