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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
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Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Assets by Geographic Concentration, Total | $ 95,020 us-gaap_Assets | $ 111,465 us-gaap_Assets
United States |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Assets by Geographic Concentration, Total | 91,843 us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_US | 108,932 us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_US
Canada |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Assets by Geographic Concentration, Total | 587 us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_CA | 808 us-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 | $ 2,590 us-gaap_Assets / us-gaap_StatementGeographicalAxis = nvtl_EuropeLatinAmericaAndAsiaMember | $ 1,725 us-gaap_Assets / us-gaap_StatementGeographicalAxis = nvtl_EuropeLatinAmericaAndAsiaMember

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- 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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