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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, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Estimated Fair Value	$ 241,057	$ 373,271
Debt and equity securities, Amortized Cost	241,683	373,475
Debt and equity securities, Unrealized Gains	0	9
Debt and equity securities, Unrealized Losses	(626)	(213)
Debt and equity securities, Estimated Fair Value	241,057	373,271
US Treasury Securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	97,873	140,287
Debt securities, Unrealized Gains	0	0
Debt securities, Unrealized Losses	(211)	(100)
Debt securities, Estimated Fair Value	97,662	140,187
US Government Sponsored Enterprises Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	49,507	49,512
Debt securities, Unrealized Gains	0	0
Debt securities, Unrealized Losses	(141)	(38)
Debt securities, Estimated Fair Value	49,366	49,474
Municipal bonds
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	21,087
Debt securities, Unrealized Gains	0
Debt securities, Unrealized Losses	(31)
Debt securities, Estimated Fair Value	21,056
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost		26,006
Debt securities, Unrealized Gains		0
Debt securities, Unrealized Losses		(22)
Debt securities, Estimated Fair Value		25,984
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Debt securities, Amortized Cost	73,216	157,670
Debt securities, Unrealized Gains	0	9
Debt securities, Unrealized Losses	(243)	(53)
Debt securities, Estimated Fair Value	$ 72,973	$ 157,626

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