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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, 2018
Dec. 31, 2017
Number of Shares    
Outstanding options and other stock based awards 17,560 17,138
Stock options vested and expected to vest 17,276  
Stock options exercisable 12,336  
Weighted Average Exercise Price    
Stock options outstanding $ 4.47 $ 4.27
Stock options vested and expected to vest 4.47  
Stock options exercisable $ 4.37  
Weighted Average Remaining Contractual (Years)    
Stock options outstanding 6 years 3 months 18 days  
Stock options vested and expected to vest 6 years 3 months 18 days  
Stock options exercisable 5 years 4 months 24 days  
Aggregate intrinsic value    
Stock options outstanding $ 14,345  
Stock options vested and expected to vest 14,179  
Stock options exercisable $ 11,402