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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 |

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