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Marketable Securities - Summary of Cash Equivalents and Available-for-Sale Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Debt Securities, Available-for-sale [Line Items] |  |
Cash and cash equivalents, at carrying value, total | $ 80,428 | $ 140,418
Available-for-sale securities, amortized cost | 303,546 | 259,974
Available-for-sale securities, gross unrealized gains | 351 | 0
Available-for-sale securities, gross unrealized (Losses) | (19) | (259)
Available-for-sale securities, estimated fair value | 303,878 | 259,715
Total cash equivalents and available-for-sale securities, amortized cost | 337,040 | 363,265
Total cash equivalents and available-for-sale securities, gross unrealized gains | 352 | 0
Total cash equivalents and available-for-sale securities, gross unrealized (losses) | (19) | (259)
Total cash equivalents and available-for-sale securities, estimated fair value | 337,373 | 363,006
Money market funds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash and cash equivalents, at carrying value, total | 30,496 | 103,291
Cash equivalents, gross unrealized gains | 0 | 0
Cash and cash equivalents accumulated gross unrealized loss before tax | 0 | 0
Cash equivalents, estimated fair value | 30,496 | 103,291
Commercial paper securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash and cash equivalents, at carrying value, total | 2,998 |
Cash equivalents, gross unrealized gains | 1 |
Cash and cash equivalents accumulated gross unrealized loss before tax | 0 |
Cash equivalents, estimated fair value | 2,999 |
Available-for-sale securities, amortized cost | 155,230 | 177,353
Available-for-sale securities, gross unrealized gains | 145 | 0
Available-for-sale securities, gross unrealized (Losses) | (7) | (129)
Available-for-sale securities, estimated fair value | 155,368 | 177,224
Cash equivalents: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cash and cash equivalents, at carrying value, total | 33,494 | 103,291
Cash equivalents, gross unrealized gains | 1 | 0
Cash and cash equivalents accumulated gross unrealized loss before tax | 0 | 0
Cash equivalents, estimated fair value | 33,495 | 103,291
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale securities, amortized cost | 94,905 | 63,981
Available-for-sale securities, gross unrealized gains | 115 | 0
Available-for-sale securities, gross unrealized (Losses) | (3) | (111)
Available-for-sale securities, estimated fair value | 95,017 | 63,870
U.S. government-sponsored entity debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale securities, amortized cost | 53,411 | 18,640
Available-for-sale securities, gross unrealized gains | 91 | 0
Available-for-sale securities, gross unrealized (Losses) | (9) | (19)
Available-for-sale securities, estimated fair value | $ 53,493 | $ 18,621

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