Segment information (Details) (USD $)	12 Months Ended
	Dec. 31, 2012 item	Dec. 31, 2011	Dec. 31, 2010
Segment information
Number of reportable segments	2
Segment information
Long-lived assets	$ 9,800,000	$ 7,000,000
Number of geographical regions in which the entity conducts its business	3
Net Revenue:
Net revenue	43,578,016	41,858,166	30,553,164
Gross Profit:
Total gross profit	32,634,726	30,181,154	20,501,524
Multi-currency processing services
Net Revenue:
Net revenue	28,807,090	27,238,762	17,973,237
Gross Profit:
Total gross profit	28,807,090	27,238,762	17,973,237
Payment processing services
Net Revenue:
Net revenue	147,700,926	14,619,404	12,579,927
Gross Profit:
Total gross profit	3,827,636	2,942,392	2,528,287
North America | Multi-currency processing services
Net Revenue:
Net revenue	5,000,064	3,991,374	2,647,547
Gross Profit:
Total gross profit	5,000,064	3,991,374	2,647,547
APAC | Multi-currency processing services
Net Revenue:
Net revenue	16,248,880	18,337,513	15,198,058
Gross Profit:
Total gross profit	16,248,880	18,337,513	15,198,058
CEMEA | Multi-currency processing services
Net Revenue:
Net revenue	7,558,146	4,909,875	127,632
Gross Profit:
Total gross profit	$ 7,558,146	$ 4,909,875	$ 127,632