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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 | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Cash And Cash Equivalents And Marketable securities [Line Items] |  |
Cost | $ 113,262 | $ 100,990
Unrealized Losses | (9) | (236)
Accrued Interest | 269 | 280
Estimated Fair Value | 113,522 | 101,034
Cash & Cash Equivalents | 96,311 | 81,364
Investment Securities | 17,211 | 19,670
Cash [Member] |  |
Cash And Cash Equivalents And Marketable securities [Line Items] |  |
Cost | 32,632 | 35,436
Estimated Fair Value | 32,632 | 35,436
Cash & Cash Equivalents | 32,632 | 35,436
Fair Value, Inputs, Level 1 [Member] |  |
Cash And Cash Equivalents And Marketable securities [Line Items] |  |
Cost | 66,512 | 48,763
Unrealized Losses | (9) | (72)
Accrued Interest | 23 |
Estimated Fair Value | 66,526 | 48,691
Cash & Cash Equivalents | 63,679 | 45,928
Investment Securities | 2,847 | 2,763
Fair Value, Inputs, Level 1 [Member] | Certificates of Deposit [Member] |  |
Cash And Cash Equivalents And Marketable securities [Line Items] |  |
Cost | 60,000 | 40,000
Estimated Fair Value | 60,000 | 40,000
Cash & Cash Equivalents | 60,000 | 40,000
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member] |  |
Cash And Cash Equivalents And Marketable securities [Line Items] |  |
Cost | 3,679 | 5,928
Estimated Fair Value | 3,679 | 5,928
Cash & Cash Equivalents | 3,679 | 5,928
Fair Value, Inputs, Level 1 [Member] | Government and Agency Securities [Member] |  |
Cash And Cash Equivalents And Marketable securities [Line Items] |  |
Cost | 2,833 | 2,835
Unrealized Losses | (9) | (72)
Accrued Interest | 23 |
Estimated Fair Value | 2,847 | 2,763
Investment Securities | 2,847 | 2,763
Fair Value, Inputs, Level 2 [Member] | Municipal Bonds [Member] |  |
Cash And Cash Equivalents And Marketable securities [Line Items] |  |
Cost | 14,118 | 16,791
Unrealized Losses |  | (164)
Accrued Interest | 246 | 280
Estimated Fair Value | 14,364 | 16,907
Investment Securities | $ 14,364 | $ 16,907

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