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Stock Plans and Stock-Based Compensation - Fair Value Of Option (Detail) (USD $)
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12 Months Ended | |
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Dec. 31, 2013
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Dec. 31, 2012
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Maximum [Member]
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| Stock option plans | ||
| Exercise price | $ 9.21 | $ 7.84 |
| Expected stock price volatility | 112.70% | 114.30% |
| Risk free rate of interest | 3.04% | 2.23% |
| Expected life of options | 10 years | 10 years |
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Minimum [Member]
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| Stock option plans | ||
| Exercise price | $ 1.71 | $ 4.75 |
| Expected stock price volatility | 81.30% | 87.30% |
| Risk free rate of interest | 1.01% | 0.16% |
| Expected life of options | 6 years | 2 years |
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- Details
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- Definition
Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award. No definition available.
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- Definition
Expected term of share-based compensation awards, 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 estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The risk-free interest rate assumption that is used in valuing an option on its own shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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