Stock-Based Compensation (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
Sep. 30, 2012
Activity under the Company's equity incentive plans related to stock options
Balance at December 31, 2011, Number of Options Outstanding	7,362
Granted, Number of Options Outstanding	1,775
Forfeited, Number of Options Outstanding	(42)
Expired, Number of Options Outstanding	(291)
Exercised, Number of Options Outstanding	(113)
Balance at September 30, 2012, Number of Options Outstanding	8,691
Balance at December 31, 2011, Weighted Average Exercise Price per Share	$ 4.70
Granted, Weighted Average Exercise Price per Share	$ 3.68
Forfeited, Weighted Average Exercise Price per Share	$ 2.52
Expired, Weighted Average Exercise Price per Share	$ 36.35
Exercised, Weighted Average Exercise Price per Share	$ 1.49
Balance at September30, 2012, Weighted Average Exercise Price per Share	$ 3.49

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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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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