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Stockholders' Equity - Summary of Warrant Activity (Details) - $ / shares
 6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Warrants outstanding [Roll Forward]        
Outstanding, beginning of period (in shares) 65,685,269 14,049 78  
Warrants issued (in shares)     14,256  
Warrants exercised (in shares) (7,898,853) (4,574,529) (246)  
Exchanged (in shares) (64,000)      
Warrants expired (in shares)   (9) (39)  
Outstanding, end of period (in shares) 57,722,416 65,685,269 14,049 78
Warrants, Exercise Price per Share [Roll Forward]        
Outstanding, (in dollars per share) $ 0.23 $ 0.22 $ 1,569 $ 910,000
Warrants, Weighted Average Exercise Price [Roll Forward]        
Outstanding, beginning of period (in dollars per share) 0.22 1,569 910,000  
Warrants issued (in dollars per share)     2,299  
Warrants exercised (in dollars per share) 0.01 1.79 4,221  
Warrants expired (in dollars per share)   19,712,000 845,250  
Outstanding, end of period (in dollars per share) $ 0.23 $ 0.22 $ 1,569 $ 910,000
Weighted average remaining life 5 years 2 months 26 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) $ 0.01 $ 0.01 $ 1,225 $ 281,750
Maximum [Member]        
Warrants, Exercise Price per Share [Roll Forward]        
Outstanding, (in dollars per share) $ 10.00 $ 10.00 $ 19,712,000 $ 19,712,000
February 2018 Warrants [Member]        
Warrants outstanding [Roll Forward]        
Outstanding, beginning of period (in shares) 200,000      
Warrants issued (in shares)   1,076,002    
Outstanding, end of period (in shares)   200,000    
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    
Short Term Convertible Notes Payable [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