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Leases - Lease costs and other lease information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Lease costs      
Operating lease cost $ 1,827 $ 2,457 $ 2,378
Variable lease cost 823 1,170 819
Short-term lease cost 181 395 535
Finance lease cost      
Interest on lease liabilities 25 42 58
Amortization of right-of-use assets 116 116 116
Sublease Income (228) (228) (270)
Net lease cost 2,744 3,952 3,636
Cash paid for amounts included in the measurement of lease liabilities operating cash flows from operating leases 1,763 2,432 $ 2,376
Right-of-use assets obtained in exchange for new operating lease liabilities $ 267 $ 1,555