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Stock Options (Details 2)	12 Months Ended
Stock Options (Details 2)	Dec. 31, 2012	Dec. 31, 2011
Stock Options Details 2
Expected life (in years) Minimum	1 year 6 months	2 years 6 months
Expected life (in years) Maximum	6 years 6 months	6 years 6 months
Average risk-free interest rate	1.66%	1.63%
Expected volatility Minimum	108.00%	107.00%
Expected volatilty Maximum	136.00%	132.00%
Expected dividend yield	0.00%	0.00%
Forfeiture rate	3.00%	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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