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Summary Information about Options Outstanding (Detail)
9 Months Ended
Sep. 30, 2016
$ / shares
shares
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 $ 43.40
Options Number Outstanding | shares 926,335
Options Outstanding Weighted Average Remaining Contractual Life (Years) 8 years 1 month 24 days
Options Outstanding Weighted Average Exercise Price $ 7.40
Options Number Exercisable | shares 458,897
Options Exercisable Weighted Average Exercise Price $ 9.12
Range 1  
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 540,363
Options Outstanding Weighted Average Remaining Contractual Life (Years) 9 years 1 month 24 days
Options Outstanding Weighted Average Exercise Price $ 4.58
Options Number Exercisable | shares 183,894
Options Exercisable Weighted Average Exercise Price $ 4.90
Range 2  
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 320,768
Options Outstanding Weighted Average Remaining Contractual Life (Years) 7 years 26 days
Options Outstanding Weighted Average Exercise Price $ 9.59
Options Number Exercisable | shares 210,142
Options Exercisable Weighted Average Exercise Price $ 9.44
Range 3  
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 40,009
Options Outstanding Weighted Average Remaining Contractual Life (Years) 6 years 5 months 16 days
Options Outstanding Weighted Average Exercise Price $ 13.56
Options Number Exercisable | shares 39,666
Options Exercisable Weighted Average Exercise Price $ 13.55
Range 4  
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 $ 33.90
Options Number Outstanding | shares 17,411
Options Outstanding Weighted Average Remaining Contractual Life (Years) 4 years 2 months 9 days
Options Outstanding Weighted Average Exercise Price $ 25.14
Options Number Exercisable | shares 17,411
Options Exercisable Weighted Average Exercise Price $ 25.14
Range 5  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Range of Exercise Prices, lower limit 34.40
Range of Exercise Prices, upper limit $ 43.40
Options Number Outstanding | shares 7,784
Options Outstanding Weighted Average Remaining Contractual Life (Years) 4 months 24 days
Options Outstanding Weighted Average Exercise Price $ 41.33
Options Number Exercisable | shares 7,784
Options Exercisable Weighted Average Exercise Price $ 41.33