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Warrants Outstanding and Exercisable (Details) (USD $) | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | --- | ---
Warrant, exercise price | 7.28 | 22.08 | 25.84
Warrants, Outstanding as of end of period | 5,131,000 | 2,287,000 | 1,042,000
Warrants, Exercisable at end of period | 3,031,000 |  |
Warrants exercisable, weighted average exercise price | $ 10.49 |  |
2.13 |  |  |
Warrants, Outstanding as of end of period | 1,000,000 |  |
Warrants outstanding, weighted average remaining contractual life, years | 2.39 |  |
Warrants outstanding, weighted average exercise price | 2.13 |  |
Warrants, Exercisable at end of period | 1,000,000 |  |
Warrants exercisable, weighted average exercise price | $ 2.13 |  |
2.65 |  |  |
Warrants, Outstanding as of end of period | 2,100,000 |  |
Warrants outstanding, weighted average remaining contractual life, years | 4.47 |  |
Warrants outstanding, weighted average exercise price | 2.65 |  |
Warrants, Exercisable at end of period | 0 |  |
Warrants exercisable, weighted average exercise price | $ 0 |  |
6.24 |  |  |
Warrants, Outstanding as of end of period | 1,278,000 |  |
Warrants outstanding, weighted average remaining contractual life, years | 3.88 |  |
Warrants outstanding, weighted average exercise price | 6.24 |  |
Warrants, Exercisable at end of period | 1,278,000 |  |
Warrants exercisable, weighted average exercise price | $ 6.24 |  |
28.80 |  |  |
Warrants, Outstanding as of end of period | 753,000 |  |
Warrants outstanding, weighted average remaining contractual life, years | 0.56 |  |
Warrants outstanding, weighted average exercise price | 28.00 |  |
Warrants, Exercisable at end of period | 753,000 |  |
Warrants exercisable, weighted average exercise price | $ 28.80 |  |

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- Definition Warrants, Weighted-Average Exercise Price, Exercisable + References No definition available. + Details
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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 SEC -Name Regulation S-X (SX) -Number 210 -Article 4 -Section 08 -Paragraph i -Subparagraph 4 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)(4)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 + Details
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- Definition The specified number of securities that each class of warrants or rights outstanding give the holder the right but not the obligation to purchase from the issuer at a specific price, on or before a certain date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 4 -Section 08 -Paragraph i -Subparagraph 2 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)(2)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 + Details
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