Mandatorily Redeemable Convertible Preferred Stock (Details) (USD $)	12 Months Ended		0 Months Ended		1 Months Ended	12 Months Ended			0 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Feb. 07, 2011 Series A Preferred Stock [Member] Rate	Feb. 07, 2011 Series B Preferred Stock [Member] Rate	Jun. 30, 2000 Series B Preferred Stock [Member]	Dec. 31, 2012 Series B Preferred Stock [Member]	Mar. 31, 2011 Series B Preferred Stock [Member]	Dec. 31, 2010 Series B Preferred Stock [Member]	Feb. 07, 2011 Series C Preferred Stock [Member]	Feb. 07, 2011 Redeemable Convertible Preferred Stock [Member]	Dec. 31, 2011 Redeemable Convertible Preferred Stock [Member]	Dec. 31, 2011 Redeemable Convertible Preferred Stock [Member] Series B Preferred Stock [Member]	Dec. 31, 2010 General and administrative [Member] Series B Preferred Stock [Member]	Dec. 31, 2009 General and administrative [Member] Series B Preferred Stock [Member]
Class of Stock [Line Items]
Par Value	$ 0.001	$ 0.001	$ 0.001	$ 0.001					$ 0.001
Shares Authorized	10,000,000	10,000,000	5,050,000	6,250,000					4,004,000	15,304,000
Shares Outstanding	0	0	4,195,000	6,217,000					2,730,000	13,142,000
Liquidation Preference			$ 4,195,000	$ 64,830,000					$ 4,348,000	$ 73,373,000
Proceeds Net of Issuance Costs			4,150,000	35,455,000					4,302,000	43,907,000
Preferred Stock, Conversion To Common Stock, Conversion Ratio			0.786	0.908
Preferred stock, dividend rate, percentage						8.00%
Original Issue Price of Preferred Stock						$ 5.71
Preferred Stock, Triggering Event Threshold To Pay Dividends, Percent of Voting Power Transferred						50.00%
Dividends Payable							300,000	2,800,000
Payment of Accrued Dividends on Temporary Equity											29,586,000	29,600,000
Warrants	17,000	17,000			18,214,000
Investment Warrants, Exercise Price	$ 6.29				$ 5.71
Class of Warant, Change in Fair Value, Increase Decrease													$ 32,752,000	$ 15,549,000