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Debt - Summary of Principal Repayments of 2017 Credit Facility (Details) - 2017 Credit Facility - USD ($)
$ in Thousands
Sep. 30, 2019
Jul. 31, 2019
Dec. 31, 2018
Debt      
2020 $ 800    
2021 4,400    
2022 2,400    
2023 820    
Total principal amount $ 8,420 $ 8,000 $ 12,840