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Stock Award Plans (Details 2) (Stock options, USD $)
In Millions, except Share data, unless otherwise specified |
3 Months Ended | |
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Mar. 31, 2013
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Mar. 31, 2012
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| Stock award plans | ||
| Number of homogenous groups for purposes of determining fair values of options | 3 | |
| Contractual term of the option | 10 years | |
| Weighted-average assumptions relating to options granted | ||
| Risk-free interest rate (as a percent) | 0.80% | 0.90% |
| Expected term (in years) | 5 years 6 months | 5 years 6 months |
| Dividend yield (as a percent) | 0.00% | 0.00% |
| Expected volatility (as a percent) | 73.40% | 81.70% |
| Additional disclosures | ||
| Options granted (in shares) | 2,018,691 | 2,012,105 |
| Grant-date weighted-average fair value (in dollars per share) | $ 4.02 | $ 5.46 |
| Total unrecognized compensation cost, net of estimated forfeitures | $ 9.1 | |
| Shares of common stock available for future grant | 1,188,793 | |
| Options exercised during the period (in shares) | 0 | |
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Consultants
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| Stock award plans | ||
| Contractual term of the option | 10 years | |
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- Definition
Represents the number of homogenous groups for the purpose of determining the fair values of options. No definition available.
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- Definition
The period of time, from the grant date until the time at which the share-based award expires. No definition available.
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- Definition
Aggregate unrecognized cost of option awards made to employees under a stock option plan or plans, that have yet to vest. No definition available.
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- Details
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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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- 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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- Definition
The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
Gross number of share options (or share units) granted during the period. No definition available.
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- Definition
The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Number of share options (or share units) exercised during the current period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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