Annual report pursuant to Section 13 and 15(d)

Quarterly Results of Operations (Unaudited) (Details)

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Quarterly Results of Operations (Unaudited) (Details) - 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 Results of Operations (Unaudited)                      
Revenues $ 16,971,005 $ 16,046,253 $ 15,168,064 $ 12,241,073 $ 11,408,672 $ 11,205,224 $ 10,381,883 $ 8,111,759 $ 60,426,395 $ 41,107,538 $ 27,331,092
Gross profit 14,356,547 13,541,975 12,890,863 10,325,425 9,578,868 9,507,781 8,847,471 6,706,168 51,114,810 34,640,288 22,482,696
Net loss $ (2,499,179) $ (2,124,079) $ (2,060,179) $ (3,762,025) $ (5,626,984) $ (2,305,373) $ (2,802,696) $ (3,676,091) $ (10,445,462) $ (14,411,144) $ (13,356,425)
Loss Per Common share - basic and diluted (in dollars per share) $ (0.07) $ (0.06) $ (0.06) $ (0.11) $ (0.17) $ (0.08) $ (0.09) $ (0.12) $ (0.31) $ (0.47) $ (0.51)