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Consolidated Statements Of Preferred Stock And Stockholders' Equity (Deficit) (Parenthetical) (USD $)
Dec. 31, 2006
Series A [Member]
Issuance Of Series A On December 8, 2006 [Member]
Dec. 31, 2007
Series B [Member]
Issuance For Series B On May 31, 2007 [Member]
Dec. 31, 2007
Series B [Member]
Issuance For Series B On December 28, 2007 [Member]
Dec. 31, 2005
Cash, Net Of Offering Costs [Member]
Dec. 31, 2004
Cash, Net Of Offering Costs [Member]
Dec. 31, 2002
Cash, Net Of Offering Costs [Member]
Dec. 31, 2006
Issuance Of Series A On February 22, 2006 [Member]
Dec. 31, 2004
Issuance For Notes Payable and Related Accrued Interest On January 3, 2005 [Member]
Dec. 31, 2006
Issuance For Notes Payable And Related Accrued Interest On February 22, 2006 [Member]
Dec. 31, 2004
Issuance For Intellectual Property License Rights On October 14, 2005 [Member]
Dec. 31, 2006
Issuance For Intellectual Property License Rights On February 21, 2006 [Member]
Dec. 31, 2006
Issuance For Intellectual Property License Rights On February 22, 2006 [Member]
Dec. 31, 2006
Issuance For Intellectual Property License Rights On June 23, 2006 [Member]
Dec. 31, 2006
Issuance For Intellectual Property License Rights On November 7, 2006 [Member]
Dec. 31, 2007
Issuance For Intellectual Property License Rights On January 18, 2007 [Member]
Dec. 31, 2007
Issuance For Intellectual Property License Rights On June 30, 2007 [Member]
Issuance of common stock, per share   $ 0.06$ 0.06$ 0.06 $ 0.06 $ 8.14$ 0.72$ 0.72$ 0.9$ 0.9$ 1.68$ 1.8
Issuance of preferred stock, per share$ 1.6265$ 2.439$ 3.253   $ 1.6265 $ 1.6265