Quarterly report pursuant to Section 13 or 15(d)

Compensation (Stock Option Activity) (Detail)

v3.4.0.3
Compensation (Stock Option Activity) (Detail) - $ / shares
shares in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Compensation [Abstract]    
Number of Shares Underlying Options, Outstanding at beginning of period 4,144  
Number of Shares Underlying Options, Granted 1,519  
Number of Shares Underlying Options, Forfeited (574)  
Number of Shares Underlying Options, Outstanding at end of period 5,089 4,144
Weighted Average Exercise Price Per Share, Outstanding at beginning of period $ 6.41  
Weighted Average Exercise Price Per Share, Granted 1.16  
Weighted Average Exercise Price Per Share, Forfeited 6.57  
Weighted Average Exercise Price Per Share, Outstanding at end of period $ 4.82 $ 6.41
Weighted Average Remaining Contractual Term, Outstanding balance   2 years 8 months 5 days
Weighted Average Remaining Contractual Term, Granted 3 years 11 months 12 days  
Weighted Average Remaining Contractual Term, Forfeited/cancelled 1 year 2 months 12 days  
Weighted Average Remaining Contractual Term, Vested - end of period 3 years 11 days