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Marketable Securities - Summary of Cash Equivalents and Available-for-Sale Securities (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Schedule Of Available For Sale Securities [Line Items] |  |
Cash equivalents, Amortized Cost | $ 80,968 | $ 140,418
Available-for-sale securities, Amortized Cost | 270,034 | 259,974
Available-for-sale securities, Gross Unrealized Gains | 19 |
Available-for-sale securities, Gross Unrealized (Losses) | (25) | (259)
Available-for-sale securities, Estimated Fair Value | 270,028 | 259,715
Total cash equivalents and available-for-sale securities, Amortized Cost | 290,257 | 363,265
Total cash equivalents and available-for-sale securities, Gross Unrealized Gains | 19 |
Total cash equivalents and available-for-sale securities, Gross Unrealized (Losses) | (25) | (259)
Total cash equivalents and available-for-sale securities, Estimated Fair Value | 290,251 | 363,006
Money market funds [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cash equivalents, Amortized Cost | 15,233 | 103,291
Cash equivalents, Estimated Fair Value | 15,233 | 103,291
Commercial paper securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cash equivalents, Amortized Cost | 4,990 |
Cash equivalents, Estimated Fair Value | 4,990 |
Available-for-sale securities, Amortized Cost | 180,380 | 177,353
Available-for-sale securities, Gross Unrealized Gains | 19 |
Available-for-sale securities, Gross Unrealized (Losses) |  | (129)
Available-for-sale securities, Estimated Fair Value | 180,399 | 177,224
Cash equivalents [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cash equivalents, Amortized Cost | 20,223 | 103,291
Cash equivalents, Estimated Fair Value | 20,223 | 103,291
Corporate debt securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale securities, Amortized Cost | 70,973 | 63,981
Available-for-sale securities, Gross Unrealized (Losses) | (25) | (111)
Available-for-sale securities, Estimated Fair Value | 70,948 | 63,870
U.S. government sponsored entity debt securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale securities, Amortized Cost | 18,681 | 18,640
Available-for-sale securities, Gross Unrealized (Losses) |  | (19)
Available-for-sale securities, Estimated Fair Value | $ 18,681 | $ 18,621

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