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

X

- Definition

Acquired intangible assets accumulated amortization.

+ References

No definition available.

+ Details

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X

- 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

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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

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X

- 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

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