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Notes Payable (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Notes Payable [Line Items]    
Notes payable - current $ 934us-gaap_NotesPayableCurrent $ 934us-gaap_NotesPayableCurrent
Convertible notes payable, net - current 238us-gaap_ConvertibleNotesPayableCurrent 288us-gaap_ConvertibleNotesPayableCurrent
Convertible notes payable related party, net - current 50nwbo_ConvertibleNotesPayableCurrentRelatedParties 75nwbo_ConvertibleNotesPayableCurrentRelatedParties
Total notes payable, net 1,172us-gaap_NotesPayable 1,222us-gaap_NotesPayable
Notes Payable Current, Unsecured, Issued One [Member]    
Notes Payable [Line Items]    
Notes payable - current 934us-gaap_NotesPayableCurrent
/ us-gaap_ShortTermDebtTypeAxis
= nwbo_NotesPayableCurrentUnsecuredIssuedOneMember		 [1] 934us-gaap_NotesPayableCurrent
/ us-gaap_ShortTermDebtTypeAxis
= nwbo_NotesPayableCurrentUnsecuredIssuedOneMember		 [1]
Convertible Notes Payable Current, Unsecured, Issued One [Member]    
Notes Payable [Line Items]    
Convertible notes payable, net - current 135us-gaap_ConvertibleNotesPayableCurrent
/ us-gaap_ShortTermDebtTypeAxis
= nwbo_ConvertibleNotesPayableCurrentUnsecuredIssuedOneMember		 [2] 160us-gaap_ConvertibleNotesPayableCurrent
/ us-gaap_ShortTermDebtTypeAxis
= nwbo_ConvertibleNotesPayableCurrentUnsecuredIssuedOneMember		 [2]
Convertible Notes Payable Current Unsecured Issued Two [Member]    
Notes Payable [Line Items]    
Convertible notes payable, net - current 53us-gaap_ConvertibleNotesPayableCurrent
/ us-gaap_ShortTermDebtTypeAxis
= nwbo_ConvertibleNotesPayableCurrentUnsecuredIssuedTwoMember		 [3] 53us-gaap_ConvertibleNotesPayableCurrent
/ us-gaap_ShortTermDebtTypeAxis
= nwbo_ConvertibleNotesPayableCurrentUnsecuredIssuedTwoMember		 [3]
Convertible Notes Payable Related Parties Current Unsecured Issued One [Member]    
Notes Payable [Line Items]    
Convertible notes payable related party, net - current $ 50nwbo_ConvertibleNotesPayableCurrentRelatedParties
/ us-gaap_ShortTermDebtTypeAxis
= nwbo_ConvertibleNotesPayableRelatedPartiesCurrentUnsecuredIssuedOneMember		 [4] $ 75nwbo_ConvertibleNotesPayableCurrentRelatedParties
/ us-gaap_ShortTermDebtTypeAxis
= nwbo_ConvertibleNotesPayableRelatedPartiesCurrentUnsecuredIssuedOneMember		 [4]
[1] This $0.934 million note, which was originally due in July 2011 is currently under dispute with the creditor as to the validity of the note payable balance, which the Company believes has already been paid in full and is not outstanding.
[2] The balance of $0.160 million as of December 31, 2013 consists of three separate 6% notes in the amounts of $0.110 million, $0.025 million and $0.025 million. In regard to the $0.110 million note, the Company has made ongoing attempts to locate the creditor to repay or convert this note, but has been unable to locate the creditor to date. In regard to the $0.025 million note, the holder has elected to convert these notes into equity. The Company has delivered the applicable conversion documents to the holder, and the Company is waiting for the holder to execute and return the documents. Until such documents are executed the Company will continue to include this convertible note as outstanding. In regard to the other $0.025 million note, the holder has converted this note and related accrued interest into equity in March 2014.
[3] This $0.530 million note was due May 25, 2014, and is currently past due.
[4] This $0.050 million demand note as of December 31, 2014 is held by an officer of the Company. The holder has made no demand for payment, but reserves the right to make a demand at any time.