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Marketable Securities - Summary of Cash Equivalents and Available-for-Sale Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Schedule Of Available For Sale Securities [Line Items] |  |
Cash equivalents, Amortized Cost | $ 140,418 | $ 49,826
Available-for-sale securities, Amortized Cost | 259,974 | 194,749
Available-for-sale securities, Gross Unrealized (Losses) | (259) | (255)
Available-for-sale securities, Estimated Fair Value | 259,715 | 194,494
Total cash equivalents and available-for-sale securities, Amortized Cost | 363,265 | 223,634
Total cash equivalents and available-for-sale securities, Gross Unrealized (Losses) | (259) | (255)
Total cash equivalents and available-for-sale securities, Estimated Fair Value | 363,006 | 223,379
Money market funds [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cash equivalents, Amortized Cost | 103,291 | 24,290
Cash equivalents, Estimated Fair Value | 103,291 | 24,290
Commercial paper securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cash equivalents, Amortized Cost |  | 4,595
Cash equivalents, Estimated Fair Value |  | 4,595
Available-for-sale securities, Amortized Cost | 177,353 | 110,365
Available-for-sale securities, Gross Unrealized (Losses) | (129) | (118)
Available-for-sale securities, Estimated Fair Value | 177,224 | 110,247
Cash equivalents [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cash equivalents, Amortized Cost | 103,291 | 28,885
Cash equivalents, Estimated Fair Value | 103,291 | 28,885
Corporate debt securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale securities, Amortized Cost | 63,981 | 75,886
Available-for-sale securities, Gross Unrealized (Losses) | (111) | (131)
Available-for-sale securities, Estimated Fair Value | 63,870 | 75,755
U.S. government sponsored entity debt securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available-for-sale securities, Amortized Cost | 18,640 | 8,498
Available-for-sale securities, Gross Unrealized (Losses) | (19) | (6)
Available-for-sale securities, Estimated Fair Value | $ 18,621 | $ 8,492

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