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Earnings Per Share (Details)
9 Months Ended 1 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
May 31, 2013
Series C Redeemable Convertible Preferred Stock [Member]
Sep. 30, 2013
Common stock warrants [Member]
Feb. 20, 2013
Common stock warrants [Member]
May 31, 2011
Common stock warrants [Member]
Class of Warrant or Right [Line Items]            
Warrants granted         23,637,500 7,128,563
Number of warrants increased as issuance of Series C redeemable convertible preferred stock       22,995,365    
Exercise of warrants (in shares)       18,996,400    
Number of anti-dilutive Series C redeemable convertible preferred stock 42,755,013 11,695,791 10,431