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FAIR VALUE MEASUREMENTS (Details Narrative) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 25, 2021	Sep. 25, 2021
Fair Value Disclosures [Abstract]
Unrealized gain (loss) on securities	$ 0.1	$ 0.1

X

- Definition

Amount of unrealized gain (loss) recognized in the income statement on unsold other securities.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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