Annual report pursuant to Section 13 and 15(d)

Summary of Option Activity (Detail)

v3.8.0.1
Summary of Option Activity (Detail) - 2002 Stock Incentive Plan - $ / shares
shares in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Shares      
Beginning Balance 6,612 4,493 3,475
Granted at fair market value 2,231 3,113 1,931
Granted at above fair market value     1,340
Exercised (3) (1) (38)
Forfeited, cancelled, or expired (2,103) (993) (2,215)
Ending Balance 6,737 6,612 4,493
Options exercisable, December 31, 2017 3,454    
Vested options expired during the 12 months ended December 31, 2017 288    
Weighted-Average Exercise Price Per Share      
Beginning Balance $ 2.72 $ 3.03 $ 3.03
Granted at fair market value 1.03 1.42 2.22
Granted at above fair market value     2.46
Exercised 0.86 0.82 1.15
Forfeited, cancelled, or expired 1.83 3.01 2.64
Ending Balance 1.80 $ 2.72 $ 3.03
Options exercisable, December 31, 2017 2.24    
Vested options expired during the 12 months ended December 31, 2017 $ 3.42    
Weighted-Average Remaining Contractual Term (Years)      
Options outstanding 7 years 2 months 15 days    
Options exercisable 5 years 6 months 25 days