Quarterly Financial Information (Detail) - USD ($) $ / shares in Units, $ 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
Quarterly Financial Information [Line Items]
Total revenues	$ 25,504		$ 1,244		$ 1,008		$ 1,157		$ 1,129		$ 1,249		$ 2,049		$ 488		$ 28,913		$ 4,915		$ 1,622
Net income (loss)	$ (18,476)	[1]	$ (4,329)	[1]	$ (20,217)	[1]	$ (2,994)	[1]	$ 3,052	[1]	$ (17,354)	[1]	$ 12,025	[1]	$ (14,542)	[1]	$ (46,016)	[1]	$ (16,819)	[1]	$ (40,068)
Basic income (loss) per share	$ (0.17)		$ (0.04)		$ (0.26)		$ (0.04)		$ 0.04		$ (0.24)		$ 0.17		$ (0.21)		$ (0.51)		$ (0.24)		$ (0.97)
Diluted loss per share	$ (0.17)		$ (0.04)		$ (0.26)		$ (0.04)		$ (0.15)		$ (0.24)		$ (0.15)		$ (0.21)		$ (0.51)		$ (0.75)		$ (0.97)

[1] We have experienced large changes in our net loss which relates to the change in fair value of the warrant liability for the years ended June 30, 2020 and 2019. Refer to Note 1 for further discussion.