Consolidated Statements of Income - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenue:
Net revenue	$ 54,337,407	$ 52,815,088	$ 47,368,739
Cost of revenue:
Payment processing service fees	10,450,006	10,903,660	10,403,679
Processing and service costs	12,701,351	14,860,804	13,483,282
Total cost of revenue	23,151,357	25,764,464	23,886,961
Selling, general and administrative expenses	20,860,469	20,408,308	18,370,691
Restructuring charges	504,141	283,726	1,227,204
Total operating expenses	44,515,967	46,456,498	43,484,856
Income from operations	9,821,440	6,358,590	3,883,883
Other (expense) income:
Interest expense	(273,873)	(57,575)	(65,122)
Interest income	1,763	1,579	2,212
Other income	93,016	89,494	139,875
Total other (expense) income, net	(179,094)	33,498	76,965
Income from operations before benefit (provision) for income taxes	9,642,346	6,392,088	3,960,848
Benefit (provision) for income taxes	15,429,656	3,970,360	(800,463)
Net income	$ 25,072,002	$ 10,362,448	$ 3,160,385
Basic net income per share applicable to common stockholders ( in dollars per share)	$ 0.46	$ 0.17	$ 0.05
Diluted net income per share applicable to common stockholders (in dollars per share)	$ 0.44	$ 0.17	$ 0.05
Weighted-average common stock outstanding (basic) (in shares)	49,472,512	52,545,934	53,494,952
Weighted-average common stock outstanding (diluted) (in shares)	51,560,798	53,271,248	54,633,181