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Derivative Instruments - Additional Information (Details) - CAD / shares shares in Thousands	Jun. 30, 2016	Dec. 31, 2011	Dec. 31, 2010
Derivative [Line Items]
Common shares issuable upon exercise of outstanding warrants	1,700
Invester Option [Member]
Derivative [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	40
Canadian Dollar [Member]
Derivative [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number		36	29
Contractor Options Expire On November 19, 2017 [Member]
Derivative [Line Items]
Common shares issuable upon exercise of outstanding warrants	21
Class of Warrant or Right, Exercise Price of Warrants or Rights	CAD 1.89
Contractor Options Expire On April 4, 2018 [Member]
Derivative [Line Items]
Common shares issuable upon exercise of outstanding warrants	17
Class of Warrant or Right, Exercise Price of Warrants or Rights	CAD 1.62
Contractor Options Expire On May 18, 2018 [Member]
Derivative [Line Items]
Common shares issuable upon exercise of outstanding warrants	2
Class of Warrant or Right, Exercise Price of Warrants or Rights	CAD 2.43

X

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(4))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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X

- Definition

Number of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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X

- Definition

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+ References

No definition available.

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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