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Stock Options by Range of Exercise Prices (Detail)
3 Months Ended
Sep. 30, 2016
$ / shares
shares
Employee 2012 Stock Option Plan [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding, Number outstanding | shares 112,500
Options Outstanding, Weighted average remaining contractual life 7 years 8 months 12 days
Options Outstanding, weighted average exercise price $ 5.54
Options exercisable, Number exercisable | shares 60,700
Options exercisable, Weighted average exercise price $ 5.55
Employee 2012 Stock Option Plan [Member] | Exercise price range $ 4.29 - $ 6.31 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices, lower limit 4.29
Range of exercise prices, upper limit $ 6.31
Options Outstanding, Number outstanding | shares 112,500
Options Outstanding, Weighted average remaining contractual life 7 years 8 months 12 days
Options Outstanding, weighted average exercise price $ 5.54
Options exercisable, Number exercisable | shares 60,700
Options exercisable, Weighted average exercise price $ 5.55
NonEmployee 2012 Stock Option Plan [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding, Number outstanding | shares 35,000
Options Outstanding, Weighted average remaining contractual life 7 years 3 months 18 days
Options Outstanding, weighted average exercise price $ 4.73
Options exercisable, Number exercisable | shares 24,000
Options exercisable, Weighted average exercise price $ 4.80
NonEmployee 2012 Stock Option Plan [Member] | Exercise price range $4.37 - $4.88 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices, lower limit 4.37
Range of exercise prices, upper limit $ 4.88
Options Outstanding, Number outstanding | shares 35,000
Options Outstanding, Weighted average remaining contractual life 7 years 3 months 18 days
Options Outstanding, weighted average exercise price $ 4.73
Options exercisable, Number exercisable | shares 24,000
Options exercisable, Weighted average exercise price $ 4.8
2002 Employee Stock Option Plan [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding, Number outstanding | shares 102,500
Options Outstanding, Weighted average remaining contractual life 4 months 24 days
Options Outstanding, weighted average exercise price $ 6.04
2002 Employee Stock Option Plan [Member] | Exercise price range $ 5.35 - $ 6.62 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices, lower limit 5.35
Range of exercise prices, upper limit $ 6.62
Options Outstanding, Number outstanding | shares 102,500
Options Outstanding, Weighted average remaining contractual life 4 months 24 days
Options Outstanding, weighted average exercise price $ 6.04