Financial assets
| December
31, 2017 |
December
31, 2016 |
December
31, 2015 |
||||||||||
| Cash and cash equivalents | $ | 58,143 | $ | 55,393 | $ | 134,574 | ||||||
| Trade and other receivables | 407,010 | 900,077 | 842,879 | |||||||||
| Total financial assets | $ | 465,153 | $ | 955,470 | $ | 977,453 | ||||||