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Revolving Credit Facility and Long-Term Debt - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2018
Dec. 31, 2020
May 31, 2019
Debt Instrument [Line Items]              
Interest expense, debt $ 100,000 $ 100,000 $ 200,000 $ 300,000      
Amortization of debt financing costs 47,000 $ 47,000 95,000 $ 94,000      
Revolving Credit Facility, Maturing March 2024              
Debt Instrument [Line Items]              
Expiration date         Mar. 05, 2024    
Maximum borrowing capacity         $ 80,000,000    
Line of credit facility, capacity available for trade purchases         6,800,000    
Line of credit facility, capacity available for specific purpose other than for trade purchases         40,000,000    
Outstanding borrowings $ 0   $ 0        
Debt instrument, covenant, current fixed charge ratio required, minimum 1.00%   1.00%        
Remaining borrowing capacity $ 49,700,000   $ 49,700,000        
Revolving Credit Facility, Maturing March 2024 | Base Rate              
Debt Instrument [Line Items]              
Basis spread on variable rate     3.75%        
Revolving Credit Facility, Maturing March 2024 | London Interbank Offered Rate (LIBOR)              
Debt Instrument [Line Items]              
Basis spread on variable rate     3.00%        
Revolving Credit Facility, Maturing March 2024 | Minimum              
Debt Instrument [Line Items]              
Unused commitment fee, percent     0.25%        
Revolving Credit Facility, Maturing March 2024 | Minimum | Base Rate              
Debt Instrument [Line Items]              
Basis spread on variable rate     0.50%        
Revolving Credit Facility, Maturing March 2024 | Minimum | London Interbank Offered Rate (LIBOR)              
Debt Instrument [Line Items]              
Basis spread on variable rate     1.25%        
Revolving Credit Facility, Maturing March 2024 | Minimum | Adjustable Rate Loans              
Debt Instrument [Line Items]              
Basis spread on variable rate     2.00%        
Revolving Credit Facility, Maturing March 2024 | Maximum              
Debt Instrument [Line Items]              
Unused commitment fee, percent     0.50%        
Revolving Credit Facility, Maturing March 2024 | Maximum | Base Rate              
Debt Instrument [Line Items]              
Basis spread on variable rate     1.25%        
Revolving Credit Facility, Maturing March 2024 | Maximum | London Interbank Offered Rate (LIBOR)              
Debt Instrument [Line Items]              
Basis spread on variable rate     2.00%        
Revolving Credit Facility, Maturing March 2024 | Maximum | Adjustable Rate Loans              
Debt Instrument [Line Items]              
Basis spread on variable rate     2.75%        
Revolving Credit Facility, Maturing March 2024 | UK Borrower              
Debt Instrument [Line Items]              
Maximum borrowing capacity         $ 12,000,000    
Revolving Credit Facility, Maturing March 2024 | TB Germany GmbH | Maximum | ROCCAT              
Debt Instrument [Line Items]              
Line of credit to make investments             $ 4,000,000
Line of credit to make additional investments             $ 4,000,000
Revolving credit facilities              
Debt Instrument [Line Items]              
Long Term Debt $ 0   $ 0     $ 0