Consolidated Balance Sheets (Parenthetical) (USD $)	Jun. 30, 2011	Dec. 31, 2010
Consolidated Balance Sheets
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	785,189	0
Temporary equity, convertible perpetual preferred stock, shares outstanding	785,189
Temporary equity, convertible perpetual preferred stock, liquidation value	78,500,000	0
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	2,339,811	1,400,000
8% convertible perpetual preferred stock, outstanding	2,339,811	1,400,000
8% convertible perpetual preferred stock, liquidation value, discount	$ 234,000,000	$ 140,000,000
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, issued	51,691,526	51,347,163
Common stock, outstanding	51,615,686	51,271,323