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Leases - Lease Cost and Other Lease Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Lease Costs        
Operating lease costs $ 622 $ 619 $ 1,877 $ 1,736
Variable lease costs 99 133 401 363
Short-term lease costs 15 46 45 69
Net lease cost 736 798 2,323 2,168
Cash paid for amounts included in the measurement of lease liabilities        
Operating lease cash flows - Fixed payments 616 605 1,839 1,688
Operating lease cash flows - Liability reduction $ 546 526 1,610 1,479
Right of use assets obtained during the period in exchange for operating lease liabilities   $ 159 $ 128 $ 923
Weighted average lease term (in years) 6 years 5 months 4 days 6 years 8 months 23 days 6 years 5 months 4 days 6 years 8 months 23 days
Weighted average discount rate (in percent) 3.08% 3.04% 3.08% 3.04%