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Summary of Stock Option Activity (Detail)
6 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Number of Options  
Beginning Balance | shares 4,259,083
Granted | shares 1,692,000
Exercised | shares (113,391)
Forfeited / Cancelled | shares (252,603)
Expired | shares (122,343)
Ending balance | shares 5,462,746
Vested and exercisable at end of period | shares 2,758,956
Weighted- Average Exercise Price  
Beginning Balance | $ / shares $ 3.21
Granted | $ / shares 2.82
Exercised | $ / shares 1.66
Forfeited / Cancelled | $ / shares 2.44
Expired | $ / shares 5.26
Ending balance | $ / shares 3.11
Vested and exercisable at end of period | $ / shares $ 3.84
Weighted Average Remaining Contractual Term (in years)  
Outstanding at end of period 7 years 1 month 6 days
Vested and exercisable at end of period 5 years 3 months 19 days
Aggregate Intrinsic Value  
Outstanding at end of period | $ $ 1,680,120
Vested and exercisable at end of period | $ $ 946,930