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Long-term Debt - Narrative (Details)
$ in Thousands
6 Months Ended
Aug. 14, 2021
USD ($)
payment
Jul. 15, 2021
USD ($)
Nov. 14, 2020
USD ($)
payment
Jun. 30, 2021
USD ($)
milestone
loan
Dec. 31, 2020
USD ($)
Sep. 03, 2020
Apr. 14, 2020
USD ($)
Debt Instrument [Line Items]              
Current portion of long-term debt       $ 1,452 $ 553    
Long-term debt       3,805 $ 4,659    
Unsecured obligations              
Debt Instrument [Line Items]              
Aggregate principal amount       $ 5,300      
Other notes payable | Other Loans - various interest              
Debt Instrument [Line Items]              
Number of loan agreements | loan       3      
Number of capital asset financing companies | milestone       2      
Proceeds from debt       $ 800      
Current portion of long-term debt       300      
Long-term debt       $ 100      
Other notes payable | Other Loans - various interest | Minimum              
Debt Instrument [Line Items]              
Interest rate       9.80%      
Other notes payable | Other Loans - various interest | Maximum              
Debt Instrument [Line Items]              
Interest rate       12.40%      
PPP Loan | Unsecured obligations              
Debt Instrument [Line Items]              
Interest rate       1.00%   1.00%  
Aggregate principal amount             $ 4,800
Number of monthly payments | payment     18        
Monthly payment     $ 300        
PPP Loan | Unsecured obligations | Subsequent event              
Debt Instrument [Line Items]              
Full forgiveness   $ 4,800          
PPP Loan | Unsecured obligations | Forecast              
Debt Instrument [Line Items]              
Number of monthly payments | payment 45            
Monthly payment $ 100