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Summary of Stock Option Activity (Detail)
3 Months Ended
Sep. 30, 2019
USD ($)
$ / shares
shares
Number of Options  
Beginning Balance | shares 8,356,961
Granted | shares 3,083,333
Exercised | shares (46,667)
Forfeited / Cancelled | shares (49,186)
Expired | shares (527,080)
Ending balance | shares 10,817,361
Vested and exercisable at end of period | shares 4,114,253
Weighted- Average Exercise Price  
Beginning Balance | $ / shares $ 3.20
Granted | $ / shares 2.50
Exercised | $ / shares 1.54
Forfeited / Cancelled | $ / shares 1.81
Expired | $ / shares 6.89
Ending balance | $ / shares 2.83
Vested and exercisable at end of period | $ / shares $ 2.52
Weighted Average Remaining Contractual Term (in years)  
Outstanding at end of period 8 years 6 months
Vested and exercisable at end of period 7 years 3 months 18 days
Aggregate Intrinsic Value  
Outstanding at end of period | $ $ 501,818
Vested and exercisable at end of period | $ $ 428,455