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Stockholders' Equity (Details 4) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Weighted average fair value per warrant | 5.03 | 4.87
Risk-free interest rate | 0.99% | 1.18%
Expected lives | 7 years 6 months | 7 years
Expected volatility | 36.98% | 28.18%

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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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