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Consolidated Balance Sheets (Parenthetical) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 125,000,000 425,000,000
Common stock, shares outstanding 25,177,597 1,098,914
Treasury stock, shares 14,381 14,381
Series A-1 Convertible Preferred Stock [Member]
    
Convertible preferred stock, par value   $ 0.01
Convertible preferred stock, shares authorized   26,874,792
Convertible preferred stock, shares issued   26,874,792
Convertible preferred stock, shares outstanding   26,874,792
Aggregate liquidation preference   $ 27,000,000
Series A-2 Convertible Preferred Stock [Member]
    
Convertible preferred stock, par value   $ 0.01
Convertible preferred stock, shares authorized   7,364,582
Convertible preferred stock, shares issued   7,364,582
Convertible preferred stock, shares outstanding   7,364,582
Aggregate liquidation preference   7,000,000
Series B Convertible Preferred Stock [Member]
    
Convertible preferred stock, par value   $ 0.01
Convertible preferred stock, shares authorized   71,401,237
Convertible preferred stock, shares issued   71,401,237
Convertible preferred stock, shares outstanding   71,401,237
Aggregate liquidation preference   31,000,000
Series C Convertible Preferred Stock [Member]
    
Convertible preferred stock, par value   $ 0.01
Convertible preferred stock, shares authorized   110,952,217
Convertible preferred stock, shares issued   110,952,217
Convertible preferred stock, shares outstanding   110,952,217
Aggregate liquidation preference   45,000,000
Series D-1 Convertible Preferred Stock [Member]
    
Convertible preferred stock, par value   $ 0.01
Convertible preferred stock, shares authorized   30,000,000
Convertible preferred stock, shares issued   14,446,227
Convertible preferred stock, shares outstanding   14,446,227
Aggregate liquidation preference   9,400,000
Series D-2 Convertible Preferred Stock [Member]
    
Convertible preferred stock, par value   $ 0.01
Convertible preferred stock, shares authorized   75,000,000
Convertible preferred stock, shares issued   63,681,176
Convertible preferred stock, shares outstanding   63,681,176
Aggregate liquidation preference   $ 41,500,000