Convertible Senior Notes - Total Interest Expense Related to Convertible Notes (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Debt Disclosure [Abstract]
Contractual interest expense (cash)	$ 712	$ 712
Amortization of debt discount (non-cash)	2,669	2,486
Amortization of debt issue costs (non-cash)	296	296
Total interest expense	$ 3,677	$ 3,494
Effective interest rate of the liability component	7.13%	6.74%