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Summary of Significant Accounting Policies (Details 6) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred revenues	$ 75	$ 1,248
Balances excluding revenue standard [Member]
Deferred revenues	213
Impact of Revenue Standard [Member]
Deferred revenues	$ (138)

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- Definition

Amount of deferred revenue, period increase (decrease).

+ References

No definition available.

+ Details

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Namespace Prefix:	neond_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

Name:	us-gaap_BalanceSheetLocationAxis=neond_BalancesExcludingRevenueStandardsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BalanceSheetLocationAxis=neond_ImpactOfRevenueStandardsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: