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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, 2021
Dec. 31, 2020
Number of Shares    
Outstanding options and other stock based awards 15,092 16,306
Stock options vested and expected to vest 14,986  
Stock options exercisable 12,161  
Weighted Average Exercise Price    
Stock options outstanding $ 5.02 $ 4.71
Stock options vested and expected to vest 5.01  
Stock options exercisable $ 4.84  
Weighted Average Remaining Contractual (Years)    
Stock options outstanding 5 years 1 month 20 days  
Stock options vested and expected to vest 5 years 1 month 9 days  
Stock options exercisable 4 years 3 months 25 days  
Aggregate intrinsic value    
Stock options outstanding $ 27,194  
Stock options vested and expected to vest 27,116  
Stock options exercisable $ 24,076