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OMM Debt (Details) - USD ($)
3 Months Ended 12 Months Ended
Apr. 02, 2021
Dec. 31, 2020
Dec. 31, 2019
Debt Disclosure [Abstract]      
Secured Debt, Current   $ 1,121,000 $ 0
Short-term Debt, Percentage Bearing Fixed Interest Rate   1.68%  
Debt Instrument, Maturity Date   Dec. 30, 2020  
Extinguishment of Debt, Amount   $ 594,000  
Subsequent Event [Line Items]      
Debt Instrument, Maturity Date   Dec. 30, 2020  
Subsequent Event [Member]      
Debt Disclosure [Abstract]      
Debt Instrument, Maturity Date Jun. 24, 2021    
Subsequent Event [Line Items]      
Debt Instrument, Fee If the OMM Note is not paid in full, including the extension fee, on the Extension Date an additional fee of $472,000 is due and payable on demand.    
Debt Instrument, Maturity Date Jun. 24, 2021    
Debt Instrument, Fee Amount $ 118,000