Annual report pursuant to Section 13 and 15(d)

Summary of Option Activity Under Stock Option Plans (Detail)

v3.7.0.1
Summary of Option Activity Under Stock Option Plans (Detail) - 2002 Stock Incentive Plan - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Shares      
Beginning Balance 4,493,000 3,475,000 4,441,000
Granted at fair market value 3,113,000 1,931,000 240,000
Granted at above fair market value   1,340,000 369,000
Exercised (1,000) (38,000) (153,000)
Forfeited, cancelled, or expired (993,000) (2,215,000) (1,422,000)
Ending Balance 6,612,000 4,493,000 3,475,000
Options exercisable, December 31, 2016 3,352,000    
Vested options expired during the 12 months ended December 31, 2016 387,000    
Weighted-Average Exercise Price Per Share      
Beginning Balance $ 2.72 $ 3.03 $ 3.51
Granted at fair market value 1.42 2.22 2.23
Granted at above fair market value   2.46 3.05
Exercised 0.82 1.15 2.03
Forfeited, cancelled, or expired 3.01 2.64 4.50
Ending Balance 2.06 $ 2.72 $ 3.03
Options exercisable, December 31, 2016 2.50    
Vested options expired during the 12 months ended December 31, 2016 $ 4.11    
Weighted-Average Remaining Contractual Term (Years)      
Options outstanding 7 years 8 months 12 days    
Options exercisable 6 years 2 months 19 days    
Aggregate Intrinsic Value      
Options outstanding [1] $ 178    
Options exercisable [1] $ 63    
[1] The intrinsic value calculation does not include negative values. This can occur when the fair market value on the reporting date is less than the exercise price of a grant.