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Basis of presentation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2024
Dec. 31, 2021
Dec. 31, 2022
Mar. 13, 2020
Basis of presentation [Abstract]                
Gain from employee retention credit           $ 1,500    
Employee retention credit receivable $ 0   $ 0     $ 1,500 $ 1,500  
Operating expenses $ 7,725 $ 7,806 $ 25,801 $ 24,364        
Forecast [Member]                
Basis of presentation [Abstract]                
Operating expenses         $ (3,000)      
Sienna Credit Facility [Member]                
Basis of presentation [Abstract]                
Maximum borrowing capacity               $ 10,000