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Stockholders' Equity and Employee Stock Option Plans 1997 Stock Plan (Details)	12 Months Ended
	Dec. 31, 2012
1997 Stock Plan [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	17,707,231
Scheduled annual increase of authorized options, limit 1	5,000,000
Scheduled annual increase of authorized options, limit 2	0.04

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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