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Cash and Cash Equivalents, and Investments (Tables) | 9 Months Ended
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Sep. 30, 2020
Cash and Cash Equivalents [Abstract] |
Cash, Cash Equivalents and Investments | The following tables show our cash and cash equivalents, and investments’ adjusted cost, unrealized gain, unrealized loss, and fair value as of September 30, 2020 and December 31, 2019 (in thousands):
| September 30, 2020 |  |  |  |  |  |
| Adjusted Cost |  | Unrealized Gain |  | Unrealized Loss |  | Fair Value
Cash and cash equivalents: |  |  |  |  |  |  |
Cash | $ | 17,346 |  |  | $ | — |  |  | $ | — |  |  | $ | 17,346 |
U.S. treasury securities | 307,673 |  |  | — |  |  | — |  |  | 307,673 |
Money market funds | 202,522 |  |  | — |  |  | — |  |  | 202,522 |
Total cash and cash equivalents | $ | 527,541 |  |  | $ | — |  |  | $ | — |  |  | $ | 527,541 |
Short-term investments: |  |  |  |  |  |  |
Commercial paper | $ | 204,044 |  |  | $ | 38 |  |  | $ | (24) |  |  | $ | 204,058 |
Corporate securities | 516,682 |  |  | 2,644 |  |  | (57) |  |  | 519,269 |
Total short-term investments | $ | 720,726 |  |  | $ | 2,682 |  |  | $ | (81) |  |  | $ | 723,327 |
Long-term investments: |  |  |  |  |  |  |
Corporate securities | $ | 456,774 |  |  | $ | 602 |  |  | $ | (635) |  |  | $ | 456,741 |
Agency bonds | 64,495 |  |  | 25 |  |  | — |  |  | 64,520 |
Total long-term investments | $ | 521,269 |  |  | $ | 627 |  |  | $ | (635) |  |  | $ | 521,261 |
| December 31, 2019 |  |  |  |  |  |
| Adjusted Cost |  | Unrealized Gain |  | Unrealized Loss |  | Fair Value
Cash and cash equivalents: |  |  |  |  |  |  |
Cash | $ | 241,355 |  |  | $ | — |  |  | $ | — |  |  | $ | 241,355 |
Money market funds | 146,165 |  |  | — |  |  | — |  |  | 146,165 |
Total cash and cash equivalents | $ | 387,520 |  |  | $ | — |  |  | $ | — |  |  | $ | 387,520 |
Short-term investments: |  |  |  |  |  |  |
Commercial paper | $ | 7,489 |  |  | $ | — |  |  | $ | — |  |  | $ | 7,489 |
Corporate securities | 318,946 |  |  | 425 |  |  | (78) |  |  | 319,293 |
U.S. treasury securities | 44,251 |  |  | 39 |  |  | (4) |  |  | 44,286 |
Agency bonds | 10,000 |  |  | 6 |  |  | — |  |  | 10,006 |
Total short-term investments | $ | 380,686 |  |  | $ | 470 |  |  | $ | (82) |  |  | $ | 381,074 |
Long-term investments: |  |  |  |  |  |  |
Corporate securities | $ | 295,103 |  |  | $ | 533 |  |  | $ | (158) |  |  | $ | 295,478 |
Agency bonds | 14,999 |  |  | 6 |  |  | — |  |  | 15,005 |
Total long-term investments | $ | 310,102 |  |  | $ | 539 |  |  | $ | (158) |  |  | $ | 310,483 |
Schedule of Available-for-sale Securities Reconciliation | The following table shows our cash equivalents and investments' adjusted cost and fair value by contractual maturity as of September 30, 2020 (in thousands):
| Adjusted Cost |  | Fair Value
Due in 1 year or less | $ | 1,028,399 |  |  | $ | 1,031,000 |
Due in 1-2 years | 521,269 |  |  | 521,261 |
Investments not due at a single maturity date | 202,522 |  |  | 202,522 |
Total | $ | 1,752,190 |  |  | $ | 1,754,783 |

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