Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Information (unaudited) - Summary of Quarterly Results of Operations (Detail)

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Quarterly Financial Information (unaudited) - Summary of Quarterly Results of Operations (Detail) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 12,625,966 $ 12,439,279 $ 9,856,317 $ 8,512,305 $ 9,333,483 $ 6,668,732 $ 6,058,125 $ 5,732,733 $ 43,433,867 $ 27,793,073 $ 25,509,572
Gross Profit 5,476,403 5,576,287 4,546,761 3,677,624 3,842,816 2,775,075 2,544,324 2,482,695 19,277,075 11,644,910 11,377,215
Total operating expenses 4,345,198 4,345,965 3,572,915 3,560,830 3,646,865 2,846,106 2,717,331 2,765,309 15,824,908 11,975,611 10,526,615
Net income (loss) $ 1,100,302 $ 1,183,044 $ 1,311,209 $ 139,153 $ (42,159) $ 669 $ (171,352) $ (57,500) $ 3,733,707 $ (270,342) $ 3,588,300
Basic net income (loss) per share $ 0.14 $ 0.21 $ 0.97 $ (0.70) $ (0.99) $ (0.93) $ (1.20) $ (1.05) $ 0.65 $ (4.17) $ 2.08
Diluted net income (loss) per share $ 0.12 $ 0.16 $ 0.15 $ (0.82) $ (0.99) $ (1.05) $ (1.22) $ (1.44) $ 0.40 $ (4.30) $ (2.86)