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Additional Cash Flow Disclosures (Tables)
 12 Months Ended
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