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Cash Equivalents and Investments - Schedule of Fair Value of Securities, not Including Cash (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 306,401 | $ 141,934
Gross Unrealized Gains | 18 | 83
Gross Unrealized Losses | (7) | (1)
Estimated Fair Value | 306,412 | 142,016
Classified as: |  |
Cash equivalents | 59,823 | 13,897
Short-term investments | 246,589 | 120,089
Long-term investments | 0 | 8,030
Total cash equivalents and available-for-sale investments | 306,412 | 142,016
U.S. government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 190,663 | 77,329
Gross Unrealized Gains | 16 | 72
Gross Unrealized Losses | (2) | (1)
Estimated Fair Value | 190,677 | 77,400
Corporate notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 26,426 | 14,955
Gross Unrealized Gains | 2 | 11
Gross Unrealized Losses | (5) | 0
Estimated Fair Value | 26,423 | 14,966
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 29,489 | 35,753
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 29,489 | 35,753
Money market funds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 59,823 | 13,897
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | $ 59,823 | $ 13,897

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