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Business Combination, Up-front Payment Upon Obtaining FDA Approval

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Related Party Transaction, Amounts Of Transaction Related To Contingent Royalty Obligation

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Related Party Transactions - Narrative (Details)					1 Months Ended			3 Months Ended	12 Months Ended
Related Party Transactions - Narrative (Details)	Feb. 01, 2019 USD ($)	Feb. 12, 2018 USD ($)	Dec. 14, 2017 USD ($)	Nov. 30, 2017 USD ($)	Jan. 31, 2018 USD ($)	Apr. 30, 2017 USD ($)	Oct. 31, 2013 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) transaction
Related Party Transaction [Line Items]
Payments on related party borrowings									$ (5,000,000)	$ 0
Related party receivable									0	72,639,000
Note obligation									0	138,687,000
Accumulated deficit									123,025,000	75,543,000
Deemed distribution to parent									(2,000,000)	(66,048,000)
Non-cash related party receivable									73,690,000	(72,639,000)
Liquidated damages									$ 1,000,000
Period in which liquidated damages will be awarded									30 days
Majority Shareholder
Related Party Transaction [Line Items]
Term of service agreement					1 year
Period of successive renewal of services agreement					1 year
Payments on related party borrowings								$ (5,000,000)
Related party receivable									$ 0	$ 72,600,000
Period available to cure breach			30 days
Unwinding fee				$ 9,600,000
Convertible Note \| Majority Shareholder
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%
Note obligation										$ 138,700,000
Convertible Note \| Bridge Note \| Majority Shareholder
Related Party Transaction [Line Items]
Face amount											$ 2,500,000.0
Convertible Note \| Purchase Agreement \| Majority Shareholder
Related Party Transaction [Line Items]
Face amount											$ 55,000,000
Additional amount authorized for issuance						$ 30,000,000
ALPHAEON
Related Party Transaction [Line Items]
Deemed distribution to parent										(66,100,000)
ALPHAEON \| Majority Shareholder
Related Party Transaction [Line Items]
Redemption price on debt									2.50%
Notes receivable from related parties									$ 56,300,000
Accumulated deficit									600,000	4,300,000
Total amounts of transaction									140,700,000	2,000,000
Non-cash related party receivable		$ 73,700,000			$ 1,100,000				73,690,000
Capital contribution		67,000,000
ALPHAEON
Related Party Transaction [Line Items]
Related party borrowings and non-cash capital contribution										2,500,000
ALPHAEON \| Chief Executive Officer
Related Party Transaction [Line Items]
Related party receivable									100,000
Related party transaction amount in period									800,000
Evolus, Inc.
Related Party Transaction [Line Items]
Due to related parties			$ 1,600,000
Percentage of voting interests acquired (at least)			50.00%
Evolus, Inc. \| SCH
Related Party Transaction [Line Items]
Related party transaction amount in period		55,700,000	$ 20,000,000
Amounts of transaction related to contingent royalty obligation		39,700,000
Amounts of transaction related to contingent promissory note		$ 16,000,000
Period of anniversary			2 years 6 months
Period of termination of first commercial sale			10 years
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
Contingent royalty obligation payable to Evolus Founders, a related party
Related Party Transaction [Line Items]
Contingent royalty obligation, fair value									50,200,000	$ 0
Change in fair value recorded in operating expenses									$ 10,500,000
Subsequent Event \| Evolus, Inc. \| Chief Medical Officer
Related Party Transaction [Line Items]
Due to related parties	$ 700,000
Subsequent Event \| Evolus, Inc. \| SCH
Related Party Transaction [Line Items]
Up-front payment upon obtaining FDA approval	$ 9,200,000