Commitments and contingencies (Details 4) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2013 item	Dec. 31, 2012	Dec. 31, 2013 Fraud related to certain credit card transactions	Sep. 01, 2013 Bank Sponsorship Agreement	Dec. 31, 2013 Bank Sponsorship Agreement	Sep. 01, 2013 Bank Sponsorship Agreement Financial Guarantee Minimum
Contingent liabilities
Term of Bank Sponsorship Agreement				5 years
Bank sponsorship agreement fees due						$ 1,800,000
Contingent liability	0				0
Number of acquiring bank sponsoring agreements	2
Future minimum payments under acquiring bank sponsorship agreements
2014	356,667
2015	316,667
2016	366,667
2017	416,667
2018	300,000
Total payments	1,756,668
Employment agreements
Commitment to pay severance in event of employment termination without cause	2,000,000	1,600,000
Commitment to pay severance in event of employment termination upon change of control	2,300,000	1,900,000
Cash reserves required to be posted by merchant			$ 200,000