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Share-based Compensation - Restricted Stock Units Activity Under 2019 Incentive Award Plan (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Other than options, Weighted Average Exercise Price          
Share-based compensation expense $ 1.0 $ 1.6 $ 4.4 $ 4.9  
ABP Sub Inc. 2019 Incentive Award Plan          
Other than options, Weighted Average Exercise Price          
Unrecognized compensation expense related to non-vested stock options $ 0.5   $ 0.5   $ 1.8
Weighted-average remaining requisite service period for which unrecognized compensation expense     1 month   4 months
RSU | ABP Sub Inc. 2019 Incentive Award Plan          
Other than options, Number of Shares          
Outstanding, beginning of period     11,398    
Vested     (1,639)    
Outstanding, ending of period 9,759   9,759   11,398
Other than options, Weighted Average Exercise Price          
Outstanding, beginning of period     $ 780.48    
Outstanding, ending of period $ 780.48   $ 780.48   $ 780.48
Share-based compensation expense $ 0.3 0.3 $ 1.0 1.1  
Share-based compensation expense related   $ 0.1   $ 0.5  
Share-based compensation expense reversal 1.0   1.0    
Unrecognized compensation expense related to non-vested stock options 2.0   $ 2.0   $ 3.0
Weighted-average remaining requisite service period for which unrecognized compensation expense     14 months   21 months
RSU | ABP Sub Inc. 2019 Incentive Award Plan | Earnout Vesting          
Other than options, Weighted Average Exercise Price          
Unrecognized compensation expense related to other than options $ 5.1   $ 5.1   $ 4.3