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Stock Options - Stock options outstanding under the 2012 Employee Plan (Details)
3 Months Ended
Sep. 30, 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 117,840
Options outstanding, Weighted average remaining contractual life 8 years 1 month 6 days
Options outstanding, Weighted average exercise price | $ / shares $ 18.84
Options exercisable, Number exercisable | shares 37,400
Options exercisable, Weighted average exercise price | $ / shares $ 13.73
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 117,840
Options outstanding, Weighted average remaining contractual life 8 years 1 month 6 days
Options outstanding, Weighted average exercise price | $ / shares $ 18.84
Options exercisable, Number exercisable | shares 37,400
Options exercisable, Weighted average exercise price | $ / shares $ 13.73
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
Options outstanding, Weighted average exercise price | $ / shares $ 10.29
Options exercisable, Number exercisable | shares 5,760
Options exercisable, Weighted average exercise price | $ / shares $ 8.35
2012 Non-Employee Stock Option Plan [Member] | Exercise price range $4.37 - $23.35 [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
Options outstanding, Weighted average exercise price | $ / shares $ 10.29
Options exercisable, Number exercisable | shares 5,760
Options exercisable, Weighted average exercise price | $ / shares $ 8.35
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 8 years 10 months 24 days
Options outstanding, Weighted average exercise price | $ / shares $ 23.48
Options exercisable, Number exercisable | shares 12,240
Options exercisable, Weighted average exercise price | $ / shares $ 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 8 years 10 months 24 days
Options outstanding, Weighted average exercise price | $ / shares $ 23.48
Options exercisable, Number exercisable | shares 12,240
Options exercisable, Weighted average exercise price | $ / shares $ 21.96
2020 Non-Employee Stock Option Plan  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options outstanding, Number outstanding | shares 5,000
Options outstanding, Weighted average remaining contractual life 9 years 10 months 24 days
Options outstanding, Weighted average exercise price | $ / shares $ 22.80
Options exercisable, Number exercisable | shares 1,000
Options exercisable, Weighted average exercise price | $ / shares $ 22.80
2020 Non-Employee Stock Option Plan | Exercise price range $22.80 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options outstanding, Number outstanding | shares 5,000
Options outstanding, Weighted average remaining contractual life 9 years 10 months 24 days
Options outstanding, Weighted average exercise price | $ / shares $ 22.80
Options exercisable, Number exercisable | shares 1,000
Options exercisable, Weighted average exercise price | $ / shares $ 22.80