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Cash, Cash Equivalents and Investments (Tables) | 3 Months Ended
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Mar. 31, 2021
Cash, Cash Equivalents and Investments [Abstract] |
Summary of Cash, Cash Equivalents and Investments |
| As of March 31, 2021
|  |  | Gross |  | Gross |  |
| Amortized |  | unrealized |  | unrealized |  | Fair
| Cost |  | gains |  | losses |  | Value
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |
Cash and money market funds | $ | 906,453 |  | $ | — |  | $ | — |  | $ | 906,453
Commercial paper |  | 25,947 |  |  | — |  |  | (2) |  |  | 25,945
Total cash and cash equivalents |  | 932,400 |  |  | — |  |  | (2) |  |  | 932,398
Investments: |  |  |  |  |  |  |  |  |  |  |
Commercial paper |  | 75,470 |  |  | 2 |  |  | (7) |  |  | 75,465
Corporate debt securities |  | 15,492 |  |  | 63 |  |  | (7) |  |  | 15,548
U.S. government & agency securities |  | 136,883 |  |  | 29 |  |  | (4) |  |  | 136,908
Total investments |  | 227,845 |  |  | 94 |  |  | (18) |  |  | 227,921
Total cash, cash equivalents and investments | $ | 1,160,245 |  | $ | 94 |  | $ | (20) |  | $ | 1,160,319
Short-term restricted cash: |  |  |  |  |  |  |  |  |  |  |
Cash | $ | 836 |  | $ | — |  | $ | — |  | $ | 836
Long-term restricted cash: |  |  |  |  |  |  |  |  |  |  |
Cash | $ | 3,500 |  | $ | — |  | $ | — |  | $ | 3,500
| 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 | $ | 236,278
Due after one year through 5 years |  | 17,588
Total investments | $ | 253,866

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