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Convertible Preferred Stock, activity in convertible preferred stock (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Convertible Preferred Stock        
Convertible preferred stock, beginning balance $ 164,006 $ 160,507 $ 160,507 $ 55,975
Issuances 39,968 3,499 3,499 104,532
Convertible preferred stock, ending balance   164,006 164,006 160,507
Series A-1 preferred stock        
Convertible Preferred Stock        
Convertible preferred stock, beginning balance 6,065 6,065 6,065 6,065
Convertible preferred stock, ending balance     6,065 6,065
Series A-2 preferred stock        
Convertible Preferred Stock        
Convertible preferred stock, beginning balance 8,976 8,976 8,976 8,976
Convertible preferred stock, ending balance     8,976 8,976
Series A-3 preferred stock        
Convertible Preferred Stock        
Convertible preferred stock, beginning balance 10,611 10,611 10,611 10,611
Convertible preferred stock, ending balance     10,611 10,611
Series A-4 preferred stock        
Convertible Preferred Stock        
Convertible preferred stock, beginning balance 1,993 1,993 1,993 1,993
Convertible preferred stock, ending balance     1,993 1,993
Series A-5 preferred stock        
Convertible Preferred Stock        
Convertible preferred stock, beginning balance 12,858 12,858 12,858 12,858
Convertible preferred stock, ending balance     12,858 12,858
Series A-6 preferred stock        
Convertible Preferred Stock        
Convertible preferred stock, beginning balance 15,476 15,476 15,476 15,472
Issuances       4
Convertible preferred stock, ending balance     15,476 15,476
Series B preferred stock        
Convertible Preferred Stock        
Convertible preferred stock, beginning balance 84,528 84,528 84,528  
Issuances       84,528
Convertible preferred stock, ending balance     84,528 84,528
Series B-1 preferred stock        
Convertible Preferred Stock        
Convertible preferred stock, beginning balance $ 23,499 $ 20,000 20,000  
Issuances     3,499 20,000
Convertible preferred stock, ending balance     $ 23,499 $ 20,000