Share-based Compensation Stock Incentive Plans - Share-based Award Activity (Details) $ / shares in Units, $ in Thousands				3 Months Ended		12 Months Ended
	Mar. 31, 2024 USD ($) $ / shares shares	Jul. 21, 2023 USD ($) $ / shares shares	Apr. 27, 2023 USD ($)	Mar. 31, 2024 USD ($) $ / shares shares	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($) $ / shares shares
Other than options, Weighted Average Exercise Price
Common stock, shares outstanding	38,120,288			38,120,288		37,159,600
Priveterra | Intangible Assets Acquired
Other than options, Weighted Average Exercise Price
Fair value of the replacement awards | $	$ 13,331	$ 13,300	$ 13,300
Priveterra | Intangible Assets Acquired | Employee Stock Option
Other than options, Weighted Average Exercise Price
Fair value of the replacement awards | $			11,500
Priveterra | Intangible Assets Acquired | Restricted stock units (unvested)
Other than options, Weighted Average Exercise Price
Fair value of the replacement awards | $			$ 1,800
ABP Sub Inc. 2019 Incentive Award Plan
Options, Weighted Average Exercise Price
Options granted | $ / shares		$ 10.00
Other than options, Weighted Average Exercise Price
Weighted average remaining contractual life of options outstanding				6 years 9 months 18 days		7 years 1 month 6 days
Share-based compensation expense | $		$ 1,000
Unrecognized compensation expense related to non-vested stock options | $	$ 4,100			$ 4,100		$ 4,900
Weighted-average remaining requisite service period for which unrecognized compensation expense related to nonvested stock options expected to be recognized				9 months		10 months
Conversion ratio of options and RSU awards that were outstanding immediately prior to the Merger to common stock		77.65
Aggregate number of shares available for future grant		237,500				0
Options granted to purchase number of sub options		45,130
Options to purchase number of shares of common stock		3,515,219
Options to purchase number of RSU awards		15,059
RSU awards covering number of shares of common stock		1,169,366
Common stock, shares outstanding		127,801
ABP Sub Inc. 2019 Incentive Award Plan | Employee Stock Option
Options, Number of Shares
Outstanding, beginning of period				3,515,219
Outstanding, end of period	3,515,219			3,515,219		3,515,219
Options, Weighted Average Exercise Price
Outstanding, beginning of period | $ / shares				$ 10.00
Outstanding, end of period | $ / shares	$ 10.00			$ 10.00		$ 10.00
Other than options, Weighted Average Exercise Price
Share-based compensation expense | $				$ 800	$ 1,400
ABP Sub Inc. 2019 Incentive Award Plan | Restricted stock units (unvested)
Other than options, Number of Shares
Outstanding, beginning of period				1,012,994
Forfeited				(21,428)
Outstanding, ending of period	991,566			991,566		1,012,994
Other than options, Weighted Average Exercise Price
Outstanding, beginning of period | $ / shares				$ 10.84
Forfeited | $ / shares				10.84
Outstanding, ending of period | $ / shares	$ 10.84			$ 10.84		$ 10.84
Number of awards contained vesting criteria		466,468
Amount of awards inlcuded in purchase consideration | $		$ 1,800
Share-based compensation expense | $				$ 700
Weighted-average remaining requisite service period for which unrecognized compensation expense related to nonvested stock options expected to be recognized				28 months
Unrecognized compensation expense related to other than options | $	$ 8,500			$ 8,500
ABP Sub Inc. 2019 Incentive Award Plan | Restricted stock units (unvested) | Earnout Vesting
Other than options, Weighted Average Exercise Price
Share-based compensation expense | $				200
Unrecognized compensation expense related to other than options | $	4,400			4,400
ABP Sub Inc. 2019 Incentive Award Plan | Restricted stock units (unvested) | Non Earnout Vesting
Other than options, Weighted Average Exercise Price
Unrecognized compensation expense related to other than options | $	$ 4,100			4,100
ABP Sub Inc. 2019 Incentive Award Plan | Restricted stock units (unvested) | Successor period, July 22, 2023, to September 30, 2023
Other than options, Weighted Average Exercise Price
Share-based compensation expense | $				$ 200
AEON Biopharma Inc 2023 Incentive Award Plan
Other than options, Weighted Average Exercise Price
Aggregate number of shares available for future grant	2,859,778	3,839,892		2,859,778
Percentage of fully-diluted shares outstanding considered for annual increase of shares available for issuance		4.00%
AEON Biopharma Inc 2023 Incentive Award Plan | Employee Stock Option
Options, Number of Shares
Outstanding, beginning of period				331,753
Options granted				698,360
Outstanding, end of period	1,030,113			1,030,113		331,753
Options, Weighted Average Exercise Price
Outstanding, beginning of period | $ / shares				$ 5.47
Options granted | $ / shares				13.26
Outstanding, end of period | $ / shares	$ 10.75			10.75		$ 5.47
Other than options, Weighted Average Exercise Price
Weighted average fair value of options granted per share | $ / shares				$ 5.70		$ 3.18
Weighted average remaining contractual life of options exercisable				9 years 9 months 18 days		9 years 7 months 6 days
Share-based compensation expense | $				$ 100
Unrecognized compensation expense related to non-vested stock options | $	$ 5,600			$ 5,600		$ 900
Weighted-average remaining requisite service period for which unrecognized compensation expense related to nonvested stock options expected to be recognized				42 months		35 months