Stockholders' Equity (Details 1) (USD $)	9 Months Ended
Sep. 30, 2012
Reconciliation of option and restricted stock activity
Shares and Units Available for Grant, Beginning balance	6,409,000
Additional shares reserved under the 2012 equity incentive plan	2,903,000
Shares and Units Available for Grant, Granted	(4,317,000)
Shares and Units Available for Grant, Options exercised/ Restricted stock released
Shares and Units Available for Grant, Forfeited	882,000
Shares and Units Available for Grant, Ending balance	5,877,000
Stock Options [Member]
Reconciliation of option and restricted stock activity
Additional shares reserved under the 2012 equity incentive plan
Share-based Payment Award, Options, Outstanding, Number, Beginning Balance	15,335,000
Share-based Payment Award, Options, Grants in Period	2,115,000
Share-based Payment Award , Options exercised/ Restricted stock released in Period	(2,053,000)
Share-based Payment Award, Options, Forfeitures in Period	(750,000)
Share-based Payment Award, Options, Outstanding, Number, Ending Balance	14,647,000
Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Beginning Balance	5.70
Additional shares reserved under the 2012 equity incentive plan
Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	14.98
Share-based Payment Award, Options, Options exercised/ Restricted stock released in Period, Weighted Average Exercise Price	3.86
Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price	9.00
Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance
Restricted Stock Outstanding [Member]
Reconciliation of option and restricted stock activity
Additional shares reserved under the 2012 equity incentive plan
Restricted Stock Units Outstanding Number of Share, Beginning balance	802,000
Restricted Stock Units Outstanding Number of Share, Grants in Period	2,202,000
Restricted Stock Units Outstanding Number of Share, Options exercised/ Restricted stock released	(148,000)
Restricted Stock Units Outstanding Number of Share, Forfeited	(132,000)
Restricted Stock Units Outstanding Number of Share, Ending balance	2,724,000

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Share based compensation arrangement by share based payment award shares grant in period.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Number of additional shares authorized for issuance under an established share-based compensation plan.

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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.

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

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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

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Number of share instruments newly issued under a share-based compensation plan.

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

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average price at which grantees can acquire the shares reserved for issuance on stock options awarded.

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

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