Intangible assets amortization expenses (Details) - USD ($) |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
|
| Intangible assets amortization expenses | ||||
| Amortization expenses relating to intangible assets | $ 65,643 | $ 73,498 | $ 199,609 | $ 246,009 |