Activity of Stock Option by Exercise Price Range (Detail) (USD $)
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12 Months Ended | ||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] | |||
Range of Exercise Prices, lower range | $ 0.35 | $ 0.35 | $ 0.35 |
Range of Exercise Prices, upper range | $ 6.74 | $ 6.74 | $ 7.08 |
Options Outstanding | 5,422,130 | 4,641,039 | 4,716,439 |
Options Outstanding Weighted Average Remaining Life in Years | 6 years 4 months 21 days | 6 years 7 months 6 days | 7 years 18 days |
Options Outstanding Weighted Average Exercise Price | $ 2.19 | $ 2.23 | $ 2.35 |
Options Exercisable | 3,775,388 | 3,206,994 | 2,904,435 |
Weighted Average Exercise Price of Options Exercisable | $ 2.37 | $ 2.23 | $ 2.20 |
Total intrinsic value of options exercised | $ 215,541 | $ 216,576 | $ 1,049,489 |
Total fair value of options vested | $ 1,170,738 | $ 1,435,186 | $ 1,648,292 |
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- Definition
The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. No definition available.
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- Definition
Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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