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Segment Information and Concentrations of Risk - Schedule of Geographic Concentration of Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Assets by Geographic Concentration, Total	$ 95,020us-gaap_Assets	$ 111,465us-gaap_Assets
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Assets by Geographic Concentration, Total	91,843us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_US	108,932us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_US
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Assets by Geographic Concentration, Total	587us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_CA	808us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_CA
Europe, Latin America and Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Assets by Geographic Concentration, Total	$ 2,590us-gaap_Assets / us-gaap_StatementGeographicalAxis = nvtl_EuropeLatinAmericaAndAsiaMember	$ 1,725us-gaap_Assets / us-gaap_StatementGeographicalAxis = nvtl_EuropeLatinAmericaAndAsiaMember

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.18)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 12

-Article 7



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 18

-Article 5

+ Details

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- Details

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- Details

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- Details

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