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Stockholders' Equity (Deficit) - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Feb. 12, 2018
Dec. 14, 2017
Nov. 21, 2017
Aug. 31, 2018
Jul. 31, 2018
May 31, 2018
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Nov. 21, 2018
Class of Stock [Line Items]                    
Proceeds from follow-on offering, net of underwriting fees $ 56,300             $ 67,680 $ 0  
Stock issued during period, shares, new issues (in shares)         3,600,000          
Sale of stock, offering price (in dollars per share) $ 12.00     $ 20.00            
Preferred stock, shares authorized (in shares) 10,000,000             10,000,000 10,000,000  
Preferred stock, shares issued (in shares)               0 0  
Preferred stock, par value (in dollars per share) $ 0.00001             $ 0.00001 $ 0.00001  
Preferred stock, shares outstanding (in shares)               0 0  
Common stock, shares authorized (in shares) 100,000,000             100,000,000 100,000,000  
Common stock, shares, issued (in shares)               27,274,991 16,527,000  
Common stock, par value (in dollars per share) $ 0.00001             $ 0.00001 $ 0.00001  
Common stock, shares, outstanding (in shares)               27,274,991 16,527,000  
Contingent royalty obligation payable to Evolus Founders, a related party $ 39,700             $ 50,200 $ 0  
Contingent promissory note payable to Evolus Founders, a related party $ 16,000             16,904 0  
Payments on related party borrowings               (5,000) 0  
Capital contribution from Parent, forgiveness of related party borrowings               $ 13,188 0  
Maximum number of shares authorized under the plan (in shares)     4,361,291              
Annual increase percentage of maximum shares outstanding (equal to)     4.00%              
Additional shares reserved for issuance (in shares)                   1,091,000
Shares reserved for issuance (in shares)               1,888,484    
Weighted average contractual term               10 years    
Expected life in years               6 years    
Allocated stock-based compensation expense               $ 6,971 $ 586  
Options granted (in shares)               3,840,724    
Common stock options                    
Class of Stock [Line Items]                    
Weighted average contractual term               9 years 3 months 4 days    
Expected life in years               6 years 2 months 27 days 0 years  
Dividend yield rate               0.00% 0.00%  
Allocated stock-based compensation expense               $ 4,100    
Unrecognized stock option costs               $ 18,900    
Weighted average period for unrecognized costs to be recognized               3 years 3 months 19 days    
Options granted (in shares)               3,840,724    
Restricted stock units                    
Class of Stock [Line Items]                    
Allocated stock-based compensation expense               $ 1,300    
Unrecognized costs other than options               $ 2,800    
Weighted average period for unrecognized costs to be recognized               1 year 10 months 24 days    
Convertible Preferred Stock                    
Class of Stock [Line Items]                    
Preferred stock, shares authorized (in shares)               0 2,500,000  
Preferred stock, shares issued (in shares)               0 1,250,000  
Preferred stock, par value (in dollars per share)               $ 0.00001 $ 0.00001  
Preferred stock, shares outstanding (in shares)               0 1,250,000  
Common Stock | Convertible Preferred Stock                    
Class of Stock [Line Items]                    
Number of shares of convertible preferred stock converted (in shares) 2,065,875                  
Majority Shareholder                    
Class of Stock [Line Items]                    
Payments on related party borrowings             $ (5,000)      
Share-based Compensation Award, Tranche One | Chief Executive Officer                    
Class of Stock [Line Items]                    
Number of shares vested (in shares)           100,424        
Options granted (in shares)           34,602        
Share-based Compensation Award, Tranche Two | Chief Executive Officer                    
Class of Stock [Line Items]                    
Number of shares vested (in shares)           50,112        
General and administrative                    
Class of Stock [Line Items]                    
Allocated stock-based compensation expense               $ 5,570 $ 551  
General and administrative | Share-based Compensation Award, Tranche One | Chief Executive Officer                    
Class of Stock [Line Items]                    
Allocated stock-based compensation expense               $ 1,000    
General and administrative | Share-based Compensation Award, Tranche Two | Chief Executive Officer                    
Class of Stock [Line Items]                    
Allocated stock-based compensation expense           $ 500        
SCH | Evolus, Inc.                    
Class of Stock [Line Items]                    
Related party transaction amount in period $ 55,700 $ 20,000                
IPO                    
Class of Stock [Line Items]                    
Number of shares issued in transaction (in shares) 5,047,514                  
IPO | Common Stock                    
Class of Stock [Line Items]                    
Stock issued during period, shares, new issues (in shares)               5,047,514    
Underwriters Option                    
Class of Stock [Line Items]                    
Number of shares issued in transaction (in shares) 47,514                  
Stock issued during period, shares, new issues (in shares)       600,000            
Minimum                    
Class of Stock [Line Items]                    
Award vesting period               2 years    
Maximum                    
Class of Stock [Line Items]                    
Award vesting period               4 years