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Notes Payable - Schedule of Aggregate Carrying Amounts of Term Loans (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Less: unamortized discount $ (177)  
Total 10,067  
Line of Credit    
Debt Instrument [Line Items]    
Principal 10,000 $ 10,000
Add: accreted liability for Final Payment fee 244 176
Less: unamortized discount (177) (235)
Total $ 10,067 $ 9,941