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Investments and Fair Value Measurements - Summary Of Assets And Liabilities That Are Measured At Fair Value On A Recurring And Nonrecurring Basis (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Marketable securities:
Debt securities	$ 2,834,940,000	$ 0
Total	3,435,491,000	1,209,935,000
Revenues	2,225,012,000	1,905,871,000	$ 1,541,889,000
Level 1
Marketable securities:
Total	594,836,000	1,184,437,000
Level 2
Marketable securities:
Total	2,840,655,000	25,498,000
Level 3
Marketable securities:
Total	0	0
U.S. treasury securities
Marketable securities:
Debt securities	2,834,940,000
Cash and Cash Equivalents \| Money market funds
Cash and cash equivalents:
Cash and cash equivalents	576,565,000	1,149,302,000
Cash and Cash Equivalents \| Money market funds \| Level 1
Cash and cash equivalents:
Cash and cash equivalents	576,565,000	1,149,302,000
Cash and Cash Equivalents \| Money market funds \| Level 2
Cash and cash equivalents:
Cash and cash equivalents	0	0
Cash and Cash Equivalents \| Money market funds \| Level 3
Cash and cash equivalents:
Cash and cash equivalents	0	0
Cash and Cash Equivalents \| U.S. treasury securities
Cash and cash equivalents:
Cash and cash equivalents	10,079,000
Marketable securities:
Debt securities	10,079,000
Cash and Cash Equivalents \| U.S. treasury securities \| Level 1
Cash and cash equivalents:
Cash and cash equivalents	0
Cash and Cash Equivalents \| U.S. treasury securities \| Level 2
Cash and cash equivalents:
Cash and cash equivalents	10,079,000
Cash and Cash Equivalents \| U.S. treasury securities \| Level 3
Cash and cash equivalents:
Cash and cash equivalents	0
Cash and Cash Equivalents \| Certificates of deposit
Cash and cash equivalents:
Cash and cash equivalents	938,000	6,791,000
Cash and Cash Equivalents \| Certificates of deposit \| Level 1
Cash and cash equivalents:
Cash and cash equivalents	0	0
Cash and Cash Equivalents \| Certificates of deposit \| Level 2
Cash and cash equivalents:
Cash and cash equivalents	938,000	6,791,000
Cash and Cash Equivalents \| Certificates of deposit \| Level 3
Cash and cash equivalents:
Cash and cash equivalents	0	0
Prepaid Expenses and Other Current Assets and Other Assets \| Certificates of deposit
Prepaid expenses and other current assets and other assets:
Certificates of deposit	4,777,000	18,707,000
Prepaid Expenses and Other Current Assets and Other Assets \| Certificates of deposit \| Level 1
Prepaid expenses and other current assets and other assets:
Certificates of deposit	0	0
Prepaid Expenses and Other Current Assets and Other Assets \| Certificates of deposit \| Level 2
Prepaid expenses and other current assets and other assets:
Certificates of deposit	4,777,000	18,707,000
Prepaid Expenses and Other Current Assets and Other Assets \| Certificates of deposit \| Level 3
Prepaid expenses and other current assets and other assets:
Certificates of deposit	0	0
Marketable Securities \| U.S. treasury securities
Marketable securities:
Debt securities	2,824,861,000
Marketable Securities \| U.S. treasury securities \| Level 1
Marketable securities:
Debt securities	0
Marketable Securities \| U.S. treasury securities \| Level 2
Marketable securities:
Debt securities	2,824,861,000
Marketable Securities \| U.S. treasury securities \| Level 3
Marketable securities:
Debt securities	0
Marketable Securities \| U.S. treasury securities
Marketable securities:
U.S. treasury securities	18,271,000	35,135,000
Marketable Securities \| U.S. treasury securities \| Level 1
Marketable securities:
U.S. treasury securities	18,271,000	35,135,000
Marketable Securities \| U.S. treasury securities \| Level 2
Marketable securities:
U.S. treasury securities	0	0
Marketable Securities \| U.S. treasury securities \| Level 3
Marketable securities:
U.S. treasury securities	$ 0	$ 0