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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Consolidated Balance Sheets [Abstract]    
Allowances for trade accounts receivable current $ 447 $ 446
Preferred stock, par value $ 0.0001 $ 0.0001
Preferred stock, shares authorized 2,000,000 2,000,000
Preferred stock, shares issued      
Preferred stock, shares outstanding      
Common stock, par value $ 0.0001 $ 0.0001
Common stock, shares authorized 60,000,000 60,000,000
Common stock, shares issued 24,913,000 23,962,000
Common stock, shares outstanding 24,913,000 23,962,000