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Organization (Details)
 1 Months Ended 12 Months Ended
Feb. 12, 2018
USD ($)
$ / shares
shares
Aug. 31, 2018
$ / shares
shares
Jul. 31, 2018
shares
Jan. 31, 2018
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Mar. 15, 2019
USD ($)
Subsidiary, Sale of Stock [Line Items]              
Stock split, conversion ratio       1.6527      
Sale of stock, offering price (in dollars per share) | $ / shares $ 12.00 $ 20.00          
Proceeds from initial public offering, net of underwriters fees | $ $ 56,300,000       $ 56,330,000 $ 0  
Common stock, shares authorized (in shares) 100,000,000       100,000,000 100,000,000  
Common stock, par value (in dollars per share) | $ / shares $ 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) | $ / shares $ 0.00001       $ 0.00001 $ 0.00001  
Number of shares sold upon completion of follow-on public offering (in shares)     3,600,000        
Proceeds from follow-on offering, net of underwriting fees | $ $ 56,300,000       $ 67,680,000 $ 0  
Net loss | $         (46,867,000) (4,480,000)  
Cash used in operations | $         (25,667,000) (13,222,000)  
Cash | $         93,162,000 0  
Accumulated deficit | $         $ (123,025,000) $ (75,543,000)  
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 2,500,000  
Preferred stock, par value (in dollars per share) | $ / shares         $ 0.00001 $ 0.00001  
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            
Subsequent Event | Majority Shareholder | Evolus, Inc.              
Subsidiary, Sale of Stock [Line Items]              
Ownership percentage             56.00%
Oxford Finance, LLC | Subsequent Event              
Subsidiary, Sale of Stock [Line Items]              
Maximum borrowing capacity | $             $ 100,000,000