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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, 2019 | Dec. 31, 2018
Cash And Cash Equivalents And Marketable securities [Line Items] |  |
Cost | $ 92,416 | $ 100,990
Unrealized Gains (Losses) | 36 | (236)
Accrued Interest | 226 | 280
Estimated Fair Value | 92,678 | 101,034
Cash & Cash Equivalents | 76,974 | 81,364
Investment Securities | 15,704 | 19,670
Cash [Member] |  |
Cash And Cash Equivalents And Marketable securities [Line Items] |  |
Cost | 36,593 | 35,436
Estimated Fair Value | 36,593 | 35,436
Cash & Cash Equivalents | 36,593 | 35,436
Fair Value, Inputs, Level 1 [Member] |  |
Cash And Cash Equivalents And Marketable securities [Line Items] |  |
Cost | 43,213 | 48,763
Unrealized Gains (Losses) | 2 | (72)
Estimated Fair Value | 43,215 | 48,691
Cash & Cash Equivalents | 40,381 | 45,928
Investment Securities | 2,834 | 2,763
Fair Value, Inputs, Level 1 [Member] | Certificates of Deposit [Member] |  |
Cash And Cash Equivalents And Marketable securities [Line Items] |  |
Cost | 35,000 | 40,000
Estimated Fair Value | 35,000 | 40,000
Cash & Cash Equivalents | 35,000 | 40,000
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member] |  |
Cash And Cash Equivalents And Marketable securities [Line Items] |  |
Cost | 5,381 | 5,928
Estimated Fair Value | 5,381 | 5,928
Cash & Cash Equivalents | 5,381 | 5,928
Fair Value, Inputs, Level 1 [Member] | Government and Agency Securities [Member] |  |
Cash And Cash Equivalents And Marketable securities [Line Items] |  |
Cost | 2,832 | 2,835
Unrealized Gains (Losses) | 2 | (72)
Estimated Fair Value | 2,834 | 2,763
Investment Securities | 2,834 | 2,763
Fair Value, Inputs, Level 2 [Member] | Municipal Bonds [Member] |  |
Cash And Cash Equivalents And Marketable securities [Line Items] |  |
Cost | 12,610 | 16,791
Unrealized Gains (Losses) | 34 | (164)
Accrued Interest | 226 | 280
Estimated Fair Value | 12,870 | 16,907
Investment Securities | $ 12,870 | $ 16,907

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