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Additional Cash Flow Disclosures | 12 Months Ended
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Dec. 31, 2018
Statement of cash flows [abstract] |
Additional Cash Flow Disclosures | Additional Cash Flow Disclosures Net Change In Non-Cash Working Capital
| 2018 $ | 2017 $ | 2016 $
Change in: |  |  |  |  |  |
Contract receivable | 4,767,100 |  | (4,767,100 | ) | — |
Other receivables | (13,924 | ) | 16,680 |  | 285,653 |
Prepaid expenses | 475,077 |  | (915,222 | ) | 245,828 |
Accounts payable and accrued liabilities | (1,858,170 | ) | (384,641 | ) | 1,359,172 |
Contract liability | 547,707 |  | 6,182,580 |  | — |
Other liabilities | (27,982 | ) | — |  | — |
Non-cash impact of foreign exchange | 14,531 |  | 48,558 |  | 343,212 |
Change in non-cash working capital related to operating activities | 3,904,339 |  | 180,855 |  | 2,233,865 |
Other Cash Flow Disclosures
| 2018 $ | 2017 $ | 2016 $
Cash interest received | 173,496 |  | 130,101 |  | 163,902 |
Cash taxes paid | 15,728 |  | 136,163 |  | 4,468 |

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