Summary of Significant Accounting Policies (Details)	1 Months Ended	12 Months Ended
	Oct. 31, 2013 shares	Dec. 31, 2018 USD ($) unit	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Property, Plant and Equipment [Line Items]
Number of reporting units | unit		1
Impairment of goodwill		$ 0
Impairment of intangible assets		0	$ 0	$ 0
Deferred costs offset against IPO proceeds		3,200,000
Deferred offering costs		0	$ 2,100,000
Provisional decrease in valuation allowance		9,600,000
Reduction in net deferred tax liability		$ 6,300,000
SCH | Evolus, Inc. | Class AA
Property, Plant and Equipment [Line Items]
Number of shares issued as part of business acquisition (in shares) | shares	15,000
SCH | Evolus, Inc. | Class D
Property, Plant and Equipment [Line Items]
Number of shares issued as part of business acquisition (in shares) | shares	15,000
Majority Shareholder | Minimum
Property, Plant and Equipment [Line Items]
Useful lives of property and equipment		3 years
Majority Shareholder | Maximum
Property, Plant and Equipment [Line Items]
Useful lives of property and equipment		5 years