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Summary of Business and Significant Accounting Policies (Details 1)
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3 Months Ended | 6 Months Ended | ||
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Jun. 30, 2012
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Jun. 30, 2011
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Jun. 30, 2012
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Jun. 30, 2011
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Stock Options [Member]
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| Fair value of stock option grant and stock purchase right granted under the ESPP estimated on the date of grant using Black-Scholes option pricing model | ||||
| Expected volatility, minimum | 54.00% | 50.00% | 54.00% | 50.00% |
| Expected volatility, maximum | 55.00% | 56.00% | 57.00% | 69.00% |
| Expected term (in years) | 6 years 15 days | 6 years 26 days | 6 years 15 days | 6 years 22 days |
| Risk-free interest rate, minimum | 0.90% | 1.71% | 0.90% | 1.69% |
| Risk-free interest rate, maximum | 1.17% | 2.23% | 1.18% | (2.67%) |
| Dividend yield | ||||
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2012 ESPP [Member]
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| Fair value of stock option grant and stock purchase right granted under the ESPP estimated on the date of grant using Black-Scholes option pricing model | ||||
| Expected volatility | 41.58% | 41.58% | ||
| Expected term (in years) | 6 months 29 days | 6 months 29 days | ||
| Risk-free interest rate | 0.16% | 0.16% | ||
| Dividend yield | ||||
| X | ||||||||||
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- Definition
Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Period the instrument, asset or liability is expected to be outstanding, 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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| X | ||||||||||
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- Definition
Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Risk-free interest rate assumption used in valuing an instrument. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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| X | ||||||||||
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- Definition
The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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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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| X | ||||||||||
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- Definition
The estimated measure of the maximum 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. No definition available.
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| X | ||||||||||
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- Definition
The estimated measure of the minimum 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. No definition available.
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| X | ||||||||||
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- Definition
The maximum risk-free interest rate assumption that is used in valuing an option on its own shares. No definition available.
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| X | ||||||||||
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- Definition
The minimum risk-free interest rate assumption that is used in valuing an option on its own shares. No definition available.
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