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Additional Cash Flow Disclosures (Tables) | 12 Months Ended
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Dec. 31, 2017
Statement of cash flows [abstract] |
Net change in non-cash working capital | Net Change In Non-Cash Working Capital
| 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 | )
Other cash flow disclosures | Other Cash Flow Disclosures
| 2017 $ | 2016 $ | 2015 $
Cash interest received | 130,101 |  | 163,902 |  | 197,859 |
Cash taxes paid | 136,163 |  | 4,468 |  | 3,421 |

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