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Consolidated Balance Sheets (Parenthetical) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Dec. 31, 2011
Common stock, par value $ 0.01 $ 0.01 $ 0.01
Common stock, shares authorized 425,000,000 425,000,000 425,000,000
Common stock, shares issued 2,124,624 1,098,914 1,049,030
Common stock, shares outstanding 2,124,624 1,098,914 1,049,030
Treasury stock, shares 14,381 14,381 14,381
Series A-1 Convertible Preferred Stock [Member]
      
Convertible preferred stock, par value $ 0.01 $ 0.01 $ 0.01
Convertible preferred stock, shares authorized 26,874,792 26,874,792 26,874,792
Convertible preferred stock, shares issued 26,874,792 26,874,792 26,874,792
Convertible preferred stock, shares outstanding 26,874,792 26,874,792 26,874,792
Aggregate liquidation preference $ 27,000,000 $ 27,000,000 $ 27,000,000
Series A-2 Convertible Preferred Stock [Member]
      
Convertible preferred stock, par value $ 0.01 $ 0.01 $ 0.01
Convertible preferred stock, shares authorized 7,364,582 7,364,582 7,364,582
Convertible preferred stock, shares issued 7,364,582 7,364,582 7,364,582
Convertible preferred stock, shares outstanding 7,364,582 7,364,582 7,364,582
Aggregate liquidation preference 7,000,000 7,000,000 7,000,000
Series B Convertible Preferred Stock [Member]
      
Convertible preferred stock, par value $ 0.01 $ 0.01 $ 0.01
Convertible preferred stock, shares authorized 71,401,237 71,401,237 71,401,237
Convertible preferred stock, shares issued 71,401,237 71,401,237 71,401,237
Convertible preferred stock, shares outstanding 71,401,237 71,401,237 71,401,237
Aggregate liquidation preference 31,000,000 31,000,000 31,000,000
Series C Convertible Preferred Stock [Member]
      
Convertible preferred stock, par value $ 0.01 $ 0.01 $ 0.01
Convertible preferred stock, shares authorized 110,952,217 110,952,217 110,952,217
Convertible preferred stock, shares issued 110,952,217 110,952,217 110,952,217
Convertible preferred stock, shares outstanding 110,952,217 110,952,217 110,952,217
Aggregate liquidation preference 45,000,000 45,000,000 45,000,000
Series D Convertible Preferred Stock [Member]
      
Convertible preferred stock, par value $ 0.01 $ 0.01 $ 0.01
Convertible preferred stock, shares authorized 30,000,000 30,000,000 30,000,000
Convertible preferred stock, shares issued 14,446,227 14,446,227 14,446,227
Convertible preferred stock, shares outstanding 14,446,227 14,446,227 14,446,227
Aggregate liquidation preference 9,400,000 9,400,000 9,400,000
Series D-2 Convertible Preferred Stock [Member]
      
Convertible preferred stock, par value $ 0.01 $ 0.01 $ 0.01
Convertible preferred stock, shares authorized 75,000,000 75,000,000 75,000,000
Convertible preferred stock, shares issued 63,681,176 63,681,176 63,681,176
Convertible preferred stock, shares outstanding 63,681,176 63,681,176 63,681,176
Aggregate liquidation preference $ 41,500,000 $ 41,500,000 $ 41,500,000
Pro Forma [Member]
      
Common stock, shares issued 19,196,684    
Common stock, shares outstanding 19,196,684    
Pro Forma [Member] | Series A-1 Convertible Preferred Stock [Member]
      
Convertible preferred stock, shares outstanding 0    
Pro Forma [Member] | Series A-2 Convertible Preferred Stock [Member]
      
Convertible preferred stock, shares outstanding 0    
Pro Forma [Member] | Series B Convertible Preferred Stock [Member]
      
Convertible preferred stock, shares outstanding 0    
Pro Forma [Member] | Series C Convertible Preferred Stock [Member]
      
Convertible preferred stock, shares outstanding 0    
Pro Forma [Member] | Series D Convertible Preferred Stock [Member]
      
Convertible preferred stock, shares outstanding 0    
Pro Forma [Member] | Series D-2 Convertible Preferred Stock [Member]
      
Convertible preferred stock, shares outstanding 0