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Employee Stock Options (Schedule of Fair Value Calculation Assumptions) (Details)
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3 Months Ended | 12 Months Ended | ||
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Mar. 31, 2014
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Mar. 31, 2013
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Dec. 31, 2013
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Dec. 31, 2012
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| Employees | ||||
| Dividend yield | ||||
| Expected term | 6 years | |||
| Volatility | 66.00% | 65.00% | 65.00% | |
| Forfeiture rate | 10.00% | 10.00% | ||
| Share-based Goods and Nonemployee Services Transaction [Abstract] | ||||
| Dividend yield | ||||
| Risk-free interest rate | 1.63% | |||
| Expected term | 5 years | 5 years | ||
| Volatility | 67.00% | |||
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Minimum [Member]
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| Employees | ||||
| Risk-free interest rate | 1.74% | 0.83% | 0.83% | 1.20% |
| Expected term | 5 years | 5 years | 5 years | |
| Volatility | 65.00% | |||
| Share-based Goods and Nonemployee Services Transaction [Abstract] | ||||
| Risk-free interest rate | 0.83% | |||
| Volatility | 66.00% | |||
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Maximum [Member]
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| Employees | ||||
| Risk-free interest rate | 2.68% | 1.13% | 1.93% | 2.49% |
| Expected term | 10 years | 10 years | 6 years | |
| Volatility | 70.00% | |||
| Share-based Goods and Nonemployee Services Transaction [Abstract] | ||||
| Risk-free interest rate | 1.73% | |||
| Volatility | 71.00% | |||
| X | ||||||||||
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- Definition
The estimated forfeiture rate (a percentage of the outstanding options) to be forfeited or cancelled over the option's term. No definition available.
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| X | ||||||||||
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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 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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| X | ||||||||||
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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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| X | ||||||||||
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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 expected term of a nonvested share or option award issued to other than an employee. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Period an equity-based award 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
The estimated measure of the percentage amount by which a share price is expected to fluctuate during the expected term of a nonvested share or option award issued to other than an employee. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The risk-free interest rate assumption that is used in valuing a nonvested share or option award issued to other than an employee. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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