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Stockholders' Equity - Summary of Warrant Activity (Details) - $ / shares
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Warrants outstanding [Roll Forward]    
Outstanding, beginning of period (in shares) 65,685,269  
Exercised (in shares) (4,119,500)  
Outstanding, end of period (in shares) 61,565,769 65,685,269
Warrants, Exercise Price per Share [Roll Forward]    
Outstanding, (in dollars per share) $ 0.23 $ 0.22
Warrants, Weighted Average Exercise Price [Roll Forward]    
Outstanding, beginning of period (in dollars per share) 0.22  
Exercised (in dollars per share) 0.01  
Outstanding, end of period (in dollars per share) $ 0.23 $ 0.22
Weighted average remaining life 5 years 5 months 26 days 5 years 9 months
Minimum [Member]    
Warrants, Exercise Price per Share [Roll Forward]    
Outstanding, (in dollars per share) $ 0.01 $ 0.01
Maximum [Member]    
Warrants, Exercise Price per Share [Roll Forward]    
Outstanding, (in dollars per share) $ 10.00 $ 10.00