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Employee Benefit Plans (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Pension plans for Swedish employees [Member] |  |  |
Employee Benefit Plans (Textual) |  |  |
Defined benefit plan contribution, Amount | $ 249,000 us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = neond_PensionPlanForForeignCountryMember | $ 184,000 us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = neond_PensionPlanForForeignCountryMember | $ 139,500 us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = neond_PensionPlanForForeignCountryMember
Defined benefit plan contribution, Percentage | 5.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = neond_PensionPlanForForeignCountryMember | 5.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = neond_PensionPlanForForeignCountryMember | 5.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = neond_PensionPlanForForeignCountryMember
U.S. Employee 401K Pension Plan [Member] |  |  |
Employee Benefit Plans (Textual) |  |  |
Defined benefit plan contribution, Amount | $ 81,000 us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = neond_FourZeroOneKRetirementPlanMember | $ 66,000 us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = neond_FourZeroOneKRetirementPlanMember | $ 27,000 us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = neond_FourZeroOneKRetirementPlanMember
Matching contributions by employer | 6.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = neond_FourZeroOneKRetirementPlanMember | 6.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = neond_FourZeroOneKRetirementPlanMember | 6.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = neond_FourZeroOneKRetirementPlanMember

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- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum amount the employee may contribute to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
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- Details
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Data Type: | na
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- Details
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Data Type: | na
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