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Commitments and contingencies - Employment agreements and contingent liabilities and acquiring bank sponsorship agreements (Details) - USD ($)
$ in Millions
1 Months Ended
Sep. 01, 2013
Sep. 30, 2013
Mar. 31, 2017
Dec. 31, 2016
Employment agreements        
Commitment to pay severance in event of employment termination without cause     $ 1.2  
Commitment to pay severance in event of employment termination upon change of control     1.5 $ 1.4
Fraud related to certain credit card transactions        
Employment agreements        
Reserves posted by merchants with sponsor bank     1.0  
Reserves posted by entity     0.4  
Cash reserves required to be posted by merchant, entity     2.2  
Contingent liability     0.0  
Bank Sponsorship Agreement        
Employment agreements        
Contingent liability     $ 0.0  
Term of Bank Sponsorship Agreement 5 years 5 years    
Bank Sponsorship Agreement | Financial Guarantee | Minimum        
Employment agreements        
Bank sponsorship agreement annual fees in year one $ 0.3      
Bank sponsorship agreement fees final year 0.5      
Cost of sales | Bank Sponsorship Agreement | Financial Guarantee | Minimum        
Employment agreements        
Bank sponsorship agreement fees due $ 1.8