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Valuation and Qualifying Accounts (Tables) | 12 Months Ended
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Dec. 26, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
Schedule of Valuation and Qualifying Accounts | The following table sets forth activity in Kopin’s allowance for doubtful accounts: Schedule of Valuation and Qualifying Accounts
Fiscal year ended: |  | Balance at Beginning of Year |  |  | Additions Charged to Income |  |  | Deductions from Reserve |  |  | Balance at End of Year |
December 29, 2018 |  | $ | 149,000 |  |  | $ | 268,000 |  |  | $ | (113,000 | ) |  | $ | 304,000 |
December 28 2019 |  |  | 304,000 |  |  |  | 951,000 |  |  |  | (317,000 | ) |  |  | 938,000 |
December 26, 2020 |  | $ | 938,000 |  |  | $ | 42,000 |  |  | $ | (805,000 | ) |  | $ | 175,000 |

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