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Related Party Transactions - Narrative (Details)					1 Months Ended			3 Months Ended			8 Months Ended	9 Months Ended		12 Months Ended
	Feb. 12, 2018 USD ($)	Jan. 16, 2018 USD ($)	Dec. 14, 2017 USD ($)	Nov. 30, 2017 USD ($)	Jan. 31, 2018	Apr. 30, 2017 USD ($)	Oct. 31, 2013 USD ($)	Sep. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) transaction
Related Party Transaction [Line Items]
Payments on related party borrowings												$ (5,000,000)	$ 0
Note obligation								$ 0		$ 138,687,000	$ 0	0		$ 138,687,000
Related party receivable								0		72,639,000	0	0		72,639,000
Deemed distribution to parent														(66,100,000)
Contingent royalty obligation payable to Evolus Founders, a related party	$ 40,600,000							51,100,000		0	51,100,000	51,100,000		0
Contingent promissory note payable to Evolus Founders, a related party	16,100,000							16,791,000		0	16,791,000	16,791,000		0
Liquidated damages												$ 1,000,000
Period in which liquidated damages will be awarded												30 days
ALPHAEON
Related Party Transaction [Line Items]
Term of service agreement					1 year
Period of successive renewal of services agreement					1 year
Period of notice of termination of services agreement					60 days
Related party accounts payable								0		72,600,000	0	$ 0		72,600,000
Redemption price on debt		2.50%
Total amounts of transaction		$ 140,700,000
Notes receivable from related parties		$ 56,300,000
Period available to cure breach			30 days
Unwinding fee				$ 9,600,000
Related party borrowings and non-cash capital contribution														$ 2,500,000
ALPHAEON | Chief Executive Officer
Related Party Transaction [Line Items]
Related party transaction amount in period												800,000
Related party receivable								100,000			100,000	100,000
ALPHAEON | Purchase Agreement
Related Party Transaction [Line Items]
Payments on related party borrowings										$ (2,500,000)
ALPHAEON | Convertible Note
Related Party Transaction [Line Items]
Debt instrument, number of debt transactions | transaction															2
Interest rate on debt															10.00%
Redemption price on debt						2.50%								2.50%	2.50%
ALPHAEON | Convertible Note | Bridge Note
Related Party Transaction [Line Items]
Face amount of debt															$ 2,500,000.0
ALPHAEON | Convertible Note | Purchase Agreement
Related Party Transaction [Line Items]
Face amount of debt															$ 55,000,000
Additional amount authorized for issuance						$ 30,000,000
Evolus, Inc.
Related Party Transaction [Line Items]
Due to related parties			$ 1,600,000
Percentage of voting interests acquired			50.00%
Evolus, Inc. | Chief Medical Officer
Related Party Transaction [Line Items]
Due to related parties			$ 700,000
Evolus, Inc. | SCH
Related Party Transaction [Line Items]
Related party transaction amount in period	$ 56,700,000		20,000,000
Up-front payment upon obtaining FDA approval			$ 9,200,000
Period of anniversary			2 years 6 months
Class D | Evolus, Inc. | SCH
Related Party Transaction [Line Items]
Ownership percentage							10.00%
Up-front payment upon obtaining FDA approval							$ 10,000,000
One-time lump sum payment							$ 145,000,000
IPO | ALPHAEON
Related Party Transaction [Line Items]
Payments on related party borrowings									$ (5,000,000)			(5,000,000)
Level 3
Related Party Transaction [Line Items]
Contingent royalty obligation payable to Evolus Founders, a related party								51,100,000			51,100,000	$ 51,100,000
Change in fair value								$ 2,300,000			$ 11,400,000

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