The Company - Revenue Associated With The Following license agreements (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Recognized Revenue Associated with The Following License Agreements [Line Items]
Revenues	$ 25,504	$ 1,244	$ 1,008	$ 1,157	$ 1,129	$ 1,249	$ 2,049	$ 488	$ 28,913	$ 4,915	$ 1,622
KKC Agreements [Member]
Recognized Revenue Associated with The Following License Agreements [Line Items]
Revenues									27,543	2,557
Helsinn License Agreement [Member]
Recognized Revenue Associated with The Following License Agreements [Line Items]
Revenues									1,370	2,358	1,622
License transferred at a point in time [Member]
Recognized Revenue Associated with The Following License Agreements [Line Items]
Revenues									20,988	879
Services performed over time [Member]
Recognized Revenue Associated with The Following License Agreements [Line Items]
Revenues									4,860	$ 4,036	$ 1,622
Cumulative catch-up adjustment [Member]
Recognized Revenue Associated with The Following License Agreements [Line Items]
Revenues									$ 3,065