Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Trade accounts receivable - net of allowance for doubtful accounts	$ 250	$ 227
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	50,000,000	50,000,000
Common stock, issued	25,070,386	24,124,625
Common stock, outstanding	25,070,386	24,124,625
Preferred Stock
Preferred stock, shares authorized	5,000,000	5,000,000
Series A Convertible 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	0	0
Preferred stock, outstanding	0	0