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Intangible Assets - Additional Information (Detail) (USD $) | Mar. 31, 2014 | Dec. 31, 2013
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Finite-Lived Intangible Assets [Line Items] |  |
Purchased intangible assets net | $ 1,879,000 | $ 2,131,000
Intangible assets accumulated amortization | 13,235,000 | 12,983,000
Acquired software licenses [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Purchased intangible assets net | 84,000 | 112,000
Intangible assets accumulated amortization | $ 2,300,000 | $ 2,200,000

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- Definition Acquired intangible assets accumulated amortization. + References No definition available. + Details
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Namespace Prefix: | nvtl_
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Balance Type: | credit
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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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