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Fair Value Measurements - Financial Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Short-term investments: |  |
Short-term investments | $ 7,233 |
Fair Value, Measurements, Recurring |  |
Financial assets |  |
Total | 108,662 | $ 136,204
Fair Value, Measurements, Recurring | Money Market Funds |  |
Cash and cash equivalents: |  |
Money market funds | 101,429 | 136,204
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Financial assets |  |
Total | 101,429 | 136,204
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Money Market Funds |  |
Cash and cash equivalents: |  |
Money market funds | 101,429 | $ 136,204
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Financial assets |  |
Total | 7,233 |
Fair Value, Measurements, Recurring | Short-term Investments - Corporate Bonds |  |
Short-term investments: |  |
Short-term investments | 7,233 |
Fair Value, Measurements, Recurring | Short-term Investments - Corporate Bonds | Significant Other Observable Inputs (Level 2) |  |
Short-term investments: |  |
Short-term investments | $ 7,233 |

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