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Summary Information about Options Outstanding (Detail)
3 Months Ended
Mar. 31, 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 518,310
Options Outstanding Weighted Average Remaining Contractual Life (Years) 8 years 3 months 26 days
Options Outstanding Weighted Average Exercise Price $ 4.54
Options Number Exercisable | shares 236,678
Options Exercisable Weighted Average Exercise Price $ 4.74
$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 222,346
Options Outstanding Weighted Average Remaining Contractual Life (Years) 5 years 2 months 27 days
Options Outstanding Weighted Average Exercise Price $ 9.64
Options Number Exercisable | shares 185,389
Options Exercisable Weighted Average Exercise Price $ 9.66
$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 27,390
Options Outstanding Weighted Average Remaining Contractual Life (Years) 6 years 15 days
Options Outstanding Weighted Average Exercise Price $ 13.66
Options Number Exercisable | shares 27,390
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) 4 years 1 month 10 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 780,937
Options Outstanding Weighted Average Remaining Contractual Life (Years) 7 years 3 months 15 days
Options Outstanding Weighted Average Exercise Price $ 6.66
Options Number Exercisable | shares 462,348
Options Exercisable Weighted Average Exercise Price $ 7.82