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CASH EQUIVALENTS AND MARKETABLE SECURITIES - (Tables) | 6 Months Ended
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Jun. 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
June 30, 2021 |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 57,371 |  |  | $ | — |  |  | $ | — |  |  | $ | 57,371 |
Total | 57,371 |  |  | — |  |  | — |  |  | 57,371 |
Marketable securities: |  |  |  |  |  |  |
U.S. government-sponsored entity debt securities | 160,310 |  |  | 26 |  |  | — |  |  | 160,336 |
Commercial paper securities | 143,435 |  |  | 33 |  |  | (3) |  |  | 143,465 |
Corporate debt securities | 36,942 |  |  | 6 |  |  | (10) |  |  | 36,938 |
Asset-backed securities | 45,743 |  |  | 12 |  |  | (13) |  |  | 45,742 |
Certificate of deposits | 22,492 |  |  | 7 |  |  | — |  |  | 22,499 |
Total | 408,922 |  |  | 84 |  |  | (26) |  |  | 408,980 |
Total cash equivalents and marketable securities | $ | 466,293 |  |  | $ | 84 |  |  | $ | (26) |  |  | $ | 466,351 |
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):
| June 30, 2021 |  | December 31, 2020
Maturing in one year or less | $ | 359,775 |  |  | $ | 510,094 |
Maturing after one year through five years | 49,205 |  |  | 50,530 |
Total | $ | 408,980 |  |  | $ | 560,624 |

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