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Related parties and related-party transactions (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Related parties and related-party transactions      
Rent paid $ 60   $ 0
Konica Minolta, Inc      
Related parties and related-party transactions      
Service fees 99 $ 91  
Payables $ 114   $ 117