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Debt - Credit Facilities (Details)
Aug. 11, 2020
USD ($)
creditFacility
Dec. 11, 2018
USD ($)
Sep. 30, 2021
USD ($)
Apr. 20, 2021
USD ($)
Dec. 31, 2020
USD ($)
Aug. 31, 2020
creditFacility
Line of Credit Facility [Line Items]            
Number of debt financing facilities | creditFacility 2         2
Credit line borrowings, net of loan origination fees     $ 2,666,000   $ 2,298,000  
Revolving Credit Facility | Inventory Facility            
Line of Credit Facility [Line Items]            
Maximum borrowing capacity on line of credit $ 3,000,000     $ 3,500,000    
Inventory costs 75.00%          
Inventory, net orderly liquidation value 85.00%          
Interest rate 5.75%   22.40%   23.60%  
Monthly service fee 1.00%          
Minimum monthly fee $ 18,000          
Credit line borrowings, net of loan origination fees     $ 1,400,000   $ 1,300,000  
Amortized net issuance costs     $ 100,000   $ 100,000  
Revolving Credit Facility | Inventory Facility | London Interbank Offered Rate (LIBOR)            
Line of Credit Facility [Line Items]            
Interest rate 4.00%          
Revolving Credit Facility | Receivables Facility            
Line of Credit Facility [Line Items]            
Maximum borrowing capacity on line of credit $ 2,500,000          
Interest rate     8.00%   7.90%  
Monthly service fee 1.00%          
Minimum monthly fee $ 25,000          
Percent of accounts receivable used as borrowing capacity 90.00%          
Stated interest rate on collateral management fee     6.00%   6.00%  
Credit line borrowings, net of loan origination fees     $ 1,300,000   $ 1,000,000  
Amortized net issuance costs     $ 14,000   $ 40,000  
Revolving Credit Facility | Receivables Facility | Prime Rate            
Line of Credit Facility [Line Items]            
Interest rate 2.00%          
Revolving Credit Facility | Austin Facility            
Line of Credit Facility [Line Items]            
Maximum borrowing capacity on line of credit   $ 5,000,000        
Line of credit term (in years)   3 years        
Annual facility fee   1.00%        
Annual facility fee, payment period   3 years        
Collateral management fee   0.50%        
Payment to close Austin credit facility $ 1,400,000          
Termination fee 100,000          
Write off of remaining issuance costs $ 59,000          
Revolving Credit Facility | Austin Facility | Prime Rate            
Line of Credit Facility [Line Items]            
Margin added to borrowing rate   2.00%