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Summary Information about Options Outstanding (Detail)
12 Months Ended
Dec. 31, 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 832,941
Options Outstanding Weighted Average Remaining Contractual Life (Years) 8 years 2 months 23 days
Options Outstanding Weighted Average Exercise Price $ 7.11
Options Number Exercisable | shares 429,816
Options Exercisable Weighted Average Exercise Price $ 8.58
$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 530,810
Options Outstanding Weighted Average Remaining Contractual Life (Years) 9 years
Options Outstanding Weighted Average Exercise Price $ 4.55
Options Number Exercisable | shares 207,619
Options Exercisable Weighted Average Exercise Price $ 4.78
$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 254,471
Options Outstanding Weighted Average Remaining Contractual Life (Years) 7 years 3 months
Options Outstanding Weighted Average Exercise Price $ 9.80
Options Number Exercisable | shares 174,537
Options Exercisable Weighted Average Exercise Price $ 9.67
$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 3 months 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 - $33.90  
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 17,541
Options Outstanding Weighted Average Remaining Contractual Life (Years) 3 years 2 months 23 days
Options Outstanding Weighted Average Exercise Price $ 29.30
Options Number Exercisable | shares 17,541
Options Exercisable Weighted Average Exercise Price $ 29.30
$34.40 - $43.40  
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 2,729
Options Outstanding Weighted Average Remaining Contractual Life (Years) 2 months 19 days
Options Outstanding Weighted Average Exercise Price $ 43.40
Options Number Exercisable | shares 2,729
Options Exercisable Weighted Average Exercise Price $ 43.40