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Segment Information and Concentrations of Risk (Details Textual) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Customer One [Member] |  |  |
Segment Information and Concentrations of Risk (Textual) [Abstract] |  |  |
Net Revenue, Percentage | 57.50% | 50.80% | 55.70%
Total accounts receivable | 20.70% | 46.50% |
Customer Two [Member] |  |  |
Segment Information and Concentrations of Risk (Textual) [Abstract] |  |  |
Net Revenue, Percentage |  | 13.10% | 21.80%
Total accounts receivable | 18.50% | 19.80% |
Customer Three [Member] |  |  |
Segment Information and Concentrations of Risk (Textual) [Abstract] |  |  |
Total accounts receivable | 11.50% |  |

X
- Definition Entity wide receivables major customer percentage. + References No definition available. + Details
Name: | nvtl_EntityWideReceivablesMajorCustomerPercentage
Namespace Prefix: | nvtl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues. + References No definition available. + Details
Name: | us-gaap_EntityWideRevenueMajorCustomerPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration