Accrued expenses and other current liabilities (Details) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Payables and Accruals [Abstract]
Research and development costs	$ 1,858,526	$ 938,665
Consumer product-related costs	507,691	42,024
Payroll and employee-related costs	505,489	1,453,665
Professional fees	208,688	153,219
Other	50,000	0
Total	$ 3,130,394	$ 2,587,573