Quarterly Financial Information - Summary of Quarterly 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
Quarterly Financial Information Disclosure [Abstract]
Revenue			$ 2,453		$ 406	$ 21,318	$ 5,934	$ 14,034	$ 2,453	$ 41,692
Income (loss) from operations	$ (14,580)	$ (11,442)	(8,930)	$ (11,990)	(11,440)	11,005	(4,671)	756	(46,942)	(4,350)
Net income (loss)	$ (14,503)	$ (11,189)	$ (8,623)	$ (11,577)	$ (10,514)	$ 11,489	$ (4,181)	$ 1,200	$ (45,892)	$ (2,006)
Net income (loss) per common share, basic	$ (0.56)	$ (0.50)	$ (0.47)	$ (0.64)	$ (0.58)	$ 0.63	$ (0.23)	$ 0.07	$ (2.17)	$ (0.11)
Net income (loss) per common share, diluted	$ (0.56)	$ (0.50)	$ (0.47)	$ (0.64)	$ (0.58)	$ 0.63	$ (0.23)	$ 0.07	$ (2.17)	$ (0.11)