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Summary Information about Options Outstanding (Detail)
9 Months Ended
Sep. 30, 2015
$ / 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 801,269
Options Outstanding Weighted Average Remaining Contractual Life (Years) 6 years 8 months 16 days
Options Outstanding Weighted Average Exercise Price $ 11.42
Options Number Exercisable | shares 462,747
Options Exercisable Weighted Average Exercise Price $ 13.18
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 160,364
Options Outstanding Weighted Average Remaining Contractual Life (Years) 7 years 9 months
Options Outstanding Weighted Average Exercise Price $ 6.38
Options Number Exercisable | shares 91,834
Options Exercisable Weighted Average Exercise Price $ 6.68
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 247,146
Options Outstanding Weighted Average Remaining Contractual Life (Years) 7 years 6 months 26 days
Options Outstanding Weighted Average Exercise Price $ 8.80
Options Number Exercisable | shares 92,462
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 $ 10.99
Options Number Outstanding | shares 168,476
Options Outstanding Weighted Average Remaining Contractual Life (Years) 8 years 7 months 10 days
Options Outstanding Weighted Average Exercise Price $ 10.85
Options Number Exercisable | shares 58,010
Options Exercisable Weighted Average Exercise Price $ 10.71
Range 4  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Range of Exercise Prices, lower limit 11.00
Range of Exercise Prices, upper limit $ 24.00
Options Number Outstanding | shares 165,206
Options Outstanding Weighted Average Remaining Contractual Life (Years) 4 years 2 months 12 days
Options Outstanding Weighted Average Exercise Price $ 14.20
Options Number Exercisable | shares 160,364
Options Exercisable Weighted Average Exercise Price $ 14.20
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 60,077
Options Outstanding Weighted Average Remaining Contractual Life (Years) 2 years 7 days
Options Outstanding Weighted Average Exercise Price $ 29.56
Options Number Exercisable | shares 60,077
Options Exercisable Weighted Average Exercise Price $ 29.56