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Stock Based Compensation (Stock Option Activity) (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Total Number of Shares, outstanding Beginning Balance 7,672
Stock options activity, Total Number of Shares, Granted 7,113
Stock options activity, Total Number of Shares, Exercised (289)
Stock options activity, Total Number of Shares, Cancelled (1,337)
Total Number of Shares, outstanding Ending Balance 13,159
Total Number of Shares, exercisable 6,557
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]  
Stock options activity, Weighted Average Exercise Price, Beginning balance $ 2.54
Stock options activity, Weighted Average Exercise Price, Granted $ 2.87
Stock options activity, Weighted Average Exercise Price, Exercised $ 1.21
Stock options activity, Weighted Average Exercise Price, Cancelled $ 2.80
Stock options activity, Weighted Average Exercise Price, Ending balance $ 2.73
Stock options activity, Weighted Average Exercise Price, exercisable $ 2.63
Stock options activity, Aggregate Intrinsic Value, Beginning balance $ 2,288
Stock options activity, Aggregate Intrinsic Value, Ending balance $ 30,537