Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statements of Cash Flows [Abstract]
Net loss	$ (14,234)us-gaap_NetIncomeLoss	$ (13,080)us-gaap_NetIncomeLoss	$ (9,287)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	1,729us-gaap_ShareBasedCompensation	2,656us-gaap_ShareBasedCompensation	3,499us-gaap_ShareBasedCompensation
Bad debt expense	167us-gaap_ProvisionForDoubtfulAccounts
Depreciation and amortization	202	144	97
Loss on disposal of assets	16us-gaap_GainLossOnDispositionOfAssets1	8us-gaap_GainLossOnDispositionOfAssets1
Changes in operating assets and liabilities:
Accounts receivable	(304)	1,155	1,253
Projects in process	530neond_ProjectsInProcess	(736)neond_ProjectsInProcess
Prepaid expenses and other current assets	(60)	95	(296)
Accounts payable and accrued expenses	363	19	239
Deposits			(68)
Deferred revenues	(233)	938	819
Net cash used in operating activities	(11,824)	(8,801)	(3,744)
Cash flows used in investing activities:
Purchase of property and equipment	(115)	(155)	(310)
Proceeds from sale of property and equipment	7
Net cash used in investing activities	(108)	(155)	(310)
Cash flow from financing activities:
Proceeds from exercise of stock options		1,060
Proceeds from exercise of warrants	36us-gaap_ProceedsFromWarrantExercises	714us-gaap_ProceedsFromWarrantExercises	223us-gaap_ProceedsFromWarrantExercises
Proceeds from issuance of common stock, net of offering costs	9,253	6,892
Principal payments on capital lease obligation	(34)
Net cash provided by financing activities	9,255	8,666	223
Effect of exchange rates on cash	(9)	8	(12)
Net decrease in cash	(2,686)	(282)	(3,843)
Cash at beginning of year	8,815	9,097	12,940
Cash at end of year	6,129	8,815	9,097
Supplemental disclosure of cash flow information:
Cash paid for interest	14us-gaap_InterestPaid
Cash paid for income taxes	5us-gaap_IncomeTaxesPaid	109us-gaap_IncomeTaxesPaid	125us-gaap_IncomeTaxesPaid
Supplemental disclosure of non-cash investing and financing activities:
Purchase of equipment with capital lease obligation	$ 530

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