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Segments and Geographical Information (Percentage of Net Revenues by Geographies) (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 27, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 10,637,000us-gaap_Revenues	$ 9,532,000us-gaap_Revenues	$ 6,943,000us-gaap_Revenues	$ 4,695,000us-gaap_Revenues	$ 5,550,000us-gaap_Revenues	$ 4,950,000us-gaap_Revenues	$ 6,079,000us-gaap_Revenues	$ 6,319,000us-gaap_Revenues	$ 31,807,465us-gaap_Revenues	$ 22,897,709us-gaap_Revenues	$ 34,641,860us-gaap_Revenues
Percent of Total									100.00%kopn_PercentageOfTotalRevenue	100.00%kopn_PercentageOfTotalRevenue	100.00%kopn_PercentageOfTotalRevenue
Long lived assets	4,589,000us-gaap_NoncurrentAssets				6,035,000us-gaap_NoncurrentAssets				4,589,000us-gaap_NoncurrentAssets	6,035,000us-gaap_NoncurrentAssets
United States of America
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									19,695,000us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US	11,927,000us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US	25,356,000us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US
Percent of Total									62.00%kopn_PercentageOfTotalRevenue / us-gaap_StatementGeographicalAxis = country_US	53.00%kopn_PercentageOfTotalRevenue / us-gaap_StatementGeographicalAxis = country_US	73.00%kopn_PercentageOfTotalRevenue / us-gaap_StatementGeographicalAxis = country_US
Long lived assets	2,689,000us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US				3,050,000us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US				2,689,000us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US	3,050,000us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US
Others
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									416,000us-gaap_Revenues / us-gaap_StatementGeographicalAxis = kopn_OthersMember	230,000us-gaap_Revenues / us-gaap_StatementGeographicalAxis = kopn_OthersMember	93,000us-gaap_Revenues / us-gaap_StatementGeographicalAxis = kopn_OthersMember
Percent of Total									1.00%kopn_PercentageOfTotalRevenue / us-gaap_StatementGeographicalAxis = kopn_OthersMember	1.00%kopn_PercentageOfTotalRevenue / us-gaap_StatementGeographicalAxis = kopn_OthersMember	0.00%kopn_PercentageOfTotalRevenue / us-gaap_StatementGeographicalAxis = kopn_OthersMember
Americas
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									20,111,000us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_AmericasMember	12,157,000us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_AmericasMember	25,449,000us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_AmericasMember
Percent of Total									63.00%kopn_PercentageOfTotalRevenue / us-gaap_StatementGeographicalAxis = us-gaap_AmericasMember	54.00%kopn_PercentageOfTotalRevenue / us-gaap_StatementGeographicalAxis = us-gaap_AmericasMember	73.00%kopn_PercentageOfTotalRevenue / us-gaap_StatementGeographicalAxis = us-gaap_AmericasMember
Asia-Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									8,245,000us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember	8,292,000us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember	7,132,000us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember
Percent of Total									26.00%kopn_PercentageOfTotalRevenue / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember	36.00%kopn_PercentageOfTotalRevenue / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember	21.00%kopn_PercentageOfTotalRevenue / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									3,451,000us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember	2,449,000us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember	2,061,000us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember
Percent of Total									11.00%kopn_PercentageOfTotalRevenue / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember	10.00%kopn_PercentageOfTotalRevenue / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember	6.00%kopn_PercentageOfTotalRevenue / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Long lived assets	377,000us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_GB				795,000us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_GB				377,000us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_GB	795,000us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_GB
Republic of Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Long lived assets	$ 1,523,000us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_KR				$ 2,190,000us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_KR				$ 1,523,000us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_KR	$ 2,190,000us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_KR

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- Definition

Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 280

-SubTopic 10

-Section 50

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

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