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7. CONCENTRATIONS OF RISK (Details Narrative) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Accounts receivable from customer	$ 645us-gaap_AccountsReceivableNet		$ 2,190us-gaap_AccountsReceivableNet
Purchase commitment	52us-gaap_PurchaseObligationFutureMinimumPaymentsRemainderOfFiscalYear		423us-gaap_PurchaseObligationFutureMinimumPaymentsRemainderOfFiscalYear
Revenues | One Customer
Revenues	2,389us-gaap_SalesRevenueNet / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SalesMember / us-gaap_MajorCustomersAxis = ntn_OneCustomerMember	2,646us-gaap_SalesRevenueNet / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SalesMember / us-gaap_MajorCustomersAxis = ntn_OneCustomerMember
Concentration risk percentage	42.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SalesMember / us-gaap_MajorCustomersAxis = ntn_OneCustomerMember	41.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SalesMember / us-gaap_MajorCustomersAxis = ntn_OneCustomerMember
Accounts Receivable | One Customer
Accounts receivable from customer	$ 177us-gaap_AccountsReceivableNet / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_AccountsReceivableMember / us-gaap_MajorCustomersAxis = ntn_OneCustomerMember		$ 1,558us-gaap_AccountsReceivableNet / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_AccountsReceivableMember / us-gaap_MajorCustomersAxis = ntn_OneCustomerMember

X

- Definition

For an unclassified balance sheet, the amount due from customers or clients for goods or services that have been delivered or sold in the normal course of business, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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X

- Definition

Minimum amount of purchase arrangement maturing in the remainder of the fiscal year following the latest fiscal year ended. Includes, but is not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments.

+ References

No definition available.

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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