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9. Stockholders' Equity (Details-Restricted Stock Units) (Restricted Stock Units (RSUs) [Member], USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Restricted Stock Units (RSUs) [Member] |  |
Outstanding Restricted Stock Units |  |
RSUs outstanding, beginning balance | 187,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | 560,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
RSUs granted | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
RSUs released | (173,000)ntn_RestrictedStockUnitsReleased / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | (373,000)ntn_RestrictedStockUnitsReleased / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
RSUs cancelled | (14,000)ntn_RestrictedStockUnitsCancelled / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | 0 ntn_RestrictedStockUnitsCancelled / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
RSU's outstanding, ending balance | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | 187,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
Balance exercisable | 0 ntn_RestrictedStockUnitsExercisable / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |
Weighted Average Fair Value per Share |  |
Weighted average fair value per share beginning balance | $ 0.14 ntn_RSUWeightedAverageFairValuePerShare / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | $ 0.14 ntn_RSUWeightedAverageFairValuePerShare / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
Weighted average fair value per share ending balance | $ 0 ntn_RSUWeightedAverageFairValuePerShare / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | $ 0.14 ntn_RSUWeightedAverageFairValuePerShare / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember

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- Details
Name: | ntn_OutstandingRestrictedStockUnits
Namespace Prefix: | ntn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition RSUs cancelled + References No definition available. + Details
Name: | ntn_RestrictedStockUnitsCancelled
Namespace Prefix: | ntn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Restricted stock units exercisable + References No definition available. + Details
Name: | ntn_RestrictedStockUnitsExercisable
Namespace Prefix: | ntn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition RSUs released + References No definition available. + Details
Name: | ntn_RestrictedStockUnitsReleased
Namespace Prefix: | ntn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition RSU weighted average fair value per share + References No definition available. + Details
Name: | ntn_RSUWeightedAverageFairValuePerShare
Namespace Prefix: | ntn_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | ntn_WeightedAverageFairValuePerShareRSU
Namespace Prefix: | ntn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of equity instruments other than options outstanding, including both vested and non-vested instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant