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Share-Based Compensation - Summary of Estimated Fair Value of Share-Based Compensation Using Black-Scholes Option Pricing Model and Assumptions (Detail)	12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk Free Interest Rate	1.50%	1.80%	2.50%
Dividend Yield	0.00%	0.00%	0.00%
Volatility Factor	114.00%	107.00%	103.00%
Weighted Average Expected Option Life (Months)	48 months	48 months	48 months

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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