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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