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Summary of Stock Option (Detail) - USD ($)
 6 Months Ended
Jun. 30, 2019
Options  
Beginning balance | shares 1,548,825
Grants | shares 296,500
Exercises | shares (75,000)
Cancellations | shares (6,750)
Expirations | shares (68,125)
Ending balance | shares 1,695,450
Options exercisable at End of Period | shares 1,212,172
Weighted-average exercise price  
Beginning balance | $ / shares $ 13.87
Grants | $ / shares 9.21
Exercises | $ / shares 4.28
Cancellations | $ / shares 13.34
Expirations | $ / shares 15.57
Ending balance | $ / shares 13.41
Options exercisable at End of Period | $ / shares $ 14.27
Weighted-average remaining contractual life (years)  
Options outstanding, Ending balance 4 years 10 months 24 days
Options exercisable, Ending balance 3 years 1 month 6 days
Aggregate intrinsic value  
Options outstanding, end of period | $ $ 87,425
Options exercisable, end of period | $ $ 87,425