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Stock Options - Stock options outstanding under the 2012 Employee Plan (Details)
9 Months Ended
Mar. 31, 2020
$ / 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 99,400
Options outstanding, Weighted average remaining contractual life 8 years 2 months 12 days
Options outstanding, Weighted average exercise price $ 18.41
Options exercisable, Number exercisable | shares 36,900
Options exercisable, Weighted average exercise price $ 13.27
2012 Employee Stock Option Plan [Member] | Exercise price range $4.37-$33.59 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options outstanding, Number outstanding | shares 99,400
Options outstanding, Weighted average remaining contractual life 8 years 2 months 12 days
Options outstanding, Weighted average exercise price $ 18.41
Options exercisable, Number exercisable | shares 36,900
Options exercisable, Weighted average exercise price $ 13.27
Exercise price upper limit 33.59
Exercise price lower limit $ 4.37
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 12,000
Options outstanding, Weighted average remaining contractual life 7 years 6 months
Options outstanding, Weighted average exercise price $ 10.29
Options exercisable, Number exercisable | shares 5,760
Options exercisable, Weighted average exercise price $ 8.35
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 12,000
Options outstanding, Weighted average remaining contractual life 7 years 6 months
Options outstanding, Weighted average exercise price $ 10.29
Options exercisable, Number exercisable | shares 5,760
Options exercisable, Weighted average exercise price $ 8.35
Exercise price upper limit 23.35
Exercise price lower limit $ 4.37
2018 Non-Employee Stock Option Plan  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options outstanding, Number outstanding | shares 48,400
Options outstanding, Weighted average remaining contractual life 9 years 4 months 24 days
Options outstanding, Weighted average exercise price $ 23.48
Options exercisable, Number exercisable | shares 12,240
Options exercisable, Weighted average exercise price $ 21.96
2018 Non-Employee Stock Option Plan | Exercise price range $16.20 - $30.54 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options outstanding, Number outstanding | shares 48,400
Options outstanding, Weighted average remaining contractual life 9 years 4 months 24 days
Options outstanding, Weighted average exercise price $ 23.48
Options exercisable, Number exercisable | shares 12,240
Options exercisable, Weighted average exercise price $ 21.96
Exercise price upper limit 30.54
Exercise price lower limit $ 16.20