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Stock Based Compensation (Details Textual) (USD $) | 0 Months Ended | 12 Months Ended | 0 Months Ended
--- | --- | --- | ---
Apr. 04, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 03, 2010
Stock-Based Compensation (Textual) |  |  |  |  |  |
Share-based compensation expense |  | $ 1,729,000 us-gaap_AllocatedShareBasedCompensationExpense | $ 2,656,000 us-gaap_AllocatedShareBasedCompensationExpense | $ 3,499,000 us-gaap_AllocatedShareBasedCompensationExpense |  |
Weighted average grant date fair value |  | $ 3.14 us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1 |  |  |  |
Options granted to purchase of common stock to employee |  | 10,000 neond_StockBasedCompensationOptionsGrantedToPurchaseOfCommonStockToEmployee |  | 360,000 neond_StockBasedCompensationOptionsGrantedToPurchaseOfCommonStockToEmployee |  |
Options granted to purchase of common stock to board members |  | 395,200 neond_StockBasedCompensationOptionsGrantedToPurchaseOfCommonStockToBoardMembers | 145,000 neond_StockBasedCompensationOptionsGrantedToPurchaseOfCommonStockToBoardMembers | 1,175,000 neond_StockBasedCompensationOptionsGrantedToPurchaseOfCommonStockToBoardMembers |  |
Stock based compensation options granted to purchase of common stock to employee fair value |  | 1,300,000 neond_StockBasedCompensationOptionsGrantedToPurchaseOfCommonStockToEmployeeFairValue | 748,000 neond_StockBasedCompensationOptionsGrantedToPurchaseOfCommonStockToEmployeeFairValue |  |  |
Placement agent fee |  | 600,000 neond_PlacementAgentFee |  |  |  |
Stock options vesting period description |  |  | The options have a 7-year life and 1/3 of the options are vested on the one year anniversary date of grant with the remaining to vest monthly over the remaining 24-months. |  |  |
Common stock issuable upon exercise of warrants |  |  |  | 235,144 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights |  |
Estimated fair value of the warrants | 166,000 us-gaap_FairValueAdjustmentOfWarrants |  |  |  |  |
Number of Options Outstanding |  | 1,709,400 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |  |  |  |
Number of shares vested and expected to vest |  | 54,060 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber |  |  |  |
Warrant [Member] |  |  |  |  |  |
Stock-Based Compensation (Textual) |  |  |  |  |  |
Share-based compensation expense |  | 38,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_StatementEquityComponentsAxis = us-gaap_WarrantMember | 26,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_StatementEquityComponentsAxis = us-gaap_WarrantMember | 91,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_StatementEquityComponentsAxis = us-gaap_WarrantMember |  |
Vesting period |  |  |  |  | 24 months | 24 months
Common stock issuable upon exercise of warrants |  | 10,053 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_StatementEquityComponentsAxis = us-gaap_WarrantMember | 1,384,719 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_StatementEquityComponentsAxis = us-gaap_WarrantMember |  | 20,000 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_StatementEquityComponentsAxis = us-gaap_WarrantMember | 120,000 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_StatementEquityComponentsAxis = us-gaap_WarrantMember
Exercise price of warrants per share |  |  |  |  | $ 3.90 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExercisePrice / us-gaap_StatementEquityComponentsAxis = us-gaap_WarrantMember | $ 1.63 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExercisePrice / us-gaap_StatementEquityComponentsAxis = us-gaap_WarrantMember
Estimated fair value of the warrants |  |  |  |  | $ 75,000 us-gaap_FairValueAdjustmentOfWarrants / us-gaap_StatementEquityComponentsAxis = us-gaap_WarrantMember | $ 198,000 us-gaap_FairValueAdjustmentOfWarrants / us-gaap_StatementEquityComponentsAxis = us-gaap_WarrantMember
Number of Options Outstanding |  | 3,355,073 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_StatementEquityComponentsAxis = us-gaap_WarrantMember | 828,573 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_StatementEquityComponentsAxis = us-gaap_WarrantMember | 4,704,636 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_StatementEquityComponentsAxis = us-gaap_WarrantMember | 5,405,606 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_StatementEquityComponentsAxis = us-gaap_WarrantMember |

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- Definition Placement agent fee. + References No definition available. + Details
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- Definition Stock based compensation options granted to purchase of common stock to board members. + References No definition available. + Details
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- Definition Stock based compensation options granted to purchase of common stock to employee. + References No definition available. + Details
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- Definition Stock Based Compensation Options Granted To Purchase Of Common Stock To Employee Fair Value. + References No definition available. + Details
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- Definition Stock Options Vesting Period Description. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Subparagraph 2 -Article 4 + Details
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- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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