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Derivative Financial Instruments (Details 2) (Monte carlo simulations [Member], Senior Convertible Notes [Member], USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Significant assumptions utilized in valuation technique |  |
Quoted market price on valuation date | $ 3.26 | $ 2.97
Contractual conversion rate | $ 3.17 | $ 3.74
Contractual term to maturity | 1 year 29 days | 1 year 3 months 29 days
Implied expected term to maturity |  | 1 year 2 months 27 days
Minimum [Member] |  |
Significant assumptions utilized in valuation technique |  |
Implied expected term to maturity | 11 months 23 days |
Market volatility: |  |
Range of volatilities | 33.60% | 31.30%
Range of equivalent volatilities | 37.30% | 38.60%
Contractual interest rate | 8.00% | 8.00%
Range of equivalent market risk adjusted interest rates | 8.02% | 9.00%
Range of equivalent credit risk adjusted yields | 1.47% | 0.94%
Risk-free rates | 0.04% | 0.02%
Maximum [Member] |  |
Significant assumptions utilized in valuation technique |  |
Implied expected term to maturity | 11 months 27 days |
Market volatility: |  |
Range of volatilities | 72.00% | 64.03%
Range of equivalent volatilities | 47.90% | 45.00%
Contractual interest rate | 9.00% | 9.00%
Range of equivalent market risk adjusted interest rates | 9.08% | 9.10%
Range of equivalent credit risk adjusted yields | 1.13% | 1.03%
Risk-free rates | 0.14% | 0.16%

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- Definition Derivative financial instruments fair value assumptions contractual conversion rate. + References No definition available. + Details
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- Definition Derivative financial instruments fair value assumptions contractual interest rate. + References No definition available. + Details
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- Definition Derivative financial instruments fair value assumptions market risk adjusted rate range of rates. + References No definition available. + Details
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- Definition Derivative financial instruments fair value assumptions quoted market price. + References No definition available. + Details
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- Definition Derivative financial instruments fair value contractual term to maturity. + References No definition available. + 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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- 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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