Income taxes (Details 2)	Dec. 31, 2016 USD ($)
Deferred tax assets:
Operating loss carryforwards - Mexico	$ 5,545,008
Operating loss carryforwards - United States	150,758
Valuation allowances	(5,695,766)
Deferred Tax Assets, Net of Valuation Allowance	0
Deferred tax liabilities:
Property and equipment	129,041
Intangible assets	1,786,200
Deferred Tax Liabilities, Gross	1,915,241
Net deferred tax liability	$ 1,915,241