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Summary of Stock Option Activity (Detail)
6 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
shares
Number of Options  
Beginning Balance | shares 2,827,172
Granted | shares 1,527,083
Forfeited / Cancelled | shares (33,333)
Expired | shares (39,900)
Ending balance | shares 4,281,022
Vested and exercisable at end of period | shares 1,773,019
Weighted- Average Exercise Price  
Beginning Balance | $ / shares $ 4.29
Granted | $ / shares 1.37
Forfeited / Cancelled | $ / shares 1.36
Expired | $ / shares 9.98
Ending balance | $ / shares 3.22
Vested and exercisable at end of period | $ / shares $ 4.78
Weighted Average Remaining Contractual Term (in years)  
Outstanding at end of period 7 years
Vested and exercisable at end of period 4 years 9 months 18 days
Aggregate Intrinsic Value  
Outstanding at end of period | $ $ 137,680
Vested and exercisable at end of period | $ $ 8,534