Earnings per Share - Computation of Basic EPS (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Net income	$ 2,274	$ 1,949	$ 5,958	$ 964	$ 874	$ 1,620	$ 2,817	$ 1,380	$ 11,145	$ 6,691	$ 1,626
Basic weighted-average shares outstanding									11,029	10,950	9,924
Basic EPS	$ 0.21	$ 0.18	$ 0.54	$ 0.09	$ 0.08	$ 0.15	$ 0.26	$ 0.13	$ 1.01	$ 0.61	$ 0.16