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Share-Based Payment Awards - Stock Option Activity Under Company's Equity Incentive Plan (Detail) - Equity Incentive Plans [Member]
$ / shares in Units, $ in Thousands
3 Months Ended
Sep. 30, 2018
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Aggregate Intrinsic Value, Outstanding at September 30, 2018 | $ $ 6,203
Aggregate Intrinsic Value, Exercisable at September 30, 2018 | $ $ 1,747
Weighted Average Remaining Contractual Life, Outstanding at September 30, 2018 7 years 3 months 3 days
Weighted Average Remaining Contractual Life, Exercisable at September 30, 2018 5 years 2 months 12 days
Weighted Average Exercise Price Outstanding, Beginning balance | $ / shares $ 2.79
Weighted Average Exercise Price, Granted | $ / shares 2.31
Weighted Average Exercise Price, Forfeited | $ / shares 2.76
Weighted Average Exercise Price, Expired | $ / shares 2.85
Weighted Average Exercise Price Outstanding, Ending balance | $ / shares 2.76
Weighted Average Exercise Price, Exercisable at September 30,2018 | $ / shares $ 3.34
Number of Options Outstanding, Beginning balance | shares 6,460,244
Number of Options, Granted | shares 166,575
Number of Options, Forfeited | shares (10,600)
Number of Options, Exercised | shares (156,750)
Number of Options Outstanding, Ending balance | shares 6,459,469
Number of Options, Exercisable at September 30 , 2018 | shares 3,151,142