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Derivative Financial Instruments (Details 2) (Monte carlo simulations [Member], Senior Convertible Notes [Member], USD $) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2012 | Dec. 31, 2011
Significant assumptions utilized in valuation technique |  |
Quoted market price on valuation date | $ 3.725 | $ 2.74
Contractual conversion rate | $ 3.74 | $ 3.74
Contractual term to maturity |  | 2 years 3 months 29 days
Implied expected term to maturity |  | 2 years 22 days
Market volatility: |  |
Contractual interest rate |  | 8.00%
Minimum [Member] |  |
Significant assumptions utilized in valuation technique |  |
Contractual conversion rate | $ 3.17 | $ 2.74
Contractual term to maturity | 1 year 10 months 2 days |
Implied expected term to maturity | 1 year 5 months 19 days |
Market volatility: |  |
Range of volatilities | 28.80% | 55.60%
Range of equivalent volatilities | 44.40% | 78.90%
Contractual interest rate | 8.00% |
Range of equivalent market risk adjusted interest rates | 8.00% | 8.00%
Range of equivalent credit risk adjusted yields | 1.35% | 3.10%
Risk-free rates | 0.04% | 0.01%
Maximum [Member] |  |
Significant assumptions utilized in valuation technique |  |
Contractual conversion rate | $ 4.07 | $ 2.89
Contractual term to maturity | 1 year 11 months 23 days |
Implied expected term to maturity | 1 year 5 months 27 days |
Market volatility: |  |
Range of volatilities | 73.70% | 101.80%
Range of equivalent volatilities | 64.30% | 84.30%
Contractual interest rate | 9.00% |
Range of equivalent market risk adjusted interest rates | 9.10% | 8.10%
Range of equivalent credit risk adjusted yields | 1.55% | 3.50%
Risk-free rates | 0.21% | 0.25%

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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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- Definition Risk-free interest rate assumption used in valuing an instrument. + 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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