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Stockholder's Equity (Deficit) - Narrative (Details) - USD ($) |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
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Feb. 19, 2018 | Feb. 12, 2018 | Jan. 06, 2018 | Dec. 14, 2017 | Nov. 21, 2017 | Aug. 31, 2018 | Jul. 31, 2018 | May 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from initial public offering, net of underwriters fees |  | $ 56,300,000 |  |  |  |  |  |  | $ 67,700,000 |  |  |  | $ 67,700,000 | $ 0 |
Number of shares sold upon completion of follow-on public offering (in shares) |  |  |  |  |  |  | 3,600,000 |  |  |  |  |  |  |  |
Sale of stock, offering price (in usd per share) |  | $ 12.00 | $ 12.00 |  |  | $ 20.00 |  |  |  |  |  |  |  |  |
Proceeds from follow-on offering, net of underwriters fees |  |  |  |  |  |  |  |  |  |  |  |  | $ 56,330,000 | 0 |
Preferred stock, shares authorized (in shares) |  | 10,000,000 |  |  |  |  |  |  | 10,000,000 |  |  |  | 10,000,000 |  | 10,000,000
Preferred stock, shares issued (in shares) |  |  |  |  |  |  |  |  | 0 |  |  |  | 0 |  | 0
Preferred stock, shares outstanding (in shares) |  |  |  |  |  |  |  |  | 0 |  |  |  | 0 |  | 0
Preferred stock, par value (in dollars per share) |  | $ 0.00001 |  |  |  |  |  |  | $ 0.00001 |  |  |  | $ 0.00001 |  | $ 0.00001
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) |  | $ 0.00001 |  |  |  |  |  |  | $ 0.00001 |  |  |  | $ 0.00001 |  | $ 0.00001
Common stock, shares, issued (in shares) |  |  |  |  |  |  |  |  | 27,274,991 |  |  |  | 27,274,991 |  | 16,527,000
Common stock, shares, outstanding (in shares) |  |  |  |  |  |  |  |  | 27,274,991 |  |  |  | 27,274,991 |  | 16,527,000
Contingent royalty obligation payable to Evolus Founders, a related party |  | $ 40,600,000 |  |  |  |  |  |  | $ 51,100,000 |  |  |  | $ 51,100,000 |  | $ 0
Contingent promissory note payable to Evolus Founders, a related party |  | 16,100,000 |  |  |  |  |  |  | $ 16,791,000 |  |  |  | 16,791,000 |  | $ 0
Payments on related party borrowings |  |  |  |  |  |  |  |  |  |  |  |  | (5,000,000) | 0 |
Capital contribution from parent, forgiveness of related party borrowings |  |  |  |  |  |  |  |  |  |  |  |  | 13,188,000 | 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% |  |  |  |  |  |  |  |  |  |
Options granted (in shares) | 102,835 |  | 1,496,005 |  |  |  |  |  | 349,240 | 1,570,145 |  |  |  |  |
Exercise price of options granted (in dollars per share) | $ 11.70 |  | $ 9.98 |  |  |  |  |  | $ 20.55 | $ 10.85 |  |  |  |  |
Allocated stock-based compensation expense |  |  |  |  |  |  |  |  | $ 1,482,000 |  |  | $ 226,000 | 5,111,000 | 472,000 |
Restricted stock units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted (in shares) |  |  |  |  |  |  |  |  | 11,000 | 80,000 |  |  |  |  |
Exercise price of options granted (in dollars per share) |  |  | $ 9.98 |  |  |  |  |  | $ 21.21 | $ 26.22 |  |  |  |  |
Equity instruments other than options granted (in shares) |  |  | 230,516 |  |  |  |  |  |  |  |  |  |  |  |
ALPHAEON |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allocated stock-based compensation expense |  |  |  |  |  |  |  |  | $ 0 |  |  |  | 30,000 |  |
Evolus, Inc. | SCH |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party transaction amount in period |  | $ 56,700,000 |  | $ 20,000,000 |  |  |  |  |  |  |  |  |  |  |
Chief Executive Officer | Initial issuance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted (in shares) |  |  |  |  |  |  |  | 50,112 |  |  |  |  |  |  |
Number of shares vested (in shares) |  |  |  |  |  |  |  | 100,424 |  |  |  |  |  |  |
Chief Executive Officer | Secondary issuance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares vested (in shares) |  |  |  |  |  |  |  | 50,112 |  |  |  |  |  |  |
Chief Executive Officer | ALPHAEON |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party transaction amount in period |  |  |  |  |  |  |  |  |  |  |  |  | 800,000 |  |
General and administrative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allocated stock-based compensation expense |  |  |  |  |  |  |  |  | 1,160,000 |  |  | $ 215,000 | $ 4,083,000 | $ 447,000 |
General and administrative | Chief Executive Officer | Initial issuance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allocated stock-based compensation expense |  |  |  |  |  |  |  |  | $ 1,000,000 |  |  |  |  |  |
General and administrative | Chief Executive Officer | Secondary issuance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allocated stock-based compensation expense |  |  |  |  |  |  |  | $ 400,000 |  |  |  |  |  |  |
Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  |  |  |  |  |  |  | 0 |  |  |  | 0 |  | 2,500,000
Preferred stock, shares issued (in shares) |  |  |  |  |  |  |  |  | 0 |  |  |  | 0 |  | 1,250,000
Preferred stock, shares outstanding (in shares) |  |  |  |  |  |  |  |  | 0 |  |  |  | 0 |  | 1,250,000
Preferred stock, par value (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.00001 |  |  |  | $ 0.00001 |  | $ 0.00001
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares of convertible preferred stock converted (in shares) |  | 2,065,875 |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock | Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares of convertible preferred stock converted (in shares) |  | 2,065,875 |  |  |  |  |  |  |  |  |  |  |  |  |
IPO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued in transaction (in shares) |  | 5,047,514 |  |  |  |  |  |  |  |  |  |  |  |  |
IPO | ALPHAEON |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments on related party borrowings |  |  |  |  |  |  |  |  |  |  | $ (5,000,000) |  | $ (5,000,000) |  |
Underwriters Option |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class 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 |  |  |  |  |  |  |  |  |

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