v2.4.0.6
Summary Of Option Activity (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule Of Share Based Compensation Stock Options Activity [Line Items]      
Outstanding January, Shares Subject to Options 9,036,000 7,365,000  
Forfeited / Expired, Shares Subject to Options (1,630,000) (392,000)  
Exercised, Shares Subject to Options (425,000) (1,362,000)  
Granted, Shares Subject to Options 150,000 3,425,000  
Outstanding December, Shares Subject to Options 7,131,000 9,036,000 7,365,000
Exercisable, December 31, 2012, Shares Subject to Options 3,402,000    
Outstanding at January, Weighted Average Exercise Price Per Share $ 0.72 $ 0.67  
Forfeited / Expired, Weighted Average Exercise Price Per Share $ 1.08 $ 0.89  
Exercised, Weighted Average Exercise Price Per Share $ 0.46 $ 0.46  
Granted, Weighted Average Exercise Price Per Share $ 0.88 $ 0.74  
Outstanding at December, Weighted Average Exercise Price Per Share $ 0.65 $ 0.72 $ 0.67
Exercisable, December 31, 2012, Weighted Average Exercise Price Per Share $ 0.66    
Outstanding, Weighted Average Remaining Contractual Life 3 years 1 month 6 days 3 years 2 months 12 days 2 years 1 month 6 days
Exercisable, December 31, 2012, Weighted Average Remaining Contractual Life 2 years 1 month 6 days    
Outstanding at December, Aggregate Intrinsic Value $ 2,000,000 $ 1,400,000  
Exercisable, December 31, 2012, Aggregate Intrinsic Value $ 1,000,000