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Organization (Details) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 12, 2018 USD ($) $ / shares shares | Aug. 31, 2018 $ / shares shares | Jul. 31, 2018 shares | Jan. 31, 2018 | Sep. 30, 2018 USD ($) $ / shares shares | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) $ / shares shares | Sep. 30, 2017 USD ($) | Nov. 01, 2018 | Jan. 06, 2018 $ / shares | Dec. 31, 2017 USD ($) $ / shares shares
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock split, conversion ratio |  |  |  | 1.6527 |  |  |  |  |  |  |
Sale of stock, offering price (in usd per share) | $ / shares | $ 12.00 | $ 20.00 |  |  |  |  |  |  |  | $ 12.00 |
Proceeds from initial public offering, net of underwriters fees | $ | $ 56,300 |  |  |  | $ 67,700 |  | $ 67,700 | $ 0 |  |  |
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) | $ / shares | $ 0.00001 |  |  |  | $ 0.00001 |  | $ 0.00001 |  |  |  | $ 0.00001
Preferred stock, shares authorized (in shares) | 10,000,000 |  |  |  | 10,000,000 |  | 10,000,000 |  |  |  | 10,000,000
Preferred stock, par value (in dollars per share) | $ / shares | $ 0.00001 |  |  |  | $ 0.00001 |  | $ 0.00001 |  |  |  | $ 0.00001
Number of shares sold upon completion of follow-on public offering (in shares) |  |  | 3,600,000 |  |  |  |  |  |  |  |
Net loss and comprehensive loss | $ |  |  |  |  | $ (11,830) | $ (2,634) | $ (34,425) | (8,928) |  |  |
Cash used in operations | $ |  |  |  |  |  |  | (13,661) | $ (12,222) |  |  |
Cash | $ |  |  |  |  | 105,168 |  | 105,168 |  |  |  | $ 0
Accumulated deficit | $ |  |  |  |  | $ (110,583) |  | $ (110,583) |  |  |  | $ (75,543)
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 |  | 0 |  |  |  | 2,500,000
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  |  | $ 0.00001 |  | $ 0.00001 |  |  |  | $ 0.00001
Common Stock |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares of convertible preferred stock converted (in shares) | 2,065,875 |  |  |  |  |  |  |  |  |  |
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 | ALPHAEON | Evolus, Inc. |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  |  | 58.10% |  |

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