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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Dec. 31, 2010
CONSOLIDATED BALANCE SHEETS      
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001 $ 0.001
Preferred stock, shares authorized 5,000,000 5,000,000 5,000,000
Preferred stock, shares issued 1,213,142 1,213,142 1,213,142
Preferred stock, shares outstanding 1,213,142 1,213,142 1,213,142
Preferred stock, liquidation preference value (in dollars) $ 14,254,419 $ 13,708,505 $ 13,344,562
Common stock, par value (in dollars per share) $ 0.001 $ 0.001 $ 0.001
Common stock, shares authorized 100,000,000 100,000,000 100,000,000
Common stock, shares issued 8,434,292 7,745,780 6,652,131
Common stock, shares outstanding 8,434,292 7,745,780 6,652,131