Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Accounts receivable, allowance	$ 32	$ 27
Stockholders' deficit
Common Stock, par value	$ 0.01	$ 0.01
Common Stock, shares authorized	1,050,000,000	1,050,000,000
Common Stock, shares issued	232,324,000	231,023,000
Common Stock, shares outstanding	225,824,000	224,523,000
Treasury shares	6,500,000	6,500,000
Series A-1 Preferred Stock [Member]
Stockholders' deficit
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	2,000,000	2,000,000
Preferred stock, shares issued	972,000	953,000
Preferred stock, shares outstanding	972,000	953,000
Preferred stock, liquidation preference	972
Series B Preferred Stock [Member]
Stockholders' deficit
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	14,000,000	14,000,000
Preferred stock, shares issued	10,307,000	10,058,000
Preferred stock, shares outstanding	10,307,000	10,058,000
Preferred stock, liquidation preference	15,460
Series C Preferred Stock [Member]
Stockholders' deficit
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	4,100,000	4,100,000
Preferred stock, shares issued	4,278,000	4,175,000
Preferred stock, shares outstanding	4,278,000	4,175,000
Preferred stock, liquidation preference	6,417
Series D-1 Preferred Stock [Member]
Stockholders' deficit
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	3,000,000	3,000,000
Preferred stock, shares issued	1,152,000	1,124,000
Preferred stock, shares outstanding	1,152,000	1,124,000
Preferred stock, liquidation preference	1,152
Series D-2 Preferred Stock [Member]
Stockholders' deficit
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	8,000,000	8,000,000
Preferred stock, shares issued	3,384,000	3,302,000
Preferred stock, shares outstanding	3,384,000	3,302,000
Preferred stock, liquidation preference	$ 3,384