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Financial Instruments - Summary of Investments (Detail) - USD ($)
$ in Thousands
Sep. 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 $ 3,026 $ 5,028
Total short-term investments (available for sale), Gross Unrealized (Loss) (26) (1)
Total short-term investments (available for sale), Fair value 3,000 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 211,819 168,623
Total short-term investments (available for sale), Gross Unrealized Gain   27
Total short-term investments (available for sale), Gross Unrealized (Loss) (3,418) (184)
Total short-term investments (available for sale), Fair value 208,401 168,466
Short-term, Treasury and Federal Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total short-term investments (available for sale), Cost 167,021 720
Total short-term investments (available for sale), Gross Unrealized Gain 3  
Total short-term investments (available for sale), Gross Unrealized (Loss) (2,554)  
Total short-term investments (available for sale), Fair value 164,470 720
Short-term Investments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Total short-term investments (available for sale), Cost 381,866 174,371
Total short-term investments (available for sale), Gross Unrealized Gain 3 27
Total short-term investments (available for sale), Gross Unrealized (Loss) (5,998) (185)
Total short-term investments (available for sale), Fair value $ 375,871 $ 174,213