1. Stock-based Compensation (Details) (USD $)	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012
Number of Shares
Outstanding options, beginning balance	8,652,000
Granted	3,025,000
Exercised	(394,000)	(87,000)
Forfeited
Outstanding options, ending balance	11,283,000
Options exercisable	6,174,000
Outstanding options, beginning balance	$ 1.58
Granted	$ 7.43
Exercised	$ 1.73
Forfeited
Outstanding options, ending balance	$ 3.15
Options exercisable	$ 1.69
Weighted Average Remaining Contractual Term
Outstanding options, ending balance	6 years 9 months 29 days
Options exercisable	4 years 11 months 19 days

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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.

+ References

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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.

+ References

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- Definition

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.

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Net number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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- Definition

Weighted average price at which option holders acquired shares when converting their stock options into shares.

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No definition available.

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- Definition

Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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No definition available.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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No definition available.

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- Definition

Weighted average remaining contractual term of exercisable stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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Number of share options (or share units) exercised during the current period.

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