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Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data | Total | Series A Preferred Stock | Series B Preferred Stock | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Income | Accumulated Deficit
--- | --- | --- | --- | --- | --- | --- | ---
Beginning Balances at Dec. 31, 2011 | $ 13,673 us-gaap_StockholdersEquity |  |  | $ 33 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 142,955 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 13 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (129,328)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherComprehensiveIncomeMember
Beginning Balances, Shares at Dec. 31, 2011 |  |  |  | 32,779 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Stock option and warrant compensation expense to employees | 3,499 neond_StockIssuedDuringPeriodValueEmployeeStockOptionAndWarrantCompensationExpense |  |  |  | 3,499 neond_StockIssuedDuringPeriodValueEmployeeStockOptionAndWarrantCompensationExpense / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Common stock issued upon exercise of common stock warrants | 223 neond_CommonStockIssuedUponExerciseOfCommonStockWarrants |  |  |  | 223 neond_CommonStockIssuedUponExerciseOfCommonStockWarrants / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Common stock issued upon exercise of common stock warrants, shares |  |  |  | 550 neond_CommonStockIssuedUponExerciseOfCommonStockWarrantsShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Exchange of Series B preferred stock for common stock, shares |  |  |  | 2 neond_ExchangeOfSeriesBPreferredStockForCommonStockShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Foreign currency translation adjustment | (8)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax |  |  |  |  | (8)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Net loss | (9,287)us-gaap_NetIncomeLoss |  |  |  |  |  | (9,287)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherComprehensiveIncomeMember
Ending Balances at Dec. 31, 2012 | 8,100 us-gaap_StockholdersEquity |  |  | 33 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 146,677 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 5 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (138,615)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherComprehensiveIncomeMember
Ending Balances, shares at Dec. 31, 2012 |  |  |  | 33,331 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Stock option and warrant compensation expense to employees, directors and vendors | 2,656 neond_StockOptionAndWarrantCompensationExpenseToEmployeesDirectorsAndVendors |  |  |  | 2,656 neond_StockOptionAndWarrantCompensationExpenseToEmployeesDirectorsAndVendors / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Proceeds from sale of common stock, net of offering costs | 6,892 us-gaap_StockIssuedDuringPeriodValueNewIssues |  |  | 2 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 6,890 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Proceeds from sale of common stock, net of offering costs, shares |  |  |  | 1,169 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Common stock issued upon exercise of common stock warrants | 714 neond_CommonStockIssuedUponExerciseOfCommonStockWarrants |  |  | 3 neond_CommonStockIssuedUponExerciseOfCommonStockWarrants / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 711 neond_CommonStockIssuedUponExerciseOfCommonStockWarrants / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Common stock issued upon exercise of common stock warrants, shares |  |  |  | 3,152 neond_CommonStockIssuedUponExerciseOfCommonStockWarrantsShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Exchange of Series A preferred stock for common stock,shares |  |  |  | 40 neond_ExchangeofSeriesPreferredStockForCommonStockShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Exchange of Series B preferred stock for common stock, shares |  |  |  | 1 neond_ExchangeOfSeriesBPreferredStockForCommonStockShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Common stock issued upon exercise of common stock options | 1,060 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised |  |  |  | 1,060 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Common stock issued upon exercise of common stock options, shares |  |  |  | 241 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Foreign currency translation adjustment | 6 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax |  |  |  |  | 6 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Net loss | (13,080)us-gaap_NetIncomeLoss |  |  |  |  |  | (13,080)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherComprehensiveIncomeMember
Ending Balances at Dec. 31, 2013 | 6,348 us-gaap_StockholdersEquity |  |  | 38 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 157,994 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 11 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (151,695)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherComprehensiveIncomeMember
Ending Balances, shares at Dec. 31, 2013 |  |  |  | 37,934 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Stock based compensation expense to employees, directors and vendors | 1,729 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount |  |  |  | 1,729 us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Proceeds from sale of common stock, net of offering costs | 9,253 us-gaap_StockIssuedDuringPeriodValueNewIssues |  |  | 2 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 9,251 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Proceeds from sale of common stock, net of offering costs, shares |  |  |  | 2,500 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Common stock issued upon exercise of common stock warrants | 36 neond_CommonStockIssuedUponExerciseOfCommonStockWarrants |  |  |  | 36 neond_CommonStockIssuedUponExerciseOfCommonStockWarrants / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Common stock issued upon exercise of common stock warrants, shares |  |  |  | 21 neond_CommonStockIssuedUponExerciseOfCommonStockWarrantsShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Foreign currency translation adjustment | 138 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax |  |  |  |  | 138 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Net loss | (14,234)us-gaap_NetIncomeLoss |  |  |  |  |  | (14,234)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherComprehensiveIncomeMember
Ending Balances at Dec. 31, 2014 | $ 3,270 us-gaap_StockholdersEquity |  |  | $ 40 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 169,010 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 149 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (165,929)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherComprehensiveIncomeMember
Ending Balances, shares at Dec. 31, 2014 |  |  |  | 40,455 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |

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