Accrued expenses (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Bonus	$ 710,739	$ 116,476
Professional fees		175,465
Gift card liabilities		28,167
Deferred revenue	688,418	800,650
Deferred incentive	950,000
Other	4,089,443	1,797,887
Total accrued expenses	$ 6,438,600	2,918,645
Recognition period of deferred revenue	12 months
Non-current portion of deferred revenue		$ 1,000,000
Noncurrent Portion Of Deferred Incentive	$ 700,000
Multicurrency Referral Commissions	$ 1,600,000
Maximum percentage of total current liabilities	10.00%
Long-term lease and deferred income
Non-current portion of deferred revenue	$ 600,000