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Additional Information with Respect to Options Granted, Vested and Exercised (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |  |
Aggregate grant date fair value of stock options vested during the year | $ 89 | $ 543 | $ 1,954

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Grant Date Fair Value of Options Vested. + References No definition available. + Details
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