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Stockholders' Equity - Summary of Warrant Activity (Details) - $ / shares
 9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Warrants outstanding [Roll Forward]    
Outstanding, beginning of period (in shares) 14,049  
Exercised (in shares) (74,010)  
Outstanding, end of period (in shares) 70,185,797 14,049
Warrants, Exercise Price per Share [Roll Forward]    
Outstanding, (in dollars per share) $ 2.85 $ 13,942.79
Warrants, Weighted Average Exercise Price [Roll Forward]    
Outstanding, beginning of period (in dollars per share) 13,942.79  
Exercised (in dollars per share) 0.50  
Outstanding, end of period (in dollars per share) $ 2.85 $ 13,942.79
Weighted average remaining life 6 years 4 years 10 months 17 days
Minimum [Member]    
Warrants, Exercise Price per Share [Roll Forward]    
Outstanding, (in dollars per share) $ 0.01 $ 1,225
Maximum [Member]    
Warrants, Exercise Price per Share [Roll Forward]    
Outstanding, (in dollars per share) $ 19,712,000 $ 19,712,000
February 2018 Warrants [Member]    
Warrants outstanding [Roll Forward]    
Outstanding, beginning of period (in shares)    
Warrants issued (in shares) 1,076,002  
Outstanding, end of period (in shares) 1,000,000  
Warrants, Exercise Price per Share [Roll Forward]    
Outstanding, (in dollars per share) $ 10.00  
Warrants, Weighted Average Exercise Price [Roll Forward]    
Warrants issued (in dollars per share) $ 9.33  
Convertible Notes [Member]    
Warrants outstanding [Roll Forward]    
Warrants issued (in shares) 69,169,756  
Warrants, Weighted Average Exercise Price [Roll Forward]    
Warrants issued (in dollars per share) $ 0.18