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Summary of Company Cash, Cash Equivalents and Short-term Investments (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, Amortized cost	$ 2,013,711
Cash and cash equivalents, Gross unrealized gains	2
Cash and cash equivalents, Gross unrealized losses	(16)
Cash and cash equivalents	1,233,877	$ 2,115,869	$ 1,481,836
Cash, cash equivalents and investments, Amortized cost	1,233,891	2,115,869
Cash, cash equivalents and investments, Gross unrealized gains	34
Cash, cash equivalents and investments, Gross unrealized losses	(320)
Cash, cash equivalents and investments, Fair value	2,013,425	2,115,869
Available for sale debt securities current, Amortized cost	779,820
Available for sale debt securities current, Gross unrealized gains	32
Available for sale debt securities current, Gross unrealized losses	(304)
Available for sale debt securities current, Fair value	779,548	0
Cash and Money Market Funds [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, Amortized cost	1,054,189	2,115,869
Cash and cash equivalents	1,054,189	2,115,869
Commercial Paper [Member]
Cash and Cash Equivalents [Line Items]
Available for sale debt securities, Fair value	145,335
Cash and cash equivalents, Amortized cost	145,335
Government and Government Agency Bonds [Member]
Cash and Cash Equivalents [Line Items]
Available for sale debt securities, Gross unrealized gains	13
Available for sale debt securities, Gross unrealized losses	(205)
Available for sale debt securities, Fair value	602,288
Cash and cash equivalents, Amortized cost	602,480
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	21
Available for sale debt securities, Gross unrealized losses	(115)
Available for sale debt securities, Fair value	187,232
Cash and cash equivalents, Amortized cost	187,326
Certificates of Deposit [Member]
Cash and Cash Equivalents [Line Items]
Available for sale debt securities, Fair value	24,381
Cash and cash equivalents, Amortized cost	$ 24,381