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Financial Instruments - Summary of Investments (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Short-term, Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Total short-term investments (available for sale), Cost	$ 3,037	$ 5,028
Total short-term investments (available for sale), Gross Unrealized (Loss)	(1)	(1)
Total short-term investments (available for sale), Fair value	3,036	5,027
Short-term, Non-governmental Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total short-term investments (available for sale), Cost	225,682	168,623
Total short-term investments (available for sale), Gross Unrealized Gain	3	27
Total short-term investments (available for sale), Gross Unrealized (Loss)	(2,032)	(184)
Total short-term investments (available for sale), Fair value	223,653	168,466
Short-term, Treasury and Federal Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Total short-term investments (available for sale), Cost	141,106	720
Total short-term investments (available for sale), Gross Unrealized Gain	2
Total short-term investments (available for sale), Gross Unrealized (Loss)	(957)
Total short-term investments (available for sale), Fair value	140,151	720
Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Total short-term investments (available for sale), Cost	369,825	174,371
Total short-term investments (available for sale), Gross Unrealized Gain	5	27
Total short-term investments (available for sale), Gross Unrealized (Loss)	(2,990)	(185)
Total short-term investments (available for sale), Fair value	$ 366,840	$ 174,213

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