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Loans and Convertible Notes Payable - Summary of Loans and Convertible Notes Payable (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Gross $ 5,000 $ 2,000
Discount (398)  
Net 4,602 2,000
Loan Avenue    
Debt Instrument [Line Items]    
Gross [1] 12,638  
Discount [1] (1,804)  
Net [1] 10,834  
Convertible Note Payable Rosalind    
Debt Instrument [Line Items]    
Gross 2,000 2,000
Net 2,000 $ 2,000
Convertible Loan Payable Avenue    
Debt Instrument [Line Items]    
Gross 3,000  
Discount (398)  
Net $ 2,602  
[1] The gross amount includes the 4.25% final payment of $637.5.