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6. Share-based Compensation (Details)	3 Months Ended
6. Share-based Compensation (Details)	Mar. 31, 2013	Mar. 31, 2012
Share-Based Compensation Details
Risk free interest rate		0.83%
Dividend yield		0.00%
Expected term (in years)	0 years	6 years
Volatility		101.00%

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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