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INCOME TAXES - (Details) - USD ($)
$ in Thousands
9 Months Ended
Mar. 27, 2020
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
INCOME TAXES        
Federal statutory income tax rate (as a percent)   21.00%    
Effective income tax rate (as a percent)   147.39%    
Liability for uncertain tax positions   $ 0   $ 0
Payroll Protection Program Loan        
INCOME TAXES        
Proceeds from debt $ 5,051      
Debt forgiveness $ 4,851      
Deferred tax asset for nondeductible expense     $ 1,276 $ 1,276