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Share-Based Compensation (Details1)	3 Months Ended
Share-Based Compensation (Details1)	Mar. 31, 2013
Fair value of stock options granted
Expected volatility (%)	74.00%
Expected life (years)	6 years 29 days
Risk free rate (%)	1.08%
Expected dividend yield (%)	0.00%
Estimated forfeitures (%)	10.00%

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.

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