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Stockholders' Equity - Summary of Warrant Activity (Details) - $ / shares
 9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Warrants outstanding [Roll Forward]        
Outstanding, beginning of period (in shares) 93,835 20 1  
Warrants issued (in shares) 1,001,995   21  
Warrants exercised (in shares) (11,285) (6,536) (1)  
Exchanged (in shares) (82,521)      
Warrants expired (in shares)   (1) (1)  
Outstanding, end of period (in shares) 1,002,024 93,835 20 1
Warrants, Weighted Average Exercise Price [Roll Forward]        
Outstanding, beginning of period (in dollars per share) $ 150.67 $ 4,868,205,366 $ 637,218,564  
Warrants issued (in dollars per share) 42.00   1,610,000  
Exchanged (in dollars per share) 170.31      
Warrants exercised (in dollars per share) 7.00 1,252 2,954,000  
Warrants expired (in dollars per share)   13,798,400,000 591,675,000  
Outstanding, end of period (in dollars per share) $ 42.00 $ 150.67 $ 4,868,205,366 $ 637,218,564
Weighted average remaining life 5 years 18 days 5 years 9 months 4 years 10 months 17 days 5 years 7 months 2 days
Minimum [Member]        
Warrants, Exercise Price per Share [Roll Forward]        
Outstanding, (in dollars per share) $ 7.00 $ 7.00 $ 857,500 $ 197,225,000
Maximum [Member]        
Warrants, Exercise Price per Share [Roll Forward]        
Outstanding, (in dollars per share) $ 42.00 $ 7,000 $ 13,798,400,000 $ 13,798,400,000
February 2018 Warrants [Member]        
Warrants outstanding [Roll Forward]        
Outstanding, beginning of period (in shares) 273      
Warrants issued (in shares)   1,538    
Outstanding, end of period (in shares)   273    
Warrants, Exercise Price per Share [Roll Forward]        
Outstanding, (in dollars per share)   $ 7,000    
Warrants, Weighted Average Exercise Price [Roll Forward]        
Warrants issued (in dollars per share)   $ 6,531    
Convertible Notes [Member]        
Warrants outstanding [Roll Forward]        
Warrants issued (in shares)   98,814    
Warrants, Weighted Average Exercise Price [Roll Forward]        
Warrants issued (in dollars per share)   $ 126