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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, 2019
Dec. 31, 2018
Number of Shares    
Outstanding options and other stock based awards 16,830 17,560
Stock options vested and expected to vest 16,749  
Stock options exercisable 13,751  
Weighted Average Exercise Price    
Stock options outstanding $ 4.53 $ 4.47
Stock options vested and expected to vest 4.53  
Stock options exercisable $ 4.49  
Weighted Average Remaining Contractual (Years)    
Stock options outstanding 5 years 6 months  
Stock options vested and expected to vest 5 years 4 months 24 days  
Stock options exercisable 4 years 10 months 24 days  
Aggregate intrinsic value    
Stock options outstanding $ 4,169  
Stock options vested and expected to vest 4,168  
Stock options exercisable $ 4,077