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Quarterly Financial Information (unaudited) - Summary of Quarterly Results of Operations (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
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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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