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CASH EQUIVALENTS AND MARKETABLE SECURITIES - Summary of Cash Equivalents and Available-for-Sale Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
ASSETS |  |  |  |
Cash equivalents, Amortized Cost | $ 176,954 | $ 131,329 | $ 259,393 | $ 80,428
Available-for-sale securities, Amortized Cost | 342,080 | 560,575 |  |
Available-for-sale securities, Gross Unrealized Gains | 57 | 86 |  |
Available-for-sale securities, Gross Unrealized (Losses) | (47) | (37) |  |
Available-for-sale securities, Estimated Fair Value | 342,090 | 560,624 |  |
Total cash equivalents and available-for-sale securities, Amortized Cost | 466,672 | 613,740 |  |
Total cash equivalents and available-for-sale securities, Gross Unrealized Gains | 57 | 86 |  |
Total cash equivalents and available-for-sale securities, Gross Unrealized (Losses) | (47) | (37) |  |
Total cash equivalents and available-for-sale securities, Estimated Fair Value | 466,682 | 613,789 |  |
Money market funds |  |  |  |
ASSETS |  |  |  |
Cash equivalents, Amortized Cost | 124,592 | 53,165 |  |
Cash equivalents, Gross Unrealized Gains | 0 | 0 |  |
Cash equivalents, Gross Unrealized (Losses) | 0 | 0 |  |
Cash equivalents, Estimated Fair Value | 124,592 | 53,165 |  |
Cash equivalents |  |  |  |
ASSETS |  |  |  |
Cash equivalents, Amortized Cost | 124,592 | 53,165 |  |
Cash equivalents, Gross Unrealized Gains | 0 | 0 |  |
Cash equivalents, Gross Unrealized (Losses) | 0 | 0 |  |
Cash equivalents, Estimated Fair Value | 124,592 | 53,165 |  |
U.S. government-sponsored entity debt securities |  |  |  |
ASSETS |  |  |  |
Available-for-sale securities, Amortized Cost | 87,159 | 257,284 |  |
Available-for-sale securities, Gross Unrealized Gains | 12 | 19 |  |
Available-for-sale securities, Gross Unrealized (Losses) | (4) | (5) |  |
Available-for-sale securities, Estimated Fair Value | 87,167 | 257,298 |  |
Commercial paper securities |  |  |  |
ASSETS |  |  |  |
Available-for-sale securities, Amortized Cost | 98,046 | 213,500 |  |
Available-for-sale securities, Gross Unrealized Gains | 24 | 41 |  |
Available-for-sale securities, Gross Unrealized (Losses) | (5) | (8) |  |
Available-for-sale securities, Estimated Fair Value | 98,065 | 213,533 |  |
Corporate debt securities |  |  |  |
ASSETS |  |  |  |
Available-for-sale securities, Amortized Cost | 33,697 | 59,575 |  |
Available-for-sale securities, Gross Unrealized Gains | 3 | 16 |  |
Available-for-sale securities, Gross Unrealized (Losses) | (6) | (17) |  |
Available-for-sale securities, Estimated Fair Value | 33,694 | 59,574 |  |
Asset-backed securities |  |  |  |
ASSETS |  |  |  |
Available-for-sale securities, Amortized Cost | 74,350 | 17,905 |  |
Available-for-sale securities, Gross Unrealized Gains | 7 | 10 |  |
Available-for-sale securities, Gross Unrealized (Losses) | (31) | (7) |  |
Available-for-sale securities, Estimated Fair Value | 74,326 | 17,908 |  |
Certificates of deposit |  |  |  |
ASSETS |  |  |  |
Available-for-sale securities, Amortized Cost | 48,828 | 12,311 |  |
Available-for-sale securities, Gross Unrealized Gains | 11 | 0 |  |
Available-for-sale securities, Gross Unrealized (Losses) | (1) | 0 |  |
Available-for-sale securities, Estimated Fair Value | $ 48,838 | $ 12,311 |  |

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