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Organization (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended		3 Months Ended
	Feb. 12, 2018	Aug. 31, 2018	Jul. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Subsidiary, Sale of Stock [Line Items]
Sale of stock, offering price (in usd per share)	$ 12.00	$ 20.00
Proceeds from initial public offering, net of underwriters fees	$ 56,300			$ 67,700
Common stock, shares authorized (in shares)	100,000,000			100,000,000		100,000,000
Common stock, par value (in dollars per share)	$ 0.00001			$ 0.00001		$ 0.00001
Preferred stock, shares authorized (in shares)	10,000,000			10,000,000		10,000,000
Preferred stock, par value (in dollars per share)	$ 0.00001			$ 0.00001		$ 0.00001
Number of shares sold upon completion of follow-on public offering (in shares)			3,600,000
Net loss				$ (10,975)	$ (6,162)
Cash used in operations				(19,200)	$ (2,201)
Cash and cash equivalents				54,367		$ 93,162
Short-term investments				79,313		0
Accumulated deficit				$ 134,000		$ 123,025
ALPHAEON | Evolus, Inc.
Subsidiary, Sale of Stock [Line Items]
Ownership percentage				56.00%
IPO
Subsidiary, Sale of Stock [Line Items]
Number of shares issued in transaction (in shares)	5,047,514
Underwriters Option
Subsidiary, Sale of Stock [Line Items]
Number of shares issued in transaction (in shares)	47,514
Number of shares sold upon completion of follow-on public offering (in shares)		600,000
Common Stock | IPO
Subsidiary, Sale of Stock [Line Items]
Number of shares sold upon completion of follow-on public offering (in shares)					5,047,514
Common Stock | Convertible Preferred Stock
Subsidiary, Sale of Stock [Line Items]
Number of shares of convertible preferred stock converted (in shares)	2,065,875

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