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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, 2017
Dec. 31, 2016
Number of Shares    
Outstanding options and other stock based awards 17,138 15,787
Stock options vested and expected to vest 16,911  
Stock options exercisable 12,109  
Weighted Average Exercise Price    
Stock options outstanding $ 4.27 $ 4.39
Stock options vested and expected to vest 4.27  
Stock options exercisable $ 4.12  
Weighted Average Remaining Contractual (Years)    
Stock options outstanding 6 years 3 months 18 days  
Stock options vested and expected to vest 6 years 2 months 12 days  
Stock options exercisable 5 years 4 months 24 days  
Aggregate intrinsic value    
Stock options outstanding $ 3,691  
Stock options vested and expected to vest 3,681  
Stock options exercisable $ 3,487