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Investments - Carrying Value and Amortized Cost of Company's Investments Summarized by Major Security Type (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Estimated Fair Value	$ 273,281	$ 305,930
Equity securities, Amortized Cost	273,257
Equity securities, Unrealized Gains	34
Equity securities, Unrealized Losses	(10)
Equity securities, Estimated Fair Value	273,281
Debt and equity securities, Amortized Cost	273,257	305,899
Debt and equity securities, Unrealized Gains	34	74
Debt and equity securities, Unrealized Losses	(10)	(43)
Debt and equity securities, Estimated Fair Value	273,281	305,930
US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	139,390	205,111
Debt securities, Unrealized Gains	25	6
Debt securities, Unrealized Losses		(27)
Debt securities, Estimated Fair Value	139,415	205,090
US Government Sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	20,004	10,004
Debt securities, Unrealized Losses	(3)	(5)
Debt securities, Estimated Fair Value	20,001	9,999
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	2,999	52,341
Debt securities, Unrealized Gains	2	47
Debt securities, Estimated Fair Value	3,001	52,388
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	110,864	38,443
Debt securities, Unrealized Gains	7	21
Debt securities, Unrealized Losses	(7)	(11)
Debt securities, Estimated Fair Value	$ 110,864	$ 38,453

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