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Summary of Weighted Average Assumptions and Fair Value of Options (Detail)	1 Months Ended
	Jun. 28, 2012 Board of Directors	Jun. 06, 2011 Board of Directors	Dec. 01, 2012 Executive Officer	Jun. 06, 2011 Executive Officer
Share based Compensation Arrangement Assumptions Used to Estimate Fair Values of Share Options Granted [Line Items]
Expected volatility	136.00%	164.60%	130.21%	164.60%
Risk-free interest rate	0.40%	0.74%	0.61%	1.60%
Expected life	3 years	3 years	5 years	5 years
Dividend yield	0.00%	0.00%	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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