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Lease - Components of lease expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Leases    
Operating lease cost $ 1,225 $ 1,225
Variable lease cost 959 772
Total lease costs 2,184 1,997
Finance lease cost    
Amortization of right of use asset $ 85 $ 85
Finance Lease, Right-of-Use Asset, Statement of Financial Position Other non-current assets Other non-current assets
Interest on lease liability $ 12 $ 16