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Convertible Promissory Notes and Conversion of Convertible Preferred Stock (Details)
 1 Months Ended 12 Months Ended
Dec. 03, 2013
shares
Sep. 23, 2013
USD ($)
$ / shares
shares
Jun. 26, 2013
USD ($)
$ / shares
shares
Jun. 13, 2013
USD ($)
$ / shares
shares
Jun. 30, 2013
USD ($)
Dec. 31, 2013
USD ($)
shares
Dec. 31, 2015
shares
Dec. 31, 2014
shares
Convertible Promissory Notes                
Loss on extinguishment of debt (in dollars)           $ (48,556,000)    
Net deemed contribution on exchange of preferred stock           144,765,000    
Fair value of stock converted (in dollars)           79,601,000    
Convertible preferred stock issued (in shares) | shares             0 0
Aggregate purchase price of convertible preferred stock (in dollars)           10,000,000    
Deemed dividend (in dollars)           (3,429,000)    
Note Conversion Agreement                
Convertible Promissory Notes                
Associated transaction costs (in dollars)           $ 41,000    
Series AE Converted To Series A-1 Preferred Shares                
Convertible Promissory Notes                
Exchange of Series A-E/A-1 for A-1/A-2 Preferred stock | shares       257,409        
Net deemed contribution on exchange of preferred stock       $ 140,600,000        
Reduction in deemed contribution due to issuance cost       $ 3,000,000        
Series A1 Converted To Series A2 Preferred Shares                
Convertible Promissory Notes                
Net deemed contribution on exchange of preferred stock     $ 7,500,000          
Conversion ratio Series A-1 to Series A-2         3      
Series A-1 Convertible Preferred Stock                
Convertible Promissory Notes                
Number of shares issued on conversion of notes | shares           45,902,321    
Number of preferred stock converted (in shares) | shares 49,671,392         (49,671,392)    
Exchange of Series A-E/A-1 for A-1/A-2 Preferred stock | shares 16,022,915   5,561,006          
Associated transaction costs (in dollars)   $ 34,000 $ 40,000          
Fair value of stock issued (in dollars)   $ 4,700,000            
Fair value of stock converted (in dollars)     $ 8,600,000          
Convertible preferred stock issued (in shares) | shares   1,766,430 5,586,510     7,352,940    
Share Price | $ / shares   $ 1.36 $ 1.36          
Aggregate purchase price of convertible preferred stock (in dollars)   $ 2,400,000 $ 7,600,000   $ 10,000,000      
Deemed dividend (in dollars)   $ 2,300,000 $ 1,000,000   $ 1,000,000      
Fair value of convertible preferred stock (in dollars per share) | $ / shares   $ 2.69 $ 1.54          
Series A-1 Convertible Preferred Stock | Note Conversion Agreement                
Convertible Promissory Notes                
Number of shares issued on conversion of notes | shares       45,902,321        
Number of preferred stock converted (in shares) | shares       5,303,597        
Fair value of stock issued (in dollars)       $ 70,700,000        
Share Price | $ / shares       $ 1.54        
Series A-1 Convertible Preferred Stock | Series AE Converted To Series A-1 Preferred Shares                
Convertible Promissory Notes                
Exchange of Series A-E/A-1 for A-1/A-2 Preferred stock | shares       1,977,137        
Fair value of stock issued (in dollars)       $ 3,000,000        
Series A-2 Convertible Preferred Stock                
Convertible Promissory Notes                
Number of preferred stock converted (in shares) | shares 1,851,814         (1,851,814)    
Exchange of Series A-E/A-1 for A-1/A-2 Preferred stock | shares 597,359   1,851,814          
Fair value of stock issued (in dollars)     $ 1,100,000          
Fair value of convertible preferred stock (in dollars per share) | $ / shares     $ 0.58          
Series A-2 Convertible Preferred Stock | Note Conversion Agreement                
Convertible Promissory Notes                
Exchange of Series A-E/A-1 for A-1/A-2 Preferred stock | shares       1,766,097        
Series A-2 Convertible Preferred Stock | Series A1 Converted To Series A2 Preferred Shares                
Convertible Promissory Notes                
Exchange of Series A-E/A-1 for A-1/A-2 Preferred stock | shares       85,717