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Income Taxes - Textual (Details) (USD $) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 27, 2014 | Dec. 28, 2013 | Dec. 29, 2012 | Dec. 31, 2011
Income Taxes (Textual) [Abstract] |  |  |  |
Excess benefits due to stock option exercise |  | $ 0 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions |  |
Change in amount of operating loss carryforwards valuation allowance | 23,900,000 nano_OperatingLossCarryforwardsValuationAllowanceIncreaseDecreaseInAmount | 1,400,000 nano_OperatingLossCarryforwardsValuationAllowanceIncreaseDecreaseInAmount |  |
Undistributed earnings from non-U.S. operations | 1,000,000 us-gaap_UndistributedEarningsOfForeignSubsidiaries |  |  |
Maximum amount company recognize from unrecognized tax benefit | 6,442,000 us-gaap_UnrecognizedTaxBenefits | 4,436,000 us-gaap_UnrecognizedTaxBenefits | 3,464,000 us-gaap_UnrecognizedTaxBenefits | 3,599,000 us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefits that would impact effective tax rate if recognized | 700,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | 21,100,000 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount |  |  |
Federal [Member] |  |  |  |
Income Taxes (Textual) [Abstract] |  |  |  |
Operating loss carryforwards | 13,400,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember |  |  |
State research and experimental tax credit carryforward | 6,200,000 us-gaap_TaxCreditCarryforwardAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember |  |  |
Federal [Member] | Excess Tax Benefit Related to Exercise of Stock Option [Member] |  |  |  |
Income Taxes (Textual) [Abstract] |  |  |  |
Operating loss carryforwards | 200,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember / us-gaap_TaxCreditCarryforwardAxis = nano_ExcessTaxBenefitRelatedtoExerciseofStockOptionMember |  |  |
California [Member] |  |  |  |
Income Taxes (Textual) [Abstract] |  |  |  |
Operating loss carryforwards | 45,000,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |  |
State research and experimental tax credit carryforward | 5,700,000 us-gaap_TaxCreditCarryforwardAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |  |
California [Member] | Excess Tax Benefit Related to Exercise of Stock Option [Member] |  |  |  |
Income Taxes (Textual) [Abstract] |  |  |  |
Operating loss carryforwards | 3,000,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember / us-gaap_TaxCreditCarryforwardAxis = nano_ExcessTaxBenefitRelatedtoExerciseofStockOptionMember |  |  |
State research and experimental tax credit carryforward | 200,000 us-gaap_TaxCreditCarryforwardAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember / us-gaap_TaxCreditCarryforwardAxis = nano_ExcessTaxBenefitRelatedtoExerciseofStockOptionMember |  |  |
Foreign Tax Authority [Member] |  |  |  |
Income Taxes (Textual) [Abstract] |  |  |  |
Operating loss carryforwards | 36,300,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |  |  |
Foreign Tax Authority [Member] | Excess Tax Benefit Related to Exercise of Stock Option [Member] |  |  |  |
Income Taxes (Textual) [Abstract] |  |  |  |
Operating loss carryforwards | $ 1,700,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_TaxCreditCarryforwardAxis = nano_ExcessTaxBenefitRelatedtoExerciseofStockOptionMember |  |  |

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- Definition Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Carryforwards -URI http://asc.fasb.org/extlink&oid=6506874 + Details
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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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