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Fair Value Measurements - Unrealized Gains and Losses (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Cash equivalents |  |
Cash and cash equivalents | $ 92,250 | $ 43,759
Short-term marketable securities |  |
Fair Value | 33,922 | $ 49,620
Total | 53,827 |
Unrealized Gain | 21 |
Unrealized Loss | (2) |
Fair Value | 53,846 |
Money market funds |  |
Cash equivalents |  |
Cash and cash equivalents | 5,602 |
Unrealized Gain | 0 |
Unrealized Loss | 0 |
Fair Value | 5,602 |
Commercial paper |  |
Cash equivalents |  |
Cash and cash equivalents | 14,323 |
Unrealized Gain | 0 |
Unrealized Loss | (1) |
Fair Value | 14,322 |
Agency bonds |  |
Short-term marketable securities |  |
Amortized Cost | 26,805 |
Unrealized Gain | 21 |
Unrealized Loss | 0 |
Fair Value | 26,826 |
Commercial paper |  |
Short-term marketable securities |  |
Amortized Cost | 7,097 |
Unrealized Gain | 0 |
Unrealized Loss | (1) |
Fair Value | $ 7,096 |

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