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Employee Benefit Plans (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Pension plans for Swedish employees [Member]
Employee Benefit Plans (Textual)
Defined benefit plan contribution, Amount	$ 249,000us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = neond_PensionPlanForForeignCountryMember	$ 184,000us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = neond_PensionPlanForForeignCountryMember	$ 139,500us-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	$ 81,000us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = neond_FourZeroOneKRetirementPlanMember	$ 66,000us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = neond_FourZeroOneKRetirementPlanMember	$ 27,000us-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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- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

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- Definition

Maximum amount the employee may contribute to a defined contribution plan.

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- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

+ References

No definition available.

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