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Additional Cash Flow Disclosures
 12 Months Ended
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