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Leases - Lease costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Leases      
Operating lease cost $ 4,342 $ 2,503 $ 2,596
Variable lease cost 58 150 80
Total lease costs 4,400 2,653 2,676
Cash paid for amounts included in the measurement of lease liabilities $ 2,773 $ 2,233 $ 1,929
Remaining lease term 12 years 3 months 18 days 7 years 4 months 24 days 5 years 6 months
Discount rate 5.80% 5.50% 5.50%