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Leases - Lease costs and other lease information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Lease costs    
Operating lease cost $ 2,457 $ 2,378
Variable lease cost 1,170 819
Short-term lease cost 395 535
Finance lease cost    
Interest on lease liabilities 42 58
Amortization of right-of-use assets 116 116
Sublease Income (228) (270)
Net lease cost 3,952 3,636
Operating cash flows from operating leases 2,432 $ 2,376
Right-of-use assets obtained in exchange for new operating lease liabilities $ 1,555