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Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified | Total | Common Stock | Additional Paid-in Capital | Treasury Stock | Accumulated Deficit | Accumulated Other Comprehensive Income (Loss)
--- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2011 | $ 166,025 us-gaap_StockholdersEquity | $ 32 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 429,813 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ (25,000)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ (238,812)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (8)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Beginning Balance, shares at Dec. 31, 2011 |  | 32,262,000 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Exercise of stock options, vesting of restricted stock units and shares issued under employee stock purchase plan, shares |  | 1,393,000 nvtl_StockIssuedDuringPeriodSharesExerciseOfStockOptionsVestingOfRestrictedStockUnitsAndEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Exercise of stock options, vesting of restricted stock units and shares issued under employee stock purchase plan | 1,599 nvtl_StockIssuedDuringPeriodValueExerciseOfStockOptionsVestingOfRestrictedStockUnitsAndEmployeeStockPurchasePlan | 2 nvtl_StockIssuedDuringPeriodValueExerciseOfStockOptionsVestingOfRestrictedStockUnitsAndEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,597 nvtl_StockIssuedDuringPeriodValueExerciseOfStockOptionsVestingOfRestrictedStockUnitsAndEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Taxes withheld on net settled vesting of restricted stock units | (433)nvtl_TaxesWithheldOnNetSettledVestingOfRestrictedStockUnits |  | (433)nvtl_TaxesWithheldOnNetSettledVestingOfRestrictedStockUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Share-based compensation | 7,500 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  | 7,500 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Net loss | (89,266)us-gaap_NetIncomeLoss |  |  |  | (89,266)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Other comprehensive income (loss) | 22 us-gaap_OtherComprehensiveIncomeLossNetOfTax |  |  |  |  | 22 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Ending Balance at Dec. 31, 2012 | 85,447 us-gaap_StockholdersEquity | 34 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 438,477 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (25,000)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (328,078)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 14 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Ending Balance, shares at Dec. 31, 2012 |  | 33,655,000 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Exercise of stock options, vesting of restricted stock units and shares issued under employee stock purchase plan, shares |  | 442,000 nvtl_StockIssuedDuringPeriodSharesExerciseOfStockOptionsVestingOfRestrictedStockUnitsAndEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Exercise of stock options, vesting of restricted stock units and shares issued under employee stock purchase plan | 102 nvtl_StockIssuedDuringPeriodValueExerciseOfStockOptionsVestingOfRestrictedStockUnitsAndEmployeeStockPurchasePlan | 0 nvtl_StockIssuedDuringPeriodValueExerciseOfStockOptionsVestingOfRestrictedStockUnitsAndEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 102 nvtl_StockIssuedDuringPeriodValueExerciseOfStockOptionsVestingOfRestrictedStockUnitsAndEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Taxes withheld on net settled vesting of restricted stock units | (654)nvtl_TaxesWithheldOnNetSettledVestingOfRestrictedStockUnits |  | (654)nvtl_TaxesWithheldOnNetSettledVestingOfRestrictedStockUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Share-based compensation | 3,443 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  | 3,443 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Net loss | (43,413)us-gaap_NetIncomeLoss |  |  |  | (43,413)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Other comprehensive income (loss) | (9)us-gaap_OtherComprehensiveIncomeLossNetOfTax |  |  |  |  | (9)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Ending Balance at Dec. 31, 2013 | 44,916 us-gaap_StockholdersEquity | 34 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 441,368 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (25,000)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (371,491)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 5 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Ending Balance, shares at Dec. 31, 2013 |  | 34,097,000 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Exercise of stock options, vesting of restricted stock units and shares issued under employee stock purchase plan, shares |  | 689,000 nvtl_StockIssuedDuringPeriodSharesExerciseOfStockOptionsVestingOfRestrictedStockUnitsAndEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Exercise of stock options, vesting of restricted stock units and shares issued under employee stock purchase plan | 248 nvtl_StockIssuedDuringPeriodValueExerciseOfStockOptionsVestingOfRestrictedStockUnitsAndEmployeeStockPurchasePlan | 2 nvtl_StockIssuedDuringPeriodValueExerciseOfStockOptionsVestingOfRestrictedStockUnitsAndEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 246 nvtl_StockIssuedDuringPeriodValueExerciseOfStockOptionsVestingOfRestrictedStockUnitsAndEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Issuance of common shares in litigation settlement (in shares) |  | 2,407,000 nvtl_StockIssuedDuringPeriodSharesLitigationSettlement / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Issuance of common shares in connection with litigation settlement | 5,000 nvtl_StockIssuedDuringPeriodValueLitigationSettlement | 2 nvtl_StockIssuedDuringPeriodValueLitigationSettlement / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 4,998 nvtl_StockIssuedDuringPeriodValueLitigationSettlement / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Issuance of common shares in HC2 financing transaction (in shares) |  | 7,363,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Issuance of common shares in connection with financing transaction, net of issuance costs | 7,936 us-gaap_StockIssuedDuringPeriodValueNewIssues | 7 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 7,929 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Taxes withheld on net settled vesting of restricted stock units | (1,067)nvtl_TaxesWithheldOnNetSettledVestingOfRestrictedStockUnits |  | (1,067)nvtl_TaxesWithheldOnNetSettledVestingOfRestrictedStockUnits / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Issuance of common shares for conversion of Series C Preferred Shares (in shares) |  | 872,000 us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Issuance of common shares in connection with the conversion of Series C preferred shares | 940 us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities | 1 us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 939 us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Beneficial conversion feature of convertible Series C preferred shares | 445 nvtl_AdjustmenttoPaidinCapitalBeneficialConversionFeature |  | 445 nvtl_AdjustmenttoPaidinCapitalBeneficialConversionFeature / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Reclassification of warrant liability | 8,219 us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued |  | 8,219 us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Share-based compensation (in shares) |  | 314,000 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Share-based compensation | 3,588 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue |  | 3,588 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Net loss | (39,674)us-gaap_NetIncomeLoss |  |  |  | (39,674)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |
Other comprehensive income (loss) | (5)us-gaap_OtherComprehensiveIncomeLossNetOfTax |  |  |  |  | (5)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Ending Balance at Dec. 31, 2014 | $ 30,546 us-gaap_StockholdersEquity | $ 46 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 466,665 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ (25,000)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ (411,165)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 0 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember
Ending Balance, shares at Dec. 31, 2014 |  | 45,742,000 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |

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