Annual report pursuant to Section 13 and 15(d)

Options Outstanding and Exercisable (Detail)

v2.4.0.6
Options Outstanding and Exercisable (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding Number of Shares 3,860,000
Options Outstanding Weighted Average Exercise Price $ 3.48
Options Outstanding Weighted Average Remaining Contractual Life 3 years 11 months 16 days
Options Exercisable Number of Shares 2,314,000
Options Exercisable Weighted Average Exercise Price $ 4.02
Range One
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range Exercise Price, Lower Limit $ 0.72
Range Exercise Price, Upper Limit $ 1.99
Options Outstanding Number of Shares 456,000
Options Outstanding Weighted Average Exercise Price $ 1.43
Options Outstanding Weighted Average Remaining Contractual Life 5 years 6 months
Options Exercisable Number of Shares 379,000
Options Exercisable Weighted Average Exercise Price $ 1.35
Range Two
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range Exercise Price, Lower Limit $ 2.00
Range Exercise Price, Upper Limit $ 2.99
Options Outstanding Number of Shares 2,175,000
Options Outstanding Weighted Average Exercise Price $ 2.28
Options Outstanding Weighted Average Remaining Contractual Life 3 years 10 months 28 days
Options Exercisable Number of Shares 917,000
Options Exercisable Weighted Average Exercise Price $ 2.08
Range Three
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range Exercise Price, Lower Limit $ 3.00
Range Exercise Price, Upper Limit $ 3.99
Options Outstanding Number of Shares 159,000
Options Outstanding Weighted Average Exercise Price $ 3.20
Options Outstanding Weighted Average Remaining Contractual Life 3 years 6 months
Options Exercisable Number of Shares 75,000
Options Exercisable Weighted Average Exercise Price $ 3.20
Range Four
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range Exercise Price, Lower Limit $ 4.00
Range Exercise Price, Upper Limit $ 4.99
Options Outstanding Number of Shares 268,000
Options Outstanding Weighted Average Exercise Price $ 4.25
Options Outstanding Weighted Average Remaining Contractual Life 4 years 6 months
Options Exercisable Number of Shares 232,000
Options Exercisable Weighted Average Exercise Price $ 4.15
Range Five
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range Exercise Price, Lower Limit $ 5.00
Range Exercise Price, Upper Limit $ 5.99
Options Outstanding Number of Shares 373,000
Options Outstanding Weighted Average Exercise Price $ 5.44
Options Outstanding Weighted Average Remaining Contractual Life 4 years 2 months 19 days
Options Exercisable Number of Shares 288,000
Options Exercisable Weighted Average Exercise Price $ 5.45
Range Six
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range Exercise Price, Lower Limit $ 6.00
Range Exercise Price, Upper Limit $ 9.99
Options Outstanding Number of Shares 225,000
Options Outstanding Weighted Average Exercise Price $ 7.49
Options Outstanding Weighted Average Remaining Contractual Life 3 years 1 month 13 days
Options Exercisable Number of Shares 219,000
Options Exercisable Weighted Average Exercise Price $ 7.53
Range Seven
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range Exercise Price, Lower Limit $ 10.00
Range Exercise Price, Upper Limit $ 13.99
Options Outstanding Number of Shares 150,000
Options Outstanding Weighted Average Exercise Price $ 11.34
Options Outstanding Weighted Average Remaining Contractual Life 1 year 3 months 22 days
Options Exercisable Number of Shares 150,000
Options Exercisable Weighted Average Exercise Price $ 11.34
Range Eight
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range Exercise Price, Lower Limit $ 14.00
Range Exercise Price, Upper Limit $ 18.99
Options Outstanding Number of Shares 54,000
Options Outstanding Weighted Average Exercise Price $ 14.14
Options Outstanding Weighted Average Remaining Contractual Life 1 year 5 months 5 days
Options Exercisable Number of Shares 54,000
Options Exercisable Weighted Average Exercise Price $ 14.14