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Summary Information about Options Outstanding (Detail)
3 Months Ended
Mar. 31, 2016
$ / shares
shares
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Range of Exercise Prices, lower limit $ 5.20
Range of Exercise Prices, upper limit $ 43.40
Options Number Outstanding | shares 759,914
Options Outstanding Weighted Average Remaining Contractual Life (Years) 6 years 3 months 22 days
Options Outstanding Weighted Average Exercise Price $ 11.53
Options Number Exercisable | shares 515,291
Options Exercisable Weighted Average Exercise Price $ 12.70
Range 1  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Range of Exercise Prices, lower limit 5.20
Range of Exercise Prices, upper limit $ 8.40
Options Number Outstanding | shares 156,411
Options Outstanding Weighted Average Remaining Contractual Life (Years) 7 years 4 months 21 days
Options Outstanding Weighted Average Exercise Price $ 6.41
Options Number Exercisable | shares 107,477
Options Exercisable Weighted Average Exercise Price $ 6.63
Range 2  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Range of Exercise Prices, lower limit 8.41
Range of Exercise Prices, upper limit $ 8.80
Options Number Outstanding | shares 213,146
Options Outstanding Weighted Average Remaining Contractual Life (Years) 7 years 8 months 5 days
Options Outstanding Weighted Average Exercise Price $ 8.80
Options Number Exercisable | shares 110,146
Options Exercisable Weighted Average Exercise Price $ 8.80
Range 3  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Range of Exercise Prices, lower limit 8.81
Range of Exercise Prices, upper limit $ 11.30
Options Number Outstanding | shares 170,076
Options Outstanding Weighted Average Remaining Contractual Life (Years) 8 years 1 month 17 days
Options Outstanding Weighted Average Exercise Price $ 10.86
Options Number Exercisable | shares 79,355
Options Exercisable Weighted Average Exercise Price $ 10.77
Range 4  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Range of Exercise Prices, lower limit 11.31
Range of Exercise Prices, upper limit $ 24.00
Options Number Outstanding | shares 161,319
Options Outstanding Weighted Average Remaining Contractual Life (Years) 3 years 3 months 26 days
Options Outstanding Weighted Average Exercise Price $ 14.21
Options Number Exercisable | shares 159,351
Options Exercisable Weighted Average Exercise Price $ 14.21
Range 5  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Range of Exercise Prices, lower limit 24.01
Range of Exercise Prices, upper limit $ 43.40
Options Number Outstanding | shares 58,962
Options Outstanding Weighted Average Remaining Contractual Life (Years) 1 year 5 months 12 days
Options Outstanding Weighted Average Exercise Price $ 29.57
Options Number Exercisable | shares 58,962
Options Exercisable Weighted Average Exercise Price $ 29.57