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Investments - Carrying Value and Amortized Cost of Company's Investments Summarized by Major Security Type (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Estimated Fair Value	$ 289,962	$ 305,930
Equity securities, Amortized Cost	289,933
Equity securities, Unrealized Gains	37
Equity securities, Estimated Fair Value	289,962
Debt and equity securities, Amortized Cost	289,933	305,899
Debt and equity securities, Unrealized Gains	37	74
Debt and equity securities, Unrealized Losses		(43)
Debt and equity securities, Estimated Fair Value	289,962	305,930
US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	99,470	205,111
Debt securities, Unrealized Gains	11	6
Debt securities, Unrealized Losses		(27)
Debt securities, Estimated Fair Value	99,480	205,090
US Government Sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	20,002	10,004
Debt securities, Unrealized Losses		(5)
Debt securities, Estimated Fair Value	20,001	9,999
Municipal bonds
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	6,618
Debt securities, Estimated Fair Value	6,615
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	163,843	38,443
Debt securities, Unrealized Gains	26	21
Debt securities, Unrealized Losses		(11)
Debt securities, Estimated Fair Value	$ 163,866	$ 38,453

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