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Summary of Company Cash, Cash Equivalents and Short-term Investments (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, Amortized cost	$ 1,930,484
Cash and cash equivalents, Gross unrealized losses	(9)
Cash and cash equivalents	868,565	$ 2,115,869	$ 1,697,275
Cash, cash equivalents and investments, Amortized cost	868,574	2,115,869
Cash, cash equivalents and investments, Gross unrealized gains	7
Cash, cash equivalents and investments, Gross unrealized losses	(2,472)
Cash, cash equivalents and investments, Fair value	1,928,019	2,115,869
Available for sale debt securities current, Amortized cost	1,061,910
Available for sale debt securities current, Gross unrealized gains	7
Available for sale debt securities current, Gross unrealized losses	(2,463)
Available for sale debt securities current, Fair value	1,059,454	0
Cash and Money Market Funds [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, Amortized cost	825,628	2,115,869
Cash and cash equivalents	825,628	2,115,869
Commercial Paper [Member]
Cash and Cash Equivalents [Line Items]
Available for sale debt securities, Fair value	226,674
Cash and cash equivalents, Amortized cost	226,674
Government and Government Agency Bonds [Member]
Cash and Cash Equivalents [Line Items]
Available for sale debt securities, Gross unrealized gains	5
Available for sale debt securities, Gross unrealized losses	(1,560)
Available for sale debt securities, Fair value	639,664
Cash and cash equivalents, Amortized cost	641,219
Cash, cash equivalents and investments, Fair value		$ 2,115,869
Corporate Bond [Member]
Cash and Cash Equivalents [Line Items]
Available for sale debt securities, Gross unrealized gains	2
Available for sale debt securities, Gross unrealized losses	(912)
Available for sale debt securities, Fair value	199,103
Cash and cash equivalents, Amortized cost	200,013
Certificates of Deposit [Member]
Cash and Cash Equivalents [Line Items]
Available for sale debt securities, Fair value	36,950
Cash and cash equivalents, Amortized cost	$ 36,950