Convertible Preferred Stock (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2011
Convertible preferred stock
Carrying value	$ 268,225
Shares Outstanding	64,151
Series B Preferred Stock
Convertible preferred stock
Carrying value	14,046
Shares Outstanding	3,874
Liquidation preference (in dollars per share)	$ 4.40
Conversion price (in dollars per share)	$ 2.85
Series C Preferred Stock
Convertible preferred stock
Carrying value	24,459
Shares Outstanding	14,424
Liquidation preference (in dollars per share)	$ 1.89
Conversion price (in dollars per share)	$ 1.89
Series D Preferred Stock
Convertible preferred stock
Carrying value	28,267
Shares Outstanding	8,086
Liquidation preference (in dollars per share)	$ 3.50
Conversion price (in dollars per share)	$ 3.50
Series E Preferred Stock
Convertible preferred stock
Carrying value	64,531
Shares Outstanding	14,991
Liquidation preference (in dollars per share)	$ 4.50
Conversion price (in dollars per share)	$ 4.50
Series F Preferred Stock
Convertible preferred stock
Carrying value	59,973
Shares Outstanding	11,776
Liquidation preference (in dollars per share)	$ 5.10
Conversion price (in dollars per share)	$ 5.10
Series G Preferred Stock
Convertible preferred stock
Carrying value	$ 76,949
Shares Outstanding	11,000
Liquidation preference (in dollars per share)	$ 7.00
Conversion price (in dollars per share)	$ 7.00

The per share liquidation preference (or restrictions) of stock classified as temporary equity that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

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Amount to be paid per share that is classified as temporary equity by entity upon redemption. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

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- Definition

The number of securities classified as temporary equity that have been sold (or granted) to the entity's shareholders. Securities issued include securities outstanding and securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

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