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Summary of Stock Option Activity (Detail)
9 Months Ended
Mar. 31, 2017
USD ($)
$ / shares
shares
Number of Options  
Beginning Balance | shares 2,827,172
Granted | shares 1,527,083
Forfeited / Cancelled | shares (33,333)
Expired | shares (54,630)
Ending balance | shares 4,266,292
Vested and exercisable at end of period | shares 2,017,037
Weighted- Average Exercise Price  
Beginning Balance | $ / shares $ 4.29
Granted | $ / shares 1.37
Forfeited / Cancelled | $ / shares 1.36
Expired | $ / shares 9.15
Ending balance | $ / shares 3.21
Vested and exercisable at end of period | $ / shares $ 4.54
Weighted Average Remaining Contractual Term (in years)  
Outstanding at end of period 6 years 8 months 12 days
Vested and exercisable at end of period 4 years 10 months 24 days
Aggregate Intrinsic Value  
Outstanding at end of period | $ $ 467,597
Vested and exercisable at end of period | $ $ 81,367