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Stockholders' Equity and Stock-Based Compensation - Textual (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 28, 2015
Mar. 29, 2014
Mar. 27, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options awarded (in shares) 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross    
Weighted average fair value per share of stock options (in dollars per share)   $ 8.69us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue  
Closing stock price (in dollars per share)     $ 17.19nano_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsShareClosingPrice
Intrinsic value of options exercised $ 0.8us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue $ 1.7us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue  
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected dividends 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
   
Performance-Based Restricted Stock Units (PSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected dividends 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
   
Number of shares that will vest if target stock price performance is achieved 40,000nano_ScheduleofSharebasedCompensationArrangementbySharebasedPaymentAwardNumberofSharesToVestIfTargetIsAchieved
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
   
Number of shares that will vest if maximum stock price performance is achieved 60,000nano_ScheduleofSharebasedCompensationArrangementbySharebasedPaymentAwardNumberofSharesToVestIfMaximumStockPricePerformanceIsAchieved
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
   
Performance-Based Restricted Stock Units (PSUs) [Member] | Tranche One [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 1 year    
Performance-Based Restricted Stock Units (PSUs) [Member] | Tranche Two [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 2 years    
Performance-Based Restricted Stock Units (PSUs) [Member] | Tranche Three [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years