Share-based Compensation - Stock Option Activity Under 2023 Incentive Award Plan (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Options, Weighted Average Exercise Price
Share-based compensation expense	$ 1.7	$ 1.6
AEON Biopharma Inc 2023 Incentive Award Plan \| Stock options
Options, Number of Shares
Outstanding, beginning of period	51,016
Outstanding, end of period	51,016		51,016
Exercisable, end of period	18,280
Options, Weighted Average Exercise Price
Outstanding, beginning of period	$ 242.14
Outstanding, end of period	242.14		$ 242.14
Exercisable, end of period	$ 78.93
Weighted average fair value of options granted per share			$ 135.5
Weighted average remaining contractual life of options exercisable	9 years 2 months 12 days		9 years 6 months
Share-based compensation expense	$ 0.6	$ 0.1
Unrecognized compensation expense related to non-vested stock options	$ 4.7		$ 5.3
Weighted-average remaining requisite service period for which unrecognized compensation expense	16 months		19 months

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cost to be recognized for option under share-based payment arrangement.

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