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Summary of Significant Accounting Policies (Details)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2013
shares
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
unit
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Property, Plant and Equipment [Line Items]            
Number of reporting units | unit       1    
Impairment of goodwill       $ 0    
Impairment of intangible assets       0    
Deferred costs offset against IPO proceeds   $ 3,200,000   3,200,000    
Deferred offering costs   0   0   $ 2,100,000
Allocated stock-based compensation expense   1,482,000 $ 226,000 5,111,000 $ 472,000  
Provisional decrease in net deferred tax assets           3,200,000
Provisional decrease in valuation allowance           9,600,000
Provisional income tax benefit           $ 6,300,000
ALPHAEON            
Property, Plant and Equipment [Line Items]            
Allocated stock-based compensation expense   $ 0   $ 30,000    
ALPHAEON | Minimum            
Property, Plant and Equipment [Line Items]            
Useful lives of property and equipment       3 years    
ALPHAEON | Maximum            
Property, Plant and Equipment [Line Items]            
Useful lives of property and equipment       5 years    
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