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Information Regarding Stock Options Outstanding Stock Options Vested and Expected to Vest and Stock Options Exercisable (Detail) - 2008 Equity Incentive Plan - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Number of Shares    
Outstanding options and other stock based awards 16,306 16,830
Stock options vested and expected to vest 16,151  
Stock options exercisable 12,735  
Weighted Average Exercise Price    
Stock options outstanding $ 4.71 $ 4.53
Stock options vested and expected to vest 4.70  
Stock options exercisable $ 4.61  
Weighted Average Remaining Contractual (Years)    
Stock options outstanding 5 years 3 months 3 days  
Stock options vested and expected to vest 5 years 2 months 19 days  
Stock options exercisable 4 years 4 months 9 days  
Aggregate intrinsic value    
Stock options outstanding $ 36,180  
Stock options vested and expected to vest 35,905  
Stock options exercisable $ 29,535