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Stockholders' Equity (Details 1) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2012 | Dec. 31, 2011
2009 Warrants [Member] |  |
Fair value assumptions of warrants |  |
Expected term (in years) | 1 year 10 months 24 days | 2 years 7 months 24 days
Estimated volatility | 50.00% | 74.00%
Risk-free interest rate | 0.23% | 0.36%
Expected dividend yield | 0.00% | 0.00%
2010 Warrants [Member] |  |
Fair value assumptions of warrants |  |
Expected term (in years) | 3 years 1 month 10 days | 3 years 10 months 10 days
Estimated volatility | 58.00% | 70.00%
Risk-free interest rate | 0.31% | 0.60%
Expected dividend yield | 0.00% | 0.00%

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- Definition Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price). + 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 (e) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price. + 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 (e) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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