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Stock Based Compensation (Stock Option Activity) (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
 9 Months Ended
Sep. 30, 2015
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Total Number of Shares, outstanding Beginning Balance 8,590
Stock options activity, Total Number of Shares, Granted 3,682
Stock options activity, Total Number of Shares, Exercised (39)
Stock options activity, Total Number of Shares, Cancelled (1,045)
Total Number of Shares, outstanding Ending Balance 11,188
Total Number of Shares, exercisable 6,622
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 | $ / shares $ 3.25
Stock options activity, Weighted Average Exercise Price, Granted | $ / shares 1.73
Stock options activity, Weighted Average Exercise Price, Exercised | $ / shares 0.79
Stock options activity, Weighted Average Exercise Price, Cancelled | $ / shares 2.44
Stock options activity, Weighted Average Exercise Price, Ending balance | $ / shares 2.83
Stock options activity, Weighted Average Exercise Price, exercisable | $ / shares $ 3.32
Stock options activity, Aggregate Intrinsic Value, Beginning balance | $
Stock options activity, Aggregate Intrinsic Value, Granted | $
Stock options activity, Aggregate Intrinsic Value, Exercised | $ $ 37
Stock options activity, Aggregate Intrinsic Value, Cancelled | $ 21
Stock options activity, Aggregate Intrinsic Value, Ending balance | $ 690
Stock options activity, Aggregate Intrinsic Value, exercisable | $ $ 618