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Stock-based Compensation Plans and Awards (Schedule of Fair Value Calculation Assumptions) (Details)
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3 Months Ended | |
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Mar. 31, 2014
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Mar. 31, 2013
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Dividend yield | ||
| Volatility | 66.00% | 65.00% |
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Minimum [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Risk-free interest rate | 1.74% | 0.83% |
| Expected term | 5 years | 5 years |
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Maximum [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Risk-free interest rate | 2.68% | 1.13% |
| Expected term | 10 years | 10 years |
| X | ||||||||||
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- Definition
The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The risk-free interest rate assumption that is used in valuing an option on its own shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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