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Common Shares (Warrants) (Details) - Warrants - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Warrants outstanding, beginning of period (in shares) |  |  | 15,219,802 | 19,977,743 |
Warrants expired (in shares) |  |  | (15,219,802) | (4,757,941) |
Issued (in shares) | 6,514,625 | 6,514,625 |  |  |
Warrants outstanding, end of period (in shares) |  | 6,514,625 |  | 15,219,802 | 19,977,743
Weighted average exercise price of warrants outstanding (in dollars per share) | $ 1.92 | $ 1.92 |  | $ 5.00 | $ 4.63
Weighted average exercise price per share of warrants issued (in dollars per share) |  | $ 1.92 |  |  |
Weighted average remaining life, warrants outstanding |  | 2 years 7 months 6 days |  | 9 months 18 days | 1 year 7 months 6 days
Weighted average remaining life, warrants issued |  | 2 years 7 months 6 days |  |  |

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- 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 + Details
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- 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 + Details
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- Definition Number of shares under non-option equity instrument agreements that were either cancelled or expired. + 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)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Exercise price per share or per unit of warrants or rights issued. + References No definition available. + Details
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- Definition Weighted average remaining contractual term equity-based awards issued excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Represents the number of warrants issued during the period. + References No definition available. + Details
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