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Stock Options by Range of Exercise Prices (Detail)
3 Months Ended
Sep. 30, 2018
$ / shares
shares
2012 Employee Stock Option Plan [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options outstanding, Number outstanding | shares 58,700
Options outstanding, Weighted average remaining contractual life 7 years 4 months 24 days
Options outstanding, Weighted average exercise price | $ / shares $ 7.68
Options exercisable, Number exercisable | shares 27,900
Options exercisable, Weighted average exercise price | $ / shares $ 6.57
2012 Employee Stock Option Plan [Member] | Exercise price range $ 4.29 - $ 15.30 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options outstanding, Number outstanding | shares 58,700
Options outstanding, Weighted average remaining contractual life 7 years 4 months 24 days
Options outstanding, Weighted average exercise price | $ / shares $ 7.68
Options exercisable, Number exercisable | shares 27,900
Options exercisable, Weighted average exercise price | $ / shares $ 6.57
2012 Non-Employee Stock Option Plan [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options outstanding, Number outstanding | shares 27,800
Options outstanding, Weighted average remaining contractual life 7 years 4 months 24 days
Options outstanding, Weighted average exercise price | $ / shares $ 6.85
Options exercisable, Number exercisable | shares 13,800
Options exercisable, Weighted average exercise price | $ / shares $ 5.61
2012 Non-Employee Stock Option Plan [Member] | Exercise price range $4.37 - $8.70 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options outstanding, Number outstanding | shares 27,800
Options outstanding, Weighted average remaining contractual life 7 years 4 months 24 days
Options outstanding, Weighted average exercise price | $ / shares $ 6.85
Options exercisable, Number exercisable | shares 13,800
Options exercisable, Weighted average exercise price | $ / shares $ 5.61