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Notes Payable - Borrowings Outstanding (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Notes Payable    
Borrowings outstanding $ 25,000 $ 25,000
Accrued exit fee 54 355
Unamortized discount 118 129
Borrowings 24,936 25,226
Less: current portion   (8,290)
Long-term notes payable $ 24,936 $ 16,936