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Marketable Securities - Summary of Cash Equivalents and Marketable Securities Recorded at Fair Value (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Marketable Securities [Line Items] |  |
Cash equivalents, amortized cost | $ 517,383 | $ 773,560
Cash equivalents, gross unrealized gains |  | 1
Cash equivalents, gross unrealized losses | (1) | (24)
Cash equivalents, fair value | 517,382 | 773,537
Marketable securities, amortized cost | 1,461,200 | 521,820
Marketable securities, gross unrealized gains | 16 | 51
Marketable securities, gross unrealized losses | (5,118) | (158)
Marketable securities, fair value | 1,456,098 | 521,713
Cash equivalents and marketable securities, amortized cost | 1,978,583 | 1,295,380
Cash equivalents and marketable securities, gross unrealized gains | 16 | 52
Cash equivalents and marketable securities, gross unrealized losses | (5,119) | (182)
Cash equivalents and marketable securities, fair value | 1,973,480 | 1,295,250
Money Market Funds [Member] |  |
Marketable Securities [Line Items] |  |
Cash equivalents, amortized cost | 507,386 | 742,958
Cash equivalents, fair value | 507,386 | 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 | 45,164 | 25,162
Marketable securities, fair value | 45,164 | 25,162
Commercial Paper [Member] |  |
Marketable Securities [Line Items] |  |
Cash equivalents, amortized cost | 9,997 | 15,549
Cash equivalents, gross unrealized losses | (1) |
Cash equivalents, fair value | 9,996 | 15,549
Marketable securities, amortized cost | 212,805 | 90,375
Marketable securities, gross unrealized losses | (86) |
Marketable securities, fair value | 212,719 | 90,375
US Treasury Securities [Member] |  |
Marketable Securities [Line Items] |  |
Marketable securities, amortized cost | 16,238 | 47,976
Marketable securities, gross unrealized gains | 6 | 3
Marketable securities, gross unrealized losses | (52) |
Marketable securities, fair value | 16,192 | 47,979
Corporate Debt Securities [Member] |  |
Marketable Securities [Line Items] |  |
Cash equivalents, amortized cost |  | 2,526
Cash equivalents, gross unrealized gains |  | 1
Cash equivalents, gross unrealized losses |  | (24)
Cash equivalents, fair value |  | 2,503
Marketable securities, amortized cost | 1,173,659 | 324,569
Marketable securities, gross unrealized gains | 10 | 43
Marketable securities, gross unrealized losses | (4,903) | (156)
Marketable securities, fair value | 1,168,766 | 324,456
Government-sponsored Enterprise Securities [Member] |  |
Marketable Securities [Line Items] |  |
Marketable securities, amortized cost | 13,334 | 33,738
Marketable securities, gross unrealized gains |  | 5
Marketable securities, gross unrealized losses | (77) | (2)
Marketable securities, fair value | $ 13,257 | $ 33,741

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