Share-Based Payments (Detail) - Share-based compensation arrangement by share-based payment award, fair value assumptions and methodology	3 Months Ended		9 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Term	7 years 109 days	6 years 219 days	7 years 109 days	6 years 219 days
Volatility	59.20%	59.50%	59.20%	59.50%
Minimum [Member]
Risk-free interest rate	1.40%	1.50%	1.20%	1.50%
Maximum [Member]
Risk-free interest rate			1.40%