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Summary of Stock Option Activity (Detail)
9 Months Ended
Mar. 31, 2016
USD ($)
$ / shares
shares
Number of Options  
Beginning Balance | shares 1,614,317
Granted | shares 1,546,625
Forfeited / Cancelled | shares (262,392)
Expired | shares (26,867)
Ending balance | shares 2,871,683
Vested and exercisable at end of period | shares 1,188,713
Weighted- Average Exercise Price  
Beginning Balance | $ / shares $ 7.07
Granted | $ / shares 1.59
Forfeited / Cancelled | $ / shares 5.10
Expired | $ / shares 5.53
Ending balance | $ / shares 4.32
Vested and exercisable at end of period | $ / shares $ 5.78
Weighted Average Remaining Contractual Term (in years)  
Outstanding at end of period 6 years 2 months 12 days
Vested and exercisable at end of period 4 years 3 months 18 days
Aggregate Intrinsic Value  
Outstanding at end of period | $ $ 8,607
Vested and exercisable at end of period | $ $ 0