Debt - Summary of Total Interest Expense Recognized (Detail) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Debt Instrument [Line Items]
Amortization of debt discount and debt issuance costs including initial purchaser discount	$ 5,170	$ 3,570
0.25% Convertible Senior Note Due 2022
Debt Instrument [Line Items]
Debt instrument, interest rate	0.25%	0.25%
0.25% contractual coupon	$ 220	$ 220
Amortization of debt discount and debt issuance costs including initial purchaser discount	3,407	3,255
Interest expense	$ 3,627	$ 3,475