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

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- Definition Product Warranty, Period + References No definition available. + Details
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Namespace Prefix: | nlst_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |