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CASH EQUIVALENTS AND MARKETABLE SECURITIES - Summary of Cash Equivalents and Available-for-Sale Securities (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
ASSETS |  |  |  |
Cash equivalents, Amortized Cost | $ 122,975 | $ 131,329 | $ 85,749 | $ 80,428
Available-for-sale securities, Amortized Cost | 506,447 | 560,575 |  |
Available-for-sale securities, Gross Unrealized Gains | 124 | 86 |  |
Available-for-sale securities, Gross Unrealized (Losses) | (31) | (37) |  |
Available-for-sale securities, Estimated Fair Value | 506,540 | 560,624 |  |
Total cash equivalents and available-for-sale securities, Amortized Cost | 554,082 | 613,740 |  |
Total cash equivalents and available-for-sale securities, Gross Unrealized Gains | 124 | 86 |  |
Total cash equivalents and available-for-sale securities, Gross Unrealized (Losses) | (31) | (37) |  |
Total cash equivalents and available-for-sale securities, Estimated Fair Value | 554,175 | 613,789 |  |
Money market funds |  |  |  |
ASSETS |  |  |  |
Cash equivalents, Amortized Cost | 47,635 | 53,165 |  |
Cash equivalents, Gross Unrealized Gains | 0 | 0 |  |
Cash equivalents, Gross Unrealized (Losses) | 0 | 0 |  |
Cash equivalents, Estimated Fair Value | 47,635 | 53,165 |  |
Commercial paper securities |  |  |  |
ASSETS |  |  |  |
Available-for-sale securities, Amortized Cost | 177,101 | 213,500 |  |
Available-for-sale securities, Gross Unrealized Gains | 53 | 41 |  |
Available-for-sale securities, Gross Unrealized (Losses) | 0 | (8) |  |
Available-for-sale securities, Estimated Fair Value | 177,154 | 213,533 |  |
Corporate debt securities |  |  |  |
ASSETS |  |  |  |
Available-for-sale securities, Amortized Cost | 39,031 | 59,575 |  |
Available-for-sale securities, Gross Unrealized Gains | 5 | 16 |  |
Available-for-sale securities, Gross Unrealized (Losses) | (14) | (17) |  |
Available-for-sale securities, Estimated Fair Value | 39,022 | 59,574 |  |
Certificates of deposit |  |  |  |
ASSETS |  |  |  |
Available-for-sale securities, Amortized Cost | 11,495 | 12,311 |  |
Available-for-sale securities, Gross Unrealized Gains | 0 | 0 |  |
Available-for-sale securities, Gross Unrealized (Losses) | (1) | 0 |  |
Available-for-sale securities, Estimated Fair Value | 11,494 | 12,311 |  |
Asset-backed securities |  |  |  |
ASSETS |  |  |  |
Available-for-sale securities, Amortized Cost | 36,419 | 17,905 |  |
Available-for-sale securities, Gross Unrealized Gains | 7 | 10 |  |
Available-for-sale securities, Gross Unrealized (Losses) | (16) | (7) |  |
Available-for-sale securities, Estimated Fair Value | 36,410 | 17,908 |  |
Cash equivalents |  |  |  |
ASSETS |  |  |  |
Cash equivalents, Amortized Cost | 47,635 | 53,165 |  |
Cash equivalents, Gross Unrealized Gains | 0 | 0 |  |
Cash equivalents, Gross Unrealized (Losses) | 0 | 0 |  |
Cash equivalents, Estimated Fair Value | 47,635 | 53,165 |  |
U.S. government-sponsored entity debt securities |  |  |  |
ASSETS |  |  |  |
Available-for-sale securities, Amortized Cost | 242,401 | 257,284 |  |
Available-for-sale securities, Gross Unrealized Gains | 59 | 19 |  |
Available-for-sale securities, Gross Unrealized (Losses) | 0 | (5) |  |
Available-for-sale securities, Estimated Fair Value | $ 242,460 | $ 257,298 |  |

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