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Property and Equipment (Details Textual)
In Millions, unless otherwise specified
12 Months Ended 0 Months Ended 1 Months Ended
Dec. 31, 2014
USD ($)
Dec. 09, 2014
UK Facility [Member]
USD ($)
acre
Dec. 09, 2014
UK Facility [Member]
EUR (€)
Aug. 19, 2014
UK Facility [Member]
USD ($)
acre
Aug. 19, 2014
UK Facility [Member]
EUR (€)
acre
Depreciation $ 0.01us-gaap_Depreciation        
Environmental Costs Recognized, Capitalized   2.4us-gaap_EnvironmentalCostsRecognizedCapitalized
/ us-gaap_StatementGeographicalAxis
= nwbo_UkFacilityMember
     
Payments to Acquire Businesses, Gross   7.9us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_StatementGeographicalAxis
= nwbo_UkFacilityMember
5.0us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_StatementGeographicalAxis
= nwbo_UkFacilityMember
20.8us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_StatementGeographicalAxis
= nwbo_UkFacilityMember
13.0us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_StatementGeographicalAxis
= nwbo_UkFacilityMember
Professional Fees       2.6us-gaap_ProfessionalFees
/ us-gaap_StatementGeographicalAxis
= nwbo_UkFacilityMember
 
Area of Land   12us-gaap_AreaOfLand
/ us-gaap_StatementGeographicalAxis
= nwbo_UkFacilityMember
12us-gaap_AreaOfLand
/ us-gaap_StatementGeographicalAxis
= nwbo_UkFacilityMember
25us-gaap_AreaOfLand
/ us-gaap_StatementGeographicalAxis
= nwbo_UkFacilityMember
25us-gaap_AreaOfLand
/ us-gaap_StatementGeographicalAxis
= nwbo_UkFacilityMember
Accrued Environmental Loss Contingencies, Noncurrent $ 6.2us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent