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Options Outstanding and Currently Exercisable (Detail)
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Exercise Price Range Range One  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, minimum $ 3.91
Range of Exercise Prices, maximum $ 5.42
Number of Shares Outstanding | shares 1,023,311
Options Outstanding Weighted Average Remaining Contractual Term (In Years) 4 years 10 months 17 days
Weighted Average Exercise Price $ 4.77
Number Vested and Exercisable | shares 407,446
Weighted Average Exercise Price $ 4.54
Exercise Price Range Range Two  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, minimum 5.43
Range of Exercise Prices, maximum $ 7.37
Number of Shares Outstanding | shares 924,908
Options Outstanding Weighted Average Remaining Contractual Term (In Years) 3 years 11 months 5 days
Weighted Average Exercise Price $ 6.61
Number Vested and Exercisable | shares 660,729
Weighted Average Exercise Price $ 6.61
Exercise Price Range Range Three  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, minimum 7.38
Range of Exercise Prices, maximum $ 20.10
Number of Shares Outstanding | shares 792,145
Options Outstanding Weighted Average Remaining Contractual Term (In Years) 1 year 8 months 16 days
Weighted Average Exercise Price $ 10.34
Number Vested and Exercisable | shares 761,590
Weighted Average Exercise Price $ 10.42
Exercise Price Range Range Four  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, minimum 3.91
Range of Exercise Prices, maximum $ 20.10
Number of Shares Outstanding | shares 2,740,364
Options Outstanding Weighted Average Remaining Contractual Term (In Years) 3 years 7 months 21 days
Weighted Average Exercise Price $ 7.00
Number Vested and Exercisable | shares 1,829,765
Weighted Average Exercise Price $ 7.73