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CASH EQUIVALENTS AND MARKETABLE SECURITIES - (Tables) | 9 Months Ended
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Sep. 30, 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
September 30, 2020 |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |
Money market funds |  | $ | 172,508 |  |  | $ | — |  |  | $ | — |  |  | $ | 172,508 |
Commercial paper securities |  | 5,998 |  |  | 1 |  |  | — |  |  | 5,999 |
Total |  | 178,506 |  |  | 1 |  |  | — |  |  | 178,507 |
Marketable securities: |  |  |  |  |  |  |  |
Commercial paper securities |  | 238,248 |  |  | 169 |  |  | (19) |  |  | 238,398 |
Corporate debt securities |  | 122,364 |  |  | 156 |  |  | (36) |  |  | 122,484 |
Asset-backed securities |  | 13,067 |  |  | 3 |  |  | (4) |  |  | 13,066 |
U.S. government-sponsored entity debt securities |  | 61,171 |  |  | 76 |  |  | — |  |  | 61,247 |
Total |  | 434,850 |  |  | 404 |  |  | (59) |  |  | 435,195 |
Total cash equivalents and marketable securities |  | $ | 613,356 |  |  | $ | 405 |  |  | $ | (59) |  |  | $ | 613,702 |
December 31, 2019 |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |
Money market funds |  | $ | 30,496 |  |  | $ | — |  |  | $ | — |  |  | $ | 30,496 |
Commercial paper securities |  | 2,998 |  |  | 1 |  |  | — |  |  | 2,999 |
Total |  | 33,494 |  |  | 1 |  |  | — |  |  | 33,495 |
Marketable securities: |  |  |  |  |  |  |  |
Commercial paper securities |  | 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 |
Fair value of investments available-for-sale | The fair value of investments available-for-sale by contractual maturity were as follows (in thousands):
|  | September 30, 2020 |  | December 31, 2019
Maturing in one year or less |  | $ | 389,434 |  |  | $ | 282,046 |
Maturing after one year through five years |  | 45,761 |  |  | 21,832 |
Total |  | $ | 435,195 |  |  | $ | 303,878 |

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