Gross proceeds from registered sale equity securities.

No definition available.

Name:	KOPN_GrossProceedsFromRegisteredSaleEquitySecurities
Namespace Prefix:	KOPN_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Underwriting discounts and offering expenses from sale of equity.

+ References

No definition available.

+ Details

Name:	KOPN_UnderwritingDiscountsAndOfferingExpensesfromSaleofEquity
Namespace Prefix:	KOPN_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3255-108585

+ Details

Name:	us-gaap_ProceedsFromIssuanceOrSaleOfEquity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of consideration received by subsidiary or equity investee in exchange for shares of stock issued or sold. Includes amount of cash received, fair value of noncash assets received, and fair value of liabilities assumed by the investor.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockConsiderationReceivedPerTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Per share or per unit amount of equity securities issued.

+ References

No definition available.

+ Details

Name:	us-gaap_SharesIssuedPricePerShare
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_SubsidiarySaleOfStockLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=KOPN_AtTheMarketOfferingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TypeOfArrangementAxis=KOPN_MarchFifthTwentyTwentyOneAtTheMarketAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_CommonStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=KOPN_StifelMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TypeOfArrangementAxis=KOPN_FebruaryEightTwoThousandAndNineteenAtTheMarketAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementEquityComponentsAxis=KOPN_CommonStockOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

STOCKHOLDERS’ EQUITY AND STOCK-BASED COMPENSATION (Details Narrative) - USD ($)	3 Months Ended		9 Months Ended		15 Months Ended
	Sep. 24, 2022	Sep. 25, 2021	Sep. 24, 2022	Sep. 25, 2021	Sep. 25, 2021
Subsidiary, Sale of Stock [Line Items]
Unrecognized compensation expense	$ 3,000,000.0		$ 3,000,000.0
Weighted average period, unrecognized			3 years
At The Market Offering [Member]
Subsidiary, Sale of Stock [Line Items]
Underwriting discounts and offering expenses	100,000	$ 100,000		$ 700,000
At The Market Offering [Member] \| March 5, 2021 At The Market Agreement [Member]
Subsidiary, Sale of Stock [Line Items]
Proceeds from sale of stock	$ 41,400,000
At The Market Offering [Member] \| Common Stock [Member]
Subsidiary, Sale of Stock [Line Items]
Sale of stock, number of shares issued	675,000		2,300,000	3,100,000	600,000
Gross proceeds from registered sale equity securities	$ 858,000	$ 4,800,000
Share price	$ 1.27	$ 8.00	$ 1.27	$ 8.00	$ 8.00
At The Market Offering [Member] \| Common Stock [Member] \| Maximum [Member] \| Stifel [Member] \| March 5, 2021 At The Market Agreement [Member]
Subsidiary, Sale of Stock [Line Items]
Sale of stock	$ 50,000,000
At The Market Offering [Member] \| Common Stock [Member] \| Maximum [Member] \| Stifel [Member] \| February 8, 2019 At The Market Agreement [Member]
Subsidiary, Sale of Stock [Line Items]
Sale of stock				$ 50,000,000
At The Market Offering [Member] \| Common Stock [Member]
Subsidiary, Sale of Stock [Line Items]
Gross proceeds from registered sale equity securities			$ 2,948,000	$ 21,700,000
Share price	$ 1.26	$ 7.00	$ 1.26	$ 7.00	$ 7.00