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Financial Instruments (Fair Value Measurements) (Details) (USD $)	12 Months Ended
	Dec. 28, 2013	Dec. 27, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	$ 0us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	$ 0us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	(765,483)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	(239,602)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Fair value measurements of financial assets	114,162,303us-gaap_FinancialInstrumentsOwnedAtFairValue	92,540,061us-gaap_FinancialInstrumentsOwnedAtFairValue
Goodwill, Acquired During Period	395,713us-gaap_GoodwillAcquiredDuringPeriod
Money Markets and Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurements of financial assets	16,756,666us-gaap_FinancialInstrumentsOwnedAtFairValue / us-gaap_DebtSecurityAxis = us-gaap_CashAndCashEquivalentsMember	14,635,802us-gaap_FinancialInstrumentsOwnedAtFairValue / us-gaap_DebtSecurityAxis = us-gaap_CashAndCashEquivalentsMember
U.S. Government Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurements of financial assets	68,284,392us-gaap_FinancialInstrumentsOwnedAtFairValue / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember	57,697,142us-gaap_FinancialInstrumentsOwnedAtFairValue / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Corporate Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurements of financial assets	12,984,331us-gaap_FinancialInstrumentsOwnedAtFairValue / us-gaap_DebtSecurityAxis = us-gaap_CorporateDebtSecuritiesMember	5,970,983us-gaap_FinancialInstrumentsOwnedAtFairValue / us-gaap_DebtSecurityAxis = us-gaap_CorporateDebtSecuritiesMember
Certificates of Deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurements of financial assets	14,703,812us-gaap_FinancialInstrumentsOwnedAtFairValue / us-gaap_DebtSecurityAxis = us-gaap_CertificatesOfDepositMember	12,555,010us-gaap_FinancialInstrumentsOwnedAtFairValue / us-gaap_DebtSecurityAxis = us-gaap_CertificatesOfDepositMember
Vuzix
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurements of financial assets	1,433,102us-gaap_FinancialInstrumentsOwnedAtFairValue / us-gaap_DebtSecurityAxis = kopn_VuzixMember	1,500,777us-gaap_FinancialInstrumentsOwnedAtFairValue / us-gaap_DebtSecurityAxis = kopn_VuzixMember
GCS Holdings
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurements of financial assets		180,347us-gaap_FinancialInstrumentsOwnedAtFairValue / us-gaap_DebtSecurityAxis = kopn_GCSHoldingsMember
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurements of financial assets	34,731,771us-gaap_FinancialInstrumentsOwnedAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	37,535,266us-gaap_FinancialInstrumentsOwnedAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Level 1 | Money Markets and Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurements of financial assets	16,756,666us-gaap_FinancialInstrumentsOwnedAtFairValue / us-gaap_DebtSecurityAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	14,635,802us-gaap_FinancialInstrumentsOwnedAtFairValue / us-gaap_DebtSecurityAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Level 1 | U.S. Government Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurements of financial assets	16,542,003us-gaap_FinancialInstrumentsOwnedAtFairValue / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	21,218,340us-gaap_FinancialInstrumentsOwnedAtFairValue / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Level 1 | Vuzix
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurements of financial assets	1,433,102us-gaap_FinancialInstrumentsOwnedAtFairValue / us-gaap_DebtSecurityAxis = kopn_VuzixMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	1,500,777us-gaap_FinancialInstrumentsOwnedAtFairValue / us-gaap_DebtSecurityAxis = kopn_VuzixMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Level 1 | GCS Holdings
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurements of financial assets		180,347us-gaap_FinancialInstrumentsOwnedAtFairValue / us-gaap_DebtSecurityAxis = kopn_GCSHoldingsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurements of financial assets	79,430,532us-gaap_FinancialInstrumentsOwnedAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	55,004,795us-gaap_FinancialInstrumentsOwnedAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Level 2 | U.S. Government Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurements of financial assets	51,742,389us-gaap_FinancialInstrumentsOwnedAtFairValue / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	36,478,802us-gaap_FinancialInstrumentsOwnedAtFairValue / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Level 2 | Corporate Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurements of financial assets	12,984,331us-gaap_FinancialInstrumentsOwnedAtFairValue / us-gaap_DebtSecurityAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	5,970,983us-gaap_FinancialInstrumentsOwnedAtFairValue / us-gaap_DebtSecurityAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Level 2 | Certificates of Deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurements of financial assets	14,703,812us-gaap_FinancialInstrumentsOwnedAtFairValue / us-gaap_DebtSecurityAxis = us-gaap_CertificatesOfDepositMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	12,555,010us-gaap_FinancialInstrumentsOwnedAtFairValue / us-gaap_DebtSecurityAxis = us-gaap_CertificatesOfDepositMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Level 2 | Vuzix
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurements of financial assets	0us-gaap_FinancialInstrumentsOwnedAtFairValue / us-gaap_DebtSecurityAxis = kopn_VuzixMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	0us-gaap_FinancialInstrumentsOwnedAtFairValue / us-gaap_DebtSecurityAxis = kopn_VuzixMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Level 2 | GCS Holdings
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurements of financial assets		0us-gaap_FinancialInstrumentsOwnedAtFairValue / us-gaap_DebtSecurityAxis = kopn_GCSHoldingsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurements of financial assets	0us-gaap_FinancialInstrumentsOwnedAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	0us-gaap_FinancialInstrumentsOwnedAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Level 3 | Money Markets and Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurements of financial assets	0us-gaap_FinancialInstrumentsOwnedAtFairValue / us-gaap_DebtSecurityAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	0us-gaap_FinancialInstrumentsOwnedAtFairValue / us-gaap_DebtSecurityAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Level 3 | U.S. Government Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurements of financial assets	0us-gaap_FinancialInstrumentsOwnedAtFairValue / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	0us-gaap_FinancialInstrumentsOwnedAtFairValue / us-gaap_DebtSecurityAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Level 3 | Corporate Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurements of financial assets	0us-gaap_FinancialInstrumentsOwnedAtFairValue / us-gaap_DebtSecurityAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	0us-gaap_FinancialInstrumentsOwnedAtFairValue / us-gaap_DebtSecurityAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Level 3 | Certificates of Deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurements of financial assets	0us-gaap_FinancialInstrumentsOwnedAtFairValue / us-gaap_DebtSecurityAxis = us-gaap_CertificatesOfDepositMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	0us-gaap_FinancialInstrumentsOwnedAtFairValue / us-gaap_DebtSecurityAxis = us-gaap_CertificatesOfDepositMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Level 3 | Vuzix
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurements of financial assets	0us-gaap_FinancialInstrumentsOwnedAtFairValue / us-gaap_DebtSecurityAxis = kopn_VuzixMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	0us-gaap_FinancialInstrumentsOwnedAtFairValue / us-gaap_DebtSecurityAxis = kopn_VuzixMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Level 3 | GCS Holdings
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurements of financial assets		0us-gaap_FinancialInstrumentsOwnedAtFairValue / us-gaap_DebtSecurityAxis = kopn_GCSHoldingsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Corporate Debt Securities And Certificates Of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	0us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = kopn_CorporateDebtSecuritiesAndCertificatesOfDepositMember	0us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = kopn_CorporateDebtSecuritiesAndCertificatesOfDepositMember
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	$ (79,370)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = kopn_CorporateDebtSecuritiesAndCertificatesOfDepositMember	$ (38,830)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = kopn_CorporateDebtSecuritiesAndCertificatesOfDepositMember

X

- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

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- Definition

Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

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- Definition

The aggregate fair value as of the balance sheet date of financial instruments and other positions owned by the entity including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities. Includes both pledged and unpledged holdings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 940

-SubTopic 320

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969

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- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)

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