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Fair Value Measurements and Short-Term Investments - Narrative (Details)
 12 Months Ended
Dec. 31, 2019
USD ($)
year
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Fair Value Disclosures [Abstract]      
Investments in a continuous loss position for more than 12 months $ 0    
Other-than-temporary Impairments recorded on investments 0    
Contingent Royalty Obligation      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Contingent royalty obligation payable to Evolus Founders 44,683,000 $ 50,200,000 $ 0
Fair Value      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Contingent promissory note payable 16,696,000    
Contingent royalty obligation payable to Evolus Founders   $ 17,181,000  
Fair Value | Oxford Term Loans      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Contingent promissory note payable $ 76,203,000    
Measurement Input, Expected Term | Contingent Royalty Obligation      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Measurement input | year 10    
Measurement Input, Discount Rate | Minimum | Contingent Royalty Obligation      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Measurement input 0.160    
Measurement Input, Discount Rate | Maximum | Contingent Royalty Obligation      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Measurement input   0.250