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Stock-Based Compensation (Details 3) (Stock Options [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Stock Options [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock options outstanding 20,476
Stock options outstanding, weighted-average exercise price $ 2.84
Stock options granted 3,231
Stock options granted, weighted-average exercise price $ 1.79
Stock options exercised (167)
Stock options exercised, weighted-average exercise price $ 1.65
Stock options expired (855)
Stock options expired, weighted-average exercise price $ 7.87
Stock options forfeited (221)
Stock options forfeited, weighted-average exercise price $ 1.77
Stock options outstanding 22,464
Stock options outstanding, weighted-average exercise price $ 2.52
Stock options exercisable 15,028
Stock options exercisable, weighted-average exercise price $ 2.88