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Quarterly Financial Information from Continuing Operations - Summary of Quarterly Financial Information from Continuing Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 48,710	$ 47,383	$ 47,583	$ 50,425	$ 50,360	$ 49,543	$ 48,472	$ 45,199	$ 194,101	$ 193,574	$ 177,164
Gross profit	13,074	13,090	12,656	12,719	12,763	12,329	12,054	10,835	51,539	47,981	42,528
Net income	$ 2,025	$ 2,998	$ 2,969	$ 1,869	$ 2,274	$ 1,949	$ 5,958	$ 964	$ 9,861	$ 11,145	$ 6,691
Earnings (loss) Per Share, Basic	$ 0.18	$ 0.26	$ 0.26	$ 0.17	$ 0.21	$ 0.18	$ 0.54	$ 0.09	$ 0.87	$ 1.01	$ 0.61
Earnings (loss) Per Share, Diluted	$ 0.17	$ 0.25	$ 0.25	$ 0.16	$ 0.20	$ 0.17	$ 0.53	$ 0.09	$ 0.83	$ 0.99	$ 0.60

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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