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Debt - Schedule of Minimum Adjusted EBITDA (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)
Minimum Adjusted EBITDA	$ 1,200
March 31, 2018 [Member]
Minimum Adjusted EBITDA	600
September 30, 2018 [Member]
Minimum Adjusted EBITDA	1,600
December 31, 2018 [Member]
Minimum Adjusted EBITDA	$ 1,500

X

- Definition

Minimum adjusted earnings before interest, taxes, depreciation, and amortization.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_StatementScenarioAxis=NTN_MarchThirdyFirstTwoThousandEighteenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementScenarioAxis=NTN_SeptemberThirdyTwoThousandEighteenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementScenarioAxis=NTN_DecemberThirdyFirstTwoThousandEighteenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: