Financial Instruments - Summary of Investments (Detail) - USD ($) $ in Thousands	Mar. 31, 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	$ 5,000	$ 5,028
Total short-term investments (available for sale), Gross Unrealized (Loss)		(1)
Total short-term investments (available for sale), Fair value	5,000	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	208,401	168,623
Total short-term investments (available for sale), Gross Unrealized Gain	3	27
Total short-term investments (available for sale), Gross Unrealized (Loss)	(1,192)	(184)
Total short-term investments (available for sale), Fair value	207,212	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	95,737	720
Total short-term investments (available for sale), Gross Unrealized (Loss)	(329)
Total short-term investments (available for sale), Fair value	95,408	720
Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Total short-term investments (available for sale), Cost	309,138	174,371
Total short-term investments (available for sale), Gross Unrealized Gain	3	27
Total short-term investments (available for sale), Gross Unrealized (Loss)	(1,521)	(185)
Total short-term investments (available for sale), Fair value	$ 307,620	$ 174,213