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Cash and Investments - Additional Information (Details) | 6 Months Ended | 12 Months Ended
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Jun. 30, 2018 | Dec. 30, 2017
Investments Debt And Equity Securities [Abstract] |  |
Investment maturity period, less than | 39 months | 24 months

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- Definition Investment maturity period, maximum. + References No definition available. + Details
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Namespace Prefix: | nano_
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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration