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Fair Value Measurements - Schedule of Fair Value of Company's Financial Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Assets |  |
Financial assets | $ 306,412 | $ 142,016
Money market funds |  |
Assets |  |
Financial assets | 59,823 | 13,897
U.S. government securities |  |
Assets |  |
Financial assets | 190,677 | 77,400
Corporate notes |  |
Assets |  |
Financial assets | 26,423 | 14,966
Commercial paper |  |
Assets |  |
Financial assets | 29,489 | 35,753
Level 1 |  |
Assets |  |
Financial assets | 59,823 | 13,897
Level 1 | Money market funds |  |
Assets |  |
Financial assets | 59,823 | 13,897
Level 1 | U.S. government securities |  |
Assets |  |
Financial assets | 0 | 0
Level 1 | Corporate notes |  |
Assets |  |
Financial assets | 0 | 0
Level 1 | Commercial paper |  |
Assets |  |
Financial assets | 0 | 0
Level 2 |  |
Assets |  |
Financial assets | 246,589 | 128,119
Level 2 | Money market funds |  |
Assets |  |
Financial assets | 0 | 0
Level 2 | U.S. government securities |  |
Assets |  |
Financial assets | 190,677 | 77,400
Level 2 | Corporate notes |  |
Assets |  |
Financial assets | 26,423 | 14,966
Level 2 | Commercial paper |  |
Assets |  |
Financial assets | 29,489 | 35,753
Level 3 |  |
Assets |  |
Financial assets | 0 | 0
Level 3 | Money market funds |  |
Assets |  |
Financial assets | 0 | 0
Level 3 | U.S. government securities |  |
Assets |  |
Financial assets | 0 | 0
Level 3 | Corporate notes |  |
Assets |  |
Financial assets | 0 | 0
Level 3 | Commercial paper |  |
Assets |  |
Financial assets | $ 0 | $ 0

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