CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Current assets:
Accounts receivable, allowance	$ 3	$ 9
Stockholders' Equity
Common Stock, par value	$ 0.01	$ 0.01
Common Stock, shares authorized	1,050,000,000	1,050,000,000
Common Stock, shares issued	198,188,000	191,489,000
Common Stock, shares outstanding	198,188,000	191,489,000
Series A Preferred Stock [Member]
Stockholders' Equity
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	2,000,000	2,000,000
Preferred stock, shares issued	880,000	813,000
Preferred stock, shares outstanding	880,000	813,000
Preferred stock, liquidation preference	880
Series B Preferred Stock [Member]
Stockholders' Equity
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	14,000,000	14,000,000
Preferred stock, shares issued	9,250,000	8,380,000
Preferred stock, shares outstanding	9,250,000	8,380,000
Preferred stock, liquidation preference	13,875
Series C Preferred Stock [Member]
Stockholders' Equity
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	4,100,000	4,100,000
Preferred stock, shares issued	3,547,000	2,211,000
Preferred stock, shares outstanding	3,547,000	2,211,000
Preferred stock, liquidation preference	$ 5,320