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Long-term Debt - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Aug. 14, 2021
USD ($)
payment
Jul. 15, 2021
USD ($)
Nov. 14, 2020
USD ($)
payment
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
loan
financing_company
Sep. 03, 2020
Apr. 14, 2020
USD ($)
Debt Instrument [Line Items]                    
Current portion of long-term debt       $ 352   $ 352   $ 553    
Long-term debt       72   72   $ 4,659    
Gain on extinguishment of debt       9,840 $ 0 9,840 $ 0      
Other notes payable | Other Loans - various interest                    
Debt Instrument [Line Items]                    
Number of loan agreements | loan               3    
Number of capital asset financing companies | financing_company               2    
Proceeds from debt               $ 800    
Current portion of long-term debt       400   400        
Long-term debt       $ 100   $ 100        
Other notes payable | Other Loans - various interest | Minimum                    
Debt Instrument [Line Items]                    
Interest rate         9.80%   9.80%      
Other notes payable | Other Loans - various interest | Maximum                    
Debt Instrument [Line Items]                    
Interest rate         12.40%   12.40%      
PPP Loan | Unsecured obligations                    
Debt Instrument [Line Items]                    
Interest rate       1.00%   1.00%     1.00%  
Aggregate principal amount                   $ 4,800
Number of monthly payments | payment 45   18              
Monthly payment $ 100   $ 300              
Full forgiveness   $ 4,800                
Gain on extinguishment of debt       $ 4,800   $ 4,800