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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
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