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Summary of Significant Accounting Policies (Details) (USD $) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 27, 2014 | Sep. 27, 2014 | Jun. 28, 2014 | Mar. 29, 2014 | Dec. 28, 2013 | Sep. 28, 2013 | Jun. 29, 2013 | Mar. 30, 2013 | Dec. 27, 2014 | Dec. 28, 2013 | Dec. 29, 2012 | Dec. 31, 2011 | Mar. 14, 2013
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Comprehensive Income (Loss), Net of Tax, Attributable to Parent |  |  |  |  |  |  |  |  | $ (28,527,802)us-gaap_ComprehensiveIncomeNetOfTax | $ (6,555,083)us-gaap_ComprehensiveIncomeNetOfTax | $ (15,995,162)us-gaap_ComprehensiveIncomeNetOfTax |  |
Issuance Of Warrants Shares |  |  |  |  |  |  |  |  | 200,000 kopn_IssuanceOfWarrantsShares |  |  |  |
Fiscal Year Duration |  |  |  |  |  |  |  |  | 52 weeks | 52 | 52 |  |
Inventory, Net, Items Net of Reserve Alternative [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Raw materials | 2,057,202 us-gaap_InventoryRawMaterialsNetOfReserves |  |  |  | 1,441,569 us-gaap_InventoryRawMaterialsNetOfReserves |  |  |  | 2,057,202 us-gaap_InventoryRawMaterialsNetOfReserves | 1,441,569 us-gaap_InventoryRawMaterialsNetOfReserves |  |  |
Work-in-process | 1,551,799 us-gaap_InventoryWorkInProcessNetOfReserves |  |  |  | 1,003,540 us-gaap_InventoryWorkInProcessNetOfReserves |  |  |  | 1,551,799 us-gaap_InventoryWorkInProcessNetOfReserves | 1,003,540 us-gaap_InventoryWorkInProcessNetOfReserves |  |  |
Finished goods | 472,885 us-gaap_InventoryFinishedGoodsNetOfReserves |  |  |  | 632,946 us-gaap_InventoryFinishedGoodsNetOfReserves |  |  |  | 472,885 us-gaap_InventoryFinishedGoodsNetOfReserves | 632,946 us-gaap_InventoryFinishedGoodsNetOfReserves |  |  |
Inventory | 4,081,886 us-gaap_InventoryNet |  |  |  | 3,078,055 us-gaap_InventoryNet |  |  |  | 4,081,886 us-gaap_InventoryNet | 3,078,055 us-gaap_InventoryNet |  |  |
Warranty reserves | 700,000 us-gaap_ProductWarrantyAccrual |  |  |  | 0 us-gaap_ProductWarrantyAccrual |  |  |  | 700,000 us-gaap_ProductWarrantyAccrual | 0 us-gaap_ProductWarrantyAccrual |  |  |
Product warranty claims and reversals |  |  |  |  |  |  |  |  | 400,000 us-gaap_ProductWarrantyAccrualPeriodIncreaseDecrease | 800,000 us-gaap_ProductWarrantyAccrualPeriodIncreaseDecrease | 2,200,000 us-gaap_ProductWarrantyAccrualPeriodIncreaseDecrease |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Asset retirement obligation, beginning balance |  |  |  | 329,435 us-gaap_AssetRetirementObligation |  |  |  | 322,477 us-gaap_AssetRetirementObligation | 329,435 us-gaap_AssetRetirementObligation | 322,477 us-gaap_AssetRetirementObligation |  |  |
Accretion |  |  |  |  |  |  |  |  | 0 us-gaap_AssetRetirementObligationLiabilitiesIncurred | 0 us-gaap_AssetRetirementObligationLiabilitiesIncurred |  |  |
Charges |  |  |  |  |  |  |  |  | 0 us-gaap_AssetRetirementObligationLiabilitiesSettled | 0 us-gaap_AssetRetirementObligationLiabilitiesSettled |  |  |
Asset Retirement Obligation Increase/Decrease |  |  |  |  |  |  |  |  | (18,248)kopn_AssetRetirementObligationIncreaseDecrease |  |  |  |
Additional liabilities incurred |  |  |  |  |  |  |  |  |  | 6,958 us-gaap_AssetRetirementObligationAccretionExpense |  |  |
Asset retirement obligation, ending balance | 311,187 us-gaap_AssetRetirementObligation |  |  |  | 329,435 us-gaap_AssetRetirementObligation |  |  |  | 311,187 us-gaap_AssetRetirementObligation | 329,435 us-gaap_AssetRetirementObligation | 322,477 us-gaap_AssetRetirementObligation |  |
Weighted Average Number of Shares Outstanding Reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average common shares outstanding - basic (in shares) | 62,734,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 62,647,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 62,644,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 62,530,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 61,529,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 63,542,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 62,492,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 63,936,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 62,638,675 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 62,347,852 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 63,617,680 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  |
Stock options and non-vested restricted common stock |  |  |  |  |  |  |  |  | 0 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 0 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 0 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements |  |
Weighted average common shares outstanding - diluted (in shares) | 62,734,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 62,647,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 62,644,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 62,530,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 61,529,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 63,542,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 62,492,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 63,936,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 62,638,675 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 62,347,852 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 63,617,680 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  |
Antidilutive securities excluded from computation of earnings per share |  |  |  |  |  |  |  |  | 2,682,131 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 3,582,998 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 3,266,728 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount |  |
Compensation awards, number of shares of stock granted |  |  |  |  |  |  |  |  | 150,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod |  |  |  |
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures |  |  |  |  |  |  |  |  | 300,000 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax | 1,534,075 us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax |  |  |  | 2,524,701 us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax |  |  |  | 1,534,075 us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax | 2,524,701 us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax | 3,542,104 us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax | 1,319,870 us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent |  |  |  |  |  |  |  |  | (990,626)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent | (1,017,403)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent | 2,222,234 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent |  |
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax | 1,592,164 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax |  |  |  | 917,296 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax |  |  |  | 1,592,164 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax | 917,296 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax | 2,970,688 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax | 2,826,154 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax |
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent |  |  |  |  |  |  |  |  | 674,868 us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent | (2,053,392)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent | 144,534 us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | 3,126,239 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |  |  |  | 3,441,997 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |  |  |  | 3,126,239 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | 3,441,997 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | 6,512,792 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | 4,146,024 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent |  |  |  |  |  |  |  |  | (315,758)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent | (3,070,795)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent | 2,366,768 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent |  |
Carrying value of long-lived assets excluding assets held for sale | 4,600,000 kopn_AssetsExcludingAssetsOfDisposalGroupAndDiscontinuedOperationNoncurrent |  |  |  |  |  |  |  | 4,600,000 kopn_AssetsExcludingAssetsOfDisposalGroupAndDiscontinuedOperationNoncurrent |  |  |  |
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax |  |  |  |  |  |  |  |  | 681,346 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax | (116,134)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax | 730,967 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax |  |
Exercise Price Of Warrants | $ 3.49 kopn_ExercisePriceOfWarrants |  |  |  |  |  |  |  | $ 3.49 kopn_ExercisePriceOfWarrants |  |  |  |
Non-vested restricted common stock |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Number of Shares Outstanding Reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share |  |  |  |  |  |  |  |  | 2,551,631 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = kopn_UnvestedRestrictedStockAwardsMember | 3,024,148 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = kopn_UnvestedRestrictedStockAwardsMember | 2,283,048 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = kopn_UnvestedRestrictedStockAwardsMember |  |
Stock options |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Number of Shares Outstanding Reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share |  |  |  |  |  |  |  |  | 130,500 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember | 558,850 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember | 983,680 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  |  |  |  |  |  | 3 years |  |  |  |
Inventory, Net, Items Net of Reserve Alternative [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life of property, plant and equipment |  |  |  |  |  |  |  |  | 3 years |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  |  |  |  |  |  | 7 years |  |  |  |
Inventory, Net, Items Net of Reserve Alternative [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life of property, plant and equipment |  |  |  |  |  |  |  |  | 10 years |  |  |  |
Restricted stock |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Number of Shares Outstanding Reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation awards, number of shares of stock granted |  |  |  |  |  |  |  |  | 260,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 260,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Market Condition |  |  |  |  |  |  |  |  | 50,000 kopn_MarketCondition / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  |  |
Phantom stock |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Number of Shares Outstanding Reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation awards, number of shares of stock granted |  |  |  |  |  |  |  |  | 380,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember | 380,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_PhantomShareUnitsPSUsMember |  |  |
Restricted stock and phantom stock |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Number of Shares Outstanding Reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period following the grant date |  |  |  |  | 10 days |  |  |  |  |  |  |  |
Kowon |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  |  |  |  |  |  | 3,700,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = kopn_KowonTechnologyCorporationLimitedMember |  |  |
Percentage of voting interests acquired |  |  |  |  |  |  |  |  |  |  |  |  | 15.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = kopn_KowonTechnologyCorporationLimitedMember
Kowon |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Kopin's ownership percentage | 93.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = kopn_KowonTechnologyCorporationLimitedMember |  |  |  | 78.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = kopn_KowonTechnologyCorporationLimitedMember |  |  |  | 93.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = kopn_KowonTechnologyCorporationLimitedMember | 78.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = kopn_KowonTechnologyCorporationLimitedMember |  |  |
Intoware |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Kopin's ownership percentage | 58.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = kopn_IkanosMember |  |  |  |  |  |  |  | 58.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = kopn_IkanosMember |  |  |  |
eMDT |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Kopin's ownership percentage | 80.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = kopn_EMDTMember |  |  |  |  |  |  |  | 80.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = kopn_EMDTMember |  |  |  |
Accumulated Net Unrealized Investment Gain (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax |  |  |  |  |  |  |  |  | 700,000 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember |  |  |  |
Accumulated Translation Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax | (1,100,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |  |  |  |  |  |  |  | (1,100,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |  |  |  |
Scenario, Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Comprehensive Income (Loss), Net of Tax, Attributable to Parent |  |  |  |  |  |  |  |  |  | $ (0.6)us-gaap_ComprehensiveIncomeNetOfTax / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember | $ (0.1)us-gaap_ComprehensiveIncomeNetOfTax / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember |  |
Range One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Number of Shares Outstanding Reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Nonvested common stock awards employment obligations |  |  |  |  |  |  |  |  | 1 year |  |  |  |
Range One [Member] | Restricted stock and phantom stock |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Number of Shares Outstanding Reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Threshold closing price of common stock for vesting |  |  |  |  |  |  |  |  | $ 6.00 kopn_MarketPriceOfCommonStockRangeLow / us-gaap_AwardTypeAxis = kopn_RestrictedStockAndPhantomShareUnitsMember / us-gaap_VestingAxis = us-gaap_ShareBasedCompensationAwardTrancheOneMember |  |  |  |
Range Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Number of Shares Outstanding Reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Nonvested common stock awards employment obligations |  |  |  |  |  |  |  |  | 2 years |  |  |  |
Range Two [Member] | Restricted stock and phantom stock |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Number of Shares Outstanding Reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Threshold closing price of common stock for vesting |  |  |  |  |  |  |  |  | $ 7.00 kopn_MarketPriceOfCommonStockRangeLow / us-gaap_AwardTypeAxis = kopn_RestrictedStockAndPhantomShareUnitsMember / us-gaap_VestingAxis = us-gaap_ShareBasedCompensationAwardTrancheTwoMember |  |  |  |
Range Three [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Number of Shares Outstanding Reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Nonvested common stock awards employment obligations |  |  |  |  |  |  |  |  | 4 years |  |  |  |
Range Three [Member] | Restricted stock and phantom stock |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Number of Shares Outstanding Reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Threshold closing price of common stock for vesting |  |  |  |  |  |  |  |  | $ 5.25 kopn_MarketPriceOfCommonStockRangeLow / us-gaap_AwardTypeAxis = kopn_RestrictedStockAndPhantomShareUnitsMember / us-gaap_VestingAxis = us-gaap_ShareBasedCompensationAwardTrancheThreeMember |  |  |  |

X
- Definition Asset Retirement Obligation Increase/Decrease + References No definition available. + Details
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Namespace Prefix: | kopn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Assets Excluding Assets of Disposal Group and Discontinued Operation, Noncurrent + References No definition available. + Details
Name: | kopn_AssetsExcludingAssetsOfDisposalGroupAndDiscontinuedOperationNoncurrent
Namespace Prefix: | kopn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Exercise Price Of Warrants + References No definition available. + Details
Name: | kopn_ExercisePriceOfWarrants
Namespace Prefix: | kopn_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Definition Fiscal Year Duration + References No definition available. + Details
Name: | kopn_FiscalYearDuration
Namespace Prefix: | kopn_
Data Type: | us-types:durationStringItemType
Balance Type: | na
Period Type: | duration

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- Definition Issuance Of Warrants, Shares + References No definition available. + Details
Name: | kopn_IssuanceOfWarrantsShares
Namespace Prefix: | kopn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Market Condition + References No definition available. + Details
Name: | kopn_MarketCondition
Namespace Prefix: | kopn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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