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Fair Value Measurements - Narrative (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
year
Level 2 | Contingent royalty obligation payable to Evolus Founders, a related party  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Contingent promissory note payable | $ $ 20,000,000.0
Maturity term of debt 2 years 6 months
Contingent Royalty Obligation | Measurement Input, Expected Term  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Measurement input | year 10
Contingent Royalty Obligation | Minimum | Measurement Input, Discount Rate  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Measurement input 0.18
Contingent Royalty Obligation | Maximum | Measurement Input, Discount Rate  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Measurement input 0.25