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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, 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
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 50,360	$ 49,543	$ 48,472	$ 45,199	$ 44,645	$ 44,292	$ 44,894	$ 43,333	$ 193,574	$ 177,164	$ 147,882
Gross profit	12,763	12,329	12,054	10,835	10,665	10,710	10,892	10,261	47,981	42,528	31,629
Net income	$ 2,274	$ 1,949	$ 5,958	$ 964	$ 874	$ 1,620	$ 2,817	$ 1,380	$ 11,145	$ 6,691	$ 1,626
Earnings (loss) Per Share, Basic	$ 0.21	$ 0.18	$ 0.54	$ 0.09	$ 0.08	$ 0.15	$ 0.26	$ 0.13	$ 1.01	$ 0.61	$ 0.16
Earnings (loss) Per Share, Diluted	$ 0.20	$ 0.17	$ 0.53	$ 0.09	$ 0.08	$ 0.14	$ 0.25	$ 0.12	$ 0.99	$ 0.60	$ 0.16

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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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