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Stock Options by Range of Exercise Prices (Detail)
6 Months Ended
Dec. 31, 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 115,600
Options Outstanding, Weighted average remaining contractual life 7 years 6 months
Options Outstanding, weighted average exercise price $ 5.64
Options exercisable, Number exercisable | shares 74,500
Options exercisable, Weighted average exercise price $ 5.57
Employee 2012 Stock Option Plan [Member] | Exercise price range $ 4.88 - $ 8.15 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of exercise prices, lower limit 4.88
Range of exercise prices, upper limit $ 8.15
Options Outstanding, Number outstanding | shares 115,600
Options Outstanding, Weighted average remaining contractual life 7 years 6 months
Options Outstanding, weighted average exercise price $ 5.64
Options exercisable, Number exercisable | shares 74,500
Options exercisable, Weighted average exercise price $ 5.57
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 29,800
Options Outstanding, Weighted average remaining contractual life 7 years
Options Outstanding, weighted average exercise price $ 4.73
Options exercisable, Number exercisable | shares 20,800
Options exercisable, Weighted average exercise price $ 4.76
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 29,800
Options Outstanding, Weighted average remaining contractual life 7 years
Options Outstanding, weighted average exercise price $ 4.73
Options exercisable, Number exercisable | shares 20,800
Options exercisable, Weighted average exercise price $ 4.76
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 40,000
Options Outstanding, Weighted average remaining contractual life 9 months 18 days
Options Outstanding, weighted average exercise price $ 5.69
2002 Employee Stock Option Plan [Member] | Exercise price range $ 5.35 - $ 5.89 [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 $ 5.89
Options Outstanding, Number outstanding | shares 40,000
Options Outstanding, Weighted average remaining contractual life 9 months 18 days
Options Outstanding, weighted average exercise price $ 5.69