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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, 2022
Dec. 31, 2021
Number of Shares    
Outstanding options and other stock based awards 15,756 15,092
Stock options vested and expected to vest 15,655  
Stock options exercisable 12,680  
Weighted Average Exercise Price    
Stock options outstanding $ 5.12 $ 5.02
Stock options vested and expected to vest 5.12  
Stock options exercisable $ 4.98  
Weighted Average Remaining Contractual (Years)    
Stock options outstanding 4 years 10 months 6 days  
Stock options vested and expected to vest 4 years 9 months 25 days  
Stock options exercisable 3 years 11 months 15 days  
Aggregate intrinsic value    
Stock options outstanding $ 173  
Stock options vested and expected to vest 173  
Stock options exercisable $ 173