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Statements of Mezzanine Equity - 12 months ended Dec. 31, 2013 - USD ($)
$ in Thousands
Series A Convertible Preferred Stock
Series B Convertible Preferred Stock
Series C Convertible Preferred Stock
Series D Convertible Preferred Stock
Series E Convertible Preferred Stock
Series A-1 Convertible Preferred Stock
Series A-2 Convertible Preferred Stock
Balance at Dec. 31, 2012 $ 3,550 $ 12,375 $ 50,000 $ 20,000 $ 60,841    
Balance (in shares) at Dec. 31, 2012 857,792 1,328,941 2,416,281 7,936,483 25,245,566    
Increase (Decrease) in Stockholders' Equity              
Series A-1 shares issued in exchange of convertible notes           $ 70,689  
Series A-1 shares issued in exchange of convertible notes (in shares)           45,902,321  
Exchange of Series A-1 and A-2 preferred for common stock           $ (78,526) $ (1,075)
Exchange of Series A-1 and A-2 preferred for common stock (in shares)           (49,671,392) (1,851,814)
Exchange of Series A-E Preferred for Series A-1 preferred stock $ (3,550) $ (12,375) $ (50,000) $ (20,000) $ (60,841) $ 3,045  
Exchange of Series A-E Preferred for Series A-1 preferred stock (in shares) (857,792) (1,328,941) (2,416,281) (7,936,483) (25,245,566) 1,977,137  
Exchange of Series A-1 preferred for Series A-2 preferred stock           $ (8,563) $ 1,075
Exchange of Series A-1 preferred for Series A-2 preferred stock (in shares)           (5,561,006) 1,851,814
Sale of Series A-1 preferred stock           $ 13,355  
Sale of Series A-1 preferred stock (in shares)           7,352,940