Segment information (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 item	Jun. 30, 2012	Dec. 31, 2012
Segment information
Number of reportable segments			2
Segment information
Cost of sales included in processing and services costs	$ 3,178,655	$ 2,642,590	$ 6,354,302	$ 5,373,419
Long-lived assets	10,500,000		10,500,000		9,800,000
Number of geographical regions in which the entity conducts its business			3
Net Revenue:
Net revenue	11,764,663	10,117,038	23,850,726	21,797,974
Gross Profit:
Total gross profit	8,632,951	7,682,791	17,475,220	16,580,135
Multi-currency processing services
Segment information
Cost of sales included in processing and services costs	400,000		800,000
Net Revenue:
Net revenue	7,447,187	6,840,060	15,277,916	14,362,685
Gross Profit:
Total gross profit	7,064,409	6,840,060	14,453,633	14,362,685
Payment processing services
Net Revenue:
Net revenue	4,317,476	3,276,978	8,572,810	7,435,289
Number of individual merchants with revenue greater than 10% of segment revenue			0
Gross Profit:
Total gross profit	1,568,542	842,731	3,021,587	2,217,450
Number of individual customers with revenue greater than 10% of segment revenue			0
APAC
Net Revenue:
Net revenue	3,795,160	4,064,492	7,511,832	8,254,260
Gross Profit:
Total gross profit	3,775,477	4,064,492	7,459,481	8,254,260
North America
Net Revenue:
Net revenue	1,657,383	1,106,674	3,118,484	2,076,259
Gross Profit:
Total gross profit	1,633,102	1,106,674	3,069,268	2,076,259
CEMEA
Net Revenue:
Net revenue	1,994,644	1,668,894	4,647,600	4,032,166
Gross Profit:
Total gross profit	$ 1,655,830	$ 1,668,894	$ 3,924,884	$ 4,032,166