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Sale Of Common Shares And Issuance Of Common Stock Warrants (Details) (USD $) |  |  |  | 3 Months Ended |  | 3 Months Ended |
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May 02, 2012 | Mar. 31, 2012 | Mar. 31, 2011 | Mar. 31, 2012 Series A Common Share Warrants [Member] | Mar. 31, 2011 Series A Common Share Warrants [Member] | Mar. 31, 2012 Series B Common Share Warrants [Member] | Mar. 31, 2011 Series B Common Share Warrants [Member]
Sale Of Common Shares And Issuance Of Common Stock Warrants [Line Items] |  |  |  |  |  |  |
Common share warrants outstanding |  | 227,376 | 227,376 |  | 35,992 |  | 35,992
Common share warrants exercise price | $ 12.50 |  | $ 76.41 |  |  |  |
Common share warrants expiration dates |  |  |  | Jun. 10, 2011 |  | Dec. 20, 2011 |

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- Definition The exercise price of each class 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=6881521&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Subparagraph 4 -Article 4 + Details
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- Definition Aggregate amount of each class of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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=6881521&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Article 4 + Details
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