Annual report pursuant to Section 13 and 15(d)

Income Taxes - Components of Income (Loss) From Continuing Operations (Details)

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Income Taxes - Components of Income (Loss) From Continuing Operations (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 29, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 30, 2017
Sep. 30, 2017
Jul. 01, 2017
Apr. 01, 2017
Sep. 29, 2018
Sep. 29, 2018
Dec. 29, 2018
Dec. 30, 2017
Income Tax Disclosure [Abstract]                      
Domestic operations                   $ (5,696) $ 2,553
Foreign operations                   479 481
Income from continuing operations before income taxes $ (172) $ (904) $ 937 $ 185 $ 947 $ 1,059 $ 843 $ 33 $ (139) $ (5,217) $ 3,034