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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 |  |  |  |  |

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