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Cash Equivalents and Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities | The table below summarizes the Company’s cash equivalents and marketable securities (in thousands):
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
December 31, 2020 |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 53,165 |  |  | $ | — |  |  | $ | — |  |  | $ | 53,165 |
Total | 53,165 |  |  | — |  |  | — |  |  | 53,165 |
Marketable securities: |  |  |  |  |  |  |
Commercial paper | 213,500 |  |  | 41 |  |  | (8) |  |  | 213,533 |
Corporate debt securities | 59,575 |  |  | 16 |  |  | (17) |  |  | 59,574 |
Certificates of deposit | 12,311 |  |  | — |  |  | — |  |  | 12,311 |
Asset-backed securities | 17,905 |  |  | 10 |  |  | (7) |  |  | 17,908 |
U.S. government-sponsored entity debt securities | 257,284 |  |  | 19 |  |  | (5) |  |  | 257,298 |
Total | 560,575 |  |  | 86 |  |  | (37) |  |  | 560,624 |
Total cash equivalents and marketable securities | $ | 613,740 |  |  | $ | 86 |  |  | $ | (37) |  |  | $ | 613,789 |
December 31, 2019 |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 30,496 |  |  | $ | — |  |  | $ | — |  |  | $ | 30,496 |
Commercial paper | 2,998 |  |  | 1 |  |  | — |  |  | 2,999 |
Total | 33,494 |  |  | 1 |  |  | — |  |  | 33,495 |
Marketable securities: |  |  |  |  |  |  |
Commercial paper | 155,230 |  |  | 145 |  |  | (7) |  |  | 155,368 |
Corporate debt securities | 94,905 |  |  | 115 |  |  | (3) |  |  | 95,017 |
U.S. government-sponsored entity debt securities | 53,411 |  |  | 91 |  |  | (9) |  |  | 53,493 |
Total | 303,546 |  |  | 351 |  |  | (19) |  |  | 303,878 |
Total cash equivalents and marketable securities | $ | 337,040 |  |  | $ | 352 |  |  | $ | (19) |  |  | $ | 337,373 |
Investments Classified by Contractual Maturity Date | The fair value of marketable securities by contractual maturity were as follows (in thousands):
| December 31,
| 2020 |  | 2019
Maturing in one year or less | $ | 510,094 |  |  | $ | 282,046 |
Maturing after one year through five years | 50,530 |  |  | 21,832 |
Total | $ | 560,624 |  |  | $ | 303,878 |

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