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Summary Information about Options Outstanding (Detail)
3 Months Ended
Mar. 31, 2018
$ / 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 479,810
Options Outstanding Weighted Average Remaining Contractual Life (Years) 7 years 11 months 8 days
Options Outstanding Weighted Average Exercise Price $ 4.48
Options Number Exercisable | shares 313,138
Options Exercisable Weighted Average Exercise Price $ 4.55
$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 157,311
Options Outstanding Weighted Average Remaining Contractual Life (Years) 5 years 10 days
Options Outstanding Weighted Average Exercise Price $ 9.29
Options Number Exercisable | shares 153,978
Options Exercisable Weighted Average Exercise Price $ 9.26
$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 17,396
Options Outstanding Weighted Average Remaining Contractual Life (Years) 4 years 3 months 3 days
Options Outstanding Weighted Average Exercise Price $ 13.66
Options Number Exercisable | shares 17,396
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 7,335
Options Outstanding Weighted Average Remaining Contractual Life (Years) 2 years 8 months 12 days
Options Outstanding Weighted Average Exercise Price $ 24.66
Options Number Exercisable | shares 7,335
Options Exercisable Weighted Average Exercise Price $ 24.66
$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 661,852
Options Outstanding Weighted Average Remaining Contractual Life (Years) 7 years 1 month 2 days
Options Outstanding Weighted Average Exercise Price $ 6.09
Options Number Exercisable | shares 491,847
Options Exercisable Weighted Average Exercise Price $ 6.64