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Borrowings - Maturities of long-term debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Long-term debt.    
2020 $ 5,992  
2021 12,058  
2022 42,333  
2023 555  
Total long-term debt $ 60,938 $ 32,733