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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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Net (Loss) Income, Basic	$ (560)	$ 361	$ 2,726	$ 22,659
Net (Loss) Income, Diluted	$ (560)	$ 361	$ 2,726	$ 22,659
Weighted Average Number of Shares Outstanding, Basic	2,097,737	2,199,750	2,119,343	2,241,310
Weighted Average Number of Shares Outstanding, Options		749,491	753,404	751,019
Weighted Average Number of Shares Outstanding, Diluted	2,097,737	2,949,261	2,873,347	2,992,329
Per Share Amount, Basic	$ (0.27)	$ 0.16	$ 1.29	$ 10.11
Per Share Amount, Diluted	$ (0.27)	$ 0.12	$ 0.95	$ 7.57

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