Annual report pursuant to Section 13 and 15(d)

Income Taxes - Income (Loss) before income taxes (Details)

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Income Taxes - Income (Loss) before income taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 29, 2019
Dec. 30, 2018
Dec. 31, 2017
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract]      
U.S. $ (14,549) $ (16,045) $ 32,208
Foreign (7,688) (5,365) (3,188)
(Loss) income before income taxes $ (22,237) $ (21,410) $ 29,020