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Deferred Revenue and Other Contract-Related Liabilities - Deferred Revenue and Other Contract Liabilities (Details) - USD ($) | Mar. 31, 2018 | Dec. 30, 2017
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Revenue Recognition and Deferred Revenue [Abstract] |  |
Accrued customer reimbursements | $ 17,648,000 | $ 16,896,000
Deferred revenue | 12,385,000 | 11,589,000
Accrued rebates and incentives | 4,407,000 | 3,598,000
Other contract-related liabilities | 281,000 | 259,000
Total deferred revenue and other contract-related liabilities | 34,721,000 | 32,342,000
Less: Non-current portion of deferred revenue | (212,000) | (237,000)
Deferred revenue and other contract-related liabilities, current | $ 34,509,000 | $ 32,105,000

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