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Income Taxes - Income Tax Rate Reconciliation (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 27, 2014 | Dec. 28, 2013 | Dec. 29, 2012
Income Tax Reconciliation: |  |  |
Income taxes computed at U.S. statutory rate | $ (4,067)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ (8,247)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ 1,616 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State income taxes | 254 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | (324)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | (116)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Foreign tax rate differential | (172)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential | 9 us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential | (275)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Change in valuation allowance | 23,126 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | 0 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | 0 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Domestic production activities deduction | 0 us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities | 0 us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities | (17)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities
Tax credits | (561)us-gaap_IncomeTaxReconciliationTaxCredits | (1,377)us-gaap_IncomeTaxReconciliationTaxCredits | 0 us-gaap_IncomeTaxReconciliationTaxCredits
Benefit of tax elections | 0 nano_IncomeTaxReconciliationBenefitOfTaxElections | 0 nano_IncomeTaxReconciliationBenefitOfTaxElections | (1,309)nano_IncomeTaxReconciliationBenefitOfTaxElections
Liabilities for uncertain tax positions | 118 nano_IncomeTaxReconciliationLiabilitiesForUncertainTaxPositions | 111 nano_IncomeTaxReconciliationLiabilitiesForUncertainTaxPositions | 66 nano_IncomeTaxReconciliationLiabilitiesForUncertainTaxPositions
Other, net | 799 us-gaap_IncomeTaxReconciliationOtherAdjustments | 409 us-gaap_IncomeTaxReconciliationOtherAdjustments | 189 us-gaap_IncomeTaxReconciliationOtherAdjustments
Provision (benefit) for income taxes | $ 19,497 us-gaap_IncomeTaxExpenseBenefit | $ (9,419)us-gaap_IncomeTaxExpenseBenefit | $ 154 us-gaap_IncomeTaxExpenseBenefit

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- Definition Income Tax Reconciliation, Benefit of Tax Elections + References No definition available. + Details
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- Definition Income Tax Reconciliation, Liabilities for Uncertain Tax Positions + References No definition available. + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e32123-109318 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign income tax expense (benefit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 1 -Article 4 + Details
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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