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STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) (Pre Acquisition, USD $) | 12 Months Ended
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Dec. 31, 2009 Series E redeemable convertible preferred stock | Dec. 31, 2009 Private Placement | Dec. 31, 2010 Public Offering
Issuance costs | $ 795,469 | $ 61,116 | $ 250,862

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