Summary of Company Cash, Cash Equivalents and Short-term Investments (Detail) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022	Jun. 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	$ 1,861,743	1,991,011
Cash and cash equivalents, Gross unrealized gains	12	9
Cash and cash equivalents	851,929	966,777	$ 868,565
Cash, cash equivalents and investments, Amortized cost	851,917	966,768
Cash, cash equivalents and investments, Gross unrealized gains	70	187
Cash, cash equivalents and investments, Gross unrealized losses	(1,098)	(1,824)
Cash, cash equivalents and investments, Fair value	1,860,715	1,989,374
Available for sale debt securities current, Amortized cost	1,009,826	1,024,243
Available for sale debt securities current, Gross unrealized gains	58	178
Available for sale debt securities current, Gross unrealized losses	(1,098)	(1,824)
Available for sale debt securities current, Fair value	1,008,786	1,022,597
Cash and Money Market Funds [Member]
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, Amortized cost	802,149	801,979
Cash and cash equivalents	802,149	801,979
Commercial Paper [Member]
Cash and Cash Equivalents [Line Items]
Available for sale debt securities, Fair value	169,866	211,369
Cash and cash equivalents, Amortized cost	169,866	211,369
Government and Government Agency Bonds [Member]
Cash and Cash Equivalents [Line Items]
Available for sale debt securities, Gross unrealized gains	65	178
Available for sale debt securities, Gross unrealized losses	(1,079)	(1,542)
Available for sale debt securities, Fair value	859,532	807,540
Cash and cash equivalents, Amortized cost	860,546	808,904
Cash, cash equivalents and investments, Fair value	1,860,715	1,989,374
Corporate Bond [Member]
Cash and Cash Equivalents [Line Items]
Available for sale debt securities, Gross unrealized gains	5	9
Available for sale debt securities, Gross unrealized losses	(19)	(282)
Available for sale debt securities, Fair value	21,207	125,741
Cash and cash equivalents, Amortized cost	21,221	126,014
Certificates of Deposit [Member]
Cash and Cash Equivalents [Line Items]
Available for sale debt securities, Fair value	7,961	42,745
Cash and cash equivalents, Amortized cost	$ 7,961	$ 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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