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Summary of Stock Option Activity (Detail)
3 Months Ended
Sep. 30, 2021
USD ($)
$ / shares
shares
Number of Options  
Beginning Balance | shares 16,668,542
Granted | shares 5,051,400
Forfeited / Cancelled | shares (1,078,419)
Ending balance | shares 20,641,523
Vested and exercisable at end of period | shares 9,748,144
Weighted- Average Exercise Price  
Beginning Balance | $ / shares $ 3.01
Granted | $ / shares 2.93
Forfeited / Cancelled | $ / shares 3.10
Ending balance | $ / shares 2.98
Vested and exercisable at end of period | $ / shares $ 2.86
Weighted Average Remaining Contractual Term (in years)  
Outstanding at end of period 7 years 10 months 24 days
Vested and exercisable at end of period 6 years 7 months 6 days
Aggregate Intrinsic Value  
Outstanding at end of period | $ $ 4,131,984
Vested and exercisable at end of period | $ $ 3,610,815