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Selected Quarterly Financial Data (Unaudited) - Summary of Unaudited Quarterly Statements of Comprehensive Income Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 65,189	$ 62,868	$ 61,091	$ 59,092	$ 58,057	$ 56,057	$ 54,092	$ 51,879	$ 248,240	$ 220,085	$ 193,153
Gross profit	44,012	42,457	40,689	39,334	38,598	37,412	35,901	34,549	166,492	146,460	128,807
Income from operations	8,209	8,257	5,965	4,300	292	3,354	2,956	3,379	26,731	9,981	6,385
Net income (loss)	$ 7,141	$ 8,061	$ 5,416	$ 3,254	$ (6,778)	$ 2,176	$ 1,968	$ 2,985	$ 23,872	$ 351	$ 4,963
Diluted earnings per share	$ 0.40	$ 0.45	$ 0.31	$ 0.19	$ (0.39)	$ 0.13	$ 0.11	$ 0.17	$ 1.36	$ 0.02	$ 0.29

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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