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Summary of Significant Accounting Policies (Warranty Liability) (Details)	6 Months Ended
	Jun. 30, 2018
Minimum
Product warranty period	1 year
Maximum
Product warranty period	3 years

X

- Definition

Product Warranty, Period

+ References

No definition available.

+ Details

Name:	nlst_ProductWarrantyPeriod
Namespace Prefix:	nlst_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: