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Organization (Details) $ / shares in Units, $ in Thousands		1 Months Ended			3 Months Ended		9 Months Ended
	Feb. 12, 2018 USD ($) $ / shares shares	Aug. 31, 2018 $ / shares shares	Jul. 31, 2018 shares	Jan. 31, 2018	Sep. 30, 2018 USD ($) $ / shares shares	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) $ / shares shares	Sep. 30, 2017 USD ($)	Nov. 01, 2018	Jan. 06, 2018 $ / shares	Dec. 31, 2017 USD ($) $ / shares shares
Subsidiary, Sale of Stock [Line Items]
Stock split, conversion ratio				1.6527
Sale of stock, offering price (in usd per share) | $ / shares	$ 12.00	$ 20.00								$ 12.00
Proceeds from initial public offering, net of underwriters fees | $	$ 56,300				$ 67,700		$ 67,700	$ 0
Common stock, shares authorized (in shares)	100,000,000				100,000,000		100,000,000				20,000,000
Common stock, par value (in dollars per share) | $ / shares	$ 0.00001				$ 0.00001		$ 0.00001				$ 0.00001
Preferred stock, shares authorized (in shares)	10,000,000				10,000,000		10,000,000				10,000,000
Preferred stock, par value (in dollars per share) | $ / shares	$ 0.00001				$ 0.00001		$ 0.00001				$ 0.00001
Number of shares sold upon completion of follow-on public offering (in shares)			3,600,000
Net loss and comprehensive loss | $					$ (11,830)	$ (2,634)	$ (34,425)	(8,928)
Cash used in operations | $							(13,661)	$ (12,222)
Cash | $					105,168		105,168				$ 0
Accumulated deficit | $					$ (110,583)		$ (110,583)				$ (75,543)
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
Convertible Preferred Stock
Subsidiary, Sale of Stock [Line Items]
Preferred stock, shares authorized (in shares)					0		0				2,500,000
Preferred stock, par value (in dollars per share) | $ / shares					$ 0.00001		$ 0.00001				$ 0.00001
Common Stock
Subsidiary, Sale of Stock [Line Items]
Number of shares of convertible preferred stock converted (in shares)	2,065,875
Common Stock | Convertible Preferred Stock
Subsidiary, Sale of Stock [Line Items]
Number of shares of convertible preferred stock converted (in shares)	2,065,875
Subsequent Event | ALPHAEON | Evolus, Inc.
Subsidiary, Sale of Stock [Line Items]
Ownership percentage									58.10%

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