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Stock Options (Details 2)	3 Months Ended
Stock Options (Details 2)	Mar. 31, 2013	Mar. 31, 2012
Stock Options Details 2
Expected life (in years) Minimum		6 years 6 months
Expected life (in years) Maximum		6 years 6 months
Average risk-free interest rate		1.66%
Expected volatility Minimum		108.00%
Expected volatilty Maximum		108.00%
Expected dividend yield		0.00%
Forfeiture rate		3.00%

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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