Consolidated Statements of Income - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenue:
Net revenue	$ 13,805,324	$ 13,621,239	$ 39,050,592	$ 40,409,128
Cost of revenue:
Payment processing service fees	2,364,028	2,781,289	6,565,082	8,207,202
Processing and service costs	3,031,105	2,878,088	9,428,424	9,902,879
Total cost of revenue	5,395,133	5,659,377	15,993,506	18,110,081
Selling, general and administrative expenses	4,621,566	5,222,560	14,590,609	15,908,166
Restructuring charges		229,121	72,742	354,389
Total operating expenses	10,016,699	11,111,058	30,656,857	34,372,636
Income from operations	3,788,625	2,510,181	8,393,735	6,036,492
Other income (expense):
Interest expense	(12,863)	(88,669)	(222,008)	(186,366)
Interest income	644	428	1,752	1,250
Other income	111,613	93,016	111,613	93,016
Total other income (expense), net	99,394	4,775	(108,643)	(92,100)
Income from operations before provision for income taxes	3,888,019	2,514,956	8,285,092	5,944,392
Provision for income taxes	(192,920)	(289,543)	(1,202,924)	(675,951)
Net income	$ 3,695,099	$ 2,225,413	$ 7,082,168	$ 5,268,441
Basic net income per share applicable to common stockholders ( in dollars per share)	$ 0.07	$ 0.04	$ 0.13	$ 0.10
Diluted net income per share applicable to common stockholders (in dollars per share)	$ 0.07	$ 0.04	$ 0.13	$ 0.09
Weighted-average common stock outstanding (basic) (in shares)	49,391,614	49,179,596	49,184,276	49,848,634
Weighted-average common stock outstanding (diluted) (in shares)	51,261,769	51,254,223	51,297,019	52,002,249