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Summary of Stock Option Activity (Detail)
12 Months Ended
Jun. 30, 2020
USD ($)
$ / shares
shares
Number of Options  
Beginning Balance | shares 8,356,961
Granted | shares 3,733,333
Exercised | shares (153,679)
Forfeited / Cancelled | shares (125,749)
Expired | shares (557,890)
Ending balance | shares 11,252,976
Vested and exercisable at end of period | shares 5,475,069
Weighted- Average Exercise Price  
Beginning Balance | $ / shares $ 3.20
Granted | $ / shares 2.50
Exercised | $ / shares 1.77
Forfeited / Cancelled | $ / shares 2.45
Expired | $ / shares 6.89
Ending balance | $ / shares 2.81
Vested and exercisable at end of period | $ / shares $ 2.66
Weighted Average Remaining Contractual Term (in years)  
Outstanding at end of period 7 years 9 months 18 days
Vested and exercisable at end of period 7 years
Aggregate Intrinsic Value  
Outstanding at end of period | $ $ 15,290,655
Vested and exercisable at end of period | $ $ 8,330,387