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Summary Information about Options Outstanding (Detail)
9 Months Ended
Sep. 30, 2017
$ / 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 479,810
Options Outstanding Weighted Average Remaining Contractual Life (Years) 8 years 5 months 20 days
Options Outstanding Weighted Average Exercise Price $ 4.48
Options Number Exercisable | shares 256,300
Options Exercisable Weighted Average Exercise Price $ 4.58
$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 165,388
Options Outstanding Weighted Average Remaining Contractual Life (Years) 6 years 3 months 14 days
Options Outstanding Weighted Average Exercise Price $ 9.26
Options Number Exercisable | shares 146,119
Options Exercisable Weighted Average Exercise Price $ 9.20
$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) 4 years 9 months
Options Outstanding Weighted Average Exercise Price $ 13.66
Options Number Exercisable | shares 17,396
Options Exercisable Weighted Average Exercise Price $ 13.66
$21.70 - $29.20  
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 $ 29.20
Options Number Outstanding | shares 12,891
Options Outstanding Weighted Average Remaining Contractual Life (Years) 3 years 7 months 2 days
Options Outstanding Weighted Average Exercise Price $ 25.37
Options Number Exercisable | shares 12,891
Options Exercisable Weighted Average Exercise Price $ 25.37
$4.36 - $29.20  
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 $ 29.20
Options Number Outstanding | shares 675,485
Options Outstanding Weighted Average Remaining Contractual Life (Years) 7 years 9 months
Options Outstanding Weighted Average Exercise Price $ 6.29
Options Number Exercisable | shares 432,706
Options Exercisable Weighted Average Exercise Price $ 7.13