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