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Summary of Significant Accounting Policies (Details) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2013 shares | Dec. 31, 2018 USD ($) unit | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |
Number of reporting units | unit |  | 1 |  |
Impairment of goodwill |  | $ 0 |  |
Impairment of intangible assets |  | 0 | $ 0 | $ 0
Deferred costs offset against IPO proceeds |  | 3,200,000 |  |
Deferred offering costs |  | 0 | $ 2,100,000 |
Provisional decrease in valuation allowance |  | 9,600,000 |  |
Reduction in net deferred tax liability |  | $ 6,300,000 |  |
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 |  |  |
Majority Shareholder | Minimum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Useful lives of property and equipment |  | 3 years |  |
Majority Shareholder | Maximum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Useful lives of property and equipment |  | 5 years |  |

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