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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 ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Marketable securities:
Total	$ 526,581		$ 526,581		$ 793,362
Revenue	473,010	$ 375,642	919,367	$ 716,876
Money market funds \| Cash and cash equivalents:
Cash and cash equivalents:
Cash and cash equivalents	385,721		385,721		507,317
Certificates of deposit \| Cash and cash equivalents:
Cash and cash equivalents:
Cash and cash equivalents	9,358		9,358		6,844
Certificates of deposit \| Restricted cash, current and noncurrent
Restricted cash, current and noncurrent
Certificates of deposit	32,292		32,292		45,048
Marketable securities \| Marketable securities
Marketable securities:
Marketable securities	99,210		99,210		234,153
Level 1
Marketable securities:
Total	484,931		484,931		741,470
Level 1 \| Money market funds \| Cash and cash equivalents:
Cash and cash equivalents:
Cash and cash equivalents	385,721		385,721		507,317
Level 1 \| Certificates of deposit \| Cash and cash equivalents:
Cash and cash equivalents:
Cash and cash equivalents	0		0		0
Level 1 \| Certificates of deposit \| Restricted cash, current and noncurrent
Restricted cash, current and noncurrent
Certificates of deposit	0		0		0
Level 1 \| Marketable securities \| Marketable securities
Marketable securities:
Marketable securities	99,210		99,210		234,153
Level 2
Marketable securities:
Total	41,650		41,650		51,892
Level 2 \| Money market funds \| Cash and cash equivalents:
Cash and cash equivalents:
Cash and cash equivalents	0		0		0
Level 2 \| Certificates of deposit \| Cash and cash equivalents:
Cash and cash equivalents:
Cash and cash equivalents	9,358		9,358		6,844
Level 2 \| Certificates of deposit \| Restricted cash, current and noncurrent
Restricted cash, current and noncurrent
Certificates of deposit	32,292		32,292		45,048
Level 2 \| Marketable securities \| Marketable securities
Marketable securities:
Marketable securities	0		0		0
Level 3
Marketable securities:
Total	0		0		0
Level 3 \| Money market funds \| Cash and cash equivalents:
Cash and cash equivalents:
Cash and cash equivalents	0		0		0
Level 3 \| Certificates of deposit \| Cash and cash equivalents:
Cash and cash equivalents:
Cash and cash equivalents	0		0		0
Level 3 \| Certificates of deposit \| Restricted cash, current and noncurrent
Restricted cash, current and noncurrent
Certificates of deposit	0		0		0
Level 3 \| Marketable securities \| Marketable securities
Marketable securities:
Marketable securities	$ 0		$ 0		$ 0