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Summary Information about Options Outstanding (Detail)
9 Months Ended
Sep. 30, 2018
$ / shares
shares
$4.36 - $7.20  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Range of Exercise Prices, lower limit $ 4.36
Range of Exercise Prices, upper limit $ 7.20
Options Number Outstanding | shares 472,810
Options Outstanding Weighted Average Remaining Contractual Life (Years) 7 years 6 months
Options Outstanding Weighted Average Exercise Price $ 4.47
Options Number Exercisable | shares 361,695
Options Exercisable Weighted Average Exercise Price $ 4.50
$7.50 - $11.30  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Range of Exercise Prices, lower limit 7.50
Range of Exercise Prices, upper limit $ 11.30
Options Number Outstanding | shares 127,415
Options Outstanding Weighted Average Remaining Contractual Life (Years) 5 years 4 months 20 days
Options Outstanding Weighted Average Exercise Price $ 9.42
Options Number Exercisable | shares 127,415
Options Exercisable Weighted Average Exercise Price $ 9.42
$12.00 - $19.70  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Range of Exercise Prices, lower limit 12.00
Range of Exercise Prices, upper limit $ 19.70
Options Number Outstanding | shares 17,396
Options Outstanding Weighted Average Remaining Contractual Life (Years) 3 years 8 months 23 days
Options Outstanding Weighted Average Exercise Price $ 13.66
Options Number Exercisable | shares 17,396
Options Exercisable Weighted Average Exercise Price $ 13.66
$21.70 - $24.20  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Range of Exercise Prices, lower limit 21.70
Range of Exercise Prices, upper limit $ 24.20
Options Number Outstanding | shares 4,350
Options Outstanding Weighted Average Remaining Contractual Life (Years) 2 years 11 months 4 days
Options Outstanding Weighted Average Exercise Price $ 23.27
Options Number Exercisable | shares 4,350
Options Exercisable Weighted Average Exercise Price $ 23.27
$4.36 - $24.20  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Range of Exercise Prices, lower limit 4.36
Range of Exercise Prices, upper limit $ 24.20
Options Number Outstanding | shares 621,971
Options Outstanding Weighted Average Remaining Contractual Life (Years) 6 years 11 months 4 days
Options Outstanding Weighted Average Exercise Price $ 5.87
Options Number Exercisable | shares 510,856
Options Exercisable Weighted Average Exercise Price $ 6.20