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Cash, Cash Equivalents and Investments (Tables) | 6 Months Ended
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Jun. 30, 2021
Cash, Cash Equivalents and Investments [Abstract] |
Summary of Cash, Cash Equivalents and Investments |
| As of June 30, 2021
|  |  | Gross |  | Gross |  |
| Amortized |  | unrealized |  | unrealized |  | Fair
| Cost |  | gains |  | losses |  | Value
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |
Cash and money market funds | $ | 263,433 |  | $ | — |  | $ | — |  | $ | 263,433
Commercial paper |  | 193,092 |  |  | — |  |  | (7) |  |  | 193,085
U.S. government & agency securities |  | 3,276 |  |  | — |  |  | — |  |  | 3,276
Total cash and cash equivalents |  | 459,801 |  |  | — |  |  | (7) |  |  | 459,794
Investments: |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  | 173,929 |  |  | 23 |  |  | (6) |  |  | 173,946
Corporate debt securities |  | 13,629 |  |  | 52 |  |  | — |  |  | 13,681
U.S. government & agency securities |  | 497,020 |  |  | 29 |  |  | (97) |  |  | 496,952
Total investments |  | 684,578 |  |  | 104 |  |  | (103) |  |  | 684,579
Total cash, cash equivalents and investments | $ | 1,144,379 |  | $ | 104 |  | $ | (110) |  | $ | 1,144,373
Short-term restricted cash: |  |  |  |  |  |  |  |  |  |  |
Cash | $ | 300 |  | $ | — |  | $ | — |  | $ | 300
Long-term restricted cash: |  |  |  |  |  |  |  |  |  |  |
Cash | $ | 3,000 |  | $ | — |  | $ | — |  | $ | 3,000
| As of December 31, 2020
|  |  | Gross |  | Gross |  |
| Amortized |  | unrealized |  | unrealized |  | Fair
| Cost |  | gains |  | losses |  | Value
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |
Cash and money market funds | $ | 43,040 |  | $ | — |  | $ | — |  | $ | 43,040
Commercial paper |  | 32,538 |  |  | — |  |  | (1) |  |  | 32,537
U.S. government & agency securities |  | 170 |  |  | — |  |  | — |  |  | 170
U.S. Treasury security |  | 5,864 |  |  | — |  |  | — |  |  | 5,864
Total cash and cash equivalents |  | 81,612 |  |  | — |  |  | (1) |  |  | 81,611
Investments: |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  | 112,648 |  |  | 4 |  |  | (8) |  |  | 112,644
Corporate debt securities |  | 17,360 |  |  | 96 |  |  | — |  |  | 17,456
U.S. government & agency securities |  | 107,109 |  |  | 6 |  |  | (12) |  |  | 107,103
Total investments |  | 237,117 |  |  | 106 |  |  | (20) |  |  | 237,203
Total cash, cash equivalents and investments | $ | 318,729 |  | $ | 106 |  | $ | (21) |  | $ | 318,814
Short-term restricted cash: |  |  |  |  |  |  |  |  |  |  |
Cash | $ | 836 |  | $ | — |  | $ | — |  | $ | 836
Long-term restricted cash: |  |  |  |  |  |  |  |  |  |  |
Cash | $ | 3,500 |  | $ | — |  | $ | — |  | $ | 3,500
Summary of Contractual Maturities of Cash Equivalents and Available-for-Sale Investments |
| Fair Value
Due in one year or less | $ | 574,297
Due after one year through 5 years |  | 306,643
Total investments | $ | 880,940

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