Stock-Based Compensation (Details 3) (Stock Options [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2013
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding	21,525
Stock options outstanding, weighted-average exercise price	$ 2.51
Stock options granted	2,971
Stock options granted, weighted-average exercise price	$ 2.11
Stock options exercised	(140)
Stock options exercised, weighted-average exercise price	$ 1.78
Stock options expired	(695)
Stock options expired, weighted-average exercise price	$ 3.62
Stock options forfeited	(5)
Stock options forfeited, weighted-average exercise price	$ 1.94
Stock options outstanding	23,656
Stock options outstanding, weighted-average exercise price	$ 2.43
Stock options exercisable	16,128
Stock options exercisable, weighted-average exercise price	$ 2.66

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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.

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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.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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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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Net 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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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 of the plan that expired.

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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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