Summary of Company Cash, Cash Equivalents and Short-term Investments (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 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	$ 1,734,153	1,991,011
Cash and cash equivalents, Gross unrealized gains	8	9
Cash and cash equivalents, Gross unrealized losses	(2)
Cash and cash equivalents, Fair value	541,932	966,777	$ 1,038,624
Cash, cash equivalents and investments, Amortized cost	541,926	966,768
Cash, cash equivalents and investments, Gross unrealized gains	57	187
Cash, cash equivalents and investments, Gross unrealized losses	(668)	(1,824)
Cash, cash equivalents and investments, Fair value	1,733,542	1,989,374
Available for sale debt securities current, Amortized cost	1,192,227	1,024,243
Available for sale debt securities current, Gross unrealized gains	49	178
Available for sale debt securities current, Gross unrealized losses	666	(1,824)
Available for sale debt securities current, Fair value	1,191,610	1,022,597
Cash and Money Market Funds [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, Amortized cost	464,871	801,979
Cash and cash equivalents, Fair value	464,871	801,979
Commercial Paper [Member]
Cash and Cash Equivalents [Line Items]
Available for sale debt securities, Fair value	88,450	211,369
Cash and cash equivalents, Amortized cost	88,450	211,369
Government and Government Agency Bonds [Member]
Cash and Cash Equivalents [Line Items]
Available for sale debt securities, Gross unrealized gains	41	178
Available for sale debt securities, Gross unrealized losses	(581)	(1,542)
Available for sale debt securities, Fair value	989,257	807,540
Cash and cash equivalents, Amortized cost	989,797	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	16	9
Available for sale debt securities, Gross unrealized losses	(87)	(282)
Available for sale debt securities, Fair value	145,898	125,741
Cash and cash equivalents, Amortized cost	145,969	126,014
Certificates of Deposit [Member]
Cash and Cash Equivalents [Line Items]
Available for sale debt securities, Fair value	45,066	42,745
Cash and cash equivalents, Amortized cost	$ 45,066	$ 42,745

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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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