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STATEMENT OF STOCKHOLDERS' EQUITY (DEFICIT) (Parenthetical) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Common Stock
Dec. 31, 2006
Series A convertible preferred stock
Issuance of stock, issuance costs $ 65 $ 1,768 $ 33