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8. Concentrations of Risk (Details Narrative) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Risks and Uncertainties [Abstract]
Revenues from one customer	$ 7,648,000	$ 5,585,000
Accounts receivable from one customer	259,000	123,000
Accounts payable to one vendor	$ 32,000	$ 15,000

X

- Definition

Accounts payable to one vendor

+ References

No definition available.

+ Details

Name:	ntn_AccountsPayableToOneVendor
Namespace Prefix:	ntn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Accounts receivable from one customer

+ References

No definition available.

+ Details

Name:	ntn_AccountsReceivableFromOneCustomer
Namespace Prefix:	ntn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Revenues from one customer

+ References

No definition available.

+ Details

Name:	ntn_RevenuesFromOneCustomer
Namespace Prefix:	ntn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_RisksAndUncertaintiesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration