XML 46 R36.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Cash and Investments - Additional Information (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 01, 2017 | Dec. 31, 2016
Investments Debt And Equity Securities [Abstract] |  |
Investment maturity period, less than | 2 years | 2 years

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

X
- References No definition available. + Details
Name: | us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration