Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Trade accounts receivable, allowance for doubtful accounts	$ 222	$ 290
Preferred stock, shares authorized	5,000,000	5,000,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	50,000,000	50,000,000
Common stock, issued	23,964,320	23,783,106
Common stock, Outstanding	23,964,320	23,783,106
Series A Preferred Stock
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, liquidation preference value	$ 100	$ 100
Preferred stock, shares authorized	150,000	150,000
Preferred stock, issued
Preferred stock, outstanding