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Debt - Schedule of Aggregate Principal Amount of Debt Outstanding (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Debt Disclosure [Abstract]    
Current portion of debt $ 3,750 $ 7,500
Less: unamortized debt discount (6) (33)
Current portion of debt, net of debt discount 3,744 7,467
Long-term debt, net of current portion 0 1,875
Less: unamortized debt discount 0 (8)
Long-term debt, net of current portion $ 0 $ 1,867