Summary of Company Cash, Cash Equivalents and Short-term Investments (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Cash and Cash Equivalents [Line Items]
Available for sale debt securities, Gross unrealized gains		$ 187
Available for sale debt securities, Gross unrealized losses		(1,824)
Cash and cash equivalents, Amortized cost	$ 1,882,489	1,991,011
Cash and cash equivalents, Gross unrealized gains	1	9
Cash and cash equivalents, Gross unrealized losses	(1)
Cash and cash equivalents	871,668	966,777	$ 1,233,877
Cash, cash equivalents and investments, Amortized cost	871,668	966,768
Cash, cash equivalents and investments, Gross unrealized gains	402	187
Cash, cash equivalents and investments, Gross unrealized losses	(794)	1,824
Cash, cash equivalents and investments, Fair value	1,882,097	1,989,374
Available for sale debt securities current, Amortized cost	1,010,821	1,024,243
Available for sale debt securities current, Gross unrealized gains	401	178
Available for sale debt securities current, Gross unrealized losses	(793)	1,824
Available for sale debt securities current, Fair value	1,010,429	1,022,597
Cash and Money Market Funds [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, Amortized cost	791,456	801,979
Cash and cash equivalents	791,456	801,979
Commercial Paper [Member]
Cash and Cash Equivalents [Line Items]
Available for sale debt securities, Fair value	208,937	211,369
Cash and cash equivalents, Amortized cost	208,937	211,369
Government and Government Agency Bonds [Member]
Cash and Cash Equivalents [Line Items]
Available for sale debt securities, Gross unrealized gains	402	178
Available for sale debt securities, Gross unrealized losses	(701)	(1,542)
Available for sale debt securities, Fair value	844,838	807,540
Cash and cash equivalents, Amortized cost	845,137	808,904
Cash, cash equivalents and investments, Fair value		1,989,374
Corporate Bond [Member]
Cash and Cash Equivalents [Line Items]
Available for sale debt securities, Gross unrealized gains		9
Available for sale debt securities, Gross unrealized losses	(93)	(282)
Available for sale debt securities, Fair value	15,723	125,741
Cash and cash equivalents, Amortized cost	15,816	126,014
Certificates of Deposit [Member]
Cash and Cash Equivalents [Line Items]
Available for sale debt securities, Fair value	21,143	42,745
Cash and cash equivalents, Amortized cost	$ 21,143	$ 42,745

Available for sale debt securities current accumulated gross unrealized gain before tax.

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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