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Fair Value Measurements and Short-Term Investments - Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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U.S treasury securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale debt securities | $ 19,911 |
U.S treasury securities | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale debt securities | 19,911 |
U.S treasury securities | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale debt securities | 0 |
U.S treasury securities | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Available-for-sale debt securities | 0 |
Contingent royalty obligation payable to Evolus Founders |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Contingent royalty obligation payable to Evolus Founders | 44,683 | $ 50,200
Contingent royalty obligation payable to Evolus Founders | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Contingent royalty obligation payable to Evolus Founders | 0 | 0
Contingent royalty obligation payable to Evolus Founders | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Contingent royalty obligation payable to Evolus Founders | 0 | 0
Contingent royalty obligation payable to Evolus Founders | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Contingent royalty obligation payable to Evolus Founders | $ 44,683 | $ 50,200

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