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Valuation and Qualifying Accounts (Notes)
 12 Months Ended
Dec. 30, 2017
Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts
Valuation and Qualifying Accounts
The following table sets forth activity in Kopin's allowance for doubtful accounts:
Fiscal year ended:
Balance at
Beginning
of Year
 
Additions
Charged
to
Income
 
Deductions
from
Reserve
 
Balance at
End of
Year
December 26, 2015
$
266,000

 
$
—

 
$
(113,000
)
 
$
153,000

December 31, 2016
153,000

 
—

 
(17,000
)
 
136,000

December 30, 2017
$
136,000

 
$
13,000

 
$
—

 
$
149,000