Accrued expenses (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Bonus	$ 307,292	$ 710,739
Deferred revenue	753,787	688,418
Deferred incentive	600,000	950,000
Other	2,798,281	4,089,443
Total accrued expenses	$ 4,459,360	6,438,600
Recognition period of deferred revenue	12 months
Non-current portion of deferred revenue		600,000
Noncurrent Portion Of Deferred Incentive	$ 200,000	700,000
Multicurrency Referral Commissions	$ 500,000	$ 1,600,000
Maximum percentage of total current liabilities	10.00%	10.00%
Long-term lease and deferred income
Non-current portion of deferred revenue	$ 700,000