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Debt - Share Lending Agreement (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Jul. 29, 2019
Debt Instrument [Line Items]      
Common stock outstanding (in shares) 12,863,998 11,661,797  
Affiliated Entity | Jefferies Capital Services LLC      
Debt Instrument [Line Items]      
Commons stock available to affiliate (in shares)     511,840
Common stock outstanding (in shares) 500,000    
Outstanding loaned shares $ 25,800    
Nominal fee per borrowed share $ 30    
Shares subject to become issued and outstanding in case of restructuring proceedings (in shares) 500,000