Annual report pursuant to Section 13 and 15(d)

STATEMENT OF STOCKHOLDERS' EQUITY (Parenthetical)

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STATEMENT OF STOCKHOLDERS' EQUITY (Parenthetical) (USD $)
Dec. 31, 2011
Dec. 31, 2009
STATEMENT OF STOCKHOLDERS' EQUITY    
Issuance of common stock for cash, issuance costs (in dollars per share) $ 8.00 $ 7.25