Employee Equity Incentive Plans (Details)	Dec. 31, 2012
Option Approval Method	15,775,000
Options Outstanding	13,100,508
Options Available For Future Grant	2,117,957
Options Outstanding and Options Available, Total	15,218,465
2002 Amended and Restated Stock Option Plan [Member]
Option Approval Method	3,200,000
Options Outstanding	2,753,710
Options Available For Future Grant	446,290
Options Outstanding and Options Available, Total	3,200,000
2006 Stock Option Plan [Member]
Option Approval Method	2,500,000
Options Outstanding	2,149,000
Options Available For Future Grant	351,000
Options Outstanding and Options Available, Total	2,500,000
2009 Stock Option Plan [Member]
Option Approval Method	1,500,000
Options Outstanding	1,179,333
Options Available For Future Grant	320,667
Options Outstanding and Options Available, Total	1,500,000
2010 Stock Option Plan [Member]
Option Approval Method	3,500,000
Options Outstanding	2,500,000
Options Available For Future Grant	1,000,000
Options Outstanding and Options Available, Total	3,500,000
Key Personnel Option Grants [Member]
Option Approval Method	5,075,000
Options Outstanding	4,518,465
Options Available For Future Grant	0
Options Outstanding and Options Available, Total	4,518,465
Board of Directors [Member]
Option Approval Method	5,075,000
Board of Directors [Member] | 2002 Amended and Restated Stock Option Plan [Member]
Option Approval Method	0
Board of Directors [Member] | 2006 Stock Option Plan [Member]
Option Approval Method	0
Board of Directors [Member] | 2009 Stock Option Plan [Member]
Option Approval Method	0
Board of Directors [Member] | 2010 Stock Option Plan [Member]
Option Approval Method	0
Board of Directors [Member] | Key Personnel Option Grants [Member]
Option Approval Method	5,075,000
Board of Directors and Shareholders [Member]
Option Approval Method	10,700,000
Board of Directors and Shareholders [Member] | 2002 Amended and Restated Stock Option Plan [Member]
Option Approval Method	3,200,000
Board of Directors and Shareholders [Member] | 2006 Stock Option Plan [Member]
Option Approval Method	2,500,000
Board of Directors and Shareholders [Member] | 2009 Stock Option Plan [Member]
Option Approval Method	1,500,000
Board of Directors and Shareholders [Member] | 2010 Stock Option Plan [Member]
Option Approval Method	3,500,000
Board of Directors and Shareholders [Member] | Key Personnel Option Grants [Member]
Option Approval Method	0