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CASH EQUIVALENTS AND MARKETABLE SECURITIES - Summary of Cash Equivalents and Available-for-Sale Securities (Detail) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
ASSETS |  |  |  |
Cash equivalents, Amortized Cost | $ 85,749 | $ 80,428 | $ 80,968 | $ 140,418
Available-for-sale securities, Amortized Cost | 276,794 | 303,546 |  |
Available-for-sale securities, Gross Unrealized Gains | 710 | 351 |  |
Available-for-sale securities, Gross Unrealized (Losses) | (123) | (19) |  |
Available-for-sale securities, Estimated Fair Value | 277,381 | 303,878 |  |
Total cash equivalents and available-for-sale securities, Amortized Cost | 336,403 | 337,040 |  |
Total cash equivalents and available-for-sale securities, Gross Unrealized Gains | 710 | 352 |  |
Total cash equivalents and available-for-sale securities, Gross Unrealized (Losses) | (123) | (19) |  |
Total cash equivalents and available-for-sale securities, Estimated Fair Value | 336,990 | 337,373 |  |
Money market funds |  |  |  |
ASSETS |  |  |  |
Cash equivalents, Amortized Cost | 59,609 | 30,496 |  |
Cash equivalents, Gross Unrealized Gains | 0 | 0 |  |
Cash equivalents, Gross Unrealized (Losses) | 0 | 0 |  |
Cash equivalents, Estimated Fair Value | 59,609 | 30,496 |  |
Commercial paper securities |  |  |  |
ASSETS |  |  |  |
Cash equivalents, Amortized Cost |  | 2,998 |  |
Cash equivalents, Gross Unrealized Gains | 0 | 1 |  |
Cash equivalents, Gross Unrealized (Losses) | 0 | 0 |  |
Cash equivalents, Estimated Fair Value |  | 2,999 |  |
Available-for-sale securities, Amortized Cost | 129,827 | 155,230 |  |
Available-for-sale securities, Gross Unrealized Gains | 352 | 145 |  |
Available-for-sale securities, Gross Unrealized (Losses) | 0 | (7) |  |
Available-for-sale securities, Estimated Fair Value | 130,179 | 155,368 |  |
Cash equivalents |  |  |  |
ASSETS |  |  |  |
Cash equivalents, Amortized Cost | 59,609 | 33,494 |  |
Cash equivalents, Gross Unrealized Gains |  | 1 |  |
Cash equivalents, Gross Unrealized (Losses) |  | 0 |  |
Cash equivalents, Estimated Fair Value | 59,609 | 33,495 |  |
Corporate debt securities |  |  |  |
ASSETS |  |  |  |
Available-for-sale securities, Amortized Cost | 95,534 | 94,905 |  |
Available-for-sale securities, Gross Unrealized Gains | 107 | 115 |  |
Available-for-sale securities, Gross Unrealized (Losses) | (123) | (3) |  |
Available-for-sale securities, Estimated Fair Value | 95,518 | 95,017 |  |
U.S. government-sponsored entity debt securities |  |  |  |
ASSETS |  |  |  |
Available-for-sale securities, Amortized Cost | 51,433 | 53,411 |  |
Available-for-sale securities, Gross Unrealized Gains | 251 | 91 |  |
Available-for-sale securities, Gross Unrealized (Losses) | 0 | (9) |  |
Available-for-sale securities, Estimated Fair Value | $ 51,684 | $ 53,493 |  |

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