Property and equipment (Details) - USD ($) |
9 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Property, Plant and Equipment [Abstract] | ||||
| Property, Plant and Equipment, Additions | $ 859 | $ 27,679 | ||
| Depreciation | $ 9,886 | $ 12,773 | $ 16,148 | $ 13,538 |