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Marketable Securities - Summary of Cash Equivalents and Marketable Securities Recorded at Fair Value (Detail) $ in Thousands | Sep. 30, 2020 USD ($)
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Marketable Securities [Line Items] |
Cash equivalents, amortized cost | $ 915,704
Cash equivalents, gross unrealized losses | (1)
Cash equivalents, fair value | 915,703
Marketable securities, amortized cost | 324,716
Marketable securities, gross unrealized gains | 11
Marketable securities, gross unrealized losses | (154)
Marketable securities, fair value | 324,573
Cash equivalents and marketable securities, amortized cost | 1,240,420
Cash equivalents and marketable securities, gross unrealized gains | 11
Cash equivalents and marketable securities, gross unrealized losses | (155)
Cash equivalents and marketable securities, fair value | 1,240,276
Money Market Funds [Member] |
Marketable Securities [Line Items] |
Cash equivalents, amortized cost | 896,690
Cash equivalents, fair value | 896,690
Certificates of Deposit [Member] |
Marketable Securities [Line Items] |
Cash equivalents, amortized cost | 4,012
Cash equivalents, fair value | 4,012
Marketable securities, amortized cost | 9,153
Marketable securities, fair value | 9,153
Commercial Paper [Member] |
Marketable Securities [Line Items] |
Cash equivalents, amortized cost | 8,497
Cash equivalents, fair value | 8,497
Marketable securities, amortized cost | 86,097
Marketable securities, fair value | 86,097
US Treasury Securities [Member] |
Marketable Securities [Line Items] |
Marketable securities, amortized cost | 39,978
Marketable securities, gross unrealized gains | 2
Marketable securities, fair value | 39,980
Corporate Debt Securities [Member] |
Marketable Securities [Line Items] |
Cash equivalents, amortized cost | 6,505
Cash equivalents, gross unrealized losses | (1)
Cash equivalents, fair value | 6,504
Marketable securities, amortized cost | 182,716
Marketable securities, gross unrealized gains | 9
Marketable securities, gross unrealized losses | (154)
Marketable securities, fair value | 182,571
Government-sponsored Enterprise Securities [Member] |
Marketable Securities [Line Items] |
Marketable securities, amortized cost | 6,772
Marketable securities, fair value | $ 6,772

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