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Financial Instruments (Cash and Available for Sale Securities Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses, and Fair Value by Significant Investment Category) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Cash And Cash Equivalents And Marketable securities [Line Items]    
Cost $ 109,464 $ 174,241
Unrealized Gains 21 87
Accrued Interest 59 147
Estimated Fair Value 109,544 174,475
Cash & Cash Equivalents 104,183 163,723
Investment Securities 5,361 10,752
Cash and cash equivalents    
Cash And Cash Equivalents And Marketable securities [Line Items]    
Cost 94,824 159,754
Estimated Fair Value 94,824 159,754
Cash & Cash Equivalents 94,824 159,754
Fair value, inputs, level 1    
Cash And Cash Equivalents And Marketable securities [Line Items]    
Cost 10,760 6,798
Unrealized Gains 12 45
Estimated Fair Value 10,772 6,843
Cash & Cash Equivalents 9,359 3,969
Investment Securities 1,413 2,874
Fair value, inputs, level 1 | Money market accounts    
Cash And Cash Equivalents And Marketable securities [Line Items]    
Cost 9,359 3,969
Estimated Fair Value 9,359 3,969
Cash & Cash Equivalents 9,359 3,969
Fair value, inputs, level 1 | Government & agency securities    
Cash And Cash Equivalents And Marketable securities [Line Items]    
Cost 1,401 2,829
Unrealized Gains 12 45
Estimated Fair Value 1,413 2,874
Investment Securities 1,413 2,874
Fair value, inputs, level 2 | Municipal bonds    
Cash And Cash Equivalents And Marketable securities [Line Items]    
Cost 3,880 7,689
Unrealized Gains 9 42
Accrued Interest 59 147
Estimated Fair Value 3,948 7,878
Investment Securities $ 3,948 $ 7,878