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Quarterly Financial Information (unaudited) - Summary of Quarterly Results of Operations (Detail) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 12,807,175	$ 12,448,436	$ 13,013,143	$ 11,252,417	$ 12,625,966	$ 12,439,279	$ 9,856,317	$ 8,512,305	$ 49,521,171	$ 43,433,867	$ 27,793,073
Gross Profit	5,888,332	6,003,892	6,121,524	5,288,458	5,476,403	5,576,287	4,546,761	3,677,624	23,302,206	19,277,075	11,644,910
Total operating expenses	5,418,089	5,803,260	6,248,678	4,862,979	4,345,198	4,345,965	3,572,915	3,560,830	22,333,006	15,824,908	11,975,611
Net income (loss)	$ 591,933	$ 234,353	$ (70,121)	$ 385,090	$ 1,100,302	$ 1,183,044	$ 1,311,209	$ 139,153	$ 1,141,255	$ 3,733,707	$ (270,342)
Basic net income (loss) per share	$ 0.06	$ 0.02	$ (0.01)	$ 0.04	$ 0.14	$ 0.21	$ 0.97	$ (0.70)	$ 0.12	$ 0.65	$ (4.17)
Diluted net income (loss) per share	$ 0.06	$ 0.02	$ (0.01)	$ 0.04	$ 0.12	$ 0.16	$ 0.15	$ (0.82)	$ 0.11	$ 0.40	$ (4.30)

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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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