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Summary Information about Options Outstanding (Detail)
6 Months Ended
Jun. 30, 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 480,810
Options Outstanding Weighted Average Remaining Contractual Life (Years) 8 years 8 months 12 days
Options Outstanding Weighted Average Exercise Price $ 4.49
Options Number Exercisable | shares 228,243
Options Exercisable Weighted Average Exercise Price $ 4.62
$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 169,221
Options Outstanding Weighted Average Remaining Contractual Life (Years) 6 years 6 months
Options Outstanding Weighted Average Exercise Price $ 9.24
Options Number Exercisable | shares 141,608
Options Exercisable Weighted Average Exercise Price $ 9.16
$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) 3 years 2 months 16 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) 3 years 10 months 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 690,312
Options Outstanding Weighted Average Remaining Contractual Life (Years) 7 years 10 months 6 days
Options Outstanding Weighted Average Exercise Price $ 6.41
Options Number Exercisable | shares 410,132
Options Exercisable Weighted Average Exercise Price $ 7.44