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Intangible Assets - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items] |  |  |
Purchased intangible assets net | $ 1,493,000 us-gaap_IntangibleAssetsNetExcludingGoodwill | $ 2,131,000 us-gaap_IntangibleAssetsNetExcludingGoodwill |
Intangible assets accumulated amortization | 14,050,000 nvtl_AcquiredIntangibleAssetsAccumulatedAmortization | 12,983,000 nvtl_AcquiredIntangibleAssetsAccumulatedAmortization |
Impairment loss | 0 us-gaap_GoodwillAndIntangibleAssetImpairment | 0 us-gaap_GoodwillAndIntangibleAssetImpairment | 49,521,000 us-gaap_GoodwillAndIntangibleAssetImpairment
Amortization expense | 562,000 us-gaap_AmortizationOfIntangibleAssets | 562,000 us-gaap_AmortizationOfIntangibleAssets | 1,074,000 us-gaap_AmortizationOfIntangibleAssets
Weighted average remaining useful life of long-lived intangible assets | 2 years |  |
Acquired software licenses |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Purchased intangible assets net | 369,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember | 112,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember |
Intangible assets accumulated amortization | 2,400,000 nvtl_AcquiredIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember | 2,200,000 nvtl_AcquiredIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember |
Amortization expense | 173,000 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember | 113,000 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember | 196,000 us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_LicensingAgreementsMember
Intangible assets |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Impairment loss | $ 0 us-gaap_GoodwillAndIntangibleAssetImpairment / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_FiniteLivedIntangibleAssetsMember |  | $ 49,500,000 us-gaap_GoodwillAndIntangibleAssetImpairment / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_FiniteLivedIntangibleAssetsMember

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- Definition Acquired intangible assets accumulated amortization. + References No definition available. + Details
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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill. + References No definition available. + Details
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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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