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Employee Stock Options (Summary of Stock Option Activity) (Details) (USD $)
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3 Months Ended | 12 Months Ended | |
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Mar. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Shares Available for Grant | |||
| Beginning balance | 390,042 | 1,560,436 | 2,473,010 |
| Granted | (1,794,782) | (1,879,375) | |
| Repurchased | 8,122 | ||
| Cancelled | 624,388 | 958,679 | |
| Ending balance | 390,042 | 1,560,436 | |
| Number of Options Outstanding | |||
| Beginning balance | 4,969,745 | 4,303,672 | 3,539,600 |
| Granted | 10,748,459 | 1,794,782 | 1,879,375 |
| Exercised | (504,321) | (156,624) | |
| Cancelled | (624,388) | (958,679) | |
| Ending balance | 4,969,745 | 4,303,672 | |
| Exercisable | 2,540,220 | ||
| Weighted-Average Exercise Price | |||
| Beginnig balance | $ 0.686 | $ 0.524 | $ 0.357 |
| Granted | $ 0.930 | $ 0.792 | |
| Exercised | $ 0.127 | $ 0.203 | |
| Cancelled | $ 0.718 | $ 0.463 | |
| Ending balance | $ 0.686 | $ 0.524 | |
| Exercisable | $ 0.517 | ||
| Weighted average remaining contractual term of options exercisable | 8 years 11 days | ||
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- Definition
Increase in shares available for grant due to the repurchase of shares during the period. No definition available.
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- Details
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- Definition
The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. 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 can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, 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
For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Weighted average price of options that were either forfeited or expired. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Gross number of share options (or share units) granted during the period. No definition available.
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- Definition
Number of options outstanding, including both vested and non-vested options. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
Other than shares newly issued, the number of additional shares issued (for example, a stock split) or canceled (for example, to correct a share issuance), during the period under the plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Number of share instruments newly issued under a share-based compensation plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Weighted average price at which option holders acquired shares when converting their stock options into shares. No definition available.
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- Definition
Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. No definition available.
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- Definition
Number of share options (or share units) exercised during the current period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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