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Convertible preferred stock and preferred stock (Liquidation) (Details) (USD $)	Dec. 31, 2011
Warrants [Line Items]
Voting power preferred stock after liquidation	51.00%
Series A convertible preferred stock
Warrants [Line Items]
Liquidation preference per share (in dollars per share)	2.02800
Conversion preferrred stock in common stock during liquidation (in dollars per share)	8.11200
Series B convertible preferred stock
Warrants [Line Items]
Liquidation preference per share (in dollars per share)	7.92000
Conversion preferrred stock in common stock during liquidation (in dollars per share)	23.76000
Series C convertible preferred stock
Warrants [Line Items]
Liquidation preference per share (in dollars per share)	2.85000
Conversion preferrred stock in common stock during liquidation (in dollars per share)	8.55000
Series D convertible preferred stock
Warrants [Line Items]
Liquidation preference per share (in dollars per share)	3.28152
Conversion preferrred stock in common stock during liquidation (in dollars per share)	9.84456
Series E convertible preferred stock
Warrants [Line Items]
Liquidation preference per share (in dollars per share)	6.61140
Conversion preferrred stock in common stock during liquidation (in dollars per share)	19.83420
Series F convertible preferred stock
Warrants [Line Items]
Liquidation preference per share (in dollars per share)	7.46520
Conversion preferrred stock in common stock during liquidation (in dollars per share)	22.39560

The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) 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.

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- Definition

The price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control of the issuer.

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