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Stock Options by Range of Exercise Prices (Detail)
9 Months Ended
Mar. 31, 2019
$ / 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 68,000
Options outstanding, Weighted average remaining contractual life 7 years 8 months 12 days
Options outstanding, Weighted average exercise price | $ / shares $ 10.11
Options exercisable, Number exercisable | shares 33,300
Options exercisable, Weighted average exercise price | $ / shares $ 7.84
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 68,000
Options outstanding, Weighted average remaining contractual life 7 years 8 months 12 days
Options outstanding, Weighted average exercise price | $ / shares $ 10.11
Options exercisable, Number exercisable | shares 33,300
Options exercisable, Weighted average exercise price | $ / shares $ 7.84
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 13,200
Options outstanding, Weighted average remaining contractual life 8 years 2 months 12 days
Options outstanding, Weighted average exercise price | $ / shares $ 8.15
Options exercisable, Number exercisable | shares 4,200
Options exercisable, Weighted average exercise price | $ / shares $ 6.97
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 13,200
Options outstanding, Weighted average remaining contractual life 8 years 2 months 12 days
Options outstanding, Weighted average exercise price | $ / shares $ 8.15
Options exercisable, Number exercisable | shares 4,200
Options exercisable, Weighted average exercise price | $ / shares $ 6.97
2018 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 20,000
Options outstanding, Weighted average remaining contractual life 9 years 8 months 12 days
Options outstanding, Weighted average exercise price | $ / shares $ 16.20
Options exercisable, Number exercisable | shares 4,000
Options exercisable, Weighted average exercise price | $ / shares $ 16.20
2018 Non-Employee Stock Option Plan [Member] | Excercise price range $16.20 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options outstanding, Number outstanding | shares 20,000
Options outstanding, Weighted average remaining contractual life 9 years 8 months 12 days
Options outstanding, Weighted average exercise price | $ / shares $ 16.20
Options exercisable, Number exercisable | shares 4,000
Options exercisable, Weighted average exercise price | $ / shares $ 16.20