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Leases - Lease costs (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Leases    
Operating lease cost $ 614 $ 648
Variable lease cost 10 22
Total lease costs 624 670
Cash paid for amounts included in the measurement of lease liabilities $ 499 $ 557
Remaining lease term 7 years 3 months 18 days  
Discount rate 5.50%