The amount of contingent payment obligation classified as non-current.

No definition available.

Name:	nwbo_ContingentPaymentObligationNoncurrent
Namespace Prefix:	nwbo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum percentage increase in contractual lease payments after the first year of the lease term.

+ References

No definition available.

+ Details

Name:	nwbo_LeasePaymentMaximumIncreasePercentage
Namespace Prefix:	nwbo_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The maximum term of lessee's operating lease termination contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	nwbo_LesseeOperatingLeaseMaximumTermOfLeaseTerminationContract
Namespace Prefix:	nwbo_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of lease termination cost required to pay for each quarter.

+ References

No definition available.

+ Details

Name:	nwbo_LesseeOperatingLeaseQuarterlyTerminationCost
Namespace Prefix:	nwbo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of additional liability recognized during the period relating to loss contingency liability.

+ References

No definition available.

+ Details

Name:	nwbo_LossContingencyAccrualAdditionalLiabilityRecognized
Namespace Prefix:	nwbo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of monthly cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use in year one.

+ References

No definition available.

+ Details

Name:	nwbo_OperatingLeaseMonthlyRentYear1
Namespace Prefix:	nwbo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of monthly cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use in year two.

+ References

No definition available.

+ Details

Name:	nwbo_OperatingLeaseMonthlyRentYear2
Namespace Prefix:	nwbo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of monthly cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use in year three.

+ References

No definition available.

+ Details

Name:	nwbo_OperatingLeaseMonthlyRentYear3
Namespace Prefix:	nwbo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of monthly cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

+ References

No definition available.

+ Details

Name:	nwbo_OperatingLeasePaymentsMonthly
Namespace Prefix:	nwbo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of refundable advance made on account of lease.

+ References

No definition available.

+ Details

Name:	nwbo_OperatingLeaseRefundableAdvance
Namespace Prefix:	nwbo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Indicates (true false) whether practical expedient is elected to account for lease component and nonlease component as single lease component.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 3A
-Subparagraph (a)
-SubTopic 30
-Topic 842
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479773/842-30-50-3A

+ Details

Name:	us-gaap_LeasePracticalExpedientLessorSingleLeaseComponent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:booleanItemType
Balance Type:	na
Period Type:	instant

- Definition

Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-3

+ Details

Name:	us-gaap_LesseeOperatingLeaseRenewalTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_LesseeOperatingLeaseTermOfContract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-1

Reference 2: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-10

+ Details

Name:	us-gaap_LossContingencyAccrualAtCarryingValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of loss contingency liability expected to be resolved within one year or the normal operating cycle, if longer.

+ References

+ Details

Name:	us-gaap_LossContingencyAccrualCarryingValueCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479041/842-20-45-1

+ Details

Name:	us-gaap_OperatingLeaseLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.

+ References

+ Details

Name:	us-gaap_OperatingLeaseLiabilityNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479041/842-20-45-1

+ Details

Name:	us-gaap_OperatingLeaseRightOfUseAsset
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Commitments and Contingencies - Additional information (Details) - USD ($)				9 Months Ended
	Aug. 31, 2026	Aug. 10, 2026	Oct. 24, 2025	Sep. 30, 2026	Aug. 05, 2026	Dec. 31, 2025
Commitments and Contingencies
Lease, practical expedient, lessor single lease component [true false]				true
Operating lease, term of contract					18 months
Monthly lease payments		$ 23,900
Maximum lease payment increase (in percent)		5.00%
Operating lease liabilities	$ 600,000	$ 400,000		$ 5,324,000
ROU asset	$ 600,000	400,000		4,853,000		$ 4,197,000
Amount of refundable advance		$ 23,900
Additional lease term (in years)	3 years
Monthly rent for year one	$ 24,000
Monthly rent for year two	25,000
Monthly rent for year three	$ 26,000
Lease termination cost required to pay in each quarter				$ 100,000
Term of lease termination contract (in years)				2 years 6 months
Lease liabilities, net of current portion				$ 4,843,000		4,411,000
Contingent loss liability related to lease settlement				900,000
Additional contingent loss liability			$ 800,000
Contingent loss liability related to lease settlement				1,000,000
Contingent payment obligation				$ 1,700,000		$ 1,700,000