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Income Taxes (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax (Textual)      
Interest or penalties related to unrecognized tax benefits $ 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense $ 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense $ 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense
Accrued interest and penalties related to uncertain tax 0neond_AccruedInterestAndPenaltiesRelatedToUncertainTax 0neond_AccruedInterestAndPenaltiesRelatedToUncertainTax  
Uncertain tax positions 0us-gaap_LiabilityForUncertainTaxPositionsCurrent    
Description of income tax withholding Payments related to the license agreement with Sony Corporation are net of 10% income tax withholding as required by the Japanese government under the Sweden and Japan international tax treaty.    
Amount withheld to offset future tax income tax payable 0neond_AmountWithheldToOffsetFutureTaxLiability 42,000neond_AmountWithheldToOffsetFutureTaxLiability 123,000neond_AmountWithheldToOffsetFutureTaxLiability
Open tax years 1998 through 2013    
Federal [Member]      
Income Tax (Textual)      
Operating loss carryforwards 41,700,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		    
Operating loss carryforwards, expiration date Dec. 31, 2028    
Deferred tax assets related to excess tax benefits for stock based compensation 533,000us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		    
State [Member]      
Income Tax (Textual)      
Operating loss carryforwards 16,100,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		    
Operating loss carryforwards, expiration date Dec. 31, 2020    
Deferred tax assets related to excess tax benefits for stock based compensation 27,000us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		    
Foreign [Member]      
Income Tax (Textual)      
Operating loss carryforwards $ 0us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember