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Capital lease obligation - Schedule of Future Minimum Lease Payments Required Under The Lease (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
2020 (remainder) $ 551  
2021 734  
2022 734  
2023 734  
2024 514  
Thereafter 226  
Total 3,493  
Less payment amount allocated to interest 356  
Present value of capital lease obligation 3,137  
Current portion of capital lease obligation 605 $ 598
Long-term portion of capital lease obligation 2,532 $ 2,687
Total capital lease obligation $ 3,137