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Leases - Supplemental cash flow information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows from operating leases $ 718 $ 708
Right-of-use assets obtained in exchange for lease obligations:    
Operating leases $ 97 $ 51