Non-vested Stock Option Activity (Detail) - $ / shares	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Number of options
Beginning balance	5,777,907
Granted	6,201,300
Forfeited	(587,890)
Vested	(3,139,739)
Ending balance	8,251,578	5,777,907
Weighted average grant date fair value
Beginning balance	$ 2.05
Granted	2.30	$ 1.64	$ 2.78
Forfeited	2.31
Vested	2.04
Ending balance	$ 2.23	$ 2.05