Annual report pursuant to Section 13 and 15(d)

Compensation (Stock Option Activity) (Detail)

v3.3.1.900
Compensation (Stock Option Activity) (Detail) - $ / shares
shares in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Compensation [Abstract]      
Number of Shares Underlying Options, Outstanding at beginning of period 4,765    
Number of Shares Underlying Options, Granted 1,656    
Number of Shares Underlying Options, Exercised (245)    
Number of Shares Underlying Options, Forfeited (2,032)    
Number of Shares Underlying Options, Outstanding at end of period 4,144 4,765  
Number of Shares Underlying Options, Exercisable at end of period 2,631    
Weighted Average Exercise Price Per Share, Outstanding at beginning of period $ 7.41    
Weighted Average Exercise Price Per Share, Granted 4.41 $ 7.05 $ 7.55
Weighted Average Exercise Price Per Share, Exercised 4.28    
Weighted Average Exercise Price Per Share, Forfeited 7.20    
Weighted Average Exercise Price Per Share, Outstanding at end of period 6.41 $ 7.41  
Weighted Average Exercise Price Per Share, Exercisable at end of period $ 7.10    
Weighted Average Remaining Contractual Term, Outstanding balance 2 years 8 months 5 days 2 years 7 months 13 days  
Weighted Average Remaining Contractual Term, Granted 4 years 3 months 4 days    
Weighted Average Remaining Contractual Term, Forfeited/cancelled 1 year 10 months 24 days    
Weighted Average Remaining Contractual Term, Exercisable at end of period 2 years 2 months 9 days