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Lease Liabilities - Lease Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Operating leases        
Operating lease cost $ 219 $ 278 $ 657 $ 791
Variable lease cost 8 4 26 12
Operating lease expense 227 282 683 803
Short-term lease rent expense 0 9 0 38
Net rent expense $ 227 $ 291 $ 683 $ 841