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Related Party Transactions (Details)					1 Months Ended	3 Months Ended	12 Months Ended
	Feb. 12, 2018 USD ($)	Feb. 11, 2018 USD ($)	Dec. 14, 2017 USD ($)	Nov. 30, 2017 USD ($)	Jan. 31, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Feb. 28, 2019 USD ($)
Related Party Transaction [Line Items]
Payments on related party borrowings							$ 0	$ 5,000,000
Accumulated deficit							213,059,000	123,025,000
Increase in related party receivable							0	73,690,000
Deemed distribution to parent								2,000,000
Contingent royalty obligation payable to Evolus Founders	$ 39,700,000						41,200,000	50,200,000
Contingent promissory note payable to Evolus Founders	16,042,000						17,945,000	16,904,000
ALPHAEON
Related Party Transaction [Line Items]
Period available to cure breach			30 days
Unwinding fee				$ 9,600,000
ALPHAEON | Majority Shareholder
Related Party Transaction [Line Items]
Related party transaction amount in period	$ 140,688,000	$ 56,275,000				$ 800,000
Term of service agreement					1 year
Period of successive renewal of services agreement					1 year
Period to notify termination to the other party					60 days
Payments on related party borrowings						5,000,000
Related party receivable							$ 0	0
Related party transaction, debt balance multiplier	2.5
Accumulated deficit		$ 615,000
Increase in related party receivable					$ 1,051,000
Related party receivable					$ 73,690,000
Deemed distribution to parent	$ 66,998,000
ALPHAEON | Chief Executive Officer
Related Party Transaction [Line Items]
Related party transaction amount in period						$ 24,000
Evolus, Inc.
Related Party Transaction [Line Items]
Due to related parties									$ 1,575,000
Percentage of voting interests acquired (at least)			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	$ 55,742,000		$ 20,000,000
Up-front payment upon obtaining FDA approval			$ 9,200,000
Period of termination of first commercial sale			10 years
Selling, general and administrative expenses | ALPHAEON
Related Party Transaction [Line Items]
Related party transaction amount in period								383,000
Research and development | ALPHAEON
Related Party Transaction [Line Items]
Related party transaction amount in period								$ 0

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