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CASH EQUIVALENTS AND MARKETABLE SECURITIES - (Tables) | 3 Months Ended
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Mar. 31, 2021
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
March 31, 2021 |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |
Money market funds |  | $ | 47,635 |  |  | $ | — |  |  | $ | — |  |  | $ | 47,635 |
Total |  | 47,635 |  |  | — |  |  | — |  |  | 47,635 |
Marketable securities: |  |  |  |  |  |  |  |
Commercial paper securities |  | 177,101 |  |  | 53 |  |  | — |  |  | 177,154 |
Corporate debt securities |  | 39,031 |  |  | 5 |  |  | (14) |  |  | 39,022 |
Certificate of deposits |  | 11,495 |  |  | — |  |  | (1) |  |  | 11,494 |
Asset-backed securities |  | 36,419 |  |  | 7 |  |  | (16) |  |  | 36,410 |
U.S. government-sponsored entity debt securities |  | 242,401 |  |  | 59 |  |  | — |  |  | 242,460 |
Total |  | 506,447 |  |  | 124 |  |  | (31) |  |  | 506,540 |
Total cash equivalents and marketable securities |  | $ | 554,082 |  |  | $ | 124 |  |  | $ | (31) |  |  | $ | 554,175 |
December 31, 2020 |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |
Money market funds |  | $ | 53,165 |  |  | $ | — |  |  | $ | — |  |  | $ | 53,165 |
Total |  | 53,165 |  |  | — |  |  | — |  |  | 53,165 |
Marketable securities: |  |  |  |  |  |  |  |
Commercial paper securities |  | 213,500 |  |  | 41 |  |  | (8) |  |  | 213,533 |
Corporate debt securities |  | 59,575 |  |  | 16 |  |  | (17) |  |  | 59,574 |
Certificate of deposits |  | 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 |
Fair value of investments available-for-sale | The fair value of marketable securities by contractual maturity were as follows (in thousands):
|  | March 31, 2021 |  | December 31, 2020
Maturing in one year or less |  | $ | 464,109 |  |  | $ | 510,094 |
Maturing after one year through five years |  | 42,431 |  |  | 50,530 |
Total |  | $ | 506,540 |  |  | $ | 560,624 |

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