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CASH EQUIVALENTS AND MARKETABLE SECURITIES - (Tables) | 9 Months Ended
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Sep. 30, 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
September 30, 2021 |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 124,592 |  |  | $ | — |  |  | $ | — |  |  | $ | 124,592 |
Total | 124,592 |  |  | — |  |  | — |  |  | 124,592 |
Marketable securities: |  |  |  |  |  |  |
U.S. government-sponsored entity debt securities | 87,159 |  |  | 12 |  |  | (4) |  |  | 87,167 |
Commercial paper securities | 98,046 |  |  | 24 |  |  | (5) |  |  | 98,065 |
Corporate debt securities | 33,697 |  |  | 3 |  |  | (6) |  |  | 33,694 |
Asset-backed securities | 74,350 |  |  | 7 |  |  | (31) |  |  | 74,326 |
Certificate of deposits | 48,828 |  |  | 11 |  |  | (1) |  |  | 48,838 |
Total | 342,080 |  |  | 57 |  |  | (47) |  |  | 342,090 |
Total cash equivalents and marketable securities | $ | 466,672 |  |  | $ | 57 |  |  | $ | (47) |  |  | $ | 466,682 |
December 31, 2020 |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 53,165 |  |  | $ | — |  |  | $ | — |  |  | $ | 53,165 |
Total | 53,165 |  |  | — |  |  | — |  |  | 53,165 |
Marketable securities: |  |  |  |  |  |  |
U.S. government-sponsored entity debt securities | 257,284 |  |  | 19 |  |  | (5) |  |  | 257,298 |
Commercial paper securities | 213,500 |  |  | 41 |  |  | (8) |  |  | 213,533 |
Corporate debt securities | 59,575 |  |  | 16 |  |  | (17) |  |  | 59,574 |
Asset-backed securities | 17,905 |  |  | 10 |  |  | (7) |  |  | 17,908 |
Certificate of deposits | 12,311 |  |  | — |  |  | — |  |  | 12,311 |
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):
| September 30, 2021 |  | December 31, 2020
Maturing in one year or less | $ | 246,460 |  |  | $ | 510,094 |
Maturing after one year through five years | 95,630 |  |  | 50,530 |
Total | $ | 342,090 |  |  | $ | 560,624 |

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