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Stockholders' Equity (Details)	6 Months Ended
Stockholders' Equity (Details)	Jun. 30, 2012
Weighted average for key assumptions used in determining the fair value of options granted
Weighted average expected life in years	6 years
Dividend yield	0.00%
Maximum [Member]
Weighted average for key assumptions used in determining the fair value of options granted [Abstract]
Expected price volatility	82.97%
Risk-free interest rate	1.02%
Minimum [Member]
Weighted average for key assumptions used in determining the fair value of options granted [Abstract]
Expected price volatility	82.71%
Risk-free interest rate	0.76%

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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