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Assets and Liabilities Measured at Fair Value (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Assets and Liabilities Measured at Fair Value [Abstract] |  |  |
Number of inputs used for valuation of warrants | 6 |  |
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Roll Forward] |  |  |
Beginning balance | $ 2,439 | $ 18,005 | $ 11,207
Total change in the fair value of the liability included in earnings | (2,159) | (15,566) | 15,951
Fair value of warrants issued | 4,055 |  |
Fair value of warrants exercised or expired | (908) |  | (9,153)
Ending balance | 3,427 | 2,439 | 18,005
Recurring [Member] | Derivative instruments liabilities [Member] |  |  |
Liabilities [Abstract] |  |  |
Total Liabilities | 3,427 | 2,439 |
Recurring [Member] | Derivative instruments liabilities [Member] | Level 1 [Member] |  |  |
Liabilities [Abstract] |  |  |
Total Liabilities | 0 | 0 |
Recurring [Member] | Derivative instruments liabilities [Member] | Level 2 [Member] |  |  |
Liabilities [Abstract] |  |  |
Total Liabilities | 0 | 0 |
Recurring [Member] | Derivative instruments liabilities [Member] | Level 3 [Member] |  |  |
Liabilities [Abstract] |  |  |
Total Liabilities | 3,427 | 2,439 |
Recurring [Member] | Money market funds [Member] |  |  |
Assets [Abstract] |  |  |
Total Assets | 1,967 | 25,417 |
Recurring [Member] | Money market funds [Member] | Level 1 [Member] |  |  |
Assets [Abstract] |  |  |
Total Assets | 1,967 | 25,417 |
Recurring [Member] | Money market funds [Member] | Level 2 [Member] |  |  |
Assets [Abstract] |  |  |
Total Assets | 0 | 0 |
Recurring [Member] | Money market funds [Member] | Level 3 [Member] |  |  |
Assets [Abstract] |  |  |
Total Assets | $ 0 | $ 0 |

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in earnings, arising from liabilities measured at fair value on a recurring basis using unobservable inputs (level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(1) -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. + Details
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- Definition Issues that have taken place during the period in relation to liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Settlements that have taken place during the period in relation to liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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