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Stockholders' Equity (Details Textual) - shares	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Stockholders' Equity [Abstract]
Warrants to purchase common stock outstanding	7,913,676	7,913,676

X

- Definition

The number of warrants to purchase common stock outstanding.

+ References

No definition available.

+ Details

Name:	neond_WarrantsToPurchaseOfCommonStock
Namespace Prefix:	neond_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_EquityAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration