Share-Based Payments (Detail) - Share-based compensation arrangement by share-based payment award, fair value assumptions and methodology	3 Months Ended	6 Months Ended
	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Term	6 years 219 days	7 years 109 days	6 years 219 days
Volatility	59.50%	59.20%	59.50%
Risk-free interest rate	1.50%	1.20%	1.50%