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Long-Term Debt - Schedule Principal Payments on Outstanding Borrowings (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Debt Disclosure [Abstract]    
2022 $ 67,595  
Total 67,595  
Less: debt discounts and issuance costs (1,079)  
Non-current portion $ 66,516 $ 61,229