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Marketable Securities - Summary of Cash Equivalents and Marketable Securities Recorded at Fair Value (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Marketable Securities [Line Items] |  |
Cash equivalents, amortized cost | $ 631,890 | $ 773,560
Cash equivalents, gross unrealized gains | 1 | 1
Cash equivalents, gross unrealized losses | (2) | (24)
Cash equivalents, fair value | 631,889 | 773,537
Marketable securities, amortized cost | 680,657 | 521,820
Marketable securities, gross unrealized gains | 39 | 51
Marketable securities, gross unrealized losses | (552) | (158)
Marketable securities, fair value | 680,144 | 521,713
Cash equivalents and marketable securities, amortized cost | 1,312,547 | 1,295,380
Cash equivalents and marketable securities, gross unrealized gains | 40 | 52
Cash equivalents and marketable securities, gross unrealized losses | (554) | (182)
Cash equivalents and marketable securities, fair value | 1,312,033 | 1,295,250
Money Market Funds [Member] |  |
Marketable Securities [Line Items] |  |
Cash equivalents, amortized cost | 629,357 | 742,958
Cash equivalents, fair value | 629,357 | 742,958
Certificates of Deposit [Member] |  |
Marketable Securities [Line Items] |  |
Cash equivalents, amortized cost |  | 12,527
Cash equivalents, fair value |  | 12,527
Marketable securities, amortized cost | 54,273 | 25,162
Marketable securities, fair value | 54,273 | 25,162
Commercial Paper [Member] |  |
Marketable Securities [Line Items] |  |
Cash equivalents, amortized cost |  | 15,549
Cash equivalents, fair value |  | 15,549
Marketable securities, amortized cost | 87,120 | 90,375
Marketable securities, gross unrealized gains | 2 |
Marketable securities, fair value | 87,122 | 90,375
US Treasury Securities [Member] |  |
Marketable Securities [Line Items] |  |
Marketable securities, amortized cost |  | 47,976
Marketable securities, gross unrealized gains |  | 3
Marketable securities, fair value |  | 47,979
Corporate Debt Securities [Member] |  |
Marketable Securities [Line Items] |  |
Cash equivalents, amortized cost | 2,533 | 2,526
Cash equivalents, gross unrealized gains | 1 | 1
Cash equivalents, gross unrealized losses | (2) | (24)
Cash equivalents, fair value | 2,532 | 2,503
Marketable securities, amortized cost | 536,144 | 324,569
Marketable securities, gross unrealized gains | 37 | 43
Marketable securities, gross unrealized losses | (551) | (156)
Marketable securities, fair value | 535,630 | 324,456
Government-sponsored Enterprise Securities [Member] |  |
Marketable Securities [Line Items] |  |
Marketable securities, amortized cost | 3,120 | 33,738
Marketable securities, gross unrealized gains |  | 5
Marketable securities, gross unrealized losses | (1) | (2)
Marketable securities, fair value | $ 3,119 | $ 33,741

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