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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Dec. 31, 2011
CONDENSED CONSOLIDATED BALANCE SHEETS        
Accounts receivable, allowance for doubtful accounts (in dollars) $ 179 $ 453 $ 515 $ 438
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001    
Preferred stock, shares authorized 10,000,000 10,000,000    
Preferred stock, shares issued 0 0    
Preferred stock, shares outstanding 0 0    
Common stock, par value (in dollars per share) $ 0.001 $ 0.001    
Common stock, shares authorized 30,000,000 30,000,000    
Common stock, shares issued 14,563,228 14,197,792   13,977,920
Common stock, shares outstanding 14,563,228 14,197,792