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4. Goodwill and Other Intangible Assets (Details-Intangible Assets) (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Gross Carrying Value | $ 1,036,000 us-gaap_FiniteLivedIntangibleAssetsGross | $ 2,804,000 us-gaap_FiniteLivedIntangibleAssetsGross
Accumulated Amortization | (907,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | (2,644,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Net Book Value | 129,000 us-gaap_FiniteLivedIntangibleAssetsNet | 160,000 us-gaap_FiniteLivedIntangibleAssetsNet
Acquired Technology |  |
Gross Carrying Value | 150,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ntn_AcquiredTechnologyMember | 599,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ntn_AcquiredTechnologyMember
Accumulated Amortization | (21,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ntn_AcquiredTechnologyMember | (559,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ntn_AcquiredTechnologyMember
Net Book Value | 129,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ntn_AcquiredTechnologyMember | 40,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ntn_AcquiredTechnologyMember
Acquired Customer Lists |  |
Gross Carrying Value | 435,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ntn_AcquiredCustomerListsMember | 545,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ntn_AcquiredCustomerListsMember
Accumulated Amortization | (435,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ntn_AcquiredCustomerListsMember | (425,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ntn_AcquiredCustomerListsMember
Net Book Value | 120,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ntn_AcquiredCustomerListsMember | 120,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ntn_AcquiredCustomerListsMember
Trivia Database |  |
Gross Carrying Value | 384,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ntn_TriviaDatabaseMember | 417,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ntn_TriviaDatabaseMember
Accumulated Amortization | (384,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ntn_TriviaDatabaseMember | (417,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ntn_TriviaDatabaseMember
Net Book Value | 0 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ntn_TriviaDatabaseMember | 0 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ntn_TriviaDatabaseMember
Trademarks And Trademark Licenses |  |
Gross Carrying Value | 67,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ntn_TrademarksAndTrademarkLicensesMember | 67,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ntn_TrademarksAndTrademarkLicensesMember
Accumulated Amortization | (67,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ntn_TrademarksAndTrademarkLicensesMember | (67,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ntn_TrademarksAndTrademarkLicensesMember
Net Book Value | 0 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ntn_TrademarksAndTrademarkLicensesMember | 0 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ntn_TrademarksAndTrademarkLicensesMember
Acquired Subscription Customers |  |
Gross Carrying Value | 0 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ntn_AcquiredSubscriptionCustomersMember | 874,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ntn_AcquiredSubscriptionCustomersMember
Accumulated Amortization | 0 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ntn_AcquiredSubscriptionCustomersMember | (874,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ntn_AcquiredSubscriptionCustomersMember
Net Book Value | 0 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ntn_AcquiredSubscriptionCustomersMember | 0 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ntn_AcquiredSubscriptionCustomersMember
Acquired Advertising Customers |  |
Gross Carrying Value | 0 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ntn_AcquiredAdvertisingCustomersMember | 302,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ntn_AcquiredAdvertisingCustomersMember
Accumulated Amortization | 0 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ntn_AcquiredAdvertisingCustomersMember | (302,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ntn_AcquiredAdvertisingCustomersMember
Net Book Value | $ 0 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ntn_AcquiredAdvertisingCustomersMember | $ 0 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = ntn_AcquiredAdvertisingCustomersMember

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