Income Taxes (Details 4) (USD $)	1 Months Ended	12 Months Ended
	Jan. 31, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation between the U.S. federal statutory tax rate and effective tax rate from continuing operations
Tax at U.S. federal statutory rate (as a percent)		(35.00%)	(35.00%)	(35.00%)
Change in valuation allowance (as a percent)		34.00%	38.00%	35.00%
Permanent items (as a percent)		1.00%	1.00%	1.00%
Extinguishment of debt (as a percent)				3.00%
Tax credits (as a percent)			(4.00%)	(4.00%)
Effective tax rate (as a percent)		0.00%	0.00%	0.00%
Portion of unrecognized tax benefits that, would affect the effective tax rate, if recognized		$ 160,000
Reconciliation of beginning and ending amount of unrecognized tax benefits
Unrecognized tax benefits at the beginning of period	1,215,000	1,215,000	1,171,000
Gross increase/(decrease) for tax positions of prior years			44,000	1,171,000
Gross increase/(decrease) for tax positions of current year		0	0	0
Settlements		0	0	0
Lapse of statute of limitations		0	0	0
Unrecognized tax benefits balance as the ending of period		1,215,000	1,215,000	1,171,000
Unrecognized tax benefits recorded on consolidated balance sheets
Total unrecognized tax benefits		1,215,000	1,215,000	1,171,000
Amounts netted against deferred tax assets		(1,055,000)	(1,055,000)
Unrecognized tax benefits recorded on consolidated balance sheets		160,000	160,000
Additional disclosure
Interest and penalties accrued on unrecognized tax benefits	33,000
Interest recognized on unrecognized tax benefits		$ 6,000