Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Consolidated Balance Sheets [Abstract]
Accounts receivable, allowance	$ 5	$ 51
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	5,000	5,000
Preferred stock, shares issued	3	3
Preferred stock, shares outstanding	3	3
Preferred stock, liquidation preference	$ 9,496	$ 9,496
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	112,500	112,500
Common stock, shares issued	51,211	47,329
Common stock, shares outstanding	51,211	47,329