Annual report pursuant to Section 13 and 15(d)

Summary of Option Activity (Detail)

v2.4.0.6
Summary of Option Activity (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Number of Shares      
Beginning Balance 3,858,000 4,130,000 3,650,000
Exercised (214,000) (657,000) (225,000)
Forfeited, cancelled, or expired (966,000) (766,000) (1,386,000)
Ending Balance 3,860,000 3,858,000 4,130,000
Options exercisable, December 31, 2012 2,314,000    
Vested options expired during the twelve months ended December 31, 2012 208,000    
Weighted Average Exercise Price Per Share      
Beginning Balance $ 3.75 $ 3.60 $ 4.5
Exercised $ 2.12 $ 2.08 $ 0.89
Forfeited, cancelled, or expired $ 3.63 $ 4.92 $ 3.91
Ending Balance $ 3.48 $ 3.75 $ 3.60
Options exercisable, December 31, 2012 $ 4.02    
Vested options expired during the twelve months ended December 31, 2012 $ 4.84    
Weighted Average Remaining Contractual Life (In years)      
Options outstanding 3 years 11 months 16 days    
Options exercisable 3 years 10 months 10 days    
Aggregate Intrinsic Value      
Options outstanding $ 199,000 [1]    
Options exercisable 195,000 [1]    
Vested options expired during the twelve months ended December 31, 2012    [1]    
Granted at Fair Market Value
      
Number of Shares      
Granted 614,000 1,151,000 434,000
Weighted Average Exercise Price Per Share      
Granted $ 1.80 $ 4.11 $ 1.77
Granted at Above Fair Market Value
      
Number of Shares      
Granted 568,000   1,657,000
Weighted Average Exercise Price Per Share      
Granted $ 0.95   $ 2.00
[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.