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Leases - Supplemental information related to leases (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Leases [Abstract]        
Operating lease cost: $ 702 $ 646 $ 2,024 $ 1,931
Operating cash flows from operating leases     2,139 1,993
Leased assets obtained in exchange for new operating lease liabilities     $ 3,267 $ 1,226
Weighted average remaining lease term (in years) 3 years 11 months 4 days 3 years 6 months 3 days 3 years 11 months 4 days 3 years 6 months 3 days
Weighted average discount rate 5.06% 5.75% 5.06% 5.75%