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Right of use of assets - Summary of costs included in operating expenses related to right of use assets (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Lease cost    
Operating lease cost $ 1,718 $ 1,023
Variable lease cost 0 (45)
Short-term lease cost 111 86
Total lease cost 1,829 1,064
Cash paid for amounts included in the measurement of lease liabilities:    
Cash paid for amounts included in the measurement of lease liabilities: 1,679 1,018
Operating cash flows used in operating leases $ 796 $ 5,599
Weighted average remaining lease term (in years) 1 year 6 months 1 year 10 months 24 days
Weighted average discount rate (in percent) 4.96% 4.99%