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Debt - Summary of Principal Repayments of 2019 Credit Facility (Details) - 2019 Credit Facility - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Debt    
2020 $ 800  
2021 4,400  
2022 2,400  
2023 820  
Total principal amount $ 8,420 $ 12,840