XML 48 R56.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Stockholders' Equity - Summary of Common Shares Reserved for Future Issuance (Detail) | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total shares of common stock reserved for issuance | 14,660,000 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance | 10,209,000 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
Stock options outstanding under the 2009 Omnibus Incentive Compensation Plan and previous plans |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total shares of common stock reserved for issuance | 3,065,000 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 3,933,000 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Restricted stock units outstanding |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total shares of common stock reserved for issuance | 1,629,000 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | 1,108,000 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
Future grants of awards under the 2009 Omnibus Incentive Compensation Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total shares of common stock reserved for issuance | 4,463,000 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_AwardTypeAxis = nvtl_FutureGrantsOfAwardMember | 3,668,000 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_AwardTypeAxis = nvtl_FutureGrantsOfAwardMember
Shares available under the Employee Stock Purchase Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total shares of common stock reserved for issuance | 1,385,000 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_AwardTypeAxis = nvtl_EmployeeStockPurchasePlansMember | 1,500,000 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_AwardTypeAxis = nvtl_EmployeeStockPurchasePlansMember
Common stock warrants outstanding |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total shares of common stock reserved for issuance | 4,118,000 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_ClassOfWarrantOrRightAxis = us-gaap_WarrantMember | 0 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_ClassOfWarrantOrRightAxis = us-gaap_WarrantMember

X
- Definition Aggregate number of common shares reserved for future issuance. + 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 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AwardTypeAxis=nvtl_EmployeeStockPurchasePlansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=nvtl_FutureGrantsOfAwardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=us-gaap_WarrantMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |