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Share-Based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Number of shares      
Outstanding, Beginning of period 11,411,390    
Granted 3,348,982    
Forfeited (2,256,315)    
Expired (2,264,006)    
Outstanding, Ending of period 10,240,051   11,411,390
Vested and Exercisable at December 31, 2022 4,935,214    
Vested or expected to vest at December 31, 2022 10,240,051    
Weighted average exercise price per share      
Outstanding, Beginning of period $ 9.01    
Granted 1.06    
Forfeited 8.58    
Expired 12.50    
Outstanding, Ending of period 5.73   $ 9.01
Vested and Exercisable at December 31, 2022 8.43    
Vested or expected to vest at December 31, 2022 $ 5.73    
Weighted average remaining contractual term (years)      
Outstanding 8 years 2 months 12 days   7 years 1 month 6 days
Vested and Exercisable at December 31, 2022 7 years 4 months 24 days    
Vested or expected to vest at December 31, 2022 8 years 2 months 12 days    
Number of share options unvested and exercisable during the period 3,426    
Weighted average grant date fair value of options granted $ 0.82 $ 2.52  
Unrecognized compensation expense related to unvested stock option awards $ 12.4    
Stock option      
Weighted average remaining contractual term (years)      
Weighted average period for recognition 1 year 10 months 24 days