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CASH EQUIVALENTS AND MARKETABLE SECURITIES - Summary of Cash Equivalents and Available-for-Sale Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
ASSETS |  |  |  |
Cash equivalents, Amortized Cost | $ 259,393 | $ 80,428 | $ 114,291 | $ 140,418
Available-for-sale securities, Amortized Cost | 434,850 | 303,546 |  |
Available-for-sale securities, Gross Unrealized Gains | 404 | 351 |  |
Available-for-sale securities, Gross Unrealized (Losses) | (59) | (19) |  |
Available-for-sale securities, Estimated Fair Value | 435,195 | 303,878 |  |
Total cash equivalents and available-for-sale securities, Amortized Cost | 613,356 | 337,040 |  |
Total cash equivalents and available-for-sale securities, Gross Unrealized Gains | 405 | 352 |  |
Total cash equivalents and available-for-sale securities, Gross Unrealized (Losses) | (59) | (19) |  |
Total cash equivalents and available-for-sale securities, Estimated Fair Value | 613,702 | 337,373 |  |
Money market funds |  |  |  |
ASSETS |  |  |  |
Cash equivalents, Amortized Cost | 172,508 | 30,496 |  |
Cash equivalents, Gross Unrealized Gains | 0 | 0 |  |
Cash equivalents, Gross Unrealized (Losses) | 0 | 0 |  |
Cash equivalents, Estimated Fair Value | 172,508 | 30,496 |  |
Commercial paper securities |  |  |  |
ASSETS |  |  |  |
Cash equivalents, Amortized Cost | 5,998 | 2,998 |  |
Cash equivalents, Gross Unrealized Gains | 1 | 1 |  |
Cash equivalents, Gross Unrealized (Losses) | 0 | 0 |  |
Cash equivalents, Estimated Fair Value | 5,999 | 2,999 |  |
Available-for-sale securities, Amortized Cost | 238,248 | 155,230 |  |
Available-for-sale securities, Gross Unrealized Gains | 169 | 145 |  |
Available-for-sale securities, Gross Unrealized (Losses) | (19) | (7) |  |
Available-for-sale securities, Estimated Fair Value | 238,398 | 155,368 |  |
Corporate debt securities |  |  |  |
ASSETS |  |  |  |
Available-for-sale securities, Amortized Cost | 122,364 | 94,905 |  |
Available-for-sale securities, Gross Unrealized Gains | 156 | 115 |  |
Available-for-sale securities, Gross Unrealized (Losses) | (36) | (3) |  |
Available-for-sale securities, Estimated Fair Value | 122,484 | 95,017 |  |
Asset-backed securities |  |  |  |
ASSETS |  |  |  |
Available-for-sale securities, Amortized Cost | 13,067 |  |  |
Available-for-sale securities, Gross Unrealized Gains | 3 |  |  |
Available-for-sale securities, Gross Unrealized (Losses) | (4) |  |  |
Available-for-sale securities, Estimated Fair Value | 13,066 |  |  |
Cash equivalents |  |  |  |
ASSETS |  |  |  |
Cash equivalents, Amortized Cost | 178,506 | 33,494 |  |
Cash equivalents, Gross Unrealized Gains | 1 | 1 |  |
Cash equivalents, Gross Unrealized (Losses) | 0 | 0 |  |
Cash equivalents, Estimated Fair Value | 178,507 | 33,495 |  |
U.S. government-sponsored entity debt securities |  |  |  |
ASSETS |  |  |  |
Available-for-sale securities, Amortized Cost | 61,171 | 53,411 |  |
Available-for-sale securities, Gross Unrealized Gains | 76 | 91 |  |
Available-for-sale securities, Gross Unrealized (Losses) | 0 | (9) |  |
Available-for-sale securities, Estimated Fair Value | $ 61,247 | $ 53,493 |  |

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