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Investments - Carrying Value and Amortized Cost of Company's Investments Summarized by Major Security Type (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Estimated Fair Value	$ 445,651	$ 305,930
Equity securities, Amortized Cost	445,663
Equity securities, Unrealized Gains	28
Equity securities, Unrealized Losses	(40)
Equity securities, Estimated Fair Value	445,651
Debt and equity securities, Amortized Cost	445,663	305,899
Debt and equity securities, Unrealized Gains	28	74
Debt and equity securities, Unrealized Losses	(40)	(43)
Debt and equity securities, Estimated Fair Value	445,651	305,930
US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	179,885	205,111
Debt securities, Unrealized Gains	4	6
Debt securities, Unrealized Losses	(11)	(27)
Debt securities, Estimated Fair Value	179,878	205,090
US Government Sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	56,018	10,004
Debt securities, Unrealized Losses	(6)	(5)
Debt securities, Estimated Fair Value	56,012	9,999
Municipal bonds
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	19,129
Debt securities, Unrealized Losses	(7)
Debt securities, Estimated Fair Value	19,122
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost		52,341
Debt securities, Unrealized Gains		47
Debt securities, Estimated Fair Value		52,388
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	190,631	38,443
Debt securities, Unrealized Gains	24	21
Debt securities, Unrealized Losses	(16)	(11)
Debt securities, Estimated Fair Value	$ 190,639	$ 38,453

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