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Related Party Transactions (Predecessor) - A1 Convertible Notes (Details)
$ in Millions
1 Months Ended 9 Months Ended 12 Months Ended
Dec. 15, 2021
USD ($)
item
Dec. 08, 2021
USD ($)
item
Jul. 21, 2023
USD ($)
Dec. 31, 2021
USD ($)
Sep. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
item
Mar. 06, 2023
USD ($)
Jul. 01, 2022
USD ($)
Jun. 03, 2022
USD ($)
Apr. 14, 2022
USD ($)
Mar. 09, 2022
USD ($)
Feb. 18, 2022
USD ($)
Related Party Transactions                        
Estimated fair value of convertible notes           $ 131.3            
Alphaeon 1 LLC (A1) | 2023 A1 Convertible Notes                        
Related Party Transactions                        
Aggregate principal amount             $ 6.0          
Alphaeon 1 LLC (A1) | A1 Purchase Agreement                        
Related Party Transactions                        
Aggregate principal amount       $ 25.0                
Alphaeon 1 LLC (A1) | A1 Purchase Agreement | 2021 A1 Convertible Notes                        
Related Party Transactions                        
Aggregate principal amount       $ 10.0                
Percentage of discount rate if number of days between execution date and conversion date are between zero and 90       10.00%                
Percentage of discount rate if number of days between execution date and conversion date are between 91 and 180       15.00%                
Percentage of discount rate if number of days between execution date and conversion date is grated than 180 days       20.00%                
Income (expense) related to change in fair value         $ (3.0) 0.6            
Principal amount outstanding           10.0            
Estimated fair value of convertible notes           8.7            
Alphaeon 1 LLC (A1) | A1 Purchase Agreement | A1 Convertible Notes issued on December 8, 2021                        
Related Party Transactions                        
Aggregate principal amount   $ 5.0                    
Number of convertible notes issued | item 2 2                    
Alphaeon 1 LLC (A1) | A1 Purchase Agreement | A1 Convertible Notes issued on December 15, 2021                        
Related Party Transactions                        
Aggregate principal amount $ 5.0                      
Alphaeon 1 LLC (A1) | A1 Purchase Agreement | 2022 A1 Convertible Notes                        
Related Party Transactions                        
Aggregate principal amount           14.5            
Interest rate (as a percent)       10.00%                
Income (expense) related to change in fair value         $ 4.2 1.0            
Principal amount outstanding           14.5            
Estimated fair value of convertible notes           $ 12.2            
Number of additional tranches of subordinated convertible promissory notes issued | item           5            
Alphaeon 1 LLC (A1) | A1 Purchase Agreement | A1 Convertible Notes, Issued on February 18, 2022                        
Related Party Transactions                        
Aggregate principal amount                       $ 3.0
Alphaeon 1 LLC (A1) | A1 Purchase Agreement | A1 Convertible Notes, Issued on 9th March, 2022                        
Related Party Transactions                        
Aggregate principal amount                     $ 3.0  
Alphaeon 1 LLC (A1) | A1 Purchase Agreement | A1 Convertible Notes, Issued on April 14, 2022                        
Related Party Transactions                        
Aggregate principal amount                   $ 3.0    
Alphaeon 1 LLC (A1) | A1 Purchase Agreement | A1 Convertible Notes, Issued on June 3, 2022                        
Related Party Transactions                        
Aggregate principal amount                 $ 3.0      
Alphaeon 1 LLC (A1) | A1 Purchase Agreement | A1 Convertible Notes, Issued on July 1, 2022                        
Related Party Transactions                        
Aggregate principal amount               $ 2.5        
Alphaeon 1 LLC (A1) | A1 Purchase Agreement | 2023 A1 Convertible Notes                        
Related Party Transactions                        
Interest rate (as a percent)             15.79%          
Alphaeon 1 LLC (A1) | A1 Purchase Agreement | March 2023 A1 Convertible Notes                        
Related Party Transactions                        
Income (expense) related to change in fair value     $ 10.1