2017 $ | 2016 $ | 2015 $ | ||||
Change in: | ||||||
Contract receivable | (4,767,100 | ) | — | — | ||
Other receivables | 16,680 | 285,653 | (148,308 | ) | ||
Prepaid expenses | (915,222 | ) | 245,828 | (215,116 | ) | |
Accounts payable and accrued liabilities | (384,641 | ) | 1,359,172 | (664,505 | ) | |
Contract liability | 6,182,580 | — | — | |||
Non-cash impact of foreign exchange | 48,558 | 343,212 | (77,535 | ) | ||
Change in non-cash working capital related to operating activities | 180,855 | 2,233,865 | (1,105,464 | ) |
2017 $ | 2016 $ | 2015 $ | ||||
Cash interest received | 130,101 | 163,902 | 197,859 | |||
Cash taxes paid | 136,163 | 4,468 | 3,421 |