Accrued expenses and other current liabilities (Details) - USD ($)	Jun. 30, 2016	Dec. 31, 2015
Payables and Accruals [Abstract]
Payroll and employee-related costs	$ 1,079,260	$ 1,299,248
Research and development costs	502,396	307,666
Professional fees	130,889	129,625
Consumer product-related costs	33,790	198,887
Other	15,442	11,948
Total	$ 1,761,777	$ 1,947,374