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Warrant Liability (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jul. 31, 2008 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Warrant Liability [Abstract] |  |  |  |  |
Units issued in direct offering | 6,686,650 |  |  | 12,600,000 |
Common shares per unit | 1 |  |  |  |
Proceeds from direct offering | $ 17,500 |  |  |  |
Shares entitled per warrant | 0.5 |  |  |  |
Aggregate shares common stock callable by warrants | 3,343,325 |  |  |  |
Exercise price of warrants | 3.62 |  |  |  |
Change in fair value of warrant liability |  |  | $ (401) | $ 267 | $ (401)
Equity issuance, price per share | $ 2.68 |  |  |  |

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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 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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