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Accrued Warranty - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2012
Class of Warrant or Right [Line Items]
Product warranty, standard term (in months)	12 months

X

- Definition

Product Warranty Term

+ References

No definition available.

+ Details

Name:	kopn_ProductWarrantyTerm
Namespace Prefix:	kopn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

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