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Goodwill and Intangible Assets - Future Amortization (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 28, 2015
Estimated future amortization expense  
2015 (remaining nine months) $ 1,258us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear
2016 1,656us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2017 206us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2018 140us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
2019 66us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Total future amortization expense $ 3,326nano_FiniteLivedIntangibleAssetsAmortizationExpenseEstimatedFutureAmount