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Intangible Assets - Summary of Amortization Expenses of Purchased Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization of purchased intangible assets | $ 562 us-gaap_AmortizationOfIntangibleAssets | $ 562 us-gaap_AmortizationOfIntangibleAssets | $ 1,074 us-gaap_AmortizationOfIntangibleAssets
Cost of net revenues |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization of purchased intangible assets | 333 us-gaap_AmortizationOfIntangibleAssets / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 334 us-gaap_AmortizationOfIntangibleAssets / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember |
General and administrative expenses |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization of purchased intangible assets | 562 us-gaap_AmortizationOfIntangibleAssets / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember | 562 us-gaap_AmortizationOfIntangibleAssets / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember |
Total amortization expense |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization of purchased intangible assets | $ 895 us-gaap_AmortizationOfIntangibleAssets / us-gaap_IncomeStatementLocationAxis = nvtl_AmortizationExpenseMember | $ 896 us-gaap_AmortizationOfIntangibleAssets / us-gaap_IncomeStatementLocationAxis = nvtl_AmortizationExpenseMember |

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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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- Details
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- Details
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- Details
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