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Segment Information and Concentrations of Risk (Details Textual)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Customer One [Member]
Segment Information and Concentrations of Risk (Textual) [Abstract]
Revenue Goods Net Percentage	63.00%	47.00%	60.00%	43.00%
Customer Two [Member]
Segment Information and Concentrations of Risk (Textual) [Abstract]
Revenue Goods Net Percentage	9.00%	19.00%	11.00%	20.00%
Customer Three [Member]
Segment Information and Concentrations of Risk (Textual) [Abstract]
Revenue Goods Net Percentage	5.00%	12.00%	6.00%	12.00%

X

- Definition

Revenue goods net percentage.

+ References

No definition available.

+ Details

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Namespace Prefix:	nvtl_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	nvtl_SegmentInformationAndConcentrationsOfRiskTextualAbstract
Namespace Prefix:	nvtl_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration