Income Taxes (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Income Taxes [Abstract]
Income tax expense	$ 6,000	$ 3,000
Components of the net deferred tax asset [Abstract]
Net Operating loss carryforwards	68,890,000	65,132,000
Depreciation and amortization	2,361,000	2,476,000
Accruals and reserves	659,000	709,000
Tax credits	535,000	535,000
Share-based compensation	3,922,000	3,832,000
Total deferred tax assets	76,367,000	72,684,000
Less: valuation allowance	(76,367,000)	(72,684,000)
Total	0	0
Operating Loss Carryforwards [Line Items]
Change in valuation allowance	2,700,000	1,900,000
Effective income tax rate and the federal statutory rate [Abstract]
Federal tax rate from continuing operations (in hundredths)	34.00%	34.00%
Permanent Differences (in hundredths)	(0.10%)	(0.30%)
State taxes, including permanent differences (in hundredths)	(0.10%)	(0.20%)
Change in valuation allowance (in hundredths)	(33.80%)	(31.00%)
Other (in hundredths)	(0.10%)	(2.70%)
Total (in hundredths)	(0.10%)	(0.20%)
Federal [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	194,000,000
Alternative minimum tax credit carryforwards	110,000
Exercise of stock options included in net operating loss carryforwards	47,000,000
State [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	70,000,000
Alternative minimum tax credit carryforwards	60,000
Exercise of stock options included in net operating loss carryforwards	$ 3,000,000