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Consolidated Balance Sheets (Parenthetical) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 425,000,000 425,000,000
Common stock, shares issued 2,124,624 1,098,914
Common stock, shares outstanding 2,124,624 1,098,914
Treasury stock, shares 14,381 14,381
Series A-1 Convertible Preferred Stock [Member]
    
Convertible preferred stock, par value $ 0.01 $ 0.01
Convertible preferred stock, shares authorized 26,874,792 26,874,792
Convertible preferred stock, shares issued 26,874,792 26,874,792
Convertible preferred stock, shares outstanding 26,874,792 26,874,792
Aggregate liquidation preference $ 27,000,000 $ 27,000,000
Series A-2 Convertible Preferred Stock [Member]
    
Convertible preferred stock, par value $ 0.01 $ 0.01
Convertible preferred stock, shares authorized 7,364,582 7,364,582
Convertible preferred stock, shares issued 7,364,582 7,364,582
Convertible preferred stock, shares outstanding 7,364,582 7,364,582
Aggregate liquidation preference 7,000,000 7,000,000
Series B Convertible Preferred Stock [Member]
    
Convertible preferred stock, par value $ 0.01 $ 0.01
Convertible preferred stock, shares authorized 71,401,237 71,401,237
Convertible preferred stock, shares issued 71,401,237 71,401,237
Convertible preferred stock, shares outstanding 71,401,237 71,401,237
Aggregate liquidation preference 31,000,000 31,000,000
Series C Convertible Preferred Stock [Member]
    
Convertible preferred stock, par value $ 0.01 $ 0.01
Convertible preferred stock, shares authorized 110,952,217 110,952,217
Convertible preferred stock, shares issued 110,952,217 110,952,217
Convertible preferred stock, shares outstanding 110,952,217 110,952,217
Aggregate liquidation preference 45,000,000 45,000,000
Series D-1 Convertible Preferred Stock [Member]
    
Convertible preferred stock, par value $ 0.01 $ 0.01
Convertible preferred stock, shares authorized 30,000,000 30,000,000
Convertible preferred stock, shares issued 14,446,227 14,446,227
Convertible preferred stock, shares outstanding 14,446,227 14,446,227
Aggregate liquidation preference 9,400,000 9,400,000
Series D-2 Convertible Preferred Stock [Member]
    
Convertible preferred stock, par value $ 0.01 $ 0.01
Convertible preferred stock, shares authorized 75,000,000 75,000,000
Convertible preferred stock, shares issued 63,681,176 63,681,176
Convertible preferred stock, shares outstanding 63,681,176 63,681,176
Aggregate liquidation preference $ 41,500,000 $ 41,500,000