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Fair Value (Details 4) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Reconciliation of the beginning and ending balance of Level 3 inputs |  |  |  |  |  |  |
Balance at the end of the period | $ 1,090,000 |  | $ 1,090,000 |  | $ 71,000 | $ 680,000 |
Warrants |  |  |  |  |  |  |
Reconciliation of the beginning and ending balance of Level 3 inputs |  |  |  |  |  |  |
Change in valuation of liability | (1,000) | (400,000) | (51,000) | (600,000) | (629,000) | 300,000 | 300,000
Derivative |  |  |  |  |  |  |
Reconciliation of the beginning and ending balance of Level 3 inputs |  |  |  |  |  |  |
Change in valuation of liability |  |  |  |  | $ (20,000) |  |

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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of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 This element represents a liability measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. + 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) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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