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11 - Credit Facilities (Detail) - Schedule of valuation assumptions	3 Months Ended	12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011
Risk-free interest rate	0.42%	0.4% to 2.7 %
Expected lives (in years)	4.5 years	3.2 to 4.5 years
Dividend yield	0.00%	0.00%
Expected volatility	82.00%	82.00%
Forfeiture rate	0.00%	0.00%

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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