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Debt - Schedule of Short-term Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Sep. 17, 2020
Mar. 18, 2020
Debt Instrument [Line Items]        
Unamortized Debt discount $ 0 $ (254)    
Total Short-Term Debt 3,251 5,401    
March 2020 Note Purchase Agreement and Promissory Note        
Debt Instrument [Line Items]        
Notes payable, current $ 3,251 $ 5,655    
Debt instrument, interest rate, stated percentage     5.00% 10.00%