Quarterly report pursuant to Section 13 or 15(d)

INCOME TAXES (Details)

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INCOME TAXES (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2021
Jun. 25, 2020
Jun. 30, 2021
Jun. 25, 2020
Dec. 31, 2020
Income Tax Disclosure [Abstract]            
(Benefit) provision for income taxes $ 10 $ (4,167) $ (364) $ (7,849) $ (3,482)  
Discrete income tax expense (benefit)   $ (4,200)   $ (4,300)    
Effective tax rate (as a percent) (2.00%) 882.80% 6.20% 48.50% 9.30%  
Pretax income (loss) $ (495) $ (472) $ (5,845) $ (16,179) $ (37,618)  
Uncertain tax position liability   $ 200   $ 200   $ 1,200