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Security Deposits and Other Assets (Details Narrative) (Brooklyn ImmunoTherapeutics, LLC) - Brooklyn Immunotherapeutics, LLC [Member] - USD ($)	Feb. 09, 2017	Jan. 24, 2020
Security deposit		$ 84,915
Master Services Agreement [Member]
Lease expiration date description	Expires in 2022
Amount paid to service provider	$ 300,401
Retainer percentage	10.00%

X

- Definition

Amount paid to service provider.

+ References

No definition available.

+ Details

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Namespace Prefix:	NTN_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Lease expiration date description.

+ References

No definition available.

+ Details

Name:	NTN_LeaseExpirationDateDescription
Namespace Prefix:	NTN_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Retainer percentage.

+ References

No definition available.

+ Details

Name:	NTN_RetainerPercentage
Namespace Prefix:	NTN_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of an asset, typically cash, provided to a counterparty to provide certain assurance of performance by the entity pursuant to the terms of a written or oral agreement, such as a lease.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.8,17)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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

X

- Details

Name:	srt_ConsolidatedEntitiesAxis=NTN_BrooklynImmunotherpeuticsLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TypeOfArrangementAxis=NTN_MasterServicesAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: