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Stock Options by Range of Exercise Prices (Detail)
6 Months Ended
Dec. 31, 2017
$ / 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 88,100
Options outstanding, Weighted average remaining contractual life 7 years 3 months 18 days
Options outstanding, Weighted average exercise price | $ / shares $ 6.53
Options exercisable, Number exercisable | shares 60,300
Options exercisable, Weighted average exercise price | $ / shares $ 6.03
2012 Employee Stock Option Plan [Member] | Exercise price range $ 4.29 - $ 9.63 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options outstanding, Number outstanding | shares 88,100
Options outstanding, Weighted average remaining contractual life 7 years 3 months 18 days
Options outstanding, Weighted average exercise price | $ / shares $ 6.53
Options exercisable, Number exercisable | shares 60,300
Options exercisable, Weighted average exercise price | $ / shares $ 6.03
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 29,200
Options outstanding, Weighted average remaining contractual life 8 years 1 month 6 days
Options outstanding, Weighted average exercise price | $ / shares $ 6.75
Options exercisable, Number exercisable | shares 15,200
Options exercisable, Weighted average exercise price | $ / shares $ 5.53
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 29,200
Options outstanding, Weighted average remaining contractual life 8 years 1 month 6 days
Options outstanding, Weighted average exercise price | $ / shares $ 6.75
Options exercisable, Number exercisable | shares 15,200
Options exercisable, Weighted average exercise price | $ / shares $ 5.53