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CASH EQUIVALENTS AND MARKETABLE SECURITIES - Summary of Cash Equivalents and Available-for-Sale Securities (Detail) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
ASSETS |  |  |  |
Cash equivalents, Amortized Cost | $ 120,257 | $ 178,872 | $ 122,975 | $ 131,329
Available-for-sale securities, Amortized Cost | 281,430 | 286,138 |  |
Available-for-sale securities, Gross Unrealized Gains | 0 | 11 |  |
Available-for-sale securities, Gross Unrealized (Losses) | (1,376) | (304) |  |
Available-for-sale securities, Estimated Fair Value | 280,054 | 285,845 |  |
Total cash equivalents and available-for-sale securities, Amortized Cost | 346,266 | 406,057 |  |
Total cash equivalents and available-for-sale securities, Gross Unrealized Gains | 0 | 11 |  |
Total cash equivalents and available-for-sale securities, Gross Unrealized (Losses) | (1,377) | (304) |  |
Total cash equivalents and available-for-sale securities, Estimated Fair Value | 344,889 | 405,764 |  |
Money market funds |  |  |  |
ASSETS |  |  |  |
Cash equivalents, Amortized Cost | 49,827 | 119,919 |  |
Cash equivalents, Gross Unrealized Gains | 0 | 0 |  |
Cash equivalents, Gross Unrealized (Losses) | 0 | 0 |  |
Cash equivalents, Estimated Fair Value | 49,827 | 119,919 |  |
Cash equivalents |  |  |  |
ASSETS |  |  |  |
Cash equivalents, Amortized Cost | 64,836 | 119,919 |  |
Cash equivalents, Gross Unrealized Gains | 0 | 0 |  |
Cash equivalents, Gross Unrealized (Losses) | (1) | 0 |  |
Cash equivalents, Estimated Fair Value | 64,835 | 119,919 |  |
U.S. government-sponsored entity debt securities |  |  |  |
ASSETS |  |  |  |
Cash equivalents, Amortized Cost | 15,009 |  |  |
Cash equivalents, Gross Unrealized Gains |  |  |  |
Cash equivalents, Gross Unrealized (Losses) | (1) |  |  |
Cash equivalents, Estimated Fair Value | 15,008 |  |  |
Available-for-sale securities, Amortized Cost | 24,788 | 30,700 |  |
Available-for-sale securities, Gross Unrealized Gains | 0 | 1 |  |
Available-for-sale securities, Gross Unrealized (Losses) | (347) | (87) |  |
Available-for-sale securities, Estimated Fair Value | 24,441 | 30,614 |  |
Commercial paper securities |  |  |  |
ASSETS |  |  |  |
Available-for-sale securities, Amortized Cost | 117,709 | 105,792 |  |
Available-for-sale securities, Gross Unrealized Gains | 0 | 7 |  |
Available-for-sale securities, Gross Unrealized (Losses) | (384) | (42) |  |
Available-for-sale securities, Estimated Fair Value | 117,325 | 105,757 |  |
Corporate debt securities |  |  |  |
ASSETS |  |  |  |
Available-for-sale securities, Amortized Cost | 17,522 | 33,723 |  |
Available-for-sale securities, Gross Unrealized Gains | 0 | 1 |  |
Available-for-sale securities, Gross Unrealized (Losses) | (149) | (42) |  |
Available-for-sale securities, Estimated Fair Value | 17,373 | 33,682 |  |
Asset-backed securities |  |  |  |
ASSETS |  |  |  |
Available-for-sale securities, Amortized Cost | 67,890 | 70,807 |  |
Available-for-sale securities, Gross Unrealized Gains | 0 | 1 |  |
Available-for-sale securities, Gross Unrealized (Losses) | (375) | (107) |  |
Available-for-sale securities, Estimated Fair Value | 67,515 | 70,701 |  |
U.S. treasury bills |  |  |  |
ASSETS |  |  |  |
Available-for-sale securities, Amortized Cost | 2,995 |  |  |
Available-for-sale securities, Gross Unrealized Gains | 0 |  |  |
Available-for-sale securities, Gross Unrealized (Losses) | 0 |  |  |
Available-for-sale securities, Estimated Fair Value | 2,995 |  |  |
Certificates of deposit |  |  |  |
ASSETS |  |  |  |
Available-for-sale securities, Amortized Cost | 50,526 | 45,116 |  |
Available-for-sale securities, Gross Unrealized Gains | 0 | 1 |  |
Available-for-sale securities, Gross Unrealized (Losses) | (121) | (26) |  |
Available-for-sale securities, Estimated Fair Value | $ 50,405 | $ 45,091 |  |

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