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Debt (Details) - USD ($)
3 Months Ended
Sep. 17, 2020
Jun. 25, 2020
Dec. 31, 2019
Sep. 30, 2021
Dec. 31, 2020
Jun. 24, 2020
Dec. 30, 2019
Debt Instrument [Line Items]              
Credit limit on revolving loan facility     $ 25,000,000 $ 25,000,000     $ 23,000,000
Commitment fee percentage on line of credit       0.25%      
Loan and Security Agreement              
Debt Instrument [Line Items]              
Face value of term loan           $ 5,000,000  
Amended and Restated Loan And Security Agreement, Foreign Bank Term Loan              
Debt Instrument [Line Items]              
Face value of term loan   $ 15,000,000          
Amended and Restated Loan And Security Agreement, Term Loan | London Interbank Offered Rate (LIBOR)              
Debt Instrument [Line Items]              
Variable interest rate 2.25%            
Amended and Restated Loan And Security Agreement, Term Loan | London Interbank Offered Rate (LIBOR) | Maximum              
Debt Instrument [Line Items]              
Variable interest rate   3.50%          
Amended and Restated Loan And Security Agreement, Term Loan | London Interbank Offered Rate (LIBOR) | Minimum              
Debt Instrument [Line Items]              
Variable interest rate   2.25%          
All Debt              
Debt Instrument [Line Items]              
Increase in debt       $ 5,600,000      
Line of Credit | Loan and Security Agreement              
Debt Instrument [Line Items]              
Percent of qualified AR         80.00%    
Percent of the lower of Cost or Market of US Inventory values         50.00%    
Line of Credit | Amended and Restated Loan And Security Agreement, Term Loan              
Debt Instrument [Line Items]              
Percent of qualified AR   80.00%          
Percent of Net Orderly Liquidation Value (NOLV)   85.00%          
Percent of US real estate values   62.50%          
Credit limit on revolving loan facility     25,000,000        
Term Loan              
Debt Instrument [Line Items]              
Face value of term loan     10,000,000        
Credit limit for external borrowing     $ 5,000,000       $ 2,500,000
Term of loan     5 years        
Fixed interest rate     4.00%