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Supplemental Cash Flow Information and Material Non-Cash Transactions (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jul. 31, 2012 | Apr. 30, 2011 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012
Warrants issued (in shares) |  |  |  |  | 4,757,941
Fair value of shares received |  | $ 78,872 | $ 78,872 |  |
Number of shares issued in transaction, (Shares) |  |  | 30,402,615 |  |
Compensation Options Issued to Underwriters | 166,667 | 450,000 | 450,000 |  |
Convertible debt repurchase, shares |  |  |  | 1,902,684 |
Principal and Interest on Repurchase of Convertible Debt |  |  |  | $ 6,358 |
Compensation Warrants [Member] |  |  |  |  |
Warrants issued (in shares) | 166,667 |  |  |  |

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investments accounted for under the equity method of accounting as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 6 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 323 -SubTopic 10 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6903542&loc=d3e32014-111567 + Details
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Period Type: | instant

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- Definition The number of shares issued or sold by the subsidiary or equity method investee per stock transaction. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section H + Details
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- Definition Number of compensation options issued to underwriters as part of an equity placement. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Convertible debt repurchase, shares + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Number of non-option equity instruments issued. + References No definition available. + Details
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Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition The total principal and interest payable on the repurchase convertible debt. + References No definition available. + Details
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