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Nature of the Business and Operations (Details Textual) (USD $) | 0 Months Ended | 3 Months Ended | 12 Months Ended
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Apr. 04, 2013 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Nature of the Business and Operations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  | $ (3,107,000)us-gaap_NetIncomeLoss | $ (3,245,000)us-gaap_NetIncomeLoss | $ (3,874,000)us-gaap_NetIncomeLoss | $ (4,008,000)us-gaap_NetIncomeLoss | $ (3,047,000)us-gaap_NetIncomeLoss | $ (3,343,000)us-gaap_NetIncomeLoss | $ (3,120,000)us-gaap_NetIncomeLoss | $ (3,570,000)us-gaap_NetIncomeLoss | $ (2,128,000)us-gaap_NetIncomeLoss | $ (2,144,000)us-gaap_NetIncomeLoss | $ (3,427,000)us-gaap_NetIncomeLoss | $ (1,588,000)us-gaap_NetIncomeLoss | $ (14,234,000)us-gaap_NetIncomeLoss | $ (13,080,000)us-gaap_NetIncomeLoss | $ (9,287,000)us-gaap_NetIncomeLoss
Accumulated deficit |  | (165,929,000)us-gaap_RetainedEarningsAccumulatedDeficit |  |  |  | (151,695,000)us-gaap_RetainedEarningsAccumulatedDeficit |  |  |  |  |  |  |  | (165,929,000)us-gaap_RetainedEarningsAccumulatedDeficit | (151,695,000)us-gaap_RetainedEarningsAccumulatedDeficit |
Net cash used in operating activities |  |  |  |  |  |  |  |  |  |  |  |  |  | (11,824,000)us-gaap_NetCashProvidedByUsedInOperatingActivities | (8,801,000)us-gaap_NetCashProvidedByUsedInOperatingActivities | (3,744,000)us-gaap_NetCashProvidedByUsedInOperatingActivities
Proceeds from issuance of warrants | 40,000 us-gaap_ProceedsFromIssuanceOfWarrants |  |  |  |  |  |  |  |  |  |  |  |  | 12,725,000 us-gaap_ProceedsFromIssuanceOfWarrants |  | 168,668 us-gaap_ProceedsFromIssuanceOfWarrants
Warrants issued to purchase shares of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,500,000 neond_PurchaseOfCommonStockByWarrantIssued |  | 361,000 neond_PurchaseOfCommonStockByWarrantIssued
Exercise price | $ 1.00 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 | $ 5.09 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 |  |  |  |  |  |  |  | $ 1.38 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 |  |  |  | $ 5.09 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 |  | $ 1.38 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Placement agent fee |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 600,000 neond_PlacementAgentFee |  |
Warrants issued to placement agent |  |  |  |  |  |  |  |  |  |  |  |  |  | 75,000 neond_WarrantsIssuedToPlacementAgent |  |
Number of stock issued |  |  |  | 5,000,000 neond_StockIssuedDuringPeriodSharesFutureOffering |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + 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)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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