Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2011	Dec. 31, 2010
Consolidated Balance Sheets [Abstract]
Accounts receivable, allowance	$ 225,000	$ 225,000
Temporary equity, convertible perpetual preferred stock, par value	$ 0.001	$ 0.001
Temporary equity, convertible perpetual preferred stock, shares issued	806,847	0
Temporary equity, convertible perpetual preferred stock, shares outstanding	806,847	0
Temporary equity, convertible perpetual preferred stock, liquidation value	80,700,000	80,700,000
8% convertible perpetual preferred stock, par value	$ 0.001	$ 0.001
8% convertible perpetual preferred stock, shares authorized	10,000,000	10,000,000
8% convertible perpetual preferred stock, issued	2,318,153	1,400,000
8% convertible perpetual preferred stock, outstanding	2,318,153	1,400,000
8% convertible perpetual preferred stock, liquidation value, discount	$ 231,800,000	$ 140,000,000
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, issued	52,034,547	51,347,163
Common stock, outstanding	51,958,707	51,271,323