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Earnings Per Share - Computation of Basic and Diluted Earnings (Loss) Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Share [Abstract]        
Net (Loss) Income, Basic $ (1,163) $ 6,501 $ (5,021) $ 65
Net (Loss) Income, Diluted $ (1,163) $ 6,501 $ (5,021) $ 65
Weighted Average Number of Shares Outstanding, Basic 1,994,177 1,994,177 1,994,177 1,994,175
Weighted Average Number of Shares Outstanding, Options [1]   756,154   758,367
Weighted Average Number of Shares Outstanding, Diluted 1,994,177 2,750,331 1,994,177 2,752,542
Per Share Amount, Basic $ (0.58) $ 3.26 $ (2.52) $ 0.03
Per Share Amount, Diluted $ (0.58) $ 2.36 $ (2.52) $ 0.02
[1] The effect of the 767,500 outstanding stock options is antidilutive for the nine and three months ended September 30, 2021 due to net loss for these periods.