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Accrued Warranty (Details Narrative)	12 Months Ended
	Dec. 26, 2020
Warranty [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Product warranty term	The Company warrants its products against defect for 12 months, however, for certain products a customer may purchase an extended warranty.

X

- Definition

Product warranty term.

+ References

No definition available.

+ Details

Name:	KOPN_ProductWarrantyTerm
Namespace Prefix:	KOPN_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

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

X

- Details

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