Share-based Compensation Stock Incentive Plans - Share-based Award Activity (Details) $ / shares in Units, $ in Thousands				1 Months Ended	2 Months Ended	3 Months Ended	7 Months Ended	9 Months Ended		12 Months Ended
	Jul. 21, 2023 USD ($) $ / shares shares	Apr. 27, 2023 USD ($)	Jan. 06, 2023 USD ($)	Jul. 21, 2023 USD ($) $ / shares shares	Sep. 30, 2023 USD ($) $ / shares shares	Sep. 30, 2022 USD ($)	Jul. 21, 2023 USD ($) $ / shares shares	Sep. 30, 2023 USD ($) $ / shares shares	Sep. 30, 2022 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares
Other than options, Weighted Average Exercise Price
Common stock, shares outstanding					37,159,600			37,159,600		138,825,356
Priveterra | Intangible Assets Acquired
Other than options, Weighted Average Exercise Price
Fair value of the replacement awards | $	$ 13,300	$ 13,300	$ 13,331
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
AEON 2013 Stock Incentive Plan
Options, Number of Shares
Outstanding, beginning of period							9,694,890	9,694,890	10,516,525	10,516,525
Options forfeited										(821,635)
Options cancelled in connection with Merger								(9,694,890)
Outstanding, end of period										9,694,890
Exercisable, end of period										9,694,890
Options, Weighted Average Exercise Price
Outstanding, beginning of period | $ / shares							$ 1.53	$ 1.53	$ 1.51	$ 1.51
Options forfeited | $ / shares										1.23
Options cancelled in connection with Merger | $ / shares								$ 1.53
Outstanding, end of period | $ / shares										1.53
Exercisable, end of period | $ / shares										$ 1.53
Other than options, Weighted Average Exercise Price
Weighted average remaining contractual life of options outstanding										2 years 6 months
Aggregate intrinsic value of options outstanding | $										$ 300
Unrecognized compensation expense related to non-vested stock options | $					$ 0			$ 0		$ 0
Aggregate number of shares available for future grant										27,884,000
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 fair value of options granted per share | $ / shares										$ 488.02
Weighted average remaining contractual life of options outstanding								7 years 3 months 18 days		8 years 1 month 6 days
Share-based compensation expense | $	$ 1,000
Unrecognized compensation expense related to non-vested stock options | $					$ 5,700			$ 5,700		$ 12,300
Weighted-average remaining requisite service period for which unrecognized compensation expense related to nonvested stock options expected to be recognized								12 months		24 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			237,500	0		237,500	0
Options granted to purchase number of sub options	45,130			45,130			45,130
Options to purchase number of shares of common stock	3,515,219			3,515,219			3,515,219
Options to purchase number of RSU awards	15,059			15,059			15,059
RSU awards covering number of shares of common stock	1,169,366			1,169,366			1,169,366
Common stock, shares outstanding	127,801			127,801			127,801
ABP Sub Inc. 2019 Incentive Award Plan | Employee Stock Option
Options, Number of Shares
Outstanding, beginning of period							45,534	45,534	38,172	38,172
Options granted										16,437
Options forfeited							(404)			(9,075)
Outstanding, end of period	45,130			45,130			45,130			45,534
Exercisable, end of period	30,968			30,968			30,968			23,155
Options, Weighted Average Exercise Price
Outstanding, beginning of period | $ / shares							$ 958.75	$ 958.75	$ 986.36	$ 986.36
Options granted | $ / shares										898.58
Options forfeited | $ / shares							1,021.98			965.92
Outstanding, end of period | $ / shares	$ 959.06			$ 959.06			959.06			958.75
Exercisable, end of period | $ / shares	$ 956.64			$ 956.64			$ 956.64			$ 958.86
Other than options, Weighted Average Exercise Price
Share-based compensation expense | $				$ 200	$ 1,600	$ 1,100	$ 2,700		$ 4,200
ABP Sub Inc. 2019 Incentive Award Plan | Employee Stock Option | Successor period, July 22, 2023, to September 30, 2023
Options, Number of Shares
Outstanding, end of period	3,515,219			3,515,219	3,515,219		3,515,219	3,515,219
Options, Weighted Average Exercise Price
Outstanding, end of period | $ / shares	$ 10.00			$ 10.00	$ 10.00		$ 10.00	$ 10.00
ABP Sub Inc. 2019 Incentive Award Plan | Restricted stock units (unvested)
Other than options, Weighted Average Exercise Price
Number of awards contained vesting criteria	466,468
Amount of awards inlcuded in purchase consideration | $	$ 1,800
Share-based compensation expense | $				$ 100	$ 400		$ 500
Unrecognized compensation expense related to non-vested stock options | $					$ 10,500			$ 10,500
Weighted-average remaining requisite service period for which unrecognized compensation expense related to nonvested stock options expected to be recognized								33 months
ABP Sub Inc. 2019 Incentive Award Plan | Restricted stock units (unvested) | Successor period, July 22, 2023, to September 30, 2023
Other than options, Number of Shares
Granted					1,169,366
Outstanding, ending of period					1,169,366			1,169,366
Exercisable					127,801			127,801
Other than options, Weighted Average Exercise Price
Granted | $ / shares					$ 10.84
Outstanding, ending of period | $ / shares					10.84			$ 10.84
Exercisable | $ / shares					$ 10.84			$ 10.84
Share-based compensation expense | $					$ 400
AEON Biopharma Inc 2023 Incentive Award Plan
Options, Number of Shares
Options granted					331,753
Outstanding, end of period					331,753			331,753
Options, Weighted Average Exercise Price
Options granted | $ / shares					$ 5.47
Outstanding, end of period | $ / shares					$ 5.47			$ 5.47
Other than options, Weighted Average Exercise Price
Aggregate number of shares available for future grant	3,839,892			3,839,892			3,839,892
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
Other than options, Weighted Average Exercise Price
Weighted average fair value of options granted per share | $ / shares								$ 3.18
Weighted average remaining contractual life of options exercisable								9 years 10 months 24 days
Share-based compensation expense | $					$ 100
Unrecognized compensation expense related to non-vested stock options | $					$ 1,000			$ 1,000
Weighted-average remaining requisite service period for which unrecognized compensation expense related to nonvested stock options expected to be recognized								38 months