Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details)

Stockholders' Equity (Details) (Platinum Warrant)
1 Months Ended
May 31, 2009
K Financing
May 31, 2011
K Equity
Dec. 31, 2010
K Equity
Sep. 30, 2012
K Equity
Stockholders' Equity        
Stock issued during the period (in shares) 26,848,484      
Percentage of outstanding common stock at the time of issuance 49.90%      
Warrant exercised on a net exercise basis (in shares)   7,538,061 10,893,608  
Number of shares sold by underwriters   7,000,000 10,000,000  
Warrants outstanding (in shares)       8,416,815