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Summary Information about Stock Options Outstanding (Detail)
9 Months Ended
Sep. 30, 2021
$ / 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
Stock Options Number Outstanding | shares 452,510
Stock Options Outstanding Weighted Average Remaining Contractual Life (Years) 4 years 7 months 13 days
Stock Options Outstanding Weighted Average Exercise Price $ 4.41
Stock Options Number Exercisable | shares 452,510
Stock Options Exercisable Weighted Average Exercise Price $ 4.41
$7.50 - $11.25  
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 $ 11.25
Stock Options Number Outstanding | shares 61,317
Stock Options Outstanding Weighted Average Remaining Contractual Life (Years) 2 years 5 months 23 days
Stock Options Outstanding Weighted Average Exercise Price $ 10.19
Stock Options Number Exercisable | shares 61,317
Stock Options Exercisable Weighted Average Exercise Price $ 10.19
$11.30 - $16.95  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Range of Exercise Prices, lower limit 11.30
Range of Exercise Prices, upper limit $ 16.95
Stock Options Number Outstanding | shares 11,302
Stock Options Outstanding Weighted Average Remaining Contractual Life (Years) 11 months 23 days
Stock Options Outstanding Weighted Average Exercise Price $ 13.03
Stock Options Number Exercisable | shares 11,302
Stock Options Exercisable Weighted Average Exercise Price $ 13.03
$19.70 - $29.55  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Range of Exercise Prices, lower limit 19.70
Range of Exercise Prices, upper limit $ 29.55
Stock Options Number Outstanding | shares 2,347
Stock Options Outstanding Weighted Average Remaining Contractual Life (Years) 4 months 9 days
Stock Options Outstanding Weighted Average Exercise Price $ 20.98
Stock Options Number Exercisable | shares 2,347
Stock Options Exercisable Weighted Average Exercise Price $ 20.98
$4.36 - $29.55  
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 $ 29.55
Stock Options Number Outstanding | shares 527,476
Stock Options Outstanding Weighted Average Remaining Contractual Life (Years) 4 years 3 months 10 days
Stock Options Outstanding Weighted Average Exercise Price $ 5.34
Stock Options Number Exercisable | shares 527,476
Stock Options Exercisable Weighted Average Exercise Price $ 5.34