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Oxford Term Loans - Maturities of Debt (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Debt Disclosure [Abstract]  
2022 $ 26,087
2023 39,130
2024 9,783
Total principal payments 75,000
Unamortized debt discounts and issuance costs (1,492)
Long term debt, net of discounts and issuance costs $ 73,508