Income Taxes (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes
California income tax liability offset with research and development tax credit carryforwards, percentage limitation			50.00%
Tax expense related to both continuing and discontinued operations			$ 20,000,000
Income tax expense related to continuing operations	11,000	92,000	3,191,000
Income tax expense related to discontinued operations			16,800,000
Current:
Federal		(73,000)
State	11,000	165,000
Total current income tax	11,000	92,000
Income Tax Expense	$ 11,000	$ 92,000	$ 3,191,000