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Leases - Balance Sheet Classification of Lease Liabilities (Details) - USD ($)
$ in Thousands
Sep. 27, 2019
Dec. 28, 2018
Operating lease liabilities:    
Current portion included in Other current liabilities $ 2,695 $ 2,738
Long-term portion of lease liabilities 23,661 12,099
Total operating lease liabilities 26,356 14,837
Financing lease liabilities:    
Current portion included in Other current liabilities 50 49
Long-term portion of lease liabilities 44 79
Financing obligation for build-to-suit lease 94 128
Total lease liabilities $ 26,450 $ 14,965