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Contract Assets and Liabilities (Details Narrative) - USD ($) $ in Millions	12 Months Ended
	Dec. 26, 2020	Dec. 28, 2019
Contract Assets And Liabilities
Increase in contract assets	$ 1.9
Contract with customer, liability, revenue recognized	$ 0.6	$ 0.8

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- References

No definition available.

+ Details

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

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- Definition

Increase in contract assets and liabilities.

+ References

No definition available.

+ Details

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Namespace Prefix:	KOPN_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045

+ Details

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